Southeastern Brazilian Atlantic Forest Research Articles

A NEW SPECIES OF SIGMOIDOTROPIS (PAPILIONOIDEAE, LEGUMINOSAE) FROM ATLANTIC FOREST, EASTERN BRAZIL

The Brazilian Atlantic Forest is one of the world’s most biodiverse regions and a key center of endemism for various plant groups. Here, we propose the new species Sigmoidotropis snakiae, which is found in the high-altitude Atlantic Forests of southeastern Brazil. Environmental niche modeling indicates potential areas of distribution that are distinct from the known range of the species, suggesting that these current areas may be remnants of a once-larger, interconnected habitat. The significance of conservation areas such as Parque Nacional do Caparaó and Parque Estadual do Forno Grande for the preservation of this species is emphasized. Sigmoidotropis snakiae, together with S. grandiflora, is only the second species of the genus identified in the Brazilian Atlantic Forest.

Smallholders' perspectives, motivations, and incentives for restoring the Brazilian Atlantic Forest

Ecosystem restoration, recognized as a critical strategy for climate change adaptation and mitigation, faces significant challenges in achieving widespread implementation. A particular facet of this challenge lies in the active involvement of rural landowners. Our study aimed to understand rural landowners' perspectives, motivations, and characteristics that influence their participation in restoration projects in the Atlantic Forest of southeastern Brazil. Qualitative content analysis was conducted on 68 semi‐structured interviews with two groups of landowners: 36 who received support and 32 who did not receive project support from a local non‐governmental organization to restore native forests on their landholdings. Approximately three‐quarters of the sample are classified as smallholders (<80 ha). The main difference between the two groups is the dependence on agricultural production as the main source of income, with 22% of farmers in the supported group and 72% in the unsupported group. This socio‐economic characteristic appeared to influence the decision to restore native forest. Farmers' focus tends to be linked to rural production, and the main obstacle to restoration was the loss of productive land. They usually allow natural forest regeneration to establish on slopes. The other type of landowner (lifestylers) mainly restored land through planting of seedlings, with the main barrier being the cost of restoration. Both groups had water conservation as their main motivation for restoration. Our study shows that understanding the perspectives and motivations of the diversity of rural landowners is crucial to effectively engage them and address the socio‐economic feasibility of different restoration approaches.

Use of latrines and territorial marking behaviors by Subulo gouazoubira in a remnant of the Atlantic Forest in southeastern Brazil

Use of latrines and territorial marking behaviors by Subulo gouazoubira in a remnant of the Atlantic Forest in southeastern Brazil

Rediscovery of spectacled owl Pulsatrix perspicillata pulsatrix in the Atlantic Forest of southeastern Brazil with remarks on its taxonomy and distribution

Rediscovery of spectacled owl Pulsatrix perspicillata pulsatrix in the Atlantic Forest of southeastern Brazil with remarks on its taxonomy and distribution

Effects of heavy metals and high temperature on Atlantic Forest species: Analysis of their tolerance capacity

Changes in temperature and the deposition of potential pollutants in the soil, such as heavy metals, may damage plant communities, altering their physiological processes. High temperature may also cause a series of morpho-anatomical, physiological and biochemical changes in plants. However, tolerant plant species tend to restrict these harmful effects. The present study investigates the impact of atmospheric warming on the accumulation capacity of heavy metals (Zn, Ni, Cu) in the roots and leaves of a pioneer species (Croton floribundus) and a non-pioneer species (Esenbeckia leiocarpa) native to the Atlantic Forest of southeastern Brazil. The experimental design involved exposing the plants to two soil treatments: without excess metals (-M) and with excess metals (+M), along with varying thermoperiods of 26 °C day/19 °C night and 32 °C day/20 °C night in growth chambers. Over a 28-day period, we assessed weekly metal content, translocation, growth parameters, a non-enzymatic antioxidant (glutathione) and indicators of cell damage or oxidative stress (chlorophylls a and b, total chlorophyll (a+b), carotenoids, malondialdehyde and conjugated diene hydroperoxide contents). Both species exhibited increased metal accumulation under excess metals, employing distinct translocation strategies. C. floribundus showed high translocation rates of Ni to leaves and E. leiocarpa immobilized Ni in the roots. Atmospheric warming reduced Cu and Ni translocation from roots to leaves in both species. C. floribundus displayed lower physiological damage compared to E. leiocarpa, demonstrating robust growth. We concluded that the pioneer species possessed greater tolerance to oxidative stress induced by temperature and metal-related environmental factors than the non-pioneer species, confirming our hypothesis. In addition, our finding provides valuable insights for conservation and management of ecosystems affected by climatic and pollutant changes.

