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pro vyhledávání: '"Thomas R. Haglund"'
Publikováno v:
Environmental Biology of Fishes. 87:321-332
Habitat degradation affects native stream fish populations worldwide. We examined the impact of fluctuation in environmental variables on the population dynamics of the federally threatened Santa Ana sucker, Catostomus santaanae, in the Santa Ana Riv
Publikováno v:
Biochemical Systematics and Ecology. 18:559-563
An undescribed form of Gasterosteus (the “white stickleback”) is sympatric with Gasterosteus aculeatus in Nova Scotia. Allozyme products of 19 presumptive loci were examined via starch gel electrophoresis for two geographic samples of G. aculeatu
Publikováno v:
Copeia. 1992:935
The allotetraploid catostomid fish, Catostomus tahoensis and the endangered Chasmistes cujus, from Pyramid Lake, Nevada, were examined electrophoretically for duplicate gene expression and allozyme variation. Both species resemble other advanced cato
Publikováno v:
Copeia. 1992:432
gastropod-eating snake genera, Tropidodipsas and Sibon. J. Herp. 19:84-92. 1. 1990. Systematics of Neotropical gastropodeating snakes: the dimidiata group of the genus Sibon, with comments on the nebulata group. Amphibia-Reptilia 11:207-223. LEVITON,
Autor:
Thomas R. Haglund, Michael A. Bell
Publikováno v:
Paleobiology. 8:282-292
The fossil stickleback, Gasterosteus doryssus, is highly variable for pelvic girdle structure and the number of dorsal spines. Six “sampling pits” were dug at known stratigraphic positions within a continuous section which contains abundant G. do
Autor:
Thomas R. Haglund, Michael A. Bell
Publikováno v:
Evolution. 32:304-319
Natural selection operates through the differential survival and reproduction of alternative phenotypes within a population. When a population is composed of two or more phenotypes that are specified by different genotypes, natural selection may oper