Dietary and habitat specialization, eye size, clutch size, and aerial lifestyle predict avian fragmentation sensitivity in an Andean biodiversity hotpot

Biodiversity and Conservation, Journal Year: 2023, Volume and Issue: 32(12), P. 4057 - 4081

Published: July 22, 2023

Abstract The fragmentation of tropical forests remains a major driver avian biodiversity loss, particularly for insectivores, yet the mechanisms underlying area sensitivity remain poorly understood. Studies in lowland systems suggest that loss food resources, changes to light microenvironments, increased nest predation, and dispersal limitation are possible mechanisms, but these untested montane bird communities. In this study, we related functional traits (quantified using beta estimates from multi-species occupancy model) test above four hypotheses cloud forest community (both resident species just insectivores) Colombian Western Andes. We found with more specialized diets those use canopy subcanopy (loss hypothesis), larger relative eye sizes (light microhabitat clutch (nest predation hypothesis) were significantly sensitive. By contrast, there was no support hypothesis; instead, insectivores pointed wing shapes, aerial lifestyles, These results reduced vegetation structure, late-successional plant species, epiphytic plants may reduce availability fragments. Similarly, ability tolerate higher intensity near fragment edges, or when traversing matrix habitat, be important persistence fragments suggests habitat configuration special importance fragmented Andean landscapes. Overall, lack information on foraging, movement, breeding ecology complicates conservation

Language: Английский

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Citizen science data reveal altitudinal movement and seasonal ecosystem use by hummingbirds in the Andes Mountains

Ecography, Journal Year: 2023, Volume and Issue: 2024(3)

Published: Dec. 12, 2023

Ensuring connectivity is crucial to protect landscapes but it requires knowledge about how animals use ecosystems throughout the year. However, animal movements remain largely unknown in biodiversity hotspots, even for species that fulfill key ecological roles, as case of hummingbirds Andes. In complex topography mountain slopes, movement these avian pollinators may occur either between habitat patches with asynchronous plant blooms or across are located within same elevation bands along altitudinal gradients. Here, we used two decades (2000–2020) records from citizen science data and boosted regression trees predict monthly distributions 55 hummingbird We identified shifts distribution contiguous months calculated changes proportion predicted occupied by ecosystem types. Our findings reveal substantial differences types utilized year had not been previously reported several species. Yet magnitude varies clades, some cases estimated occurs little variation altitude. All Andes show temporal occurrence, higher natural compared croplands urban areas. Finally, phylogenetic logistic test whether affect population trends. found seasonality more strongly associated decreasing populations comparison shifts. Altogether, our study reveals patterns highlights importance different More generally, demonstrates opportunity using increase understanding species' seasonal occurrences, so can be better managed movement. Keywords: trees, eBird, connectivity, models

Language: Английский

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Citizen science data reveals the cryptic migration of the Common Potoo Nyctibius griseus in Brazil

Ibis, Journal Year: 2020, Volume and Issue: 163(2), P. 380 - 389

Published: Nov. 10, 2020

The Common Potoo Nyctibius griseus is abundant, charismatic and generally considered to be sedentary across its range. Using citizen science data from eBird WikiAves, we demonstrate that the may a partial migrant whose breeding populations depart southeastern Brazil, Uruguay northern Argentina in May August during region’s austral winter. MaxEnt models revealed spatio‐temporal shifts distributions were driven by seasonal changes temperature precipitation. We examined potential detection biases restricting our analysis daytime observations testing for seasonally dependent distribution two nocturnal non‐migratory species. Our results provide first evidence of migration any member family Nyctibiidae. approach exposes value WikiAves offer towards elucidating movements South American birds.

Language: Английский

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Distribution models using semi-structured community science data outperform unstructured-data models for a data-poor species, the Plain Tyrannulet

Ornithological Applications, Journal Year: 2021, Volume and Issue: 123(4)

Published: July 20, 2021

Abstract Modeling the distribution of a data-poor species is challenging due to reliance on unstructured data that often lacks relevant information sampling and produces coarse-resolution outputs varying accuracy. Data effort associated with higher-quality, semi-structured derived from some community science programs can be used produce more precise models distribution, albeit at cost using fewer data. Here, we model seasonal ranges Plain Tyrannulet (Inezia inornata), poorly known Austral–Neotropical migrant, compared predictive performance built full dataset species. By comparing these models, examined relatively unexplored tradeoff between quality quantity for modeling data-sparse We found outperformed unstructured-data in accuracy metrics (mean squared error, area under curve, kappa, sensitivity, specificity), despite only 30% available detection records. Moreover, were biologically accurate, indicating tyrannulet favors arboreal habitats dry hot lowlands during breeding season (Chaco region) proximity rivers tropical wet areas nonbreeding (Pantanal, Beni, southwest Amazonia). demonstrate detailed insights into distributional patterns gained even small quantities when are analyzed appropriately. The use promises wide applicability bird species, helping refine habitat use, needed effective assessments conservation status.