Two new Dismodix Townes (Hymenoptera, Ichneumonidae, Cryptinae) with an exceptionally broad occipital carina

Dismodix colai sp. nov., from a reforested legal reserve of Atlantic Forest in southeastern Brazil, and D. gladiata sp. nov., from central Brazil, are described and illustrated. Each new taxon is compared with similar species from both Dismodix Townes and the related Acerastes Cushman. Both species can be separated from all others within each genus by having the occipital carina distinctly widened.

Neea bradeana (Nyctaginaceae: Pisonieae), a new species with whorled leaf arrangement from the Atlantic Forest of Southeastern Brazil

Neea bradeana is here described for the Atlantic Rainforest of Southeastern Brazil. This new species had been confused for decades with N. verticillata, the type species of the genus which is described for Peru. N. bradeana is characterized by its unbranched shrubs with whorled sessile or short-petiolate leaves and erect-congested inflorescences. This species is here described and illustrated; remarks on taxonomic and morphologic affinities, distribution map, and conservation assessment are also provided.

Using ecological niche modelling to prioritise areas for conservation of the critically endangered Buffy-Headed marmoset (Callithrix flaviceps).

Endemic to the Atlantic Forest in Southeastern Brazil, the critically endangered Buffy-Headed marmoset (Callithrix flaviceps) is lacking the required attention for effective conservation. We modelled its ecological niche with the main objectives of (1) defining suitable habitat and (2) prioritising areas for conservation and/or restoration. The current geographical range of Callithrix flaviceps in the Atlantic Forest of Southeast Brazil. We used Ensemble Species Distribution Modelling to define current habitat suitability considering four climate and two landscape variables. To identify areas to prioritise for conservation and/or restoration, we predicted future habitat suitability considering the intermediate (RCP4.5) and extreme (RCP8.5) climate change scenarios for the years 2050 and 2070. Among the variables included to predict current species distribution, tree canopy cover, precipitation seasonality and temperature seasonality were the most important whereas digital elevation model and precipitation during the wettest month were the least important. Callithrix flaviceps was most likely to occur in areas with tree canopy cover >80%, high precipitation seasonality and temperature seasonality between 21 and 23°C. From the future suitability prediction maps, the Caparaó National Park stands out as a likely key area for the preservation of the species. Furthermore, high climatic suitability but low landscape suitability suggests that habitat restoration in 'Serra das Torres' (South of the current distribution area) might be a useful strategy. However, creating ecological corridors on the west side of Caparaó would be necessary to improve connectivity. More surveys within and beyond the current geographical range are required to define more precisely the distribution of the species. Our results support the notion that seasonality is important for Callithrix flaviceps and that as a montane species, it prefers colder environments and higher altitudes. Within both climate change scenarios, Caparaó National Park was predicted to be highly suitable, with a high probability of presence.

