Results 121 to 130 of about 131,939 (161)
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Defining and interpreting intraspecific molecular variation
Veterinary Parasitology, 2001Defining the extent and character of intraspecific genetic variation provides important information about gene function and organismal history. Powerful tests may be applied to sequenced alleles in order to critically examine whether natural selection is responsible for limiting or elevating intraspecific polymorphism in particular genes ...
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The uses of intraspecific variation in aging research
Experimental Gerontology, 1996The artificial creation of genetically long-lived populations of several invertebrate species has illustrated how researchers may take advantage of genetic variation within a species to investigate the nature and mechanisms of aging. The advantage of studying intraspecific variation is that populations will be generally similar except for the relevant ...
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Intraspecific Variation in Seed Packaging
American Midland Naturalist, 1990Seed biomass, seed number and biomass of "packaging" (dispersal and protective devices associated with those seeds) were determined for 28 species of flowering plants. Individual variation in average seed packaging investment was marked in almost all species we surveyed. Furthermore, the pattern of biomass investment in dispersal devices and protective
Mary F. Willson +6 more
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Genetic intraspecific variations
2013Certain variable characters are found that are not known to be affected by any environmental condition and are presumably under genetic control. They are of a rather minor nature, and their presence or absence does not obscure the identity of the species.
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Intraspecific variation in primate vocalizations.
The Journal of the Acoustical Society of America, 1996Intraspecific variability in primate vocalizations exists at several levels—within organizational levels of a species, as well as differingly across acoustic variables. This paper reviews signal variability between subspecies, groups and populations, individuals, and within a single individual’s vocalizations.
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Intraspecific Variation in Parasitic Protozoa
Systematic Zoology, 1957I BELIEVE it was the late Dr. N. A. Cobb who once told a group of graduate students, of whom I was one, that it should be a part of the doctoral requirements for each candidate to describe at least one new species. What he had in mind, I am sure, was not simply the discovery of more kinds of living things, nor even the training of biologists versatile ...
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Intraspecific Variation in Dehydration Tolerance
2019This work was made possible through the generous support and funding provided by the University of Kentucky Department of Biology Ribble Endowment (research funding and a graduate fellowship), the American Bryological and Lichenological Society (Anderson and Crum Bryology Research Award and travel funding), the American Botanical Society (a fellowship ...
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Intraspecific Variation in Parasitic Flatworms
Systematic Zoology, 1957AT THE outset of our discussion it 11 would be useful, I believe, to stake out the areas and list the items on which there is general agreement. It is admitted that species exist, and that the species is the basic unit in taxonomy. Further, it is agreed that taxonomy has two primary functions or obligations, one of which is to designate each species in
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Intraspecific Variation in Parasitic Nematodes
Systematic Zoology, 1957THE problems of intraspecific variation in parasitic nematodes are similar to those of the study of other internal parasitic animals, and yet they are in some ways unique. The systematic nematologist rarely has the opportunity to make extensive studies on fresh, unfixed specimens because parasitic nematodes cannot be kept alive and in good condition ...
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Patterns in intraspecific variation in root traits are species‐specific along an elevation gradient
Functional Ecology, 2021Monique Weemstra +2 more
exaly