Explaining the latitudinal gradient anomaly in ichneumonid species richness: evidence from butterflies
نویسندگان
چکیده
منابع مشابه
Latitudinal gradient in species richness
What is the gradient? Amongst the earliest remarked, and best documented, of broad-scale spatial patterns of life on Earth is a trend for more species to be found towards lower latitudes. The latitudinal gradient in species richness is such that most extant eukaryote, perhaps also prokaryote, species are found in the tropics. Even when counted over quite small areas in which it is present, the ...
متن کاملTesting a mechanistic explanation for the latitudinal gradient in mammalian species richness across North America
Hypothesis: Spatial variation in species richness is caused by increased maintenance metabolic costs that increase habitat overlap and decrease species richness. Organisms: Non-volant mammals in North America. Results: The latitudinal gradient in species richness could be completely explained by variation in maintenance metabolic costs. Additional spatial variation in species richness was posit...
متن کاملThe latitudinal species richness gradient in New World woody angiosperms is consistent with the tropical conservatism hypothesis.
Plant diversity, like that of most other taxonomic groups, peaks in the tropics, where climatic conditions are warm and wet, and it declines toward the temperate and polar zones as conditions become colder and drier, with more seasonally variable temperatures. Climate and evolutionary history are often considered competing explanations for the latitudinal gradient, but they are linked by the ev...
متن کاملThe latitudinal gradient in niche breadth: concepts and evidence.
We examine Robert MacArthur's hypothesis that niche breadth is positively associated with latitude (the latitude-niche breadth hypothesis). This idea has been influential and long standing, yet no studies have evaluated its generality or the validity of its assumptions. We review the theoretical arguments suggesting a positive relationship between niche breadth and latitude. We also use availab...
متن کاملExplaining latitudinal diversity gradients.
DIFFERENCES IN MEASURED RATES OF SPECIation and extinction among living species are commonly used to explain latitudinal diversity gradients. The logic is straightforward: the higher the net diversification rate (the difference between the speciation and extinction rate), the greater the number of species. In this vein, J. T. Weir and D. Schluter conclude from their recent study of birds and ma...
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ژورنال
عنوان ژورنال: Journal of Animal Ecology
سال: 1998
ISSN: 0021-8790,1365-2656
DOI: 10.1046/j.1365-2656.1998.00198.x