High Conservation Value Research Articles

Range reshuffling: Climate change, invasive species, and the case of Nothofagus forests in Aotearoa New Zealand

AbstractAimThe impact of climate change on forest biodiversity and ecosystem services will be partly determined by the relative fortunes of invasive and native forest trees under future conditions. Aotearoa New Zealand has high conservation value native forests and one of the world's worst invasive tree problems. We assess the relative effects of habitat redistribution on native Nothofagus and invasive conifer (Pinaceae) species in New Zealand as a case study on the compounding impacts of climate change and tree invasions.LocationAotearoa New Zealand.MethodsWe use species distribution models (SDMs) to predict the current and future distribution of habitat for five native Nothofagus species and 13 invasive conifer species under two 2070 climate scenarios. We calculate habitat loss/gain for all species and examine overlap between the invasive and native species now and in future.ResultsMost species will lose habitat overall. The native species saw large changes in the distribution of habitat with extensive losses in North Island and gains mostly in South Island. Concerningly, we found that most new habitat for Nothofagus was also suitable for at least one invasive species. However, there were refugia for the native species in the wetter parts of the climate space.Main ConclusionIf the predicted changes in habitat distribution translate to shifts in forest distribution, it would cause widespread ecological disruption. We discuss how acclimation, adaptation and biotic interactions may prevent/delay some changes. But we also highlight that the poor establishment capacity of Nothofagus, and the contrasting ability of the conifers to invade, will present persistent conservation challenges in areas of both new habitat and forest retreat. Pinaceae are problematic invaders globally, and our results highlight that control of invasions and active native forest restoration will likely be key to managing forest biodiversity under future climates.

Jurisdictional approaches to High Conservation Value area designation using regulatory instruments: an Indonesian pilot project

Agricultural expansion is the primary driver of tropical deforestation and ecological degradation. Certification schemes for sustainable agricultural supply chains, such that of the Roundtable on Sustainable Palm Oil (RSPO), seek to address this issue by identifying and protecting High Conservation Value (HCV) areas within concessions. Although RSPO certification of individual concessions has been beneficial, it has had limited efficacy in arresting systemic ecological degradation at larger scales. In response, certification at a regional, ‘jurisdictional’ scale concordant with local environmental regulation has been proposed as an alternative to conventional, piecemeal certification. Jurisdictional certification schemes require alignment with local legislation to ensure integration with governmental environmental and land-use planning; yet, questions of which legislation, and at which level of government, have remained unaddressed. Here, we report on a pilot jurisdictional RSPO certification scheme implemented by an Indonesian district, based on environmental carrying capacity assessments (ECCA) as legislated by the district government. Using the ECCA, we identified likely HCV areas across the district and considered their distributions with respect to three factors of feasible HCV management: (a) similarity with alternative HCV areas identified by a conventional HCV Screening method, (b) sensitivity to aspects of underlying legislation, and (c) scope for unilateral district-wide management. Likely HCV areas were generally similar between the ECCA and HCV Screening method, as each set spanned ∼90% of the district. However, higher-confidence HCV areas according to the ECCA were much less extensive, at 51% of the district, and uniquely extensive across oil-palm concessions. HCV area designation was highly sensitive to the legislated parameters of the ECCA, namely, the selection and estimation of key ecosystem services. Potentially, subtle variations to ECCA implementation, such as those proposed by agro-industrial lobbyists, would significantly affect jurisdictional HCV designations. Finally, some three-quarters of all HCV areas and higher-confidence HCV areas designated by the ECCA fell outside of the exclusive administrative authority of the district government, being confined to agricultural zones. In politically-decentralised Indonesia, jurisdictional HCV area management would therefore be narrowly confined to agricultural areas, or cooperation between district, provincial, and central governments would be essential to the protection of HCV areas generally across districts.

Extending the conservation impact of great ape research: Flagship species sites facilitate biodiversity assessments and land preservation.

