Habitat Conditions Research Articles

Drivers of nutrient intakes from fisheries in French Polynesia

ABSTRACT Small-scale fisheries provide nutrients to hundreds of millions of people worldwide, with yields dependent on the condition of marine habitats such as coral reefs. Small-scale fisheries are a particularly important food source in societies with nutrient deficiencies and where unhealthy food alternatives are widely available. Using data from coral reef surveys around two islands in French Polynesia (Moorea and Raiatea), we show how the availability of nutrients to fisheries changed in relation to the condition of coral habitat. Fish biomass and nutrient availability were highest when coral cover was low around both islands, driven predominantly by abundant herbivorous reef fish. We also investigated the importance of fish in people’s diets, to determine if fish consumption was aligned with available fisheries resources on local reefs and if nutrient intakes from fish could be explained by people’s socioeconomic background. People ate a higher diversity of reef fish in Raiatea, however nutrient intakes from fish were higher in Moorea. Most people ate more fish than meat on both islands, however fish consumption declined over generations. People from fishing households had higher nutrient intakes from reef and pelagic fish, and people from farming households had higher intakes from reef fish. Preference for eating reef fish over pelagic fish was also associated with higher total nutrient intakes. Promoting traditional diets rich in fish could be key to meeting people’s nutritional needs in French Polynesia while reducing diet-related health issues linked to the overconsumption of fat. French and Tahitian versions of the are available in Supplementary Material.

Taxonomic Implication of Conducting Elements in the Acrocarpous Mosses

Present study deals with the structure and development of conducting elements in the nine orders of acrocarpous mosses. The significance of conducting tissues in mosses in relation to their habitat conditions, growth forms and leaf cell patterns has been discussed. Features of cells in different portions of the stem and the laminal cell patterns and costa are taken into consideration. Although water-conducting cells are unspecialized in mosses, yet the study shows that they seem to play a vital role in the conduction and provide additional criteria for the distinction of taxa. Four categories have been determined as (i) Acrocarpous mosses with a distinct thick-walled conducting strand (6-7 layered) as hydrome which is surrounded by patches of leptoids. Cortex consists of thick walled cells (6-10 layered). Costa has stereidal cells and well developed conducting elements in leaf, example Polytrichum (ii) Acrocarps with thick-walled, narrow, elongated conducting strand (4-5 layered), cells angular in the cortex (6-8 layered). Leaf cells are rectangular, irregular and porous with incrassate walls, example Dicranum (iii) Acrocarps with conducting tissue (2-5 layered) stereidal, thick walled or thin walled varying in the course of development. Leaf cells are mutipapillate, rounded-quadrate, costa is present, examples Hyophila, Philonotis and (iv) Epiphytic pleurocarps with conducting cells rudimentary, thickened, scattered (2-4 layers) and parenchymatous, cortical cells (2-3 layered) thick walled. Leaf cells are small, rounded or linear and papillate, costa may be present or absent, example Leucodon . The study would constitute a formidable task, especially if intraspecific structural variability is considered. It serves a model system in the eco-physiological aspects.

Diversity and Ecological Assessment of Grasslands Habitat Types: A Case Study in the Calabria Region (Southern Italy)

