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Titolo:
EFFECTS OF DIFFERENT PREDATORS ON THE SURVIVAL AND DEVELOPMENT OF TADPOLES FROM THE HYBRIDOGENETIC RANA-ESCULENTA COMPLEX
Autore:
SEMLITSCH RD;
Indirizzi:
UNIV ZURICH,INST ZOOL,WINTERTHURERSTR 190 CH-8057 ZURICH SWITZERLAND
Titolo Testata:
Oikos
fascicolo: 1, volume: 67, anno: 1993,
pagine: 40 - 46
SICI:
0030-1299(1993)67:1<40:EODPOT>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYLA-CHRYSOSCELIS; COMPETITION; CHOICE; SIZE; METAMORPHOSIS; SYLVATICA; FROG; SITE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
R.D. Semlitsch, "EFFECTS OF DIFFERENT PREDATORS ON THE SURVIVAL AND DEVELOPMENT OF TADPOLES FROM THE HYBRIDOGENETIC RANA-ESCULENTA COMPLEX", Oikos, 67(1), 1993, pp. 40-46

Abstract

I studied the effects of predation on two genotypes of tadpoles from the hybridogenetic Rana lessonae-Rana esculenta complex. Tadpoles werereared at two larval densities in artificial ponds with fish, newts, dragonfly larvae, and in a control with no predators. Survival was significantly reduced by the presence of predators, but was not differentially affected by larval density. Only 0.33% of the tadpoles survived with fish, 48.9% with newts, and 70.8% with odonates. Survival was highest (93.4%) in control ponds. Survival in ponds with fish, newts, andcontrol ponds was not affected by genotype, however, in ponds with odonates the survival of R. esculents was higher than that of R. lessonae. The higher survival of R. esculenta appeared to be correlated with lower activity of tadpoles. The percentage of survivors that metamorphosed was significantly affected by larval density, but not by predators or genotype of tadpole. Of the surviving tadpoles, 90.6% reared at high larval density and 96.4% reared at the low density metamorphosed. Metamorphs emerged larger in ponds with more intense predation and at low larval density. Rana esculenta tadpoles emerged sooner than those of R. lessonae. Rana esculenta hybrid tadpoles outperformed the parental species R. lessonae in days to metamorphosis. Results from my experiment suggest that the hybrid R. esculenta is equally or more successful than the parental species R. lessonae when reared with some aquaticpredators. Differential activity of tadpoles is suggested as a possible mechanism accounting for the success of the hybrid.

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Documento generato il 21/09/20 alle ore 16:15:47