Seasonal changes in size, sex-ratio and bodycondition of the damselfish Chromis chromisin the central Mediterranean Sea

Gianluca Sara', Susanna Piovano, Claudia Bracciali, Cristina Giacoma

Risultato della ricerca: Articlepeer review

6 Citazioni (Scopus)

Abstract

Chromis chromis is one of the most abundant fish species on the Mediterranean rocky shores. Acting as a by-pass of nutrients from the pelagic to the rocky littoral system, it plays an important role as a resource provider and has a relevant function inthe community assemblage. Chromis chromis has many of the characteristics required of an indicator species (e.g. it is easy to recognize in the field, small sized, widespread and abundant). In this study we focused on individual size, sex-ratio and body condition in a damselfish population occurring in a central Mediterranean marine protected area. Fishing trials on a monthlybasis (April–November) allowed us to assess seasonal changes in population structure. Fish were measured and weighed and a subsample was aged and sexed. On average, males were larger than females. The allometric coefficient, b, for the whole population was 2.99; the maximum age recorded was 7.5 yr. Before reproduction sex-ratio was close to parity (M:F 1:0.78), while a larger proportion of females was captured during the reproductive period. In conclusion, our results show that the population dynamics of C. chromis is influenced by both sex and size. Since males and females have different behavioural strategies, and since the length of the spawning period is shorter in the smaller than in the larger-sized individuals, thisis reflected in temporal changes observed in the population structure.
Lingua originaleEnglish
pagine (da-a)1053-1061
Numero di pagine9
RivistaJournal of the Marine Biological Association of the United Kingdom
Volume94
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

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