Age Determination and Lifespan of Marine Animal Species
Résumé
Ectotherms: species whose internal temperature is dependent on the ambient temperature. Endotherms: species whose internal temperature is fixed and regulated by the organism. Fish: paraphyletic group of fin and gill-bearing aquatic vertebrates. The term is used for convenience and refers usually to the teleosts taxa, but some authors may also include other taxa (e.g. elasmobranchs). Iteroparity: a reproductive strategy with several reproductive events during life, these events possibly occurring in successive years. Life-history strategies: strategies selected by natural selection during evolution allowing species to develop, live, and propagate (e.g. species with a short lifespan and many offspring, like mice, vs long-lived species with a few offspring, like elephants). Life-history traits: traits moulding life-history strategies (e.g. body size, age at maturity, duration of development, number of offspring, lifespan). Marine species: aquatic species living in seas and oceans, as opposed to freshwater species living in rivers, ponds, lakes and so on. Record lifespan: longest duration of life of individuals observed in a species. In most marine species, this age can reflect the age at capture and not the maximal lifespan, i.e. the lifespan of the last survivors.Abstract Determining the lifespan of marine animals is not easy because they live underwater, in the wild, and not in the laboratory. Various indirect methods have been used to overcome this issue. This article describes these methods and tries to explain why some non-mammalian marine species can live so long, when compared to mammals, terrestrial or not.
Domaines
Gériatrie et gérontologie
Origine : Fichiers produits par l'(les) auteur(s)
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