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| Registros recuperados: 11 | |
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| Fruet,Pedro F; Secchi,Eduardo R; Di Tullio,Juliana C; Kinas,Paul G. |
| A new mark-recapture abundance estimate and a photographic census were carried out to investigate the possible decline in the abundance of the bottlenose dolphins, Tursiops truncatus (Montagu, 1821), in the Patos Lagoon estuary due to the high levels of bycatch mortality which occurred between 2002 and 2006 in oceanic coastal areas close to the estuary. Fourteen systematic boat surveys were conducted between August and early December 2005 to photo-identify the bottlenose dolphins. The estimated number of animals, with long-lasting marks, in the population obtained from Chapman's and Mth models were 51 (95% CI = 49-53) and 52 (95% CI = 51-60), respectively. Taking into account the proportion of dolphins with long-lasting marks in the population, the total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cetaceans; Mark-recapture; Photoidentification. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000100004 |
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| Camphuysen, C.J.; Smeenk, C.; Addink, M.; Jansen, O.E.. |
| Between 1998 and 2007, 2063 cetaceans were found stranded in the Netherlands, representing at least 14 species. Two species, humpback whale (Megaptera novaeangliae) and Blainville’s beaked whale (Mesoplodon densirostris), are additions to the Dutch list. Apart from the first humpback whales, relatively many balaenopterid whales were found in comparison with previous decades. Range extension of recovering populations may explain part of this trend. However, the decline in strandings frequency in sperm whales (Physeter macrocephalus), another species with a slowly recovering Atlantic population but with a distinct peak in strandings in the 1990s, suggests that the factors underlying these changes are complex. During the 20th century, the strandings frequency... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cetaceans; Strandings; The Netherlands; North Sea; Wadden Sea; Fin whale; Sei whale; Minke whale; Humpback; 42.84. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/328649 |
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| Oliveira,Elaine C. da S.; Tardin,Rodrigo H.; Poletto,Fabiana R.; Simão,Sheila M.. |
| The coordinated feeding tactics used by delphinids are influenced by differences in the distribution of prey species, season, and opportunities for social learning. In the present study, we compared the coordinated feeding behavior of two populations of the Guiana dolphin, Sotalia guianensis, in southeastern Brazil, and how these feeding tactics vary seasonality and in the presence of calves. We observed eight types of coordinated feeding tactics, which differed in frequency and in the mean number of individuals engaged in them, and between both areas. Feeding tactics used to herd and capture prey were the most frequent and engaged a greater number of individuals, suggesting that these tactics are better for capturing fish that gather in larger schools.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cetaceans; Coordinated hunt; Feeding tactics; Prey; Social behavior. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000600001 |
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| Lambert, C.; Authier, M.; Doray, Mathieu; Doremus, G.; Spitz, J.; Ridoux, V.. |
| Most oceanographic systems, especially shelf ecosystems, are characterised by interannual variability in the timing, extent and intensity of their seasonal patterns. Such interannual variations have important consequences on top predator habitat preferences. Capitalising on oceanographic surveys performed every spring since 2004 in the Bay of Biscay (BoB), this study explored interannual variations in habitat preferences exhibited by five mobile top predator species: bottlenose and common dolphins, auks, fulmars and northern gannets. We expected to find species with similar habitat preferences every year or species exhibiting important variability in their habitat preferences. First, we identified with a Principal Component Analysis (PCA) three different... |
| Tipo: Text |
Palavras-chave: Habitat preference; Temporal variability; Cetaceans; Seabirds; North Atlantic; Bay of Biscay. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00431/54226/55549.pdf |
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| Bouchet, Pj; Miller, Dl; Roberts, Jj; Mannocci, Laura; Harris, Cm; Thomas, L. |
| Forecasting the responses of biodiversity to global change has never been more important. However, many ecologists faced with limited sample sizes and shoestring budgets often resort to extrapolating predictive models beyond the range of their data to support management actions in data‐deficient contexts. This can lead to error‐prone inference that has the potential to misdirect conservation interventions and undermine decision‐making. Despite the perils associated with extrapolation, little guidance exists on the best way to identify it when it occurs, leaving users questioning how much credence they should place in model outputs. To address this, we present dsmextra, a new R package for measuring, summarising, and visualising extrapolation in... |
