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| Darnaude, Audrey M.; Hunter, Ewan. |
| The oxygen isotopic ratio of fish otoliths is increasingly used as a 'natural tag' to assess provenance in migratory species, with the assumption that variations in delta O-18 values closely reflect individual ambient experience of temperature and/or salinity. We employed archival tag data and otoliths collected from a shelf-scale study of the spatial dynamics of North Sea plaice Pleuronectes platessa L., to examine the limits of otolith delta O-18-based geolocation of fish during their annual migrations. Detailed intra-annual otolith delta O-18 measurements for 1997-1999 from individuals of 3 distinct sub-stocks with different spawning locations were compared with delta O-18 values predicted at the monthly, seasonal and annual scales, using predicted... |
| Tipo: Text |
Palavras-chave: Fish migration; Oxygen; Stable isotopes; Natural tag; Site fidelity; Plaice; Pleuronectes platessa. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00626/73782/75084.pdf |
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| Carpentier, Alice S.; Berthe, Cécile; Ender, Isabel; Jaine, Fabrice R. A.; Mourier, Johann; Stevens, Guy; De Rosemont, Moeava; Clua, Eric. |
| In French Polynesia, both currently recognized manta ray species, Mobula alfredi and M. birostris, are observed. Despite being an important cultural asset and generating significant economic benefits through manta ray watching tourism, published data on the ecology and threats to these species in the region are scarce. Based on an 18-year dataset of sighting records collected by citizen scientists and during two scientific expeditions, this study provides the first insights into the population characteristics and regional distribution of the two manta ray species in French Polynesia. A total of 1347 manta ray photographs (1337 for M. alfredi and 10 for M. birostris) were examined for the period January 2001–December 2017, with photo-identification... |
| Tipo: Text |
Palavras-chave: Site fidelity; Citizen science; Sympatry; Spatial connectivity; Ecotourism management. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00515/62642/69702.pdf |
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| Couturier, L. I. E.; Newman, P.; Jaine, F. R. A.; Bennett, M. B.; Venables, W. N.; Cagua, E. F.; Townsend, K. A.; Weeks, S. J.; Richardson, A. J.. |
| Understanding variations in habitat use through time contributes to identification of habitats critical for species survival. Here we used passive acoustic telemetry to examine the residency and site fidelity patterns of the reef manta ray Mobula alfredi at Lady Elliot Island (LEI), a key aggregation site in eastern Australia. Six acoustic receivers were moored around LEI between 2009 and 2012, and 34 acoustic transmitters were deployed on manta rays. All tagged animals returned to this site within their recording period, with some individuals visiting the area for up to 23 consecutive days. Using a set of mixed effect models, we analysed the hourly visitation patterns of manta rays in relation to temporal and environmental variables. Diel phase and sea... |
| Tipo: Text |
Palavras-chave: Acoustic telemetry; Site fidelity; Residency; Generalised linear mixed models; Elasmobranch; Conservation. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00449/56080/57611.pdf |
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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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| Simões-Lopes,Paulo C; Fabian,Marta E. |
| Residence patterns, habitat use, range, and some population estimate of the coastal bottlenose dolphin, Tursiops truncatus (Montagu, 1821), were documented in two coastal sites in southern Brazil: Laguna (Santa Catarina) (28º30'S; 48º55'W), and Imbe/Tramandai (Rio Grande do Sul) (29º58'S; 50º07'W). Regular observations were carried out at the Laguna system for 27 months (August 1989 to December 1991). The dolphins were photo-identified using natural permanent marks. Over 4,500 photograps were taken from shore grounds 6 to 14 meters away. Up to 51 dolphins have used the estuaries of Laguna's canal and Imarui-Santo Antonio's lagoon system in 1991. A stable group of nine animals has inhabited the Imbe/Tramandai area for over 13 years. Both sites were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tursiops truncatus; Bottlenose dolphin; Residence patterns; Site fidelity; Southern Brazil. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400012 |
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