Biotropica最新文献_第5页

El Niño Drought Affects Tree Mortality in New Guinea Forest El Niño干旱影响新几内亚森林的树木死亡率

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-07-07 DOI: 10.1111/btp.70231

Hayden Wagia, Pavel Fibich, Fanie Venter, Mex Peki, Cossey Yosi, Vojtěch Novotný, Douglas Sheil

{"title":"El Niño Drought Affects Tree Mortality in New Guinea Forest","authors":"Hayden Wagia, Pavel Fibich, Fanie Venter, Mex Peki, Cossey Yosi, Vojtěch Novotný, Douglas Sheil","doi":"10.1111/btp.70231","DOIUrl":"https://doi.org/10.1111/btp.70231","url":null,"abstract":"<div>\u0000 \u0000 Climate change is increasing drought frequency and intensity in many tropical forests. It remains uncertain how the changing patterns of drought may impact the forests of New Guinea where rugged terrain provides contrasting wetness conditions. We examined mortality responses of 21,102 trees (DBH ≥ 1 cm) across 147 quadrats in a 50-ha lowland forest plot during the 2015–2017 El Niño drought in Papua New Guinea, comparing mortality across three topographic positions (valley, slope, and ridge) during pre-drought (2009–2015), drought (2015–2017), and post-drought (2017–2019) periods. Small trees showed 2–4 times higher mortality than large trees, but both size classes responded proportionally similarly to drought (no size × drought interaction). Topographic effects varied significantly with the census period. Valley trees maintained the highest mortality during pre-drought and drought periods (7.80% and 8.81% per year respectively for 1-cm DBH trees) but recovered rapidly post-drought (mortality declining to 4.91% per year). Ridge trees showed contrasting patterns, with mortality increasing from 4.66% to 7.07% per year and remaining elevated post-drought. Critically, post-drought mortality exceeded pre-drought levels (p < 0.01) while drought-period mortality did not differ significantly from pre-drought (p = 0.081), indicating strongly lagged mortality responses. These results indicate that topographic position governs both immediate drought vulnerability and recovery trajectories, with ridge habitats showing persistent stress despite harboring drought-adapted species. Our results highlight the distinct topographic responses and vulnerabilities of New Guinea's rainforests to drought.\u0000 </div>","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148462851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bird Use of Arboreal Water Sources in the Peruvian Amazon 秘鲁亚马逊地区树木水源的鸟类利用

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-07-06 DOI: 10.1111/btp.70233

Jeannine H. Richards, Rebecca M. Brunner, Katterine Garly Aliaga Pashanaste, Tristan Dumas, Carissa Ganong, David E. Madden, Andrew Mezheritskiy, Nancy M. Trautmann, Jordan Wolf

引用次数: 0

Pollinator Diversity and Pollen Flow of an Emergent Tropical Tree Species in a Fragmented Forest 破碎森林中一种新兴热带树种的传粉者多样性和花粉流

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-06-23 DOI: 10.1111/btp.70228

Supparat Tongkok, Mark Jun M. Alcantara, Laksamee Punthuwat, Arisa Kaewmano, Loke Thian Yew, Tuanjit Sritongchuay, Kyle W. Tomlinson

{"title":"Pollinator Diversity and Pollen Flow of an Emergent Tropical Tree Species in a Fragmented Forest","authors":"Supparat Tongkok, Mark Jun M. Alcantara, Laksamee Punthuwat, Arisa Kaewmano, Loke Thian Yew, Tuanjit Sritongchuay, Kyle W. Tomlinson","doi":"10.1111/btp.70228","DOIUrl":"https://doi.org/10.1111/btp.70228","url":null,"abstract":"<div>\u0000 \u0000 In fragmented landscapes, pollination is key for connectivity within and between plant populations, improving fecundity and genetic diversity. Pollination research has largely focused on crops and understory plants, while trees, the key components of tropical forests, have received much less attention. In this study, we used colored sticky traps to investigate the pollination biology of a large-seeded tree, Antiaris toxicaria Lesch. (Moraceae), across six forest fragments within a 10-km radius in Xishuangbanna, southwest China. We explored how forest fragmentation shapes pollinator assemblages and potential pollen mass flow patterns, and how these patterns varied across different pollinator groups. We collected 1137 morphospecies that were confirmed to carry pollen grains of A. toxicaria. Dipterans and hymenopterans were the most species-rich and carried the greatest number of pollen grains. Pollinator richness and abundance showed hump-shaped relationships with fragment size, potentially due to edge effects in the medium-sized fragments and dilution effects in the largest fragments. In contrast, pollen mass flow increased with increasing fragment size, except in the smallest fragment, where we found a substantial increase likely due to the high density of focal trees. These results suggest that habitat fragmentation only negatively impacted potential pollination processes in small fragments through reduced pollinator diversity. Protecting and improving connectivity among medium to large fragments may help sustain pollination processes in fragmented landscapes. Future research on pollinator behavior and whether pollen is successfully dispersed among fragments would provide additional insights as to whether the populations of large-seeded plants retain viability in small to medium-sized fragments.\u0000 </div>","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Avian Responses to Cloud Line Along an Elevational Gradient of a Tropical Island 鸟类对热带岛屿海拔梯度云线的响应

