Affiner votre recherche
Résultats 1-2 de 2
Toothed whales in the northwestern Mediterranean: Insight into their feeding ecology using chemical tracers
2011
Praca, Emilie | Laran, Sophie | Lepoint, Gilles | Thomé, Jean-Pierre | Quetglas, Antoni | Belcari, Paola | Sartor, Paolo | Dhermain, Frank | Ody, Denis | Tapie, Nathalie | Budzinski, Hélène | Dāsa, Kr̥shṇā
Risso’s dolphins, pilot whales and sperm whales rarely strand in the northwestern Mediterranean. Thus, their feeding ecology, through the analysis of stomach contents, is poorly known. The aim of this study was to gain further insight into the segregation/superposition of the diet and habitat of Risso’s dolphins, pilot whales and sperm whales using chemical tracers, namely, stable isotopes (δ¹³C, δ¹⁵N) and organochlorines. Significantly different δ¹⁵N values were obtained in Risso’s dolphins (11.7±0.7‰), sperm whales (10.8±0.3‰) and pilot whales (9.8±0.3‰), revealing different trophic levels. These differences are presumably due to various proportions of Histioteuthidae cephalopods in each toothed whale’s diet. Similar δ¹³C contents between species indicated long-term habitat superposition or corroborated important seasonal migrations. Lower congener 180 concentrations (8.20 vs. 21.73μg.g⁻¹ lw) and higher tDDT/tPCB ratios (0.93 vs. 0.42) were observed in sperm whales compared with Risso’s dolphins and may indicate wider migrations for the former. Therefore, competition between these species seems to depend on different trophic levels and migration patterns.
Afficher plus [+] Moins [-]Length-weight relationship of the most common cephalopod species in Montenegrin trawl | Dužinsko-težinski odnos najzastupljenijih vrsta cephalopoda u kočarskom ribolovu na Crnogorskom primorju
2011
Ikica, Z., Institut za biologiju mora, Kotor (Montenegro) | Kasalica, O., Institut za biologiju mora, Kotor (Montenegro) | Mandić, M., Institut za biologiju mora, Kotor (Montenegro) | Đurović, M., Institut za biologiju mora, Kotor (Montenegro)
A length-weight relationship (LW) for five cephalopod species, of which three decapod (Illex coindetii, Loligo vulgaris, Sepia officianlis) and two octopod species (Eledone cirrhosa, Eledone moschata) is given in this paper. The mean exponent b was found to be significantly lower than 3.
Afficher plus [+] Moins [-]