|Publication Type:||Journal Article|
|Year of Publication:||2009|
|Authors:||T. S. Leite, Haimovici, M., Mather, J., Oliveira, J. E. L.|
|Type of Article:||Article|
|Keywords:||abundance, ATLANTIC, behavior, Cephalopoda, DEN ECOLOGY, distribution, dofleini, dynamics, Fishery management, habitat, life-history, Marine protected area, Octopus, populations, SOFT-SEDIMENT, VULGARIS MOLLUSCA|
The spatial distribution. abundance and habitat of a population of a shallow-water octopus, Octopus insularis, subject to some fishery pressure, was studied in the Fernando de Noronha Archipelago, a marine protected area off northeastern Brazil. Three techniques were used: visual censuses in fixed quadrants and in roving-diver and catch per unit of effort (CPUE) of the commercial fishery. We had two hypotheses, that the species had a nonrandom distribution, related to substrate and body size, and that relative abundance outside the national park would be lower than within, possibly due to fishery pressure. We found a patchy distribution overall, with octopuses almost confined to substrates with a large proportion of hard surfaces. There were seasonal and depth effects on distribution of the very small octopuses found mainly in shallow water (intertidal to 5 m depth) during the dry season. Abundance was similar inside and outside of the national park, which suggests that the octopus fishery is not a threat to the abundance of O. insularis at this present level. (C) 2009 Elsevier B.V. All rights reserved.
|Alternate Journal:||Fish Res.|