To inform regional conservation planning, we assessed mammalian and avian biodiversity in the Djéké Triangle, which is an intact forest with long-term research and tourism focused on western lowland gorillas (Gorilla gorilla gorilla). This critical region serves as a conservation conduit between the Nouabalé-Ndoki National Park (NNNP) in the Republic of Congo and the Dzanga-Ndoki National Park in Central African Republic. Wildlife inventories were conducted to determine if biodiversity in the Djéké Triangle (initially part of a logging concession) was equivalent to the NNNP. Camera traps (CTs) were deployed to estimate species richness, relative abundance, naïve occupancy, and activity patterns of medium-to-large species in mixed species and monodominant Gilbertiodendron forests that comprise the majority of regional terra firma. Species inventories were collected from CTs positioned on a grid and at termite nests throughout the Djéké Triangle and compared to CTs placed in the Goualougo Triangle located within the NNNP. From 10,534 camera days at 65 locations, we identified 34 mammal and 16 bird species. Allaying concerns of wildlife depletion, metrics of species richness in the Djéké Triangle surpassed those of the Goualougo Triangle. Many species were observed to occur across habitats, while others showed habitat specificity, with termite mounds indicated as an important microhabitat feature. Our comparisons of animal activity budgets in different habitat types provide important reference information for other populations and contexts. In conclusion, this study provided empirical evidence of the high conservation value of this region that contributed to increasing the protected status of the Djéké Triangle.

An in-depth characterization of the Habitat of Thelypteris interrupta in South Korea

PurposeThe Deonggae coast on Jeju Island is a unique habitat that has not yet been studied from an ecological management or conservation perspective, despite its importance as the northernmost habitat of subtropical plants in Asia and the sole habitat of an endangered fern, Thelypteris interrupta, in Korea. To provide insights into this habitat’s systematic management, we comprehensively characterized its abiotic and biotic components.MethodsOur study found two distinct plant communities (Persicaria japonica-Thelypteris interrupta and Thelypteris interrupta-Phragmites australis), driven by their respective microhabitats and influenced by soil inundation frequency, water depth, and salinity. We examined the phytosociological similarities and habitat characteristics of these two communities.ResultsThelypteris interrupta could be distributed in the northernmost part of the Deonggae coast due to its greater heat preference. However, this limits its spread toward polar regions. We suggested minimizing the transformation of wetlands into terrestrial habitats by reducing the introduction of external soils and establishing ecological continuity with neighboring ecosystems while educating visitors about the area’s ecology as two habitat conservation practices.ConclusionThe Deonggae coast is a natural wetland with a high conservation value as a habitat for endangered wildlife and a refuge for opportunistic species under the influence of climate change.

Biodiversity tourism: a concept for oil palm villages sustainable revitalization

Rural resilience has become an interestingly debated topic in recent years, with scholars offering opposing viewpoints. Studies have suggested that rural resilience is arguably better than that of urban. Especially in the context where the rural is supported economically by the existence of some businesses such as oil palm plantations. However, certain negative images are still linked to oil palm plantations, in particular with respect to biodiversity loss, despite many of the plantations having areas of high conservation value (HCV). HCVs are known to possess and attract wild species such as elephants, orangutans, and other primates, meaning that ecologically, HCV represents a significant added value of the oil palm plantations. This conceptual paper aims to contribute to this debate by envisioning feasible futures of biodiversity tourism for oil palm village revitalization by utilizing the biodiversity richness of HCVs. This study includes a conceptual model of biodiversity tourism for oil palm village revitalization that was developed using a causal loop diagram approach. The causal loop diagram depicts an overall understanding and describes the village system’s complexity. Positive and negative loops that form the reinforcement and balance circles represent the connection between the input and output variables. A systematic literature review and interviews with pilot village stakeholders were used to collect data. The potential of such a vision is discussed before finally concluding with an insight into the future of biodiversity tourism for oil palm village revitalization. This paper recognizes that biodiversity tourism for oil palm village revitalization can be done sustainably by presenting it as a complex system with its subsystems. It shows that oil palm villages and biodiversity are interdependent and interconnected. Moreover, biodiversity tourism can be recognized as a vehicle to promote the positive impacts of oil palm plantations in enhancing knowledge and awareness of biodiversity conservation beyond existing economic value.