Grasslands differ in many types depending on the diversity of climatic conditions and substrates. Due to the great wealth of species found in semi-natural grasslands, they conserve an essential part of the biodiversity of the European Union (EEC 43/92), defined as habitats of community interest. Using the region of Calabria (southern Italy) as a case study, this study aims to evaluate how species assemblages and a set of indicators applied to them can be used to analyse and characterize the diversity, ecological features and conservation status of grassland habitats. Vegetation analysis was carried out using the phytosociological method, and habitat ecological characteristics were defined by Ellenberg’s ecological indicator adapted to the Italian flora. Multivariate analysis of the surveys by means of cluster analysis and Principal Components Analysis (PCA) made it possible to define eight habitat groups according to EEC Directive 43/92: 6110 Rocky or basophilous calcareous grasslands of the Alysso-Sedion albi, 6170 Alpine and subalpine calcareous grasslands, 6220*a Pseudo-steppe with grasses and annuals of the Thero-Brachypodietea dominated by a Lygeum spartum, 6220*b Pseudo-steppe with grasses and annuals of the Thero-Brachypodietea dominated by Hyparrhenia hirta, 6210* Semi-natural dry grasslands and scrub facies on calcareous substrates (Festuco-Bromometalia) (*important orchid sites), 6230* Species-rich Nardus grasslands, on siliceous substrates in mountain areas (and submountain areas, in Continental Europe), 6410 Molinia meadows on calcareous, peaty or clayey-siltladen soils (Molinion caeruleae), 6420 Mediterranean tall humid herb grasslands of the Molinio-Holoschoenion, 6430 Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels. Temperature (T) and oisture (U) are the most statistically significant ecological factors in differentiating different habitat types. Analysis of diversity, assessed through Shannon and Evenness indices, showed that it is strongly correlated with habitat diversity as soil moisture increases. The study of ecological characteristics, correlated with biodiversity indices, helps to characterize grassland habitats, providing guidance for the implementation of active conservation policies for these habitats.

Further Contribution to the Flora of the Karimnagar District of Andhra Pradesh

The Karimnagar District lies in the Telangana Region of Andhra Pradesh (18°-19°10' N ; 78°30'-80°20'E). It was recently surveyed with the objective of exploring the possibility of exploiting non agricultural plants of economic value. The survey and collection was done mainly at Mahadevpur, Nimmagodem and Manthani Ranges of the District. The present paper records those taxa which are found as additions to the flora of Karimnagar. The district lies within the tropical deciduous belt which occupies a larger part of the peninsular India. The forests abound in teak mixed with deciduous trees of a number of species, the preponderance of which depends on soil and habitat conditions.

Reference ecosystem construction and adaptive restoration effect evaluation: A case study of a small watershed in the loess hilly region

AbstractThe loess hilly region is one of the most fragile areas in China. Many ecological restoration projects in this region are equivalent to simple afforestation and grass planting, with large investment and low benefits. Based on the concept of reference ecosystem, this study uses remote sensing data and vegetation community survey of Wanhuigou catchment, and applies methods such as redundancy analysis and GeoDetector to explore the characteristics of topography, soil, and vegetation of reference ecosystem, so as to provide restoration standards for damaged or degraded ecosystems in a small watershed. Thirteen typical and representative areas are selected to evaluate the degree of ecosystem damage and resilience, and divided into four categories according to the evaluation results and characteristics of ecosystems. Corresponding restoration measures such as protection and conservation, natural restoration, auxiliary regeneration, and ecological reconstruction are adopted for ecosystems under different scenarios with reference ecosystems as the target, and the effectiveness of implementation is assessed. The results show that the combination conditions of elevation and slope have a very important influence on the distribution of ecosystems. In the process of ecological restoration, it is necessary to deeply grasp the characteristics of soil and species diversity within the same community and among different communities, as well as their interrelationships. Adaptive restoration measures for ecosystems in different situations are conducive to the sustainability and effectiveness of ecosystem restoration. Given the complexity and diversity of habitat conditions and plant community types in Wanhuigou catchment, the results have certain universality, which can provide reference for the comprehensive management of other small watersheds in the loess hilly region, so as to achieve sustainable construction and restoration of ecosystems as well as harmonious development between humans and nature.

Seasonal Effects on Health Status and Parasitological Traits of an Invasive Minnow in Iberian Waters.

