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Titolo:
Variation in pesticide tolerance of tadpoles among and within species of ranidae and patterns of amphibian decline
Autore:
Bridges, CM; Semlitsch, RD;
Indirizzi:
Univ Missouri, Div Biol Sci, Columbia, MO 65211 USA Univ Missouri Columbia MO USA 65211 Div Biol Sci, Columbia, MO 65211 USA
Titolo Testata:
CONSERVATION BIOLOGY
fascicolo: 5, volume: 14, anno: 2000,
pagine: 1490 - 1499
SICI:
0888-8892(200010)14:5<1490:VIPTOT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
FROG RANA-CLAMITANS; INTRASPECIFIC VARIATION; POPULATION DECLINES; SIERRA-NEVADA; TOXICITY; CALIFORNIA; DESICCATION; DISAPPEARANCE; METAMORPHOSIS; SENSITIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Bridges, CM US Geol Survey, Columbia Environm Res Ctr, 4200 New Haven Rd, Columbia, MO65201 USA US Geol Survey 4200 New Haven Rd Columbia MO USA 65201 201 USA
Citazione:
C.M. Bridges e R.D. Semlitsch, "Variation in pesticide tolerance of tadpoles among and within species of ranidae and patterns of amphibian decline", CONSER BIOL, 14(5), 2000, pp. 1490-1499

Abstract

There a significant variation among and within amphibian species with respect to reports of population decline; declining species are often found in environments that are physiographically similar to environments where the same species is thriving. Because variability exists among organisms in their sensitivity to environmental stressors, it is important to determine the degree of this variation when undertaking conservation efforts. We conducted both lethal (time-to-death) and sublethal (activity change) assays to determine the degree of variation in the sensitivity of tadpoles to a pesticide, carbaryl, at three hierarchical levels: among ranid species, among several populations of a single ranid species (Rana sphenocephala), and within populations of R. sphenocephala We observed significant variation in time todeath among the nine ranid species and among the 10 R. sphenocephala populations we tested Four out of eight R. sphenocephala populations exhibited significantly different times to death among families. The magnitude of the activity change in response to exposure to sublethal carbaryl levels was significantly different among species and within R. sphenocephala populations. Chemical contamination, at lethal or sublethal levels, can alter natural regulatory processes such as juvenile recruitment in amphibian populations and should be considered a contributing cause of declines in amphibian populations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 11:04:12