منابع مشابه
Species or supraspecific taxa as terminals in cladistic analysis? Groundplans versus exemplars revisited.
Increasing thenumber of taxa in aphylogenetic analysis can have a profound effect on accuracy (Hendy and Penny, 1989; Wheeler, 1992; Hillis, 1996; Graybeal, 1998; Halanych, 1998; Soltis et al., 1998; but see alsoKim, 1996; Poe and Swofford, 1999). Although including all ormost constituent species in analyses attempting to resolve relationships among higher taxa is desirable, it may be impractic...
متن کاملShortcuts in biodiversity research: What determines the performance of higher taxa as surrogates for species?
Biodiversity research is often impeded by the time and resources required to identify species. One possible solution is to use higher taxa to predict species richness and community composition. However, previous studies have shown that the performance of higher taxa as surrogates for species is highly variable, making it difficult to predict whether the method will be reliable for a particular ...
متن کاملDarwin's diagram of divergence of taxa as a causal model for the origin of species.
On the basis that Darwin's theory of evolution encompasses two logically independent processes (common descent and natural selection), the only figure in On the Origin of Species (the Diagram of Divergence of Taxa) is often interpreted as illustrative of only one of these processes: the branching patterns representing common ancestry. Here, I argue that Darwin's Diagram of Divergence of Taxa re...
متن کاملEnvironmental heterogeneity as a universal driver of species richness across taxa, biomes and spatial scales.
Environmental heterogeneity is regarded as one of the most important factors governing species richness gradients. An increase in available niche space, provision of refuges and opportunities for isolation and divergent adaptation are thought to enhance species coexistence, persistence and diversification. However, the extent and generality of positive heterogeneity-richness relationships are s...
متن کاملRanked species occupancy curves reveal common patterns among diverse metacommunities
Aim Community ecologists often compare assemblages. Alternatively, one may compare species distributions among assemblages for macroecological comparisons of species niche traits and dispersal abilities, which are consistent with metacommunity theory and a regional community concept. The aim of this metaanalysis is to use regressions of ranked species occupancy curves (RSOCs) among diverse meta...
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ژورنال
عنوان ژورنال: Systematic Biology
سال: 2009
ISSN: 1076-836X,1063-5157
DOI: 10.1093/sysbio/syp011