Biological invasions are of special conservation concern in the Iberian Peninsula and other regions with high levels of endemism. Environmental variability, such as the seasonal fluctuations of Mediterranean streams, is a key factor that affects the spread of aquatic species in novel habitats. Fish parasites have a great potential to reflect such changes in the habitat features of freshwater ecosystems. The aim of this study consisted of seasonally analysing the health status and parasitological traits of non-native fish in Iberian waters. In particular, a strongly invasive population of Languedoc minnow Phoxinus septimaniae (leuciscid species native to south-east France) was assessed in Tordera Stream (north-eastern Iberian Peninsula, Mediterranean conditions). Fish were sampled in April, July, and October 2023 by electrofishing. Health status (external/internal organs) was significantly better in autumn (HAI = 28.8) than spring (HAI = 35.6). Life-cycle complexity was higher in spring (LCI = 1.98), whereas parasite abundance and Shannon diversity were significantly lower in autumn (TA = 19.6 and H' = 2.15, respectively). In October (more 'benign' environmental conditions in Iberian streams), minnows could display elevated foraging activity, with fish increasing their health condition and level of parasite resistance/tolerance. Overall results showed a particular seasonal profile of health and parasite infra-communities that allow this minnow species to thrive under highly fluctuating habitat conditions. This information could help environmental managers to control non-native fish in Mediterranean streams.

Assessing habitat suitability and conservation priorities for flagship crane species across critical wetlands in northeast China

Protected areas are considered to be essential shelters for wildlife species and their habitats. At present, approximately 17 % of the world's land areas are under protection, but large conservation gaps still exist. Moreover, to fulfil the global commitment of protecting 30 % of land areas by 2030, identifying potential habitats and conservation priorities for threatened species are urgently required. Therefore, this study aims to assess the habitat suitability of five species of cranes, which are internationally recognized flagship species across critical wetlands in northeast China, and to identify gaps in the current PAs network using a combination of field-based investigation and a species distribution modelling approach. Line transects were repeatedly conducted at monthly intervals to cover the entire migratory and breeding seasons, with a total length of 4622 km. Information on crane occurrences and habitat conditions were recorded during the fieldwork. Results showed that distance from lakes predominantly determined the distribution of the cranes. Winter precipitation affected stopover determination of migratory cranes, and temperature affected the distribution of breeding cranes. The analysis showed that the current PA network could not cover the entire suitable habitat for all crane species, with >50 % of suitable migratory crane habitat and approximately 20 % of suitable breeding crane habitat remaining outside of the PAs. Correspondingly, two conservation priority areas were identified that require effective conservation measures. This study provides critical information on the habitat requirements of five crane species and identifies conservation priorities so that flagship species and critical wetlands can be effectively protected.

Assessing Reliability for Quantifying Social Interactions among Crayfish

Animal behavior is a useful way to evaluate the environment and can be a predictive tool to assess not only the effects of treatments in a laboratory setting, but also the status of ecological habitats. As invasive species of crayfish encroach on territories of native species, the social behaviors and interactions can be informative for ecological studies. For a wider and more impactful effect, training community scientists using a scoring system to record the social interactions of crayfish that includes both the level of aggression and intensity would provide useable data to monitor the environment. Amateur scientists with little training were fairly reliable in their average scoring of the crayfish and the maximum behavior score with an expert as well as among themselves. However, the number of interactions was not as a reliable metric to compare with the expert or just among the amateurs.

Growth patterns and ecological classification of Tor tambra (Valenciennes 1842) in the Mamis River, Leuser Ecosystem Area, Aceh Province, Indonesia

Graphical Abstract Highlight Research 1. Tor tambra is the most dominant species other Tor species in Aceh Province, Indonesia. 2. The population of T. tambra has decreased significantly due to overfishing and environmental destruction. 3. This research aims to examine the habitat characteristics, growth patterns and condition factors of T. tambra. 4. Analysis of the length weight relationship of T. tambra revealed that the condition of the fish was stable . Abstract This research was aimed to examine the habitat characteristics, growth patterns and condition factors of T. tambra in the Mamis River, Leuser Ecosystem Area, Aceh, Indonesia. This research was conducted on the Mamis River in three different river conditions from July to August 2023. The ecological parameters of T. tambra were conducted by observing the main, broodstock, spawning, and nursery ground habitats based on diversity of catch size at a location, water quality, aquatic substrate, aquatic vegetation, and water shade. The growth pattern parameter was also analyzed to reveal the condition of T. tambra. The T. tambra habitat in the Mamis River includes broodstock and spawning habitat with the criteria from small to large rocks overgrown with Bryophytes, gravel and sand substrates, clear water color, slow to swift water currents, and river environment most of it is primary forest. In the main habitat, there is dominant riparian vegetation in the form of forest timber trees such as Pometia pinnata, Ficus fistulosa, Hydnocarpus castanea, and Aglaia tomentosa. The habitat for the juvenile is in the form of rocks, gravel substrate, clear water color, and fast water currents. In the nursery habitat, the dominant riparian vegetation is Balakata baccata. Based on the results of water quality analysis at the three stations, it shows that temperature, pH, DO, currents, BOD, COD are significantly different, but brightness levels are not significantly different. Based on the analysis of the length-weight relationship, it shows that the condition of the fish is stable with sufficient food availability.

