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Past and present effects of habitat amount and fragmentation per se on plant species richness, composition and traits in a deforestation hotspot



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Herrero-Jáuregui, Cristina and Camba Sans, Gonzalo and Andries Margian, Delia M. and Aguiar, Sebastián and Fahrig, Lenore and Mastrangelo, Matías (2022) Past and present effects of habitat amount and fragmentation per se on plant species richness, composition and traits in a deforestation hotspot. Biological Conservation, 276 (109815). pp. 1-14. ISSN 0006-3207, Electronic: 1873-2917

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Official URL: https://doi.org/10.1016/j.biocon.2022.109815


Worldwide, human activities are rapidly changing land cover and its spatial configuration. While it is widely acknowledged that habitat loss is a major cause of biodiversity loss, there is less agreement on how biodiversity responds to changes in habitat configuration. We assessed the effects of forest amount and forest fragmentation per se (the number of patches for a given forest amount, an aspect of configuration) on woody species richness, composition, and traits in the Dry Chaco forest, a global deforestation hotspot. We sampled woody plants in 24 forest sites varying in forest amount and fragmentation per se in the surrounding landscapes. Using Generalized Linear Modeling we tested whether a model with just forest amount was at least as able to predict species richness as a model with either patch size or isolation or the combination of both. We also tested whether forest amount and fragmentation per se influenced species richness, composition, and the density of four species traits. Finally, we compared these responses to forest amount and fragmentation per se measured in the past (2009) vs. in the present (2017) to look for time-lagged responses. We found that: 1) in support of the habitat amount hypothesis, species richness was more strongly related to forest amount than to the size and/or isolation of the forest patch containing the sample plot; 2) the positive effect of forest amount on species richness was more important than the effect of fragmentation per se (also positive); 3) fragmentation per se changed species composition such that plots in landscapes with more fragmented forest had species with smaller leaves and seeds, and higher wood density; and 4) species richness showed a time-lagged response to forest amount but not to forest fragmentation per se. Our results suggest that preservation of native Dry Chaco forest should be prioritized regardless of its fragmentation level, for conserving woody plant species diversity.

Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2022)

Uncontrolled Keywords:Habitat amount hypothesis; Chaco; Dry forests; Land use-land cover change; Patch size; Patch isolation; Wood density; Leaf area; Seed weight
Subjects:Medical sciences > Biology > Ecology
Medical sciences > Biology > Environment
ID Code:75786
Deposited On:30 Nov 2022 09:26
Last Modified:30 Nov 2022 12:15

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