Rethinking patch size and isolation effects: the habitat amount hypothesis

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SYNTHESIS Rethinking patch size and isolation effects: the habitat amount hypothesis

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 hypothes...

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Habitat amount modulates the effect of patch isolation on host-parasitoid interactions

*Correspondence: Valérie Coudrain, Research Center Agroscope, Reckenholzstrasse 191, 8046 Zürich, Switzerland e-mail: [email protected] Habitat amount and patch isolation are important determinants of biodiversity and ecosystem functioning. We studied the separate and interactive effects of these two components of habitat fragmentation on host-parasitoid interactions in a replicated landscape...

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Patch Size and Connectivity Thresholds for Butterfly Habitat Restoration

Recovery of endangered species in highly fragmented habitats often requires habitat restoration. Selection of restoration sites typically involves too many options and too much uncertainty to reach a decision based on existing reserve design methods. The Fender’s blue butterfly ( Icaricia icarioides fenderi) survives in small, isolated patches of remnant prairie in Oregon’s Willamette Valley—a ...

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Habitat Fragmentation, Variable Edge Effects, and the Landscape-Divergence Hypothesis

Edge effects are major drivers of change in many fragmented landscapes, but are often highly variable in space and time. Here we assess variability in edge effects altering Amazon forest dynamics, plant community composition, invading species, and carbon storage, in the world's largest and longest-running experimental study of habitat fragmentation. Despite detailed knowledge of local landscape...

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Predicting immigration of two species in contrasting landscapes: effects of scale, patch size and isolation

Migration is a key process for spatially structured populations. We examined how a variety of patch based metrics commonly used to predict the number of immigrants to a habitat patch performed based on data from three different years, in two distinct insect systems. The first system was an herbivorous beetle inhabiting patches of its host plant within a ‘typical’ patch network. In this system t...

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ژورنال

عنوان ژورنال: Journal of Biogeography

سال: 2013

ISSN: 0305-0270

DOI: 10.1111/jbi.12130