The roles of high conservation value area to support biodiversity conservation in Indonesia

Oil palm plantations are often considered as one of the causes of the decline in biodiversity. Conversion of forest land to oil palm is the main factor. However, legally, land conversion can be carried out and oil palm plantation companies have also protected areas that have high conservation value, including important animal habitats. The purpose of this study is to assess the role of high conservation value areas in the conservation of biodiversity. The study was conducted on several oil palm plantations in Indonesia by conducting a literature review of high conservation value documents on several oil palm plantation companies. High conservation value areas in oil palm plantations are determined based on the presence of endangered and protected animals such as proboscis monkeys and orangutans. With the stipulation of the area as a HCV area, the presence of these animals becomes more concerned because the company has the responsibility to monitor the presence of these animals. In addition, the company also conducts socialization to the community and workers to take care of these animals. The existence of the HCV area also indirectly supports the government’s program in this case is the establishment of an Essential Ecosystem Area that functions to protect important animals outside the conservation area.

Potential and diversity of bird species in various land covers in PT BSM, South Sumatera

Birds have an important role in the ecosystem, including as environmental indicators, natural pest controls, and tourist attractions. The existence of birds in a habitat type certainly plays an important role both ecologically and economically. Research that shows the ecological and economic potential of bird species in oil palm plantations is still not widely done. Therefore, research is needed to be able to show the potential and variation of bird species diversity in oil palm plantations. This research was conducted at PT Bina Sawit Makmur (PT BSM) on Desember 2019. The method used was a line transect that was carried out on five different land covers simultaneously. The results showed that a total of 28 species were found. High Conservation Value (HCV) land cover has the highest diversity, richness, and species similarity index values. The potential possessed by bird species in various types of land cover includes natural pest control, economic value animals, and environmental indicators.

Discordant spatiotemporal dynamics of functional and phylogenetic diversity of rotiferan communities exposed to aquaculture effluent.

The growth of the human population brought about the global intensification of aquacultural production, and aquaculture became the fastest growing animal husbandry sector. Effluent from aquaculture is an anthropogenic environmental burden, containing organic matter, nutrients and suspended solids that affect water quality especially in the water bodies of high biodiversity and conservation value. Water quality assessment often relies on bioindicators, analysing changes in taxonomic diversity of various freshwater organismal groups. Stepping beyond taxon diversity, we used functional and phylogenetic diversities of rotifers to identify factors affecting their community organization in response to an aquaculture effluent gradient in the largest oxbow lake in the Carpathian Basin, Hungary. Sampling was carried out three times per season at five points along a 3.5 km section of the oxbow lake, including the point of effluent inflow. We used eight traits to evaluate functional diversity: body size, trophi type, feeding mode, protection type, body wall type, corona type, habitat preference and tolerance level. Functional and phylogenetic distances among the 24 species identified indicated trait conservatism. Rotiferan diversity increased with increasing distance from the point of influx in spring and summer. Among the factors affecting community organization in spring and summer, we find examples of environmental filtering, while in autumn the role of biotic interaction is more frequent. Under nutrient-rich conditions in spring and summer, organisms belonging to the same functional group were dominant, whereas under oligotrophic conditions, more diverse but less abundant groups were present. Considering functional and phylogenetic traits allowed us to identify organising forces of rotifer communities in the largest oxbow lake of the Hungarian Lowland.

The role of high conservation value areas to maintaining ecological balance in oil palm plantations PT. Waimusi Agroindah, South Sumatera

Currently, oil palm plantations must carry out environmentally friendly plantation activities, one of which is by maintaining the biodiversity in or around the plantation area. Biodiversity can also reduce pest attacks that can reduce oil palm productivity. The research activities were carried out at PT. Waimusi Agroindah by conducting an inventory of plant, mammal, and bird species in HCV areas and oil palm plantations (young, medium, and mature palms). The results of the research in the HCV area showed that there were 4 types of trees, 10 types of poles, 7 types of saplings, 4 understorey plants and seedlings, 4 types of mammals, and 34 species of birds. Within the HCV area, three species of mammals protected by the government were found, namely the silvery lutung (Trachypithecus cristatus) as many as 3 individuals, and three species of birds, namely Haliastur indus, Elanus caerulaus, and Anhinga melanogaster. In the oil palm plantation area, only understorey stands were found, but various types of mammals and birds were found. The number of species of mammals and birds found in HCV areas is higher than in oil palm plantations. The number of vegetation types in the HCV area is more diverse so that it can be used as a place for wildlife to live, both for forage plants and nests. This shows the need for HCV areas in biodiversity conservation and as an ecological balancer in oil palm plantation areas.