An assessment of the water footprint of the population and agricultural crops in the natura 2000 site ROSCI0434 siretul mijlociu, Romania

The designation of a Natura 2000 site ROSCI0434 Siretul Mijlociu for the protection of habitats and species, whose development is closely tied to the aquatic environment, signifies that the management of water resources, and implicitly, the water footprint, has contributed to maintaining a balanced and favorable status for biodiversity conservation. Given that the Natura 2000 site was declared based on older studies, and the Management Plan for the protected natural area was not yet developed, we are now conducting an assessment of the impact of the water footprint in the current climatic conditions. This includes considering other predominant types of agricultural crops and changes in food habits. This evaluation aims to understand the relationship between the water footprint and the conservation status of species and habitats in light of these new circumstances.The blue and grey water components of the water footprint are the ones that directly affect the natural protected area out of the three components of the water footprint: green, blue, and grey water. The ecological impact of water use in ROSCI0434 Siretul Mijlociu is extensive, affecting both terrestrial and aquatic ecosystems. Pollutants can harm habitats and species, while agricultural water usage alters habitats and disrupts hydrological patterns, impacting breeding and foraging grounds. Additionally, changes in water quantity and quality diminish ecosystem services like water purification and habitat provision, affecting biodiversity and human well-being.

Greenbelt's impact on urban forest habitat: Insights from morphological analysis in quantifying conservation effects

Urban forests play a crucial role in preserving biodiversity in highly urbanized areas by providing habitats for various species and promoting ecological connectivity. However, managing urban forests presents challenges such as low habitat quality and fragmentation risks. To address these challenges, protected areas serve as a fundamental policy tool. This study analyzes the effect of Greenbelt areas, protected spaces within urban settings, on future land-use and habitat changes. Through morphological analysis of forest areas, this study attempts to analyze the current status of habitats in cities affected by fragmentation and derive the effects of green belts, thereby presenting the direction of biodiversity conservation for city habitats. The Slope, Land-use, Excluded area, Urban, Transportation, Hillshade (SLEUTH) land-use change model was used to predict future land-use changes by applying a scenario that adjusts weights within the Greenbelt areas. In addition, the Morphological Spatial Pattern Analysis (MSPA) Tool was used to derive changes by habitat type, which aided in deriving the implications of the Greenbelt regulation on the habitat. Our findings indicate that Greenbelt regulation effectively prevents the reduction of critical Core areas and minimizes damage to Islets, small patches. Comparisons between Core and Edge areas reveal that Edge areas are more vulnerable to development, and the impact of regulating the Greenbelt area is significant. In addition, Greenbelt regulations can help prevent habitat fragmentation by reducing Perforation, which creates cavities within Core areas. This study quantitatively demonstrated that the Greenbelt can play an important role not only in preventing urban expansion but playing an important role in habitat conservation in cities.

