Environmental correlates of richness, community composition, and functional traits of terrestrial birds and mammals in a fragmented tropical landscape

Cook, Rachel N.; Ramirez‐Parada, Tadeo; Browne, Luke; Ellis, Mike; Karubian, Jordan

doi:10.1007/s10980-020-01123-4

Cited by 10 publications

(11 citation statements)

References 65 publications

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“…Next, we converted grid cells to nonforest if the cell had forest loss between 2013 and the year of sampling (Browne & Karubian, 2016; Hansen et al, 2013). We calculated the proportion of grid cells classified as forests within circular plots of 2 km and 500 m from the center of each BBS transect and fragment and selected the 500 m in all subsequent analyses because it was a better predictor of bird diversity (Cook et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Hummingbird diversity in a fragmented tropical landscape in the Chocó biogeographic zone

et al. 2023

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Forest loss and fragmentation drive widespread declines in biodiversity. However, hummingbirds seem to exhibit relative resilience to disturbance, characterized by increasing abundance alongside declining species richness and evenness. Yet, how widespread this pattern may be, and the mechanisms by which it may occur, remain unclear. To fill in this knowledge gap, we investigated habitat‐ and site‐level patterns of diversity, and community composition of hummingbirds between continuous forest (transects n = 16 in ~3500 ha) and more disturbed surrounding fragments (n = 39, 2.5–48.0 ha) in the Chocó rain forest of northwestern Ecuador. Next, we assessed within‐patch and patch‐matrix characteristics associated with hummingbird diversity and composition. We found higher hummingbird species richness in forest fragments relative to the continuous forest, driven by increased captures of rare species in fragments. Community composition also differed between continuous forest and fragments, with depressed evenness in fragments. Increased canopy openness and density of medium‐sized trees correlated with hummingbird diversity in forest fragments, although this relationship became nonsignificant after applying false discovery rate (p < .01). Higher species richness in fragments and higher evenness in the continuous forest highlight the complex trade‐offs involved in the conservation of this ecologically important group of birds in changing Neotropical landscapes. Abstract in Spanish is available with online material.

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Section: Methodsmentioning

confidence: 99%

Hummingbird diversity in a fragmented tropical landscape in the Chocó biogeographic zone

et al. 2023

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“…The canopy was considered as open (≥66% open), partially open (33-66 open), or closed (0-33% open), with a corresponding score of 1, 0.5, or 0, respectively. At each station, an average was calculated for the five camera-traps, thus resulting in a continuous canopy openness index ranging from 0 to 1 [64]. We collected the elevation data at each camera-trap location, using a Garmin Dakota 20 GPS.…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

Spatial Occupancy, Local Abundance and Activity Rhythm of Three Ground Dwelling Columbid Species in the Forests of Guadeloupe in Relation to Environmental Factors

2022

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Although forest-dependent, tropical island endemic birds are particularly at risk of extinction, they remain largely understudied. In this context, we assessed the spatial occupancy, local abundance, and diel activity in three forest columbid species of hunting interest, the Ruddy Quail-Dove (RQD), Geotrygon montana; the Bridled Quail-Dove (BQD), Geotrygon mystacea; and the Zenaida Dove (ZD), Zenaida aurita, in Guadeloupe (French West Indies), using 5 camera-traps over 14 days on 24 survey stations, resulting in 1680 trap days. The number of observed RQD was too small to allow for a statistical comparison between habitats. BQD were more frequently observed at camera-trap stations that were dominated by tropical rainforest than those that were dominated by flooded forest. Conversely, ZD were more frequently observed at stations that were dominated by flooded forest and dry forest than at those that were dominated by tropical rainforest. High temperatures negatively affected the abundance of BQD, while the abundance of ZD was significantly lower in tropical rainforests compared to dry and flooded forests and tended to increase with canopy openness. The three species were diurnal. BQD significantly positively co-occurred spatially and temporally with small Indian mongooses, Urva auropunctata, whereas the temporal and spatial distribution of ZD overlapped significantly with that of domestic dogs, Canis familiaris, and domestic cats, Felis catus. Our results provide firm evidence that RQD remains scarce and is largely outnumbered by BQD in Guadeloupe which is in contrast with has been reported for other Caribbean islands.

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“…REMACH is affected by severe rates of deforestation (Durães et al 2013;Van der Hoek 2017). Studies have documented the effects of deforestation for understory birds (Durães, et al 2013), frugivorous birds (Walter et al 2017), nocturnal birds (Walter et al 2017, herpetofauna (Jongsma et al 2014), avian malaria (Riveiro de Aguilar et al 2018), euglossine bees (Botsch et al 2017), palms (Browne and Karubian 2016), and terrestrial mammals and birds (Cook et al 2020). No known studies of effects of deforestation on aquatic species of REMACH have been published to date.…”

Section: Study Areamentioning

confidence: 99%

Richness and abundance of stream fish communities in a fragmented neotropical landscape

et al. 2021

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Environmental conditions influence ecological processes that shape stream community diversity and abundance. Deforestation has the potential to limit available particulate organic matter and raise stream temperatures. The degree to which tropical stream communities are impacted by these changes is likely to differ between systems, but empirical data from tropical regions are lacking. This lack of baseline data hinders conservation policy as well as efforts to better understand biogeographic and anthropogenic impacts on species' distributions. To fill this knowledge gap, we surveyed 27 sites in six previously unstudied streams across a gradient of deforestation in northwest Ecuador and assessed the degree to which localized deforestation predicted patterns of community composition of fishes. Using general linear mixed models and AICC we found that neither forest fragmentation nor canopy closure was a significant predictor of species richness and found no difference between the species richness of fragmented and continuous sites. However, forest fragmentation was a strong predictor of abundance, occurring in 31 of 31 general linear mixed models, with higher abundance in fragmented forest than in continuous forest. Of 16 species found, eight occurred at five or more sites and one (Pseudochalceus boehlkei), numbered 200 out of 627 individuals. NMDS and SIMPER analysis suggested that community composition differed between fragmented and continuous sites. P. boehlkei, Pseudopoecilia fria, and Astroblepus cf. fissidens species presented in higher abundances in deforested sites, possibly suggesting a less functionally diverse community. This pattern is consistent with neotropical streams that have experienced partial deforestation but not total degradation of habitat.

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Environmental correlates of richness, community composition, and functional traits of terrestrial birds and mammals in a fragmented tropical landscape

Cited by 10 publications

References 65 publications

Hummingbird diversity in a fragmented tropical landscape in the Chocó biogeographic zone

Hummingbird diversity in a fragmented tropical landscape in the Chocó biogeographic zone

Spatial Occupancy, Local Abundance and Activity Rhythm of Three Ground Dwelling Columbid Species in the Forests of Guadeloupe in Relation to Environmental Factors

Richness and abundance of stream fish communities in a fragmented neotropical landscape

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