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• W2052979244 abstract "Sweetings Pond, a saltwater lake on Eleuthera Island, Bahamas, supported a high-density population of Octopus briareus Robson. Females spawned throughout the year in 1982–1983, but spawning peaked in February–March. A number of females spawned early and unsuccessfully in August, 1982. This event was followed in October by a reduction in adult density, and it may have caused late recruitment the following summer. Under natural conditions in Sweetings Pond, O. briareus occupied cavities underneath a variety of benthic formations. In field choice experiments with artificial dens, adult O. briareus displayed minimum cavity length and diameter requirements. Restricted entrances were not preferred, perhaps due to the availability of material with which O. briareus could block their den entrances. A tactile examination of the cavity was important in selection, but visual discrimination was also involved; translucent dens were completely avoided in favor of opaque ones. Certain sponge species were rarely occupied by O. briareus because they lacked sufficient cavity space underneath. When artificial dens were placed underneath these sponges they were occupied. Den defense was examined with a nearest neighbor experiment in which three pairs of artificial dens were placed in a study area. Dens were set 0, 15 and 50 cm apart and the frequency with which both dens of a pair were simultaneously occupied was recorded. The contiguous dens were never simultaneously occupied, whereas the other two pairs were simultaneously occupied with approximately equal frequency. Direct observations of intraspecific interactions confirmed the small size of the defended area. Abundant predatory fishes probably limit Octopus populations off the Eleuthera coast, and the absence of such fishes from Sweetings Pond may account for the high O. briareus density there. Though not subject to interspecific predation, lake O. briareus required the protection of dens due to cannibalism. Only a small minority of benthic formations in the lake were consistently occupied in 1982–1983, and enriching areas with artificial dens increased local density. This suggests that dens were limiting in Sweetings Pond. With suitable cavities so widely spaced, den defense probably did not influence density apart from limiting occupation to one octopus per cavity. No Octopus occupied artificial dens in a coastal enrichment experiment, implying that dens were not limiting off the coast." @default.
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• W2052979244 date "1986-01-01" @default.
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• W2052979244 title "Life history and den ecology of Octopus briareus Robson in a marine lake" @default.
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• W2052979244 doi "https://doi.org/10.1016/0022-0981(86)90086-9" @default.
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