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Animal species and evolution
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The article was published on 1963-01-01 and is currently open access. It has received 7870 citations till now. The article focuses on the topics: Species problem.read more
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On the Ecological Significance of Bergmann's Rule
TL;DR: A positive correlation of weight with latitude in homoiotherms (Bergmann's rule) cannot normally depend upon the physics of heat exchange, and most latitudinally widespread mammals in North America do not follow this rule.
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Are natural hybrids fit or unfit relative to their parents
TL;DR: Recent analyses have found that hybrids are not uniformly unfit, but rather are genotypic classes that possess lower, equivalent or higher levels of fitness relative to their parental taxa.
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Components of reproductive isolation between the monkeyflowers Mimulus lewisii and M. cardinalis (Phrymaceae)
TL;DR: The results suggest that ecological factors resulting from adaptive divergence are the primary isolating barriers in this system of Mimulus lewisii and M. cardinalis, sister species of monkeyflowers.
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What Can Molecular and Morphological Markers Tell Us About Plant Hybridization
TL;DR: This article examined morphological, chemical, and molecular character expression in hybrid plants to determine whether traditionally recognized properties of hybrid plants, such as hybrid intermediacy and character coherence, are actually supported by empirical evidence, and also examined the impact of hybrids on phylogenetic analyses.
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The biology of speciation.
TL;DR: It is argued that natural selection is a ubiquitous part of speciation, and given the many ways in which stochastic and deterministic factors may interact during divergence, it is questioned whether the ecological speciation concept is useful.