Beetle mania: Understanding pond aquatic beetles diversity patterns through a multiple-facet approach

Ecological studies searching for drivers of biodiversity variation have frequently focused on taxonomic richness. However, more aspects of biodiversity, namely diversity facets can be considered to properly assess biotic-environment relationships. Here, we explore the environmental factors that could control the four biodiversity facets of aquatic Coleoptera from 93 regionally sampled Patagonian ponds. We also explore which are the ponds with high diversity values of all facets to prioritize them with a high conservation value. We fitted generalized additive models (GAM) to test relationships among environment (i.e., local and climatic variables) and aquatic beetles diversity facets (i.e., richness (SD), functional diversity (FD), phylogenetic diversity (PD), and local contribution to local beta diversity (LCBD). Climatic drivers were the most important predictors of beetle diversity facets, which exhibited linear and nonlinear responses. Thus, ponds from warmer Patagonia exhibited the highest values of SD and PD, whereas LCBD also peaked on colder sites suggesting that ponds under extreme temperatures sustain unique beetle assemblages. Moreover, ponds located in areas with higher precipitation variability exhibit the highest values of LCBD (i.e., unique assemblages). This result in addition to arid conditions in Patagonia prevailing since 16 m.y.a made us think that Patagonian beetle pond-dwellers are basally adapted to aridity. We calculated an index that summarizes the four facets patterns, to assign high conservation value to those ponds with higher index values. The relative importance of each facet varies from pond to pond. Hence, this multifaceteded approach not only allows us to identify priority areas for biodiversity conservation but also focuses on the importance of including multiple facets to understand biodiversity spatial patterns.

Camera trap surveys reveal a wildlife haven: mammal communities in a tropical forest adjacent to a coal mining landscape in India

Having knowledge of the status and distribution of species in a specific geographic area is crucial for creating efficient conservation strategies. In this study, we evaluated the abundance and diversity of medium to large sized mammals in a tropical forest in India that has been greatly impacted by coal mining. Using camera traps between June 2018 and December 2018, we recorded 27 mammal species over 3432 trap-nights in 81 camera trap stations within the study area. The photo-captured species included both common and high conservation value threatened species, such as tiger Panthera tigris, leopard P. pardus, sloth bear Melursus ursinus, Asian elephant Elephas maximus, Gaur Bos gaurus, Indian pangolin Manis crassicaudata, and four-horned antelope Tetracerus quadricornis. Wild boar Sus scrofa was found to be the most frequently photo-captured and widespread species. Our study provides valuable data on the species inventory and the relative abundance of species in the area, highlighting its significance for mammal conservation. It also emphasizes the need for effective conservation management strategies to protect the remaining forest fragments containing high diversity of mammals, including several threatened species in India.

A new bioassessment multimetric index (BECOME) and diagnostic tool (BECOMEd) for small standing waters

Small shallow lakes and ponds (SSWs) have high conservation value and support numerous ecosystem services. However, these small ecosystems face many threats, including eutrophication and internal biotic pressures like Cyprinidae or exotic bioturbators crayfish, which tend to shift biodiverse SSWs to a turbid state dominated by phytoplankton unfitted to numerous usages, and compromise the effectiveness of their restoration. The ecological quality of SSWs and the efficiency of their management still remain poorly evaluated because of the lack of adapted tools. To fill this gap, we propose a new multimetric index (BECOME) and a diagnostic tool (BECOMEd) both based on macrophyte and invertebrate communities. BECOME exhibits a high sensitivity to the impact of surrounding crops, urbanization and fertilized meadows, morphological alterations, and various internal biotic sources of alterations, in a wide variety of geological and climatic contexts. BECOME is especially innovative, because taking into account internal biotic sources of pressures neglected by most of the existing biological WFD-compliant indices for European lakes and ponds, despite their importance in SSW threats. BECOMEd allows to identify the major alteration sources and estimates their relative contribution to SSW degradation, helping managers to prioritize actions or to evaluate their effectiveness. The statistical design applied for the index construction has been fitted to develop biological index for ecosystems influenced by a wide amplitude of numerous environmental conditions. This design could be easily applied elsewhere in the world, for SSWs but also for other types of ecosystems.