Habitat persistency analysis with HEM‐PEAK: A novel approach for the assessment of hydropeaking impacts and mitigation measure design

AbstractHydropeaking is one of the most severe pressures of hydropower on aquatic ecosystems. The discharge fluctuations due to turbine operations cause frequent shifts in hydraulic habitat characteristics such as flow velocity and water depth. Those rapid changes on a daily or sub daily basis, however, are beyond the possibilities of evolutionary adaptations of aquatic organisms, especially for fish in their sensitive early life stages. Thus, one central aim in terms of the evaluation of hydropeaking impacts or the design of mitigation measures is the analysis or establishment of hydraulically stable habitat conditions. This study presents a novel habitat assessment tool to quantify hydraulically stable habitat conditions in the form of a persistency of suitable habitats in hydropeaking reaches. The HEM‐PEAK tool determines areas that contain equal ranges of depth‐averaged flow velocity and water depth for both base flow and peak flow in three categories. Those areas also exclude dewatering sites, which have to be seen as ‘residual risk for stranding’. In the present study, the model was used to evaluate the YOY habitats of brown trout and grayling. The model was tested for 14 hydropeaking reaches to evaluate the quantity of habitat persistency for different morphological characteristics, such as straight, winding, alternating gravel bars and bifurcation reaches. The findings reveal that there is no relationship between hydraulically stable habitat conditions with reach scale bed slope or the magnitude of dewatering areas. However, the changes in specific discharge in relation to bankfull width could be negatively related to the magnitude of hydraulically stable habitat conditions independent of the morphological type. This relationship is minor for summer scenarios compared to spring, as the initial habitat quality during the increased base flow conditions is already limiting the availability of suitable habitats which might have persistency during peak flow. In detail, several self‐forming bars like point bars and artificial structures like groins and coarse rip‐rap could be determined, which could be explicitly addressed in terms of mitigation measure design based on the application of the HEM‐PEAK tool.

Ecological and anthropogenic drivers of waterfowl productivity are synchronous across species, space, and time.

Knowledge of interspecific and spatiotemporal variation in demography-environment relationships is key for understanding the population dynamics of sympatric species and developing multispecies conservation strategies. We used hierarchical random-effects models to examine interspecific and spatial variation in annual productivity in six migratory ducks (i.e., American wigeon [Mareca americana], blue-winged teal [Spatula discors], gadwall [Mareca strepera], green-winged teal [Anas crecca], mallard [Anas platyrhynchos] and northern pintail [Anas acuta]) across six distinct ecostrata in the Prairie Pothole Region of North America. We tested whether breeding habitat conditions (seasonal pond counts, agricultural intensification, and grassland acreage) or cross-seasonal effects (indexed by flooded rice acreage in primary wintering areas) better explained variation in the proportion of juveniles captured during late summer banding. The proportion of juveniles (i.e., productivity) was highly variable within species and ecostrata throughout 1961-2019 and generally declined through time in blue-winged teal, gadwall, mallard, pintail, and wigeon, but there was no support for a trend in green-winged teal. Productivity in Canadian ecostrata declined with increasing agricultural intensification and increased with increasing pond counts. We also found a strong cross-seasonal effect, whereby more flooded rice hectares during winter resulted in higher subsequent productivity. Our results suggest highly consistent environmental and anthropogenic effects on waterfowl productivity across species and space. Our study advances our understanding of current year and cross-seasonal effects on duck productivity across a suite of species and at finer spatial scales, which could help managers better target working-lands conservation programs on both breeding and wintering areas. We encourage other researchers to evaluate environmental drivers of population dynamics among species in a single modeling framework for a deeper understanding of whether conservation plans should be generalized or customized given limited financial resources.

Habitat conditions and not moss composition mediate microbial community structure in Swiss peatlands.

Peatlands, one of the oldest ecosystems, globally store significant amounts of carbon and freshwater. However, they are under severe threat from human activities, leading to changes in water, nutrient and temperature regimes in these delicate systems. Such shifts can trigger a substantial carbon flux into the atmosphere and diminish the water-holding capacity of peatlands. Microbes associated with moss in peatlands play a crucial role in providing these ecosystem services, which are at risk due to global change. Therefore, understanding the factors influencing microbial composition and function is vital. Our study focused on five peatlands along an altitudinal gradient in Switzerland, where we sampled moss on hummocks containing Sarracenia purpurea. Structural equation modelling revealed that habitat condition was the primary predictor of community structure and directly influenced other environmental variables. Interestingly, the microbial composition was not linked to the local moss species identity. Instead, microbial communities varied significantly between sites due to differences in acidity levels and nitrogen availability. This finding was also mirrored in a co-occurrence network analysis, which displayed a distinct distribution of indicator species for acidity and nitrogen availability. Therefore, peatland conservation should take into account the critical habitat characteristics of moss-associated microbial communities.