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-06-17 DOI: 10.1111/btp.70221

Ayeshma S. Adikari, Pavanthi Sudasinghe, Hasani S. Karunaratne, Sandun J. Perera, Sampath S. Seneviratne

{"title":"Avian Responses to Cloud Line Along an Elevational Gradient of a Tropical Island","authors":"Ayeshma S. Adikari, Pavanthi Sudasinghe, Hasani S. Karunaratne, Sandun J. Perera, Sampath S. Seneviratne","doi":"10.1111/btp.70221","DOIUrl":"https://doi.org/10.1111/btp.70221","url":null,"abstract":"<div>\u0000 \u0000 Cloud lines, defined as persistent bands of stratus clouds along elevational gradients, create abrupt shifts in temperature, humidity, and visibility that can profoundly influence biodiversity. We investigated the effects of cloud lines on avian species richness and community structure along a one-kilometer elevational gradient (480–1420 m) located in the sub-montane zone of Sri Lanka—a tropical continental island in the northern Indian Ocean. Standardized avian surveys were conducted over 1 year using visual, acoustic, mist-net, and camera-trap methods across ten permanently marked transects situated along contour lines spanning the gradient. The elevation of the cloud line was recorded using visibility charts, and environmental covariates were measured in each transect. Species richness declined significantly with increasing distance from the cloud line (Pearson r = −0.22, p = 0.05). In negative binomial models controlling for elevation, light intensity, and habitat complexity, the cloud line emerged as a significant predictor of avian richness (ΔAIC > 18). Among the 96 species recorded—including 23 endemics—those with broader elevational ranges exhibited a stronger association with the cloud line (p < 0.001). The distribution of birds was non-random with respect to cloud line elevation (Chi-square: p < 0.001), particularly at lower elevations. These findings underscore critical conservation concerns, as climate-driven shifts in cloud line position may disproportionately affect biodiversity confined to cloud-associated habitats such as tropical cloud forests.\u0000 </div>","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148282148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Species Spatial Distribution is Not Associated With Leaf Turgor Loss Point in an Aseasonal Wet Tropical Lowland Forest 季节性热带湿低地森林物种空间分布与叶片膨胀损失点无关

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-06-16 DOI: 10.1111/btp.70230

Eugénie Mas, Kristina J. Anderson-Teixeira, Johannes Brändle, Stuart J. Davies, Hamdan Bin Omar, Valentine Herrmann, Yoshiko Kosugi, Sean M. McMahon, José A. Medina-Vega, Ines K. Münchinger, Lawren Sack, Tze Leong Yao, Norbert Kunert