Role of microhabitats in shaping diversity of periphytic diatom assemblages

Diverse macrovegetation can provide heterogeneous habitats for benthic diatoms. The removal of macrophytes as direct plant control, however, can be considered as a threat, which can even lead to remarkable microhabitat alterations. Lake Tisza (Hungary) has a high nature conservation value, but it is also an important recreation centre, which is why very delicate water management is necessary including vegetation thinning. Here, we studied the importance of microhabitat heterogeneity (emergent, submerged and floating macrophytes) in maintaining diverse periphytic diatom assemblages. We hypothesized that the substrate type has greater influencing role on the composition and diversity of diatoms than the lake heterogeneity related to basins. We also assumed that floating vegetation hosts the most different and least diverse diatom assemblages. Our results mostly proved these hypotheses. Heterogeneous assemblages were formed on the different substrates (support hypothesis), however, the basin level differences were also detected (reject hypothesis). Our results also highlighted, that macrophyte species with lesser morphological complexity hosted the least diverse periphytic assemblages (support hypothesis). However, many unique and red list taxa were found on floating plants (reject hypothesis). These findings emphasize the key role of microhabitat complexity in maintaining diverse and healthy functioning of microbial assemblages in a multi-purpose reservoir.

Prioritizing global tall forests toward the 30 × 30 goals.

The Global Deal for Nature sets an ambitious goal to protect 30% of Earth's land and ocean by 2030. The 30 × 30 initiative is a way to allocate conservation resources and extend protection to conserve vulnerable and underprotected ecosystems while reducing carbon emissions to combat climate change. However, most prioritization methods for identifying high-value conservation areas are based on thematic attributes and do not consider vertical habitat structure. Global tall forests represent a rare vertical habitat structure that harbors high species richness in various taxonomic groups and is associated with large amounts of aboveground biomass. Global tall forests should be prioritized when planning global protected areas toward reaching the 30 × 30 goals. We examined the spatial distribution of global tall forests based on the Global Canopy Height 2020 product. We defined global tall forests as areas with the average canopy height above 3 thresholds (20, 25, and 30m). We quantified the spatial distribution and protection level of global tall forests in high-protection zones, where the 30 × 30 goals are being met or are within reach, and low-protection zones, where there is a low chance of reaching 30 × 30 goals. We quantified the protection level by computing the percentage of global tall forest area protected based on the 2017 World Database on Protected Areas. We also determined the global extent and protection level of undisturbed, mature, tall forests based on the 2020 Global Intact Forest Landscapes mask. In most cases, the percentage of protection decreased as forest height reached the top strata. In the low-protection zones, <30% of forests were protected in almost all tall forest strata. In countries such as Brazil, tall forests had a higher percentage of protection (consistently >30%) compared to forests of lower height, presenting a more effective conservation model than in countries such as the United States, where forest protection was almost uniformly <30% across height strata. Our results show an urgent need to target forest conservation in the greatest height strata, particularly in high-protection areas, where most global tall forests are found. Vegetation vertical structure can inform the decision-making process toward the 30 × 30 goals because it can be used to identify areas of high conservation value for biodiversity protection which also contribute to carbon sequestration.

High Megabenthic Complexity and Vulnerability of a Mesophotic Rocky Shoal Support Its Inclusion in a Mediterranean MPA

The deep shoal of Punta del Faro (Ligurian Sea, Mediterranean Sea) is a mesophotic rocky elevation hosting complex animal forests threatened by fishing activities. To identify appropriate conservation measures and set a reference example for similar cases, we present a detailed characterization of its megabenthic communities and a quantification of the fishing pressure. The results highlight the high natural value of the area, presenting high biodiversity (111 megabenthic and demersal species) and diverse types of animal forest, predominantly dominated by cnidarians. The tridimensional seascape is among the most complex in the eastern Ligurian Sea, but the long-term evaluation of its environmental status suggested consistent affects due to the high abundance of lost fishing gear (0.65 items m−2) directly entangled with structuring cnidarians. The artisanal and recreational fishing pressure are currently moderate. However, the use of bottom-contact fishing gear causes significant modifications to the seafloor’s integrity. This study emphasizes the high conservation value and vulnerability of the shoal, highlighting the importance of its protection through its inclusion in the Portofino MPA, whose external perimeter is 200 m from the study area. A critical discussion of the advantages and disadvantages is provided with a map of the possible extension of the MPA boundaries.