Massive Bird Nest Losses: A Neglected Threat for Passerine Birds in Atlantic Forest Fragments from the Pernambuco Endemism Center

Understanding the mechanisms by which tropical forest fragmentation can affect the persistence of species and populations is of scientific and practical interest. However, nest survival has been one the least addressed of the potentially harmful effects associated with habitat fragmentation, and studies involving nest predator’s identification are still underdeveloped. The Pernambuco Endemism Center (PEC) is the part of the Atlantic Forest located north of the São Francisco River, in northeastern Brazil, where large forest tracts no longer exist and a wave of bird extinctions has occurred recently. Here, we investigated the nest survival of forest understory birds from three PEC fragments (690, 979, and 1036 ha), and we used infra-red camera traps for predators’ identification. Overall, the apparent nest survival was 15.5%, and nest-day-based survival probability for the four more representative species (including two endemic and threatened taxa) were 2.6, 4.4, 6.9, and 18.9%, being 2.7 to 8.5 times smaller than populations or related taxa from the Atlantic Forest of southeastern Brazil. Predators were marmosets (25%), opossums (25%), tegu (19.4%), coati (16.7%), snakes (8.3%), and hawks (5.5%). Jackknife2 model-predicted nest predator’s richness was 20.7 (SD = 1.6). We reinforce the evidence that nest predation associated with fragmentation can affect negatively the bird populations from tropical forests.

How the Choice of Habitat and Sampling Technique Affects Biodiversity Knowledge: The Case of Cylindromyrmex (Hymenoptera, Formicidae) in the Atlantic Forest

The Atlantic Forest is a biodiversity hotspot, and myrmecologists broadly study its numerous habitats. Even so, much of its biodiversity remains to be discovered, and the choice of collection methods and habitats to be explored directly affect the results obtained, especially in the case of species with cryptic habits, such as Cylindromyrmex ants. The ant subfamily Dorylinae has 11 genera registered in the Neotropics, with Cylindromyrmex Mayr, 1870 being a lineage to the region. The present study reports new records of three Cylindromyrmex species in 13 municipalities located in the Atlantic Forest in southeastern Brazil. It also describes the effect of sampling techniques and habitats on species records. The 78 examined herein specimens belong to the species C. brasiliensis Emery, 1901, C. brevitarsus Santschi, 1925, and C. longiceps André, 1892, and were collected manually or with Malaise traps. Records are distributed along the Espírito Santo state, with a tendency towards higher records in municipalities with mountainous habitats. All records in this region of the Atlantic Forest are associated with the hottest months and with the highest rainfall, suggesting a possible preference for nuptial flights in the summer. Most records of the three Cylindromyrmex species occurred in forested areas (93%), whereas few records belong to urban areas (7%). Although manual collections and Malaise traps are not widely used in research or surveys of ant diversity, these techniques could potentially reveal essential findings for ant ecology.

First Capture of a Jaguar Using a Minimally Invasive Capture System for GPS Tracking in an Isolated Patch of Atlantic Forest in Southern Brazil.

This study presents the first successful capture using GPS tagging of a jaguar (Panthera onca) using a minimally invasive capture system (MICS). We used snare-foot traps and a MICS during two capture campaigns in a fragment of Atlantic Forest in southeastern Brazil. The specimen disarmed snares on different occasions, and capture was only possible with the MICS. The captured jaguar, an estimated 16-year-old adult male, was monitored using a GPS Vertex Plus Iridium collar with an optimal performance of 86% in expected locations. The jaguar's home range (659 km2 by MPC and 174 km2 by 95%K) was within the observed range for the species and the animal was primarily maintained in protected areas. The habitat types most frequently used were native grassland (27.2% of 4798 fixes), marsh (24.8%), and dense lowland forest (24.7%). The use of a MICS for trapping jaguars is a promising technique that shows advantages in terms of efficiency, selectivity, portability, reduced potential risk of injury to animals or trappers, and animal stress compared to other capture methods used for the species.