Language: Английский

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Unravelling the migratory patterns of the rufous-tailed attila within the Neotropics using citizen science and traditional data sources

Ornithology Research, Journal Year: 2022, Volume and Issue: 30(2), P. 87 - 98

Published: March 23, 2022

Language: Английский

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Dispersal ability correlates with range size in Amazonian habitat-restricted birds

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2020, Volume and Issue: 287(1939), P. 20201450 - 20201450

Published: Nov. 18, 2020

Understanding how species attain their geographical distributions and identifying traits correlated with range size are important objectives in biogeography, evolutionary biology biodiversity conservation. Despite much effort, results have been varied general trends slow to emerge. Studying pools that occupy specific habitats, rather than clades or large groupings of occupying diverse may better identify ranges correlates be more informative for conservation programmes a rapidly changing world. We evaluated correlations between set organismal bird from Amazonian white-sand ecosystems. assessed if consistent when using different data sources phylogenetic hypotheses. found dispersal ability, as measured by the hand-wing index, was both birds non-white-sand sister taxa. White-sand had smaller on average The were similar robust sources. Our suggest patchiness ecosystems limits species’ ability reach new habitat islands establish populations.

Language: Английский

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Bird diversity-environment relationships in urban parks and cemeteries of the Neotropics during breeding and non-breeding seasons

PeerJ, Journal Year: 2022, Volume and Issue: 10, P. e14496 - e14496

Published: Dec. 14, 2022

Background Urbanization will increase in the next decades, causing loss of green areas and bird diversity within cities. There is a lack studies at continental scale analyzing relationship between urban areas, such as parks cemeteries, species richness Neotropical region. Bird diversity-environment relationships cemeteries may be influenced by latitudinal gradients or species-area relationships. However, seasonal variation diversity- environment has not been analyzed Neotropics. Methods surveys were conducted 36 37 18 cities during non-breeding breeding seasons. was assessed through Hill numbers, focusing on richness, effective number derived from Shannon index Simpson index. Environmental variables included latitude, altitude, local area size, habitat pedestrian traffic. Results Species higher season, whereas did vary During both seasons, increased with negatively related to highest 20° latitude. also positively diversity, traffic, suburban season. showed significant size similar cemeteries. Discussion Our results that have roles conserving relations varied highlighting importance conducting annual studies.

Language: Английский

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Seasonal altitudinal movements of birds in Brazil: a review

Zoologia (Curitiba), Journal Year: 2023, Volume and Issue: 40

Published: Jan. 1, 2023

Birds' seasonal altitudinal movements in Brazil are poorly understood. The main source of information and has fostered interest since the 1980s. However, most available is anecdotal, sources repeatedly cited, provided quite superficial speculative. Through bibliographic searches, we found 107 studies, 83 (77%) which consider valid, only 63 (59%) were peer-reviewed. Most studies carried out southern southeastern Brazil. Only 11 explicitly addressed movements. Surprisingly, none simultaneously comprised a full year study, standardized sampling methods, encompassed entire range through birds might have moved. As consequence, quality data questionable, expression "altitudinal migration" unlikely to be accurate never been unequivocally demonstrated for Mention was 68 bird species, but these must more clearly defined appropriately tested.

Language: Английский

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A global analysis reveals the dynamic relationship between sexual selection and population abundance in space and time

Published: Sept. 17, 2023

Sexual selection leads to the evolution of extravagant weaponry or ornamental displays, with bearer these traits gaining a reproductive advantage, potentially at cost individual’s survival. The consequences sexual can therefore impact species demographic processes and overall abundance. Currently, evidence connecting effects demography abundance is conflicting. This study aims rectify this issue by assessing relationship between in Passerines across globe, importantly, accounting for migration seasonality. We integrate global citizen science dataset bird observations Passerine trait data show that seasonality are key moderators For resident Passerines, consistently positive year, whereas migrant neutral, significant negative dip during pre-breeding (for Northern Hemisphere Passerines). Our results suggest bolsters populations experience less intense natural selection.

Language: Английский

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Foraging shifts in a Neotropical Turkey Vulture (Cathartes aura ruficollis) in the presence and absence of a northern migrant (C. a. meridionalis)

The Wilson Journal of Ornithology, Journal Year: 2024, Volume and Issue: 135(3)

Published: Jan. 31, 2024

La competencia intraespecífica juega un papel fundamental en la estructura y uso de recursos las comunidades aves migratorias residentes. Comparamos los movimientos estacionales sobrevivencia aparente cataneja cabeza roja neotropical (Cathartes aura ruficollis) marcada patagialmente con radiotransmisores el centro Venezuela relación a presencia ausencia una subespecie boreal más grande dominante, C. a. meridionalis. Encontramos que algunos individuos ruficollis eran migrantes parciales durante estación seca, utilizaban áreas mayor menor proporción vegetación boscosa ambientes semiabiertos, respectivamente, seca comparación meses húmeda para evitar migratorios boreales, fue baja simpatría alopatría. Nuestro estudio proporcionó evidencia meridionalis podría competir su período residencia tropical, lo respalda hipótesis contribuir separación nichos entre estas subespecies. Palabras clave: cobertura del suelo, competencia, Neotrópico, reparto recursos, Venezuela.

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