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- Hambäck, Peter, et al.
(författare)
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Habitat specialisation, body-size and family identity explain Lepidopteran density-area relationships in a cross-continental comparison.
- 2007
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. ; 104:20, s. 8368-73
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Tidskriftsartikel (refereegranskat)abstract
- Habitat fragmentation may strongly affect species density, species interactions and the rate of ecosystem processes. It is therefore important to understand the observed variability among species responses to fragmentation, and the underlying mechanisms. In this study, we compare density-area relationships (DAR) for 344 lepidopteran species belonging to 22 families (butterflies and moths). This analysis suggested that the DARslope is generally positive for moths and negative for butterflies. The differences are suggested to occur because moths are largely olfactory searchers, whereas most butterflies are visual searchers. The analysis also suggests that DARs vary as a function of habitat specialisation and body size. In butterflies, generalist species had a more negative DARslope than specialist species because of a lower patch size threshold. In moths, the differences in DARslope between forest and open habitat species were large for small species but absent for large species. This is argued to occur because the DARslope in large species mainly reflect their search mode, which does not necessarily vary between moth groups, whereas the slope in small species reflect population growth rates.
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| 2. |
- Kuussaari, Mikko, et al.
(författare)
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Extinction debt: a challenge for biodiversity conservation
- 2009
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Ingår i: Trends in Ecology & Evolution. - : Elsevier BV. - 0169-5347 .- 1872-8383. ; 24:10, s. 564-571
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Tidskriftsartikel (refereegranskat)abstract
- Local extinction of species can occur with a substantial delay following habitat loss or degradation. Accumulating evidence suggests that such extinction debts pose a significant but often unrecognized challenge for biodiversity conservation across a wide range of taxa and ecosystems. Species with long generation times and populations near their extinction threshold are most likely to have an extinction debt. However, as long as a species that is predicted to become extinct still persists, there is time for conservation measures such as habitat restoration and landscape management. Standardized long-term monitoring, more high-quality empirical studies on different taxa and ecosystems and further development of analytical methods will help to better quantify extinction debt and protect biodiversity.
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