Influence of forest type on the diversity, abundance, and naïve occupancy of the mammal assemblage in the southeastern Brazilian Atlantic Forest

The Brazilian Atlantic Forest has the highest rate of native vegetation destruction, which is one of the principal drivers of mammal extinctions. Therefore, reducing information gaps regarding diversity patterns, abundance, and habitat use is crucial to understand mammal persistence in fragmented landscapes. Our objective was to establish the γ diversity and to assess the extent to which the α, and β diversity, the relative abundance, and naïve occupation of medium and large-sized mammal communities differ between seasonal and ombrophilous forests. Between January 2019 and March 2020, we placed 22 camera traps in the Atlantic Forest of Minas Gerais. We calculate Hill's numbers using iNEXT.4steps package, the β-diversity with the Betapart package, as well as the relative abundance index (RAI), and naïve occupancy (PAO). We used Kruskal-Wallis and Mann-Whitney statistical tests to compare the RAIs between different species and forest types. Finally, we calculated the correlation between the RAIs and PAOs. We found 32 species, principally from the orders Carnivora and Artiodactyla. The alpha diversity and evenness profiles were not different between the two forest types (seasonal q0 = 0.91, q1 = 0.99, q2 = 1, J = 0.83; ombrophilous q0 = 0.96, q1 = 0.99, q2 = 1, J = 0.85). The beta diversity was low (βJAC = 0.37) which was mostly associated with species turnover (βJTU = 0.34), while nestedness was almost non-existent (βJNE = 0.02). The RAIs varied among mammalian species (H = 115.24, P = 0.000), with the highest values for Didelphis aurita (RAI = 4.55 ± 7.66) and Cuniculus paca (RAI = 2.35 ± 3.73) and the minor values for Speothos venaticus (RAI = 0.04 ± 0.24) and Galictis cuja (RAI = 0.06 ± 1.19). The RAIs of species was not significantly different between forests (U = 453.5; Z = 0.37; P = 0.70), and only Leopardus wiedii showed significant differences between forests (U = 84.5; P = 0.01). Most of the mammalian species had restricted occupancy to a few localities (< 50 %). The species Eira barbara and Didelphis aurita had the highest PAOs in both forests (> 50 %), and the species Tayassu pecari, Tamandua tetradactyla, and Speothos venaticus, the lowest values (5 %). We found a correlation of 75 % between the average RAI and naïve occupancy. The γ diversity was representative and consistent with the species found in the Atlantic Forest, and the relative abundance and naïve occupancy reflected the rarity of most species in the area. Additionally, the only difference between the two forests corresponds to species turnover. Therefore, we must conserve native remnants of both forests to ensure the existence of native mammals, mainly the most threatened species, to prevent more dramatic scenarios of local extinction in Minas Gerais.

Natural History of the Flattened Waterfall Frog <i>Cycloramphus boraceiensis</i> (Anura, Cycloramphidae)

Cycloramphus boraceiensis is an endemic frog of the Atlantic Forest of southeastern Brazil. Although relatively easy to find and distributed over a well-sampled region in southeast Brazil, little is known about its natural history, breeding activity, and vocal repertoire. In the present study, we provide new information on pre-and post-hatching larval development, describe new traits of their advertisement calls, describe its aggressive call for the first time, and provide new data about adults’ and tadpoles’ defensive strategies. We found individuals on rocks on cascaded streams or within rocky crevices along streams inside forested habitats. Males concentrated their calling activity between 03:00 and 5:00 h and between 19:00 and 23:00 h. The aggressive call is shorter than the advertisement call and has greater variation in the number of pulses and emission rate. The eggs hatched at Gosner’s stage 25, after seven and eleven days of oviposition, and tadpoles took between eight and ten days to complete metamorphosis. This study contributes to the knowledge of the Flattened Waterfall Frog by filling natural history gaps that can be useful for species conservation and bringing attention to traits that still need further investigation, such as color plasticity and microhabitat selection.

Rediscovery of Forcipomyia (Trichohelea) opilionivora (Lane, 1947) (Diptera, Ceratopogonidae) in Brazil after 75 years

