INVESTIGADORES
VOLPEDO Alejandra Vanina
artículos
Título:
Ecomorphological patterns of the sagitta in fish associated with bottom marine shelf in the Mar Argentino.
Autor/es:
VOLPEDO, A.V; ECHEVERR√ćA, D.D
Revista:
FISHERIES RESEARCH
Editorial:
Elsevier Science,
Referencias:
Lugar: Netherlands; Año: 2003 vol. 60 p. 551 - 560
ISSN:
0165-7836
Resumen:
Morphology and morphometry of the sagittae otolith were studied in fish associated with different substrates. The shape, margins and rostrum of three groups of otoliths from several species were analyzed: group 1 (fish associated with soft substrates, N= 10 species), group 2 (fish associated with hard substrates, N= 10 species) and group 3 (pelagic fish, not associated with the bottom, N= 6 species). E and R indexes were calculated for each species. The value of E = maximum width of the sagitta (WO)/maximum length of the sagitta (LO) %, expresses the relative tendency in the shape otolith (from circular to elongate). The value of R = length of the rostrum (LR)/LO%, expresses the percentage in the total length of the otolith that corresponds to the rostrum. The sagittae of group 1 were circular or polygonal with rounded borders. The rostrum can be absent or poorly developed. The sagittae shape of group 2 was elongated, with ornamented borders and a rostrum. The sagittae of group 3 possessed a prominent rostrum, a deep V-shaped cisure and ornamented borders. Statistical analysis showed no significant differences in the E index of groups 1 and 2, while R-values of the three groups were significantly different. These results were compared with 80 other species, belonging to 12 families, from the publisher literature. E and R-values could be used to characterize the sagittae of the marine fish and could be considered a useful tool for fish ecology studies.