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Titolo:
EFFECTS OF PREDATION RISK AND HUNGER ON THE BEHAVIOR OF 2 SPECIES OF TADPOLES
Autore:
HORAT P; SEMLITSCH RD;
Indirizzi:
UNIV ZURICH,INST ZOOL CH-8057 ZURICH SWITZERLAND
Titolo Testata:
Behavioral ecology and sociobiology
fascicolo: 6, volume: 34, anno: 1994,
pagine: 393 - 401
SICI:
0340-5443(1994)34:6<393:EOPRAH>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRADE-OFF; CONFLICTING DEMANDS; PREY INTERACTIONS; ANTIPREDATOR; FISH; RESPONSES; ODONATA; LARVAE; CUES;
Keywords:
AMPHIBIAN; FEEDING; PREDATION RISK; PREDATOR AVOIDANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
P. Horat e R.D. Semlitsch, "EFFECTS OF PREDATION RISK AND HUNGER ON THE BEHAVIOR OF 2 SPECIES OF TADPOLES", Behavioral ecology and sociobiology, 34(6), 1994, pp. 393-401

Abstract

Predation and hunger are threats for most organisms, and appropriate behavioural responses to both factors should be shaped by natural selection. In combination, however, the behavioural demands of predation avoidance and effective foraging often cannot be satisfied at the same time and lead to a conflict within organisms. We examined the behavioural responses of two closely-related species of tadpoles, Rana lessonae and R. esculenta, to simulated predation by fish and hunger. Tadpoles, hatched and reared in the laboratory, were tested in a three-way factorial (predation risk x hunger x species) experiment with four predation levels and four hunger levels. Both species decreased their swimming activity with increasing predation risk. Predation risk did not influence the amount of activity time invested in feeding but caused thetadpoles to spend less time in patches with food. Refuges were not used to avoid predation. R. esculenta was more sensitive to predation risk than R. lessonae. Hunger increased both the activity of tadpoles and the amount of activity time invested in feeding, thus indicating an increased energy intake. No interactions were observed between predation risk and hunger. These results show that tadpoles possess genetically-based behavioural mechanisms that allow them to respond in a gradedmanner to predation and hunger. However, they did not balance the twoconflicting demands of predation avoidance and effective foraging; the two mechanisms appeared to act independently.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 12:33:28