Winter-ground microhabitat use by differently coloured phenotypes affects return rate in a long-distance migratory bird

Migratory bird populations are declining globally at alarming rates. Non-breeding site conditions affect breeding populations, but generalising non-breeding habitat conditions over large spatial regions cannot address potential fine-scale differences across landscapes or local populations. Plumage characteristics can mediate the effects of environmental conditions on individual fitness. However, whether different phenotypes use distinctive non-breeding sites, and whether they respond to non-breeding site conditions differently remains largely unknown. Stable isotopes (δ13C, δ15N, δ2H) of inert tissues are useful to infer habitat characteristics and geographic origins where those tissues were grown. We collected winter-grown feathers from pied flycatchers (Ficedula hypoleuca) on their breeding grounds over several years from males whose dorsal plumage colouration ranged continuously from brown to black and assessed their stable isotope values as proxies of local habitat conditions. Based on feather δ2H profiles we found that browner males spent their non-breeding season in drier habitats than black males. Assignment to origin analysis shows potential regional non-breeding ground separation between differently coloured males. High within-individual repeatability of both δ13C and δ15N indicate the pied flycatcher males return yearly to similar areas. Blacker males were more likely to return to the breeding grounds after dry years compared with brown males. The opposite was found in wet years. Our study demonstrates that different phenotypes are exposed to different non-breeding site conditions which can differentially affect individual survivorship. This has important ramifications for population dynamics under predicted climate change scenarios where especially brown phenotype pied flycatcher males may be under a risk of decreasing.

Characteristics of swiftlet houses on the plains and hills and their contribution to regional development for export development. Case study: Banten Province, Indonesia

Swiftlet bird nests (SBN) have a high selling value for export because they are beneficial for health treatment and are a food ingredient. The sustainability of SBN exports is influenced by the quality of SBN production in swiftlet houses. Banten Province is a producer and supplier of SBN for export and local markets because the SBN produced here is good quality. This study aims to analyze 1) the characteristics of swiftlet houses on plains and hills and 2) the contribution of swiftlet houses to regional development. This study uses a qualitative method with a comparative case study approach. The results showed that 1) There were differences in the characteristics of swiftlet houses located on the plains and hills, namely the geographic location, agro climate, swiftlet house design, food vegetation, and SBN quality; 2) Swiftlet houses contribute to regional development as an opportunity for business and employment in managing swiftlet houses and SBN, as well as SBN quarantine monitoring for export. SBN production is higher in swiftlet houses with suitable habitat and environmental conditions. To increase the sustainability of SBN production, the government and business actors collaborate to preserve the environment and maintain the sustainability of swiftlet houses.

Distribution patterns of the two genetic groups of Corbicula fluminea in a lotic-lentic system.