{"title":"Species Spatial Distribution is Not Associated With Leaf Turgor Loss Point in an Aseasonal Wet Tropical Lowland Forest","authors":"Eugénie Mas, Kristina J. Anderson-Teixeira, Johannes Brändle, Stuart J. Davies, Hamdan Bin Omar, Valentine Herrmann, Yoshiko Kosugi, Sean M. McMahon, José A. Medina-Vega, Ines K. Münchinger, Lawren Sack, Tze Leong Yao, Norbert Kunert","doi":"10.1111/btp.70230","DOIUrl":"https://doi.org/10.1111/btp.70230","url":null,"abstract":"<div>\u0000 \u0000 Drought tolerance inferred from functional traits has been shown to explain tree species distributions with respect to rainfall and topography in dry tropical forests, but the extent to which drought tolerance may influence species distributions in wet tropical forests remains unclear. We measured the leaf water potential at turgor loss point (ΨTLP), a leaf hydraulic trait associated with drought tolerance, and representing the leaf water potential threshold for wilting, for 58 abundant tree species in an aseasonal lowland tropical forest in Peninsular Malaysia. We tested whether tree spatial distribution in relation to topographic soil moisture levels (i.e., Topographic Wetness Index; TWI) within a 50-ha forest plot (the ForestGEO Pasoh plot) was related to ΨTLP. We found that 76% of species showed spatial associations with TWI within the 50-ha plot. Species' spatial association with soil moisture levels was statistically independent of ΨTLP. Even in wet tropical forests defined by no distinct dry season, soil moisture associated with topography exerts a strong influence on tree species distributions, but topographic distributions are not associated with one of the components of species' drought tolerance as quantified with ΨTLP. These findings highlight the sensitivity of tropical forests to variation in soil water levels, regardless of species' capacity to maintain physiological function under drier conditions, leading to a potential shift in community assemblages and structures following extreme events.\u0000 </div>","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148282355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Once and Future Amazon Forest? Climate and Landscape Change May Drive the Expansion of Nutrient-Poor Amazonian Ecosystems 曾经和未来的亚马逊森林？气候和景观变化可能推动营养贫乏的亚马逊生态系统的扩张

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-06-16 DOI: 10.1111/btp.70229

Orlando Acevedo-Charry, Scott K. Robinson, Bette A. Loiselle, Miguel A. Acevedo

引用次数: 0

Acoustic Differentiation Between Courtship and Advertisement Calls in the Poison Frog Oophaga sylvatica (Dendrobatidae, Anura) 树蛙求偶声和广告声的声学差异（无尾目树蛙科）

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-06-15 DOI: 10.1111/btp.70224

Moira Leanda Maxi Wiedebusch, Andres Merino-Viteri

{"title":"Acoustic Differentiation Between Courtship and Advertisement Calls in the Poison Frog Oophaga sylvatica (Dendrobatidae, Anura)","authors":"Moira Leanda Maxi Wiedebusch, Andres Merino-Viteri","doi":"10.1111/btp.70224","DOIUrl":"https://doi.org/10.1111/btp.70224","url":null,"abstract":"<div>\u0000 \u0000 Anuran vocalizations are crucial for essential behaviors such as reproduction and territoriality. While advertisement calls are extensively documented, subtle courtship calls remain poorly studied. This is worrisome as these calls play an important role in mate selection and reproductive success. Oophaga sylvatica is an ideal study object due to its abundance, disturbance adaptation, and complex reproduction behavior, whose courtship call has never been described. This study provides the first characterization of the O. sylvatica courtship call from northwestern Ecuador and compares it directly to the advertisement call. Utilizing modern bioacoustic analysis to convert sound into quantifiable data, we determined that the courtship call consists of uniform, non-modulated pulsed notes (mean duration: 0.083 s; dominant frequency: 3239 Hz). The courtship call differs from the advertisement call by having longer notes and narrower frequency, with no change in amplitude. This suggests an adaptation for private, close-range communication, potentially allowing a male to signal his fitness to a female while minimizing the risk of alerting competitors or predators. These findings provide new insights into the acoustic communication in this species, helping bridge knowledge gaps in its reproductive behavior and discussing the role these calls play in courtship, mate selection, and reproductive success.\u0000 </div>","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tail Luring and Rain Harvesting in Neotropical Bothrops Pitvipers: Implications for the Ecology and Evolution of These Behaviors 新热带Bothrops Pitvipers的诱尾和雨水收集：对这些行为的生态学和进化意义

IF 1.9 3区环境科学与生态学

Biotropica Pub Date : 2026-06-15 DOI: 10.1111/btp.70227

Xavier Glaudas, Eletra de Souza, Marcio Martins

引用次数: 0

Seasonal Diet and Seed Dispersal by Sloth Bears Melursus ursinus in Western India 印度西部树懒熊的季节性饮食和种子传播