The species Forcipomyia (Trichohelea) opilionivora (Lane, 1947) (Diptera, Ceratopogonidae) was rediscovered in the state of Rio de Janeiro, Brazil, 75 years after its original description. This study aimed to investigate the ectoparasitic relationship between F. (T.) opilionivora and its host and document its occurrence, which was recorded serendipitously during the collection of Opiliones (harvestmen) specimens in Parque Nacional do Itatiaia in the state of Rio de Janeiro, Brazil. After the collection, both specimens were subjected to photographic documentation and preserved for further examination. This study presents the first photographic record of the ectoparasitic relationship between F. (T.) opilionivora and a harvestman, shedding light on a poorly studied interaction. The host specimen was identified as a female of Holcobunus nigripalpis Roewer, 1910 (Opiliones, Sclerosomatidae), a gagrelline commonlyfound in the Atlantic Forest of southeastern Brazil. Previous records of ectoparasitism between Ceratopogonidae and harvestmen were limited to the family level (Sclerosomatidae species, specifically Gagrellinae or Leiobuninae). However, no specific host species had been identified until now. The rediscovery of F. (T.) opilionivora, along with the identification of its host, addresses a significant gap in our knowledge regarding the biology and distribution of this species and provides valuable insights into the intricate relationships between biting midges and arachnids. This study emphasizes the need for further investigations into the biology of these ectoparasitic species and underscores the importance of documenting and studying lesser-known interactions within ecosystems.

Impacts of Slash-and-Burn Cultivation on the Soil and Vegetation of the Atlantic Forest in Southeastern Brazil

Impacts of Slash-and-Burn Cultivation on the Soil and Vegetation of the Atlantic Forest in Southeastern Brazil

The spatial arrangement of sexes is related to reproductive allocation in mosses: a comparative study of reproductive allocation in three different monoicous sexual systems.

We examined the relationship between reproductive allocation and vegetative growth in three monoicous sexual systems of bryophytes. The sexual systems show a gradient of increasing distance between the sexes, from gonioautoicous to cladautoicous to rhizautoicous. Here, we investigated the following two hypotheses: (1) reproductive allocation differs between sexes and sexual systems, and male reproductive allocation increases with increasing distance between male and female gametangia; and (2) reproductive allocation is negatively related to vegetative growth. We sampled the three sexual systems, represented by three moss species of the genus Fissidens in the Atlantic Forest of Southeastern Brazil. Ramets were washed in the laboratory; the reproductive structures were detached from the vegetative ramets and sorted regarding sex and individual, dried at 70 °C for 72 h, and weighed in an ultramicrobalance. We calculated the mean reproductive and vegetative mass and reproductive allocation and used generalized linear models to test our predictions. Reproductive allocation differed between species and sexes. It was higher in the rhizautoicous than in the cladautoicous and gonioautoicous species. Mean reproductive allocation was greater in males than in females of the rhizautoicous species, greater in females than males of the cladautoicous species, and did not differ between the sexes in the gonioautoicous species. Estimates of reproductive and vegetative mass were positively related in females of the rhizautoicous species. Vegetative mass was not related to reproductive allocation in the gonioautoicous species, but negatively related to reproductive allocation in the male and female branchlets of the cladautoicous species and in the female ramets of the rhizautoicous species. The reproductive allocation patterns differ between the rhizautoicous species and the 'truly' monoicous species, with shorter intersexual distances, which implies that our hypotheses were supported only in part. We suggest that the hypotheses should be reformulated and tested further by comparing 'truly' monoicous species with dioicous species and by including other genera.

A new species of Parasycorax, Duckhouse (Diptera, Psychodidae, Sycoracinae) from the Atlantic Forest in southeastern Brazil and Geographic Distribution of the genus.

A new species of Parasycorax, Duckhouse (Diptera, Psychodidae, Sycoracinae) from the Atlantic Forest in southeastern Brazil and Geographic Distribution of the genus.

Taking care of the enemy: egg predation by the Darwin wasp Tromatobia sp. (Ichneumonidae) on the cobweb spider Chrysso compressa (Araneae, Theridiidae)

Some wasp species use spiders as food resources, overcoming several anti-predator barriers that are exerted by spiders. Tromatobia ichneumonid wasps are spider egg predators that usually attack Araneidae species, although there are few records of predation on Clubionidae, Philodromidae, Linyphiidae, Tetragnathidae, and Theridiidae spiders. Here, we describe the interaction between Tromatobia sp. and Chrysso compressa, a subsocial theridiid spider that exhibits extended maternal care, in the Atlantic Forest of southeastern Brazil. We observed that the larva of Tromatobia sp. develop inside the egg sacs of C. compressa, preying on the entire egg mass and building cocoons that change the color and morphology of the egg sacs. Despite these structural modifications, we registered an adult female of C. compressa guarding and caring for the cocoons (attacked egg sac) of the predators as if they were offspring (non-attacked egg sac). To the best of our knowledge, this study represents the first record of Tromatobia preying on Chrysso eggs.

