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| Santos,Urânia Amaral dos; Alvarez,Martin Roberto; Schilling,Ana Cristina; Strenzel,Gil Marcelo Reuss; Pendu,Yvonnick Le. |
| We analyzed the influence of time, tide and water depth on the activity and spatial distribution of estuarine dolphins Sotalia guianensis in Pontal Bay, Ilhéus, Brazil. Direct observations were carried out at four fixed points from January to December of 2006. Estuarine dolphins were sighted in 11 out of 12 months and in 30% of 181 sampling periods. The average group size, which was 3.75 ± 1.59 (n = 64), did not vary significantly by month (Kruskal-Wallis, H = 10.6729; p = 0.3836). Infants and adults represented 18 and 82% of the individuals whose age we were able to determine, respectively. Estuarine dolphins were more frequently present than expected in areas deeper than 3 m (regression GLM, z = 3.773; p = 0.0002). The animals were more frequently... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dolphin; Behavior; Time of the day; Tide; Water depth; Estuarine fauna. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000200007 |
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| Guyader, Olivier. |
| With a thin economic component, most bio-economic models of fisheries fail to assess the effects of the regulation systems on firms. In order to analyse the short term consequences of different management schemes, a simulation model is applied to the French driftnet albacore fleet: licence allocation with driftnet regulation, individual quotas, and individual transferable quotas without any input control. Vessel technology is estimated by using the data collected, and groups of vessels are distinguished according to criteria of performance. We present the adjustment within firms and between groups under different scenarios (limited entry with and without driftnet regulation, individual quotas and individual transferable quotas allocation), and we compare... |
| Tipo: Text |
Palavras-chave: Albacore tuna; Dolphin; Driftnet; Fisheries; ITQ; Licence; Quasi-rent; Quota price; Quotas; Regulation; Simulation. |
| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00244/35523/34036.pdf |
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