Differences in local habitat conditions are often implicated as drivers for morphological and genetic divergence in natural populations. However, there are still relatively few studies regarding how divergent habitats influence patterns for morphotypes and genetic lineages in aquatic invertebrates. In this study, we explored the morphological patterns, genetic divergence, and distributions of a bivalve, Corbicula fluminea, in a lotic-lentic system. Sampling locations included lotic, ecotone, and lentic habitats. First, we found two lineages (Lineages A and B) with significant genetic divergence that primarily corresponded to two morphotypes (Morphs D and C) of C. fluminea. Lineage A consisted of 88.68% Morph D (shell sculpture: 8-14 ridges/cmsh) and 11.32% Morph C (shell sculpture: 15 ridges/cmsh) individuals and had genetic similarity to invasive populations. Lineage B consisted of only Morph C (shell sculpture: 15-23 ridges/cmsh). Second, we revealed clear effects of habitat on the spatial distribution patterns for the two lineages of C. fluminea. Lineage A was dominant in lotic habitats, with a significantly higher density than that of Lineage B in these locations. Lineage B was dominant in lentic habitats. However, both lineages had their highest densities in the ecotone habitat, without clear dominance and no significant difference in density between groups. Individuals of Lineages A and B are different in shell morphology, which may be related to a benefit trade-off between shell shapes that allow for rapid burrowing and holding position in different flow conditions. The distribution patterns indicate that Lineages A and B may not prefer uniquely lotic and lentic habitats, but each lineage is more tolerant to one habitat type, respectively. Generally, our study established a correlation among morphotypes, lineages, and different habitats for C. fluminea along a lotic-lentic gradient system, which has important implementations for fisheries management units and for understanding the role of habitat preference for this species in monitoring for pioneer dispersal in invasive species management.

The Biomass Amount of Spontaneous Vegetation Concerning the Abiotic Habitat Conditions in Coal Mine Heaps as Novel Ecosystems

The Biomass Amount of Spontaneous Vegetation Concerning the Abiotic Habitat Conditions in Coal Mine Heaps as Novel Ecosystems

Association Of Shorea Platyclados With Dominant Trees In Martelu Purba Nature Reserve

Shorea platyclados, known to the public as Meranti Bukit, is one of the species whose existence S. platyclados Slooten ex Foxw. or what is known by the local name Meranti Bukit is a type of meranti tree that has fast growth and is recommended as a plant for forest and land rehabilitation activities. S. platyclados is threatened in nature and is included in the Near Threatened (NT) its category based on the IUCN Redlist. Conservation efforts are needed to better understand natural habitat conditions and increase the population of S. platyclados in nature with an ecological approach. An association is a common kind of community that is present in many places and occurs under similar circumstances.. Associations are characterized by having a similar floristic composition, having a uniform physiognomy, and their distribution having a unique habitat. Studies on plant associations around S. platyclados have yet to be revealed so a more in-depth ecological analysis is needed to determine the relationship between S. platyclados and other plants around it. The purpose of this study was to analyze the association between S. platyclados and the dominant trees in the Martelu Purba Nature Reserve area. Using the 2x2 Contingency Table, association analysis was performed on the primary constituent species with an IVI of ≥10%.. The results of the analysis of the type of association between S.platyclados and the dominant tree showed positive for Charcoal and Akhirsap species, while for Modang, Beringin, and Kemenyan species negative association.

Capung (Ordo: Odonata) di Kawasan Reklamasi Bekas Tambang Timah, Belinyu, Bangka

Dragonflies are bioindicator insects that are known to be sensitive to the environment and their existence is influenced by habitat conditions. The potential of dragonflies as a bioindicator for the success of reclamation efforts for former tin mining on Bangka Island needs to be studied. This research aims to record the diversity of dragonflies and damselflies in reclaimed land covering an area of ±15.25 ha and aged ±16 years as one component to enrich the criteria for assessing the success of revegetation of ex-tin mining land. This research was conducted in the rainy season, January-March 2023. For three weeks, Schnabel's visual encounter survey (VES) and capture-mark-release-recapture (CMRR) methods were chosen to observe five transect lines, respectively non-revegetation areas, horticultural and fruit revegetation areas, oil palm revegetation areas, kolong with tilapia fish, and kolong with human activities. This research recorded 19 species of dragonflies and 6 species of damselflies, or around 6.5% of the dragonflies and 2.0% of the damselfly species on the island of Sumatra. The most dominant species are Neurothemis fluctuans and Ceriagrion cerinorubellum. The number of species and number of individual dragonflies is thought to be related to the age of reclamation, and has the potential to be an indicator of the success of ex-tin mining reclamation land. Keywords:“Area Type”; “Bangka”; “Bioindicator”; “Dragonfly”; “Ex-Mined Land Reclamation”