5 documents found, page 1 of 1
Trophic position of dolphins tracks recent changes in the pelagic ecosystem of ...
Bode, Antonio; Saavedra, Camilo; Álvarez-González, Miguel; Arregui, Marina; Arbelo, Manuel; Fernández, Antonio; Freitas, Luís; Silva, Mónica A.Dolphins play a key role in marine food webs as predators of mid-trophic-level consumers. Because of their mobility and relatively long life span, they can be used as indicators of large-scale changes in the ecosystem. In this study, we calculated the trophic position (TP) of 5 dolphin species from the Canary, Madeira and Azores Islands using bulk and compound-specific stable isotope ratios from muscle tissue t...
Stranding patterns and feeding ecology of striped dolphins, Stenella coeruleoal...
Marçalo, Ana; Giménez, Joan; Nicolau, Lídia; Frois, Jessica; Ferreira, Marisa; Sequeira, Marina; Eira, Catarina; Pierce, Graham J.; Vingada, JoséThe striped dolphin, Stenella coeruleoalba, is one of the most abundant cetacean species off the Western Iberian coast, however, studies on the species regarding biology, ecology, threats or conservation efforts are lacking. This study investigates stranding patterns (years 1981–2014) and diet (2002–2014) of striped dolphins (Stenella coeruleoalba) off the Portuguese mainland coast. Stranded animals were sample...
Energy content of anchovy and sardine using surrogate calorimetry methods
Campanini, Claudia; Albo Puigserver, Marta; Gérez, Sara; Lloret-Lloret, Elena; Giménez, Joan; Pennino, Maria Grazia; Bellido, José MaríaEuropean anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) are crucial species for the marine ecosystem of the Northwestern Mediterranean Sea. They account for a high percentage of fish landings and they represent an important economic income for the fishery sector. Concerns over their stock status are rising in recent years as biomass, growth, reproductive capacity, and body condition of both s...
Consumption rates and interaction with fisheries of Mediterranean common dolphi...
Giménez, Joan; Authier, Matthieu; Valeiras, Julio; Abad, Esther; Marçalo, Ana; Coll, Marta; Gauffier, Pauline; Santos, M. Begoña; de Stephanis, RenaudCommon dolphins (Delphinus delphis) are top predators, feeding on a wide variety of prey species, several of which are also targeted by fisheries. The last remaining healthy group of the endangered Mediterranean common dolphin subpopulation is located in the Alboran Sea. Their feeding grounds overlap with the fishing grounds of trawlers targeting European hake (Merluccius merluccius) and blue whiting (Micromess...
Diet of bottlenose dolphins (Tursiops truncatus) from the Gulf of Cadiz: Insigh...
Giménez, Joan; Marçalo, Ana; Ramírez, Francisco; Verborgh, Philippe; Gauffier, Pauline; Esteban, Ruth; Nicolau, Lídia; González-Ortegón, EnriqueThe ecological role of species can vary among populations depending on local and regional differences in diet. This is particularly true for top predators such as the bottlenose dolphin (Tursiops truncatus), which exhibits a highly varied diet throughout its distribution range. Local dietary assessments are therefore critical to fully understand the role of this species within marine ecosystems, as well as its ...