Topography and soil type are critical to understanding how bird and herpetofaunal communities persist in forest fragments of tropical China

Dayananda, Salindra K.; Mammides, Christos; Lee, Myung Bok; Liu, Jiajia; Pasion, Bonifacio O.; Sreekar, Rachakonda; Yasuda, Mika; Quan, Rui‐Chang; Slik, J. W. Ferry; Tomlinson, Kyle W.; Goodale, Eben

doi:10.1016/j.biocon.2017.08.034

Cited by 17 publications

(12 citation statements)

References 47 publications

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“…Furthermore, there is a wealth of research using stable isotopes to answer different questions about these two taxa (e.g., Inger and Bearhop, 2008;Araújo et al, 2009;Smith et al, 2017). While birds and frogs certainly are different (frogs would be less mobile and to some extent more specialized than birds, at least in relation to habitat use, due to their dependency from water) (e.g., Dayananda et al, 2017), we confirmed the consistency of our hypotheses by pooling together data from both taxa. To compute niche characteristics we used stable isotopes, which has become a common technique to quantify trophic niche (Layman et al, 2012;Figgener et al, 2019).…”

Section: Introductionsupporting

confidence: 75%

How to Become a Generalist Species? Individual Niche Variation Across Habitat Transformation Gradients

et al. 2020

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Species in transformed habitats, frequently labeled as environmental generalists, tend to show broader niches than species in natural habitats. However, how population niche expansion translates into changes in the niches of individual organisms remains unclear, particularly in the context of habitat transformation. Niche expansion could be a product of individuals having broader niches, greater distances among individuals’ niches, or a combination of both processes. This would challenge the traditional conceptions on niche dynamics, which emphasize the role played by individual specialization (IS). Here, using stable isotopes, we computed total niche width (TNW), its within- and between-individual components (WIC and BIC), and IS (the ratio WIC/TNW), in 13 populations of 6 bird species and 8 populations of 3 frog species in natural and transformed habitats. We confirmed that species had broader niche width in transformed than in natural habitats, yet population niche expansion across habitats was mainly a product of increased distance between individuals. Within each habitat type, increases in TNW were linked to increases in WIC for all habitat types, while relationships between TNW and BIC were found in transformed but not in natural habitats. Hence, both increased individual niche width and increased distance among individuals were apparent within habitats, particularly in transformed ones, where increases in WIC dominated. Neither across or within habitats was niche expansion associated with increasing IS. Therefore, our results overturn traditional conceptions associated with the niche variation hypothesis and illustrate that niche expansion is not invariably associated with increased IS, because the distance between individual’s niches (BIC) can increase, as well as the breadth of those niches (WIC).

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Section: Introductionsupporting

confidence: 75%

How to Become a Generalist Species? Individual Niche Variation Across Habitat Transformation Gradients

et al. 2020

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“…In tropical southern China, Dayananda et al. (2017) found that area‐standardized bird species richness increased with increasing rainforest fragment size (0.1–13,873 ha), but only in valleys, and not on slopes or ridges. In the neotropics, positive correlations of area‐standardized richness with increased fragment size (from a few to > 100,000 ha) were also reported by Lees and Peres (2006) and Arriaga‐Weiss, Calmé, and Kampichler (2008).…”

Section: Discussionmentioning

confidence: 99%

Effects of habitat transitions on rainforest bird communities across an anthropogenic landscape mosaic

Huang

Catterall

2020

Biotropica

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We compared bird community responses to the habitat transitions of rainforest‐to‐pasture conversion, consequent habitat fragmentation, and post‐agricultural regeneration, across a landscape mosaic of about 600 km2 in the eastern Australian subtropics. Birds were surveyed in seven habitats: continuous mature rainforest; two size classes of mature rainforest fragment (4–21 ha and 1–3 ha); regrowth forest patches dominated by a non‐native tree (2–20 ha, 30–50 years old); two types of isolated mature trees in pasture; and treeless pasture, with six sites per habitat. We compared the avifauna among habitats and among sites, at the levels of species, functional guilds, and community‐wide. Community‐wide species richness and abundance of birds in pasture sites were about one‐fifth and one‐third, respectively, of their values in mature rainforest (irrespective of patch size). Many measured attributes changed progressively across a gradient of increased habitat simplification. Rainforest specialists became less common and less diverse with decreased habitat patch size and vegetation maturity. However, even rainforest fragments of 1–3 ha supported about half of these species. Forest generalist species were largely insensitive to patch size and successional stage. Few species reached their greatest abundance in either small rainforest fragments or regrowth. All pastures were dominated by bird species whose typical native habitats were grassland, wetland, and open eucalypt forest, while pasture trees modestly enhanced local bird communities. Overall, even small scattered patches of mature and regrowth forest contributed substantial bird diversity to local landscapes. Therefore, maximizing the aggregate rainforest area is a useful regional conservation strategy.

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“…Few research articles on fragmentation at sites other than our own (i.e. 52 , 53 ) have assessed whether there is more than one community type present in the landscape under consideration. One study in the fragmented forest landscape in Chiapas 18 , Mexico, observed that tree diversity responses to forest fragmentation were only detectable within community types and not across the entire landscape.…”

Section: Discussionmentioning

confidence: 99%

Trees represent community composition of other plant life-forms, but not their diversity, abundance or responses to fragmentation

Pasion

Roeder

Liu

et al. 2018

Sci Rep

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Our understanding of the patterns of plant diversity in tropical forests and their responses to fragmentation are mostly based on tree surveys. But are these patterns and responses representative of other plant life-forms? We sampled trees, lianas, herbs, and ferns in a fragmented tropical forest landscape in South-west China. We compared community types generated by clustering presence-absence data for the non-tree life-forms with those generated for trees. We tested how well measures of tree diversity, density and composition, predicted cognate indices in other life-forms. We compared fragmentation responses, with respect to the three measures, of all four life-forms. Presence-absence data from all life-forms generated three community clusters, with only small differences between classifications, suggesting that tree data identified community types representative of all vascular plant life-forms. Tree species diversity and density indices poorly predicted cognate indices of lianas and ferns, but represented herbs well. However, the slopes of these relationships differed substantially between community types. All life-forms responded to fragmentation variables but their responses did not consistently match with responses of trees. Plot-level tree data can identify vegetation community types, but is poorly representative of the richness and density of other life-forms, and poorly represents forest fragmentation responses for the entire plant community.

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Topography and soil type are critical to understanding how bird and herpetofaunal communities persist in forest fragments of tropical China

Cited by 17 publications

References 47 publications

How to Become a Generalist Species? Individual Niche Variation Across Habitat Transformation Gradients

How to Become a Generalist Species? Individual Niche Variation Across Habitat Transformation Gradients

Effects of habitat transitions on rainforest bird communities across an anthropogenic landscape mosaic

Trees represent community composition of other plant life-forms, but not their diversity, abundance or responses to fragmentation

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