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Titolo:
Skeletochronology and geographic variation in age structure in the wood frog, Rana sylvatica
Autore:
Sagor, ES; Ouellet, M; Barten, E; Green, DM;
Indirizzi:
McGill Univ, Redpath Museum, Montreal, PQ H3A 2K6, Canada McGill Univ Montreal PQ Canada H3A 2K6 seum, Montreal, PQ H3A 2K6, Canada
Titolo Testata:
JOURNAL OF HERPETOLOGY
fascicolo: 4, volume: 32, anno: 1998,
pagine: 469 - 474
SICI:
0022-1511(199812)32:4<469:SAGVIA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIFE-HISTORY TRAITS; BUFO-BUFO; GROWTH; AMPHIBIANS; MATURITY; ANURA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Green, DM McGilladaiv, Redpath Museum, 859 Sherbrooke St W, Montreal, PQ H3A 2K6, Can McGill Univ 859 Sherbrooke St W Montreal PQ Canada H3A 2K6 , Can
Citazione:
E.S. Sagor et al., "Skeletochronology and geographic variation in age structure in the wood frog, Rana sylvatica", J HERPETOL, 32(4), 1998, pp. 469-474

Abstract

Age structure of a breeding population of Rana sylvatica from southwesternQuebec, Canada, is described based on the enumeration and analysis of Lines of Arrested Growth (LAGs) in phalanges Analyzed using skeletochronology, ages ranged from 1-4 yr among 98 males and from 2-4 yr among 33 females. Females were on average slightly older than males, but the difference was notsignificant Mean snout-vent length was 43.6 mm +/- 2.0 (SD) among 179 males and 48.8 mm +/- 27 among 33 females; the difference between the sexes wassignificant Endosteal resorption completely destroyed LAG 1 in 6.1% of frogs, about twice as frequently in males as in females. A minimum of three LAG enumeration readings by two observers differed for 24.4% of preparations and independent readings by the same observer differed for 15.3% of preparations, highlighting the importance of reducing subjectivity in skeletochronological analyses. This was accomplished, in part, by plotting LAG diameters on a histogram whereby outliers from an expected normal distribution indicated loss of inner LAGs via endosteal resorption. Consistent with predictions regarding environmental influences on anuran populations, southern Quebec R. sylvatica matured later and were larger than more southerly conspecifics from a low-elevation area, but matured earlier and were smaller than southerly frogs from a high-elevation area.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 07:55:49