Detecting fragmentation extinction thresholds for forest understory plant species in Peninsular Spain
Entity
UAM. Departamento de BiologíaPublisher
Public Library of ScienceDate
2015-05-15Citation
10.1371/journal.pone.0126424
PLoS ONE 10.5 (2015): 0126424
ISSN
1932-6203 (print)DOI
10.1371/journal.pone.0126424Funded by
This study was sponsored by a research grant from the Ministry of Economy and Competitiveness of Spain (CGL2010-22119 to MÁR). MR was funded by the Spanish Ministry for Education and Science (BVA-2010-0596). IM-C was funded by the Integrated Program of IC&DT (No. 1/SAESCTN/ ALENT-07- 0224-FEDER-001755)Project
Gobierno de España. CGL2010-22119; Gobierno de España. BVA-2010-0596Editor's Version
http://dx.doi.org/10.1371/journal.pone.0126424Subjects
Athyrium filix femina; Blechnum spicant; Controlled study; Deschampsia flexuosa; Dryopteris filix mas; Fern; Forest fragmentation; Habitat selection; Hepatica nobilis; Herb; Landscape; Nonhuman; Poa nemoralis; Polystichum aculeatum; Spain; Species extinction; Biología y Biomedicina / BiologíaRights
© 2015 Rueda et al.Abstract
Ecological theory predicts that fragmentation aggravates the effects of habitat loss, yet empirical results show mixed evidences, which fail to support the theory instead reinforcing the primary importance of habitat loss. Fragmentation hypotheses have received much attention due to their potential implications for biodiversity conservation, however, animal studies have traditionally been their main focus. Here we assess variation in species sensitivity to forest amount and fragmentation and evaluate if fragmentation is related to extinction thresholds in forest understory herbs and ferns. Our expectation was that forest herbs would be more sensitive to fragmentation than ferns due to their lower dispersal capabilities. Using forest cover percentage and the proportion of this percentage occurring in the largest patch within UTM cells of 10-km resolution covering Peninsular Spain, we partitioned the effects of forest amount versus fragmentation and applied logistic regression to model occurrences of 16 species. For nine models showing robustness according to a set of quality criteria we subsequently defined two empirical fragmentation scenarios, minimum and maximum, and quantified species' sensitivity to forest contraction with no fragmentation, and to fragmentation under constant forest cover. We finally assessed how the extinction threshold of each species (the habitat amount below which it cannot persist) varies under no and maximum fragmentation. Consistent with their preference for forest habitats probability occurrences of all species decreased as forest cover contracted. On average, herbs did not show significant sensitivity to fragmentation whereas ferns were favored. In line with theory, fragmentation yielded higher extinction thresholds for two species. For the remaining species, fragmentation had either positive or non-significant effects. We interpret these differences as reflecting species-specific traits and conclude that although forest amount is of primary importance for the persistence of understory plants, to neglect the impact of fragmentation for some species can lead them to local extinction
Files in this item
Google Scholar:Rueda, Marta
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Moreno Saiz, Juan Carlos
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Morales-Castilla, Ignacio
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Albuquerque, Fabio S.
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Ferrero, Mila
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Rodríguez, Miguel
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