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Rethinking patch size and isolation effects: the habitat amount hypothesis

Journal of biogeography, 2013-09, Vol.40 (9), p.1649-1663 [Peer Reviewed Journal]

Copyright © 2013 John Wiley & Sons Ltd. ;2013 John Wiley & Sons Ltd ;2014 INIST-CNRS ;Copyright © 2013 John Wiley & Sons Ltd ;ISSN: 0305-0270 ;EISSN: 1365-2699 ;DOI: 10.1111/jbi.12130 ;CODEN: JBIODN

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Title:
Rethinking patch size and isolation effects: the habitat amount hypothesis
Author: Fahrig, Lenore
Triantis, Kostas ; Triantis, Kostas
Subjects: Animal and plant ecology ; Animal, plant and microbial ecology ; Applied ecology ; Biogeography ; Biological and medical sciences ; Conservation biology ; Conservation, protection and management of environment and wildlife ; Edge effect ; Environmental degradation: ecosystems survey and restoration ; Forest habitats ; Fundamental and applied biological sciences. Psychology ; General aspects ; Habitat conservation ; Habitat fragmentation ; Habitat loss ; Habitats ; Hypotheses ; Landscapes ; local landscape ; local patch ; matrix quality ; nested subsets ; SLOSS ; Species ; species accumulation curve ; species-area relationship ; Synecology ; SYNTHESIS ; Wildlife habitats
Is Part Of: Journal of biogeography, 2013-09, Vol.40 (9), p.1649-1663
Description: I challenge (1) the assumption that habitat patches are natural units of measurement for species richness, and (2) the assumption of distinct effects of habitat patch size and isolation on species richness. I propose a simpler view of the relationship between habitat distribution and species richness, the 'habitat amount hypothesis', and I suggest ways of testing it. The habitat amount hypothesis posits that, for habitat patches in a matrix of non-habitat, the patch size effect and the patch isolation effect are driven mainly by a single underlying process, the sample area effect. The hypothesis predicts that species richness in equal-sized sample sites should increase with the total amount of habitat in the 'local landscape' of the sample site, where the local landscape is the area within an appropriate distance of the sample site. It also predicts that species richness in a sample site is independent of the area of the particular patch in which the sample site is located (its 'local patch'), except insofar as the area of that patch contributes to the amount of habitat in the local landscape of the sample site. The habitat amount hypothesis replaces two predictor variables, patch size and isolation, with a single predictor variable, habitat amount, when species richness is analysed for equal-sized sample sites rather than for unequal-sized habitat patches. Studies to test the hypothesis should ensure that 'habitat' is correctly defined, and the spatial extent of the local landscape is appropriate, for the species group under consideration. If supported, the habitat amount hypothesis would mean that to predict the relationship between habitat distribution and species richness: (1) distinguishing between patch-scale and landscape-scale habitat effects is unnecessary; (2) distinguishing between patch size effects and patch isolation effects is unnecessary; (3) considering habitat configuration independent of habitat amount is unnecessary; and (4) delineating discrete habitat patches is unnecessary.
Publisher: Oxford: Blackwell Publishing Ltd
Language: English
Identifier: ISSN: 0305-0270
EISSN: 1365-2699
DOI: 10.1111/jbi.12130
CODEN: JBIODN
Source: Alma/SFX Local Collection

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Rethinking patch size and isolation effects: the habitat amount hypothesis

Copyright © 2013 John Wiley & Sons Ltd. ;2013 John Wiley & Sons Ltd ;2014 INIST-CNRS ;Copyright © 2013 John Wiley & Sons Ltd ;ISSN: 0305-0270 ;EISSN: 1365-2699 ;DOI: 10.1111/jbi.12130 ;CODEN: JBIODN

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