Mountain passes are higher at low latitudes for madicolous insect communities of the Neotropical region

AbstractAimTo test whether spatial turnover patterns of mountain madicolous insect communities in the Southern Hemisphere support the ‘mountain passes are higher in the Tropic’ hypothesis (MPHT). To do this, we compared madicolous communities in the Amazon Mountains (equator) and the Atlantic Forest Mountains (23°S).LocationBrazil.MethodsWe characterized madicolous insect communities in two elevational gradients between 90 to 3000 m a.s.l. separated by 23° of latitude, totalling 108 sampling sites. Since the MPHT predicts a more intense turnover along elevational gradients at lower latitudes than at higher latitudes, we evaluated beta diversity in the Amazon mountains, at the equator, and in the Atlantic Forest mountains, in the subtropical region. We quantified multiple‐site abundance‐based dissimilarity to assess whether beta diversity was different between both regions. We also performed constrained ordination (db‐RDA) analyses to assess whether community dissimilarity (balanced variation in abundances) was uniquely or jointly explained by environmental, spatial and/or elevational predictors. Additionally, we independently assessed the relationship between community dissimilarity and altitudinal difference in each region and tested for differences in model parameters between regions.ResultsAlthough we found high species turnover in both regions, the community variation explained by environmental factors and altitude was higher in the Amazon than in the Atlantic Forest, as evidenced by db‐RDA and altitudinal difference models. In general, communities were remarkably constrained by spatial predictors, which result from low dispersion capacity of most madicolous insects and low connectivity of madicolous systems. Consequently, the composition of madicolous insects notably diverged between regions, highlighting the complementarity and high conservation value of both systems.Main ConclusionsOur results indicate that the MPHT explains, at the community level, the differences between low‐ and high‐latitude mountain systems in community turnover along elevational gradients, even within a relatively short latitudinal distance in the Southern Hemisphere.

Zooplankton size-structure dynamics of a lowland tropical floodplain lake

Floodplains are highly complex ecosystems representing high biodiversity and conservation values, but they are also one of the world’s most threatened ecosystems due to extensive development and anthropogenic activities. Lake Tempe is a lowland riverine floodplain lake in Sulawesi Island, Indonesia, that is subject to multiple stressors such as flow alteration, eutrophication and invasive species. In this study, the dynamics of the zooplankton community size structure was investigated in Lake Tempe. Five size-based metrics, including zooplankton mean body size, total abundance, total, biomass, and normalised biomass size spectra (NBSS) slope and intercept were assessed from net-sampled zooplankton collected monthly from March to December 2016, and the role of environmental variables in shaping these size-based metrics were also examined. Zooplankton community size structure is a useful metric as it is less labour intensive than traditional approaches, provides more data accuracy and does not require highly specialised taxonomic expertise. The zooplankton community in Lake Tempe was characterised by high density of small-sized zooplankton with an average mean body size < 500 µm equivalent spherical diameter. While the zooplankton density was characterised by the dominance of the size class 300–700 µm, there was evidence of a significant contribution of the size > 700 µm towards total biomass. Seasonal hydrological regimes, water temperature and eutrophication parameters, as indicated by total phosphorus and chlorophyll-a concentration, had a significant role in driving the variability of zooplankton community size structure in this system. The results of this study are not only a significant step in providing critical baseline information on the zooplankton assemblage of Lake Tempe, but is also a significant contribution to the overall understanding of zooplankton community structure in tropical lakes, and will aid in improving lake management plans in these regions.