IF 1.7 3区环境科学与生态学

Biotropica Pub Date : 2026-06-11 DOI: 10.1111/btp.70223

Utkarsh Prajapati, K. S. Gopi Sundar, Vijay Kumar Koli

{"title":"Seasonal Diet and Seed Dispersal by Sloth Bears Melursus ursinus in Western India","authors":"Utkarsh Prajapati, K. S. Gopi Sundar, Vijay Kumar Koli","doi":"10.1111/btp.70223","DOIUrl":"https://doi.org/10.1111/btp.70223","url":null,"abstract":"<div>\u0000 \u0000 Large omnivorous mammals can play multifunctional roles in tropical ecosystems by linking trophic processes with plant regeneration dynamics, yet their contributions remain poorly understood in seasonally dry forests. We investigated seasonal variation in sloth bear (Melursus ursinus) diet and their potential role as seed dispersers in a semiarid deciduous forest of the Aravalli mountains in western India. Diet was assessed through scat analysis in the winter and summer seasons from November 2020 to October 2021, and seed dispersal effectiveness was evaluated using germination and survival experiments on seeds recovered from scats and those collected directly from plants. Sloth bear diet exhibited pronounced seasonal shifts, with fruits dominating winter diets and insects constituting a larger proportion during summer. Fruit consumption was selective and not consistently proportional to availability, indicating preferential foraging. Seeds of six plant species remained viable after gut passage, with germination success varying among species. For four species, post-germination survival of seedlings from scat seeds and from plant-collected seeds was not significantly different, while seedlings from plant-collected seeds of Grewia flavescens and from scat seeds of Diospyros melanoxylon survived better. Germination of the nonnative invasive shrub Lantana camara occurred only from scat-derived seeds. Our findings demonstrate that sloth bears function as selective seed dispersers, including enhancing the germination success of an invasive shrub in dry deciduous forests. Our findings highlight the importance of increasing focus on how large omnivores influence plant regeneration thereby potentially affecting landscape-level vegetation dynamics in tropical seasonal ecosystems.\u0000 </div>","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Is There Life After Death? The Role of Standing Dead Phorophytes in Supporting Tropical Epiphyte Diversity 死后还有生命吗？立死植物在支持热带附生植物多样性中的作用

IF 1.7 3区环境科学与生态学

Biotropica Pub Date : 2026-06-10 DOI: 10.1111/btp.70222

Camila Nardy Delgado, Samyra Gomes Furtado, Luiz Menini Neto, Flavio Nunes Ramos

{"title":"Is There Life After Death? The Role of Standing Dead Phorophytes in Supporting Tropical Epiphyte Diversity","authors":"Camila Nardy Delgado, Samyra Gomes Furtado, Luiz Menini Neto, Flavio Nunes Ramos","doi":"10.1111/btp.70222","DOIUrl":"https://doi.org/10.1111/btp.70222","url":null,"abstract":"Global increases in tree mortality from climate change and land-use are altering forest structures, impacting canopy-dwelling plants like vascular epiphytes, which depend on host trees (phorophytes). When a phorophyte dies standing, it becomes a snag, the local substrate conditions change and microclimatic exposure may increase, particularly in more canopy-exposed individuals. The ecological role of snags in supporting epiphyte diversity remains poorly understood. We examined how snags contribute to epiphyte diversity in a dwarf cloud forest in southeastern Brazil. We surveyed 887 phorophytes (778 alive, 109 dead) across 24 plots, recording 127 epiphyte species. Snags, comprising 12% of phorophytes, supported 57% of the total epiphyte richness. Community composition on snags was a nested subset of that on living trees, with no species exclusive to dead phorophytes. Sample-based rarefaction confirmed that, overall, snags supported significantly lower species richness (q = 0) and dominant species diversity (q = 2). Structurally, snags also differed significantly, being shorter, having smaller diameters (DBH), and rougher bark than living trees. While NMDS showed community structure correlated with elevation, height, and bark, this pattern was phorophyte-species-dependent. Contrary to the general trend, analysis of the dominant phorophyte Eremanthus erythropappus (“candeia”) revealed no significant differences in epiphyte richness (q = 0) or dominant diversity (q = 2) between living and dead individuals. Our results suggest snags function as secondary refuges, but their capacity to buffer epiphyte loss could be mediated by host species traits.","PeriodicalId":8982,"journal":{"name":"Biotropica","volume":"58 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/btp.70222","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0