| Autor: |
Strathdee, A. T.1,2, Bale, J. S.1, Strathdee, F. C., Block, W. C.3, Coulson, S. J.4, Webb, N. R.5, Hodkinson, I. D.4 |
| Předmět: |
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| Zdroj: |
Global Change Biology. Feb1995, Vol. 1 Issue 1, p23-28. 6p. 3 Charts, 4 Graphs. |
| Abstrakt: |
1 Theory suggests that any given rise in temperature resulting from climate change will have its greatest effect on high Arctic ecosystems where growing seasons are short and temperatures low. 2 A small temperature rise, similar to that predicted for the middle of the next century, has profound effects on a population of the high Arctic, Dryas-feeding aphid Acyrthosiphon svalbardicum on Spitsbergen (Strathdee et al. 1993a). 3 Here comparative experiments on a closely related Dryas-feeding species, A. brevicorne, at two contrasting sub-Arctic sites are described. Together with the results from Spitsbergen these sites represent two colder sites (high Arctic and upland sub-Arctic) and one warmer site (lowland sub-Arctic). 4 Differential responses in aphid population density and overwintering egg production to temperature elevation support the hypothesis that the ecological effects are greatest at sites with the most severe climates; however, there is no similar gradient in advancement of host plant phenology with warming. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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