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Titolo:
Ecological patterns of body-size and clutch-size variation in the parthenogenetic teiid lizard Cnemidophorus tesselatus
Autore:
Taylor, HL; Walker, JM; Cordes, JE;
Indirizzi:
Regis Univ, Dept Biol, Denver, CO 80221 USA Regis Univ Denver CO USA 80221 egis Univ, Dept Biol, Denver, CO 80221 USA Univ Arkansas, Dept Biol Sci, Fayetteville, AR 72701 USA Univ Arkansas Fayetteville AR USA 72701 l Sci, Fayetteville, AR 72701 USA Louisiana State Univ, Div Sci, Eunice, LA 70535 USA Louisiana State Univ Eunice LA USA 70535 v, Div Sci, Eunice, LA 70535 USA
Titolo Testata:
HERPETOLOGICA
fascicolo: 1, volume: 56, anno: 2000,
pagine: 45 - 54
SICI:
0018-0831(200003)56:1<45:EPOBAC>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHARACTER DISPLACEMENT; WHIPTAIL LIZARDS; NEOMEXICANUS; LAREDOENSIS; DIVERSITY; COMPLEX; ORIGIN; CLONES; SAURIA;
Keywords:
reptilia; squamata; Cnemidophorus tesselatus; color pattern classes; evolution; geographic variation; parthenogenesis; reproductive strategy; clutch size; general-purpose genotype hypothesis; ecology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Taylor, HL Regis Univ, Dept Biol, Denver, CO 80221 USA Regis Univ Denver CO USA 80221 Dept Biol, Denver, CO 80221 USA
Citazione:
H.L. Taylor et al., "Ecological patterns of body-size and clutch-size variation in the parthenogenetic teiid lizard Cnemidophorus tesselatus", HERPETOLOGI, 56(1), 2000, pp. 45-54

Abstract

Pattern class C of parthenogenetic Cnemidophorus tesselatus reaches its southern range limit at Sumner Lake State Park, De Baca County, New Mexico, where it is syntopic at several sites with a northern population of pattern class E of the same species. Samples collected at Sumner Lake in 1997 confirmed significant differences between the two pattern classes in body lengthand clutch size initially observed in samples collected in 1995 and 1996. In contrast, these characteristics were non-significantly different in pattern classes C and Colorado D, sympatric (and marginally syntopic) at sites near the historic town-site of Higbee, Otero County, Colorado. The difference between each pair of sympatric pattern classes is based on different mean body sizes and a positive relationship between clutch size and body size in C, tesselatus. A comparison of 10 samples of three color pattern classesof C. tesselatus, spanning approximately 1100 km of latitudinal range, revealed that the small clutch size characterizing pattern class E at Sumner Lake was found in other populations of pattern class E and in one populationof pattern class C as well. Similarly, the larger clutch size of pattern class C at Sumner Lake was found in die Higbee population of pattern class Cand in some populations of pattern class E. Therefore, despite constraintson variability predicted from a parthenogenetic reproductive mode, reproductive characteristics are remarkably variable both within and between pattern classes. In the absence of conclusive evidence of more than one hybridization event in the origin of C. tesselatus and the geographic proximity of only pattern class E to the progenitor species, we hypothesize, from color pattern and meristic evidence, that pattern class C was most likely derivedfrom one or more E-like individuals, and that pattern classes New Mexico Dand Colorado D were derived from individuals of pattern class C. Mutationscould also have modified reproductive characteristics permitting C. tesselatus to expand its distribution beyond that available to a general-purpose genotype derived from the progenitor species C. tigris marmoratus and C. gularis septemvittatus and expressed in pattern class E. In addition to its extensive geographic range; the ecological success of C. tesselatus can be gauged by the fact that nine of our 10 samples of C. tesselatus were from populations sympatric with 1-3 sexual species and 1-2 parthenogenetic speciesof Cnemidophorus.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 05:25:33