Drivers of bird beta diversity in the Western Ghats–Sri Lanka biodiversity hotspot are scale dependent: roles of land use, climate, and distance

Sreekar, Rachakonda; Koh, Lian Pin; Mammides, Christos; Corlett, Richard T.; Dayananda, Salindra K.; Goodale, Uromi Manage; Kotagama, Sarath W.; Goodale, Eben

doi:10.1007/s00442-020-04671-3

Cited by 8 publications

(6 citation statements)

References 44 publications

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“…From these studies it was realized that the most probable cause for this loss and biodiversity simplification is reduced food availability and decreased niche availability by habitat fragmentation, for example, with detrimental effects on ground-dwelling carabids (Hendrickx et al, 2009). Drivers of community assembly are scale dependent and can change with spatial scales (Lindo and Winchester, 2008;Li et al, 2020;Sreekar et al, 2020). Previous studies demonstrated that only limited to single scale may lead to biased conclusions (Sasaki and Yoshihara, 2013;Banaszak-Cibicka and Żmihorski, 2020) and studies at both local and regional scales allow researchers to identify the most important processes operating across multiple spatial scales (Benocci et al, 2015;Hamaoka et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Contrasting beta diversity of spiders, carabids, and ants at local and regional scales in a black soil region, northeast China

et al. 2021

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Understanding the factors determining the formation of each community and metacommunity across a landscape is one of the most important ideas in soil animal ecology. However, the variables and parameters that shape soil arthropod communities in agroecosystems have not been resolved. These arthropods can serve as important bioindicators of field management and its sustainability. We sampled five corn plantations in each of three locations across a region spanning 600 km to come up with these determinants of the community structure of ground-dwelling spiders (Erigoninae: Araneae), carabids (Coleoptera: Carabidae), and ants (Hymenoptera: Formicidae). The analysis of the five fields within each of the three locations represent our local-scale samples, while the comparisons of the 15 sites across all three locations represent the regional scale samples. We tested the hypothesis that in the models we sampled, environmental/soil variables would drive

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Section: Introductionmentioning

confidence: 99%

Contrasting beta diversity of spiders, carabids, and ants at local and regional scales in a black soil region, northeast China

et al. 2021

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“…Geographic distance shapes regional composition patterns across communities (neutral‐based processes). Equally, environmental differences operate mostly at local scales (Karp et al, 2012) because longer and steeper environmental gradients allow a more marked sorting of species by their different preferences (Trujillo et al, 2019), even across human‐modified landscapes (Du et al, 2021; Sreekar et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Neutral‐based processes overrule niche‐based processes in shaping tropical montane orchid communities across spatial scales

2023

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Tropical montane forests (TMF) are characterised by high endemism, species richness and turnover across elevations. A key question is how niche‐based processes, via adaptation of species to local environmental conditions, and neutral‐based processes from dispersal limitation shape community composition at different spatial scales across human‐modified landscapes. We expect that (1) communities are highly distinct even within the same habitat type and (2) niche‐based processes play the main role in compositional turnover. To address these expectations, we investigated the compositional turnover of orchids, one of the most prominent floristic elements of TMFs. We sampled orchids in 332 plots spanning over 270 km in the eastern Colombian Andes. Plots ranged between elevations of 1160–3750 m. We used two different spatial extents (whole gradient and two elevational bands), two grains of analysis for the first expectation (regional and local) and two spatial grains for the second expectation (broad and fine scales based on Moran's Eigenvector Maps [MEMs]). We found 331 orchid species in 171 (51%) plots. We found a strong pattern of high compositional turnover across scales (>72% of total beta diversity is given by species turnover), with 87.5% of the total species pool occurring in fewer than five plots, supporting our first expectation. Contrary to our second expectation, we found that community composition is mainly driven by geographical distance, while the relative influence of elevation, environmental variables and their combined fractions were negligible across habitats and spatial scales, rejecting niche‐based processes. Synthesis. High compositional turnover, even across habitats with the highest degree of human intervention, suggests that both forest‐dwelling and open‐habitat species do not easily disperse across habitats. Species dispersal is the major force of orchid community turnover and might be strongly dependent upon macroevolutionary processes and species life‐history traits over multiple scales. Dispersal limitation also draws attention to the importance of preserving habitat connectivity to halt biodiversity losses.

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“…Additionally, most studies on biotic turnover have been conducted locally [23,24]. A few studies investigated biotic turnover on large geographic scales, but they mostly focused on plants, birds and mammals [25,26]. The global biogeography of soil fauna has gained attention only recently [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Environmental Effects on Taxonomic Turnover in Soil Fauna across Multiple Forest Ecosystems in East Asia

Zhang

Ding

et al. 2022

Insects

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The large-scale spatial variation in and causes of biotic turnover of soil fauna remain poorly understood. Analyses were conducted based on published data from 14 independent sampling sites across five forest ecosystems in East Asia. Jaccard and Sørensen’s indices were used to measure turnover rates in soil fauna orders. A redundancy analysis was used to investigate multiple environmental controls of the composition of soil fauna communities. The results showed that both Jaccard’s and Sørensen’s index increased significantly with increasing latitude difference. The environment explained 54.1%, 50.6%, 57.3% and 50.9% of the total variance, and spatial factors explained 13.8%, 15.9%, 21.0% and 12.6% of the total variance in the orders’ composition regarding overall, phytophagous, predatory and saprophagous fauna, respectively. In addition, climate factors in environmental processes were observed to have a stronger effect than soil factors on the orders’ turnover rates. Our results support the hypothesis that the effect of environment factors on soil animal taxa turnover is more important than the effect of spatial factors. Climatic factors explained more variation in the turnover of phytophagic fauna, but soil and environment factors equally explained the variation in the turnover of predatory fauna. This study provides evidence to support both environmental filtering and dispersal limitation hypotheses at the regional and population scales.

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Drivers of bird beta diversity in the Western Ghats–Sri Lanka biodiversity hotspot are scale dependent: roles of land use, climate, and distance

Cited by 8 publications

References 44 publications

Contrasting beta diversity of spiders, carabids, and ants at local and regional scales in a black soil region, northeast China

Contrasting beta diversity of spiders, carabids, and ants at local and regional scales in a black soil region, northeast China

Neutral‐based processes overrule niche‐based processes in shaping tropical montane orchid communities across spatial scales

Environmental Effects on Taxonomic Turnover in Soil Fauna across Multiple Forest Ecosystems in East Asia

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