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Titolo:
Morphological abnormality patterns in a California amphibian community
Autore:
Johnson, PTJ; Lunde, KB; Ritchie, EG; Reaser, JK; Launer, AE;
Indirizzi:
Stanford Univ, Dept Biol Sci, Ctr Conservat Biol, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 onservat Biol, Stanford, CA 94305 USA James Cook Univ N Queensland, Dept Zool & Trop Ecol, Townsville, Qld 4811,Australia James Cook Univ N Queensland Townsville Qld Australia 4811 4811,Australia
Titolo Testata:
HERPETOLOGICA
fascicolo: 3, volume: 57, anno: 2001,
pagine: 336 - 352
SICI:
0018-0831(200109)57:3<336:MAPIAC>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEDIMENT EXTRACTS; POND WATER; FROGS; SALAMANDRIDAE; MOSQUITOFISH; DEFORMITIES; MINNESOTA; XENOPUS; LIMBS; USA;
Keywords:
amphibian; abnormality; malformation; deformity; Hyla regilla; Bufo boreas; Taricha torosa; Rana catesbeiana; trematode; Ribeiroia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Johnson, PTJ Claremont McKenna Coll, Roberts Environm Ctr, WM Keck Sci Ctr, 925 N MillsAve, Claremont, CA 91711 USA Claremont McKenna Coll 925 N Mills Ave Claremont CA USA 91711
Citazione:
P.T.J. Johnson et al., "Morphological abnormality patterns in a California amphibian community", HERPETOLOGI, 57(3), 2001, pp. 336-352

Abstract

Increasing reports of amphibian limb malformations from many parts of North America have prompted investigations into the potential causes of these abnormalities and their implications for amphibian populations. Over a two-year period, we monitored the frequency and composition of morphological abnormalities in four amphibian species (Hyla regilla, Taricha torosa, Bufo boreas, and Rana catesbeiana) from two California ponds. The frequency of abnormalities differed significantly by species, life-history stage, pond, andseason. Generally, the frequency and severity of abnormalities were greater in the amphibians from Frog Pond over those from Hidden Pond, and in lan,al stages over emerging and adult amphibians. Larvae of T. torosa exhibitedthe highest rate of abnormalities, ranging from 15-50%, followed by larvaland metamorphic H. regilla (10-25%), and finally by metamorphic B. boreas and R. catesbeiana, both of which had rates of less than five percent. Within each species, the composition of abnormalities was strongly consistent between years, ponds, and early life-history stages. We recorded the most severe malformations in H. regilla, and more than 60% of the abnormalities intreefrogs involved extra hindlimbs, femoral projections, and skin webbings. Similarly severe, the abnormalities of R. catesbeiana wore dominated by extra and missing hind- and forelimbs. In B. boreas and T torosa, the most common morphological abnormalities were missing limbs and digits, which accounted for approximately 75% and 95%, respectively., of their total abnormalities. Potential causes of the observed abnormalities, including infection by the trematode Ribeiroia, and the conservation significance of amphibian malformations are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 22:47:39