| Tipo: Text |
Palavras-chave: Cetaceans; Distance sampling; Ecological predictions; Extrapolation; Model transferability; R package; Spatial modelling; Wildlife surveys. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75485/76332.pdf |
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| Botero-Acosta,Natalia; Bohrer do Amaral,Karina; Barragán-Barrera,Dalia C.; Farías-Curtidor,Nohelia; Moreno-Sotomayor,Jorge H.; Macías-Campo,Heidys M.; Álzate-Montoya,Alejandro; Barrientos-Muñoz,Karla G.. |
| ABSTRACT Between January 23rd and 27th, 2020, a Fin whale (Balaenoptera physalus) was seen in coastal waters of the Rosario and San Bernardo Corals National Natural Park. This is the first known record of a live animal for the Colombian Caribbean Sea. While it was not possible to establish causality relationships, the present note includes a description of the environmental and oceanographic context associated with sightings. While the Colombian Caribbean, because of its oligotrophy, would not permanently sustain a constant presence of the great baleen whales, its inclusion as part of the potential distribution range for Fin whales is suggested. The current report also highlights the importance and relevance of citizen science, in addition to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Common rorqual; Cetaceans; Report; Citizen science; Colombia. |
| Ano: 2020 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000300259 |
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| Motta,Monica Regina Alves; Pinheiro,Diana Célia Sousa Nunes; Carvalho,Vitor Luz; Viana,Daniel de Araújo; Vicente,Ana Carolina Paulo; Iñiguez,Alena Mayo. |
| The gastric compartments of ten cetaceans stranded on the coast of Ceará State, Northeast Brazil were analyzed in this study. Gastric Anisakis spp. was diagnosed in all individuals involved in this study. Parasites and tissue samples were collected during necropsy. The presence of Anisakis parasites showed similar distribution across the three gastric compartments and the majority was free within the gastric lumen. Macroscopically, the lesions were predominantly characterized by the presence of ulcers (60%, 6/10) within the gastric mucosa, occasionally associated with edema and hemorrhage (30%, 3/10). Eight cetaceans (8/10 - 80%) presented gastric microscopic alterations and in 75% (6/8) of these animals, chronic lymphoplasmocytic gastritis was observed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anisakis sp; Nematodes; Ulcers; Pathology; Marine mammals; Cetaceans; Stranding. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200010 |
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| Santos,Marcos C. de O.; Oshima,Júlia E. de F.; Pacífico,Eduardo dos S.; Silva,Ednilson da. |
| The aim of the present study was to provide a preliminary description of habitat use by Guiana dolphins, Sotalia guianensis (Van Bénéden, 1864) in the Paranaguá Estuarine Complex (PEC), state of Paraná, Brazil. Approximately 124 km² were surveyed by small boat from April 2006 to July 2008 in the following subsets of the PEC: Canal do Superagui (~28 km²); Pinheiros Bay (~34 km²); part of Laranjeiras Bay, which included the Guaraqueçaba sub-estuary (~38 km²); and part of the Mixture Section of the PEC (~24 km²). Our efforts were unevenly distributed in the study area. During 55 survey days covering seven distinct seasons, we spent 165 hours observing 323 groups of S. guianensis. Group size varied from two individuals to aggregations as large as approximately... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Habitat use; Site fidelity; Cetaceans; Ecology. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000300002 |
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| Биркун, А. А.; Кривохижин , С. В.. |
| Исследовано содержимое желудков у 157 выброшенных на побережье и случайно пойманных в рыболовные сети черноморских китообразных, включая 123 азовок (Phocoena phocoena relicta), 26 белобочек (Delphinus delphis ponticus) и 8 афалин (Tursiops truncatus ponticus) из вод Украины, Болгарии, Грузии и России. Зарегистрированы новые объекты питания для азовки – пиленгас (Liza haematocheila) и спикара (Spicara flexuosa), а также один вид для белобочки и афалины – сарган (Belone belone euxini). Показано, что в современных условиях основными пищевыми объектами морских свиней в водах Украины являются шпрот (Sprattus sprattus phalaericus), мерланг (Merlangius merlangus euxinus) и хамса (Engraulis encrasicolus). Общий список рыб, входящих в рацион черноморских... |
| Tipo: Journal Contribution |
Palavras-chave: Китообразные; Азовка; Белобочка; Афалина; Питание; Чёрное море; Cetaceans; Harbour porpoise; Common dolphin; Bottlenose dolphin; Feeding ecology; Black Sea. |
| Ano: 2009 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/1196 |
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| Registros recuperados: 11 | |
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