Close-kin mark-recapture informs critically endangered terrestrial mammal status

Reliable information on population size is fundamental to the management of threatened species. For wild species, mark-recapture methods are a cornerstone of abundance estimation. Here, we show the first application of the close-kin mark-recapture (CKMR) method to a terrestrial species of high conservation value; the Christmas Island flying-fox (CIFF). The CIFF is the island's last remaining native terrestrial mammal and was recently listed as critically endangered. CKMR is a powerful tool for estimating the demographic parameters central to CIFF management and circumvents the complications arising from the species’ cryptic nature, mobility, and difficult-to-survey habitat. To this end, we used genetic data from 450 CIFFs captured between 2015 and 2019 to detect kin pairs. We implemented a novel CKMR model that estimates sex-specific abundance, trend, and mortality and accommodates observations from the kin-pair distribution of male reproductive skew and mate persistence. CKMR estimated CIFF total adult female abundance to be approximately 2050 individuals (95% CI (950, 4300)). We showed that on average only 23% of the adult male population contributed to annual reproduction and strong evidence for between-year mate fidelity, an observation not previously quantified for a Pteropus species in the wild. Critically, our population estimates provide the most robust understanding of the status of this critically endangered population, informing immediate and future conservation initiatives.

Stand stage affects wild bee communities in working pine forests

Wild bees provide critical pollination services to both crops and native forest plants. Evidence suggests that wild bees are declining due to factors such as habitat loss, disease, pesticide use, and climate change. Privately owned, working loblolly pine (Pinus taeda L.) forest landscapes cover a large area in the southeastern U.S. and may be important for wild bee conservation. However, there is little research on wild bees in private, working forests. Hence, our research objectives were to compare wild bee populations and communities among different stages within working, loblolly pine forest landscapes and assess stand structure and composition effects on wild bees. We sampled bees and forest attributes in four stages [0–3 years (recently established), 4–7 years (pre-thinned, closing canopy), 8–13 years (pre-thinned, closed canopy), and 14–20 years (post-thinned)] of privately owned, working pine forests in the Southeastern Plains Ecoregion of Georgia. We collected 5,933 bees from 88 species in two years. Wild bees were 2–5 times more abundant in recently established stages, and more diverse in recently established and post-thinned stages. Functional dispersion, a measure of beta diversity, was also greater in recently established and post-thinned stages. Canopy openness, percent of plants flowering, and percent cover of minimally decayed woody debris were important variables driving the bee community composition in recently established stages. Number of snags and litter layer depth were important variables driving the bee community composition in older stages with a closing or closed canopy. Working pine forests support a diverse community of wild bees and have high conservation value for these pollinators. Overall, wild bees appear to benefit from various stand stages, especially open canopy stands with a diverse structure. Promoting and maintaining open canopy conditions in managed pine landscapes may assist with conserving wild bee communities in this region. This can be achieved by planting trees at wider spacing, thinning as early as possible, and supporting fewer trees per hectare or a lower basal area.

Past climate-driven range shifts structuring intraspecific biodiversity levels of the giant kelp (Macrocystis pyrifera) at global scales

The paradigm of past climate-driven range shifts structuring the distribution of marine intraspecific biodiversity lacks replication in biological models exposed to comparable limiting conditions in independent regions. This may lead to confounding effects unlinked to climate drivers. We aim to fill in this gap by asking whether the global distribution of intraspecific biodiversity of giant kelp (Macrocystis pyrifera) is explained by past climate changes occurring across the two hemispheres. We compared the species’ population genetic diversity and structure inferred with microsatellite markers, with range shifts and long-term refugial regions predicted with species distribution modelling (SDM) from the last glacial maximum (LGM) to the present. The broad antitropical distribution of Macrocystis pyrifera is composed by six significantly differentiated genetic groups, for which current genetic diversity levels match the expectations of past climate changes. Range shifts from the LGM to the present structured low latitude refugial regions where genetic relics with higher and unique diversity were found (particularly in the Channel Islands of California and in Peru), while post-glacial expansions following ~ 40% range contraction explained extensive regions with homogenous reduced diversity. The estimated effect of past climate-driven range shifts was comparable between hemispheres, largely demonstrating that the distribution of intraspecific marine biodiversity can be structured by comparable evolutionary forces across the global ocean. Additionally, the differentiation and endemicity of regional genetic groups, confers high conservation value to these localized intraspecific biodiversity hotspots of giant kelp forests.