| old mice, young islands and competing biogeographical hypotheses. | naturally occurring variation within a small rodent species native to the southeastern usa, peromyscus polionotus, has interested biologists for nearly a century. this species has contributed significantly to our understanding of geographical variation and has often been presented as an example of adaptive evolution. much of the interest in this organism has been predicated on assumptions that the species is relatively young (<300 000 bp) and that coastal populations have a very recent history ( ... | 2007 | 17956552 |
| natural selection along an environmental gradient: a classic cline in mouse pigmentation. | we revisited a classic study of morphological variation in the oldfield mouse (peromyscus polionotus) to estimate the strength of selection acting on pigmentation patterns and to identify the underlying genes. we measured 215 specimens collected by francis sumner in the 1920s from eight populations across a 155-km, environmentally variable transect from the white sands of florida's gulf coast to the dark, loamy soil of southeastern alabama. like sumner, we found significant variation among popul ... | 2008 | 18489719 |
| a review of gongylonema spp. (nematoda: gongylonematidae) in north american rodents with description of a new species from the cotton rat, sigmodon hispidus (mammalia: cricetidae). | gongylonema archboldi n. sp. (nematoda: gongylonematidae) is described from tunnels in the gastric mucosa of the stomach of the cotton rat (sigmodon hispidus) from highlands county, florida, u.s.a. measurements are also given for specimens from cotton mice (peromyscus gossypinus), oldfield mice (peromyscus polionotus), florida mice (podomys floridanus), and golden mice (ochrotomys nuttalli) from the same locality. additional specimens were collected from the cotton rat and the rice rat (oryzomys ... | 2016 | 27394819 |
| the genetic basis of phenotypic convergence in beach mice: similar pigment patterns but different genes. | convergent evolution is a widespread phenomenon seen in diverse organisms inhabiting similar selective environments. however, it is unclear if similar phenotypes are produced by the same or different genes and mutations. here we analyze the molecular mechanisms underlying convergent pigment pattern among subspecies of the beach mouse (peromyscus polionotus) inhabiting the gulf and atlantic coasts of florida. in these two geographic regions, separated by more than 300 km, "beach mice" have lighte ... | 2009 | 18832078 |
| evidence of adaptation from ancestral variation in young populations of beach mice. | to understand how organisms adapt to novel habitats, which involves both demographic and selective events, we require knowledge of the evolutionary history of populations and also selected alleles. there are still few cases in which the precise mutations (and hence, defined alleles) that contribute to adaptive change have been identified in nature; one exception is the genetic basis of camouflaging pigmentation of oldfield mice (peromyscus polionotus) that have colonized the sandy dunes of flori ... | 2012 | 23025610 |
| long overlooked historical information on agent orange and tcdd following massive applications of 2,4,5-t-containing herbicides, eglin air force base, florida. | from 1961-1971, the air development test center, eglin air force base (afb), florida, developed, tested, and calibrated the aerial spray systems used in support of operation ranch hand and the us army chemical corps in vietnam. twenty major test and evaluation projects of aerial spray equipment were conducted on four fully instrumented test grids, each uniquely arrayed to match the needs of fixed-wing, helicopter, or jet aircraft. each of the grids was established within the boundary of test are ... | 2004 | 15341310 |