Ontogenetic differences in the circadian locomotor activity rhythm of the talitrid amphipod crustacean Orchestoidea tuberculata

Kennedy, F; Naylor, E; Jaramillo, E.

Abstract

Adult talitrid amphipods often display a nocturnal activity pattern, which has been shown in a number of cases to be partly controlled by an endogenous rhythm of circadian period. Juvenile talitrids have been little studied ill the past, but evidence from field studies indicates that they may display a different diel pattern of locomotor activity from that of adults. This study presents evidence from the field in south-central Chile that juvenile Orchestoidea tuberculata Nicolet show crepuscular activity peaks, contrasting with the nocturnal peaks shown by adult conspecifics. Under constant conditions in the laboratory, both juveniles and adults exhibit endogenous rhythms of circadian periodicity. However, the phasing of activity differs in juveniles and adults, corresponding to the differences observed in the field. It is suggested that differing phasing of peak locomotor activity may be a mechanism to reduce contact between juvenile rind adult talitrids, Experimental evidence indicates a significant negative influence on survival of juveniles in the presence of adult conspecifics by intraspecific predation. Other factors influencing the timing of surface activity are also discussed.

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Título según WOS: Ontogenetic differences in the circadian locomotor activity rhythm of the talitrid amphipod crustacean Orchestoidea tuberculata
Título según SCOPUS: Ontogenetic differences in the circadian locomotor activity rhythm of the talitrid amphipod crustacean Orchestoidea tuberculata
Título de la Revista: MARINE BIOLOGY
Volumen: 137
Número: 3
Editorial: Springer Verlag
Fecha de publicación: 2000
Página de inicio: 511
Página final: 517
Idioma: English
URL: http://link.springer.com/10.1007/s002270000358
DOI:

10.1007/s002270000358

Notas: ISI, SCOPUS