P. Dumas - Profile on Academia.edu (original) (raw)
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Università degli Studi di Milano - State University of Milan (Italy)
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Papers by P. Dumas
Behavioural Processes, 1998
Life and development in complete darkness for a strictly cavernicolous Urodele species such as Pr... more Life and development in complete darkness for a strictly cavernicolous Urodele species such as Proteus raises the problem of orientation and environmental perception. An experimental study of olfaction in Proteus anguinus was undertaken on two complementary aspects: (a) a anatomical and ultrastructural aspect (photon and electron microscopy); and (b) a behavioural aspect, by testing Proteus' sensitivity to decreasing amounts of dead prey (chironomid larvae) in a choice chamber. The results show that: (a) Proteus' olfactory epithelium clearly belonged to the general model established for all vertebrates, with a pseudo-stratified structure mainly composed of the three classical cell types (sensory cells, supporting cells and basal cells). With the unusual thickness of the epithelium common to the Proteidae, a fourth cell type is observed in Proteus; and (b) Proteus shows a well-developed olfactive sense: the sensitivity threshold occurs around 1 g of prey (in a 250 cm 3 /min water current). This relatively low detection threshold implies the use of an outstanding sense of smell probably due to the particular necessities of the subterranean environment. The experiments also emphasize the effects of environmental factors on Proteus' response to experiments, and the role of thigmotactism.
Fisheries Research, 2011
The gathering of invertebrates during low tides is a traditional activity across the Pacific isla... more The gathering of invertebrates during low tides is a traditional activity across the Pacific islands, but it still remains poorly documented. Recreational invertebrate harvesting was investigated in 2008 and 2009 in the coastal/islet reef flats surrounding Noumea, the main urbanized area in New Caledonia (South Pacific). Human frequentation, harvesting effort, captures and their impacts on the density and size structure
Environmental Conservation, 2010
8 Despite the current expansion of community-based 9 marine conservation initiatives in the Pacif... more 8 Despite the current expansion of community-based 9 marine conservation initiatives in the Pacific, few 10 studies have specifically addressed their ecological 11 efficiency to restore or enhance reef invertebrate 12 resources. This paper investigated the effects of two 13 very small (<0.05 km 2 ) recent village-based marine 14 reserves (tabu areas) located along the shallow fringing 15 reef of Emau island, Vanuatu. Surveys focused on 16 heavily harvested species (namely trochus, giant clams 17 and green snails) and involved both experienced 18 scientists and local villagers. Abundance, density and 19 individual size data were collected by snorkelling 20 along random transect belts located inside and outside 21 the tabu areas, using simple PVC measuring tools 22
Behavioural Processes, 1998
Life and development in complete darkness for a strictly cavernicolous Urodele species such as Pr... more Life and development in complete darkness for a strictly cavernicolous Urodele species such as Proteus raises the problem of orientation and environmental perception. An experimental study of olfaction in Proteus anguinus was undertaken on two complementary aspects: (a) a anatomical and ultrastructural aspect (photon and electron microscopy); and (b) a behavioural aspect, by testing Proteus' sensitivity to decreasing amounts of dead prey (chironomid larvae) in a choice chamber. The results show that: (a) Proteus' olfactory epithelium clearly belonged to the general model established for all vertebrates, with a pseudo-stratified structure mainly composed of the three classical cell types (sensory cells, supporting cells and basal cells). With the unusual thickness of the epithelium common to the Proteidae, a fourth cell type is observed in Proteus; and (b) Proteus shows a well-developed olfactive sense: the sensitivity threshold occurs around 1 g of prey (in a 250 cm 3 /min water current). This relatively low detection threshold implies the use of an outstanding sense of smell probably due to the particular necessities of the subterranean environment. The experiments also emphasize the effects of environmental factors on Proteus' response to experiments, and the role of thigmotactism.
Fisheries Research, 2011
The gathering of invertebrates during low tides is a traditional activity across the Pacific isla... more The gathering of invertebrates during low tides is a traditional activity across the Pacific islands, but it still remains poorly documented. Recreational invertebrate harvesting was investigated in 2008 and 2009 in the coastal/islet reef flats surrounding Noumea, the main urbanized area in New Caledonia (South Pacific). Human frequentation, harvesting effort, captures and their impacts on the density and size structure
Environmental Conservation, 2010
8 Despite the current expansion of community-based 9 marine conservation initiatives in the Pacif... more 8 Despite the current expansion of community-based 9 marine conservation initiatives in the Pacific, few 10 studies have specifically addressed their ecological 11 efficiency to restore or enhance reef invertebrate 12 resources. This paper investigated the effects of two 13 very small (<0.05 km 2 ) recent village-based marine 14 reserves (tabu areas) located along the shallow fringing 15 reef of Emau island, Vanuatu. Surveys focused on 16 heavily harvested species (namely trochus, giant clams 17 and green snails) and involved both experienced 18 scientists and local villagers. Abundance, density and 19 individual size data were collected by snorkelling 20 along random transect belts located inside and outside 21 the tabu areas, using simple PVC measuring tools 22