Floral scent chemistry of sympatric species of Philodendron (Araceae) sharing a common pollinator in the fragmented coastal Atlantic Forest of southeastern Brazil

Floral volatiles are crucial components in flower advertisement, often contributing to the reproductive isolation of angiosperms through scent-mediated differential pollinator attraction. Recently, there were significant advances in our understanding of the chemical communication between plants and cyclocephaline beetles, a predominant group of Neotropical pollinators. However, details on how the floral scent chemistry differs or converges among species pollinated by different or the same cyclocephaline beetle species are still unknown. Here, we used dynamic headspace sampling and gas chromatography coupled with mass spectrometry to investigate the floral fragrance chemistry of eight co-flowering Philodendron (Araceae) species that share a single pollinator, Cyclocephala variolosa (Melolonthidae, Cyclocephalini). Additionally, we compared our results to published data on the floral fragrances of different conspecifics pollinated by other species of cyclocephaline beetles. Although all the investigated Philodendron spp. emitted perceivably intense floral scents, the number of volatile organic compounds in the analyzed samples varied between 1 and 50 among species. Also, the overall relative scent composition strongly differed among species (or chemotypes). The floral scents of four of the investigated species (P. appendiculatum, P. cordatum, P. crassinervium, and P. eximium) and one of the two chemotypes of P. corcovadense were dominated by (Z)-jasmone (46 to 100% total relative concentration). High relative amounts of (Z)-2-pentenyl acetate (44 to 66%) characterized the samples of P. undulatum and Philodendron bipinnatifidum, while (E)-4,8-dimethyl-1,3,7-nonatriene was the main constituent in samples of P. curvilobium (75%) and the other P. corcovadense chemotype (56%). The scents of Philodendron spp. pollinated by C. variolosa differed from those of conspecifics associated with other cyclocephaline beetle species, but we also verified significant interspecific variation among these species sharing a common pollinator. We hypothesize that this community of co-flowering plants might be reproductively isolated despite being pollinated by the same pollinator species and having partly overlapping scent compositions.

Citizen science expanding knowledge: a new record of the lizard Heterodactylusimbricatus (Squamata, Gymnophthalmidae) in south-eastern Brazil.

Through citizen science projects, like Projeto Bromélias, community members contribute valuable data on species diversity, notably those with low detectability like the Heterodactylusimbricatus lizard. A recent observation in the State of Espírito Santo (south-eastern Brazil), amidst coffee and eucalyptus crops, highlights the utility of widespread technology use in tracking and documenting wildlife. Such initiatives are especially beneficial for mapping the distribution of rare, endemic or endangered reptiles. Therefore, we advocate for more citizen science initiatives near protected areas, involving local communities. We provide a new record for the species Heterodactylusimbricatus, a microteiid lizard of low detectability from the Atlantic Forest of south-eastern Brazil. Heterodactylusimbricatus (Rio de Janeiro Teiid) was recorded near the protected area "Reserva Biológica Augusto Ruschi" by a citizen volunteer who contributes herpetofauna records to the Bromelias Project (https://www.inaturalist.org/projects/projeto-bromelias). Heterodactylusimbricatus is a very poorly-known species in the localities where it occurs, probably due to its fossorial habit, genera's restricted occurrence range, habitat specificity and the absence of proper survey methods fitted to fossorial species, such as the utilisation of pitfall traps. By publishing the records of volunteer citizens, we hope that more people will contribute to increase the knowledge of biodiversity in the mountainous region of Espírito Santo State and expand our collective knowledge.