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Wallace and the species concept of the early Darwinians.
- Environmental Science, Biology
- 2008
A lack of agreement in the species concepts of taxonomists is leading to an unprecedented level of taxonomic instability, and disagreements spill over into human affairs and cause practical problems in conservation.
Running title: Species and ConservationVersion: 24 January 1996
- Biology
- 2017
It is argued that species are best defined as genotypic clusters that are distinguishable from other such clusters when they overlap, and that the term species expresses something universal and practical that enables the different fields of biology to speak to each other.
Parallel speciation, despeciation and respeciation: implications for species definition
- Environmental Science
- 2002
The ideas I discuss in this paper are not necessarily new, but many fish biologists, like myself, may not have found any particular reason to consider them until recently.
The General Lineage Concept of Species, Species Criteria, and the Process of Speciation
- Biology, Environmental Science
- 1998
This chapter provides a general theoretical context that accounts for both the unity and the diversity of ideas represented by alternative species definitions, and proposes a revised and conceptually unified terminology for the ideas described by contemporary species definitions.
Species Concept in Primates
- Biology, Environmental ScienceAmerican journal of primatology
- 2012
The only proposal to offer a repeatable, falsifiable definition of species is the Phylogenetic Species Concept, which has been criticised for increasing the number of species to be recognised, although it is not clear why this should be a problem.
1 . 1 A Shift in Focus
- Biology
- 2004
The traditional “standard model” of speciation rests on the assumption of geographic isolation, but the distinction between allopatric speciation (occurring under geographic isolation) and sympatricSpeciation (without geographic isolation), which has taken center stage in the speciation debate.
What Is Speciation and How Should We Study It?
- BiologyThe American Naturalist
- 2004
A new and very different research program is needed to understand the ecological and evolutionary processes that split an ancestral species into new allopatric lineages, and will connect speciation to many other fundamental questions in evolutionary biology, ecology, biogeography, and conservation biology.
Hybridization, ecological races and the nature of species: empirical evidence for the ease of speciation
- BiologyPhilosophical Transactions of the Royal Society B: Biological Sciences
- 2008
It is shown how recent genetic studies of supposedly well-behaved animals, including the authors' own species, have supported the existence of the Darwinian continuum between varieties and species, which provides good evidence for gradual evolution of species from ecological races and biotypes, to hybridizing species and, ultimately, to species that no longer cross.
Biodiversity and the Species Concept-Lineages are not Enough.
- BiologySystematic biology
- 2017
Viewing species as historically connected populations with unique role brings together the temporal and phenotypic natures of species, providing a clear way to view species both in a time-limited and time-extended way.
References
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To-day I shall try to discuss, as taxonomist and zoogeographer, some such questions relating to speciation in birds.
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It is argued that drawing the divide between species and higher taxa along such lines has not been successful and that such a distinction is more subtle than many authors have claimed.
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A set of problems with data on mitochondrial DNA sequences and both nuclear sequences and allozyme electromorphs for sets of populations of two currently recognized species of pocket gophers, Thomomys bottae and T. townsendii in the western United States is illustrated.
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The Effects of Rare but Promiscuous Genetic Exchange on Evolutionary Divergence in Prokaryotes
- Biology, Environmental ScienceThe American Naturalist
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I have investigated the determinants of genetic divergence within a metapopulation of bacterial populations, in which each constituent population is adapted to a different ecological niche and…
Applications of mitochondrial DNA analysis in conservation: a critical review
- Environmental Science, Biology
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There are some relatively straightforward uses of mtDNA, preferably in conjunction with assays of nuclear variation, that can make a significant contribution to the long‐term planning and short‐term execution of species recovery plans.