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Genre/Form: | Thèses et écrits académiques |
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Additional Physical Format: | Analyse des signaux acoustiques d'origine biologique enregistrés dans l'océan Indien : implications dans le recensement et le suivi des mouvements saisonniers des cétacés / Flore Samaran Villeurbanne : [CCSD], 2009 (ABES)226323846 Analyse des signaux acoustiques d'origine biologique enregistrés dans l'océan Indien : implications dans le recensement et le suivi des mouvements saisonniers des cétacés / Flore Samaran Lille : Atelier national de reproduction des thèses, 2008 Microfiches. (@Lille-thèses) (ABES)24709319X |
Material Type: | Thesis/dissertation |
Document Type: | Book |
All Authors / Contributors: |
Flore Samaran; Christophe Guinet; Université de La Rochelle. |
OCLC Number: | 494945149 |
Description: | 1 vol. (223 p.) : ill. en coul. ; 30 cm. |
Responsibility: | Flore Samaran ; sous la direction de Christophe Guinet. |
Abstract:
The main goal of this PhD was to improve knowledge about the current occurrence and seasonal distribution pattern of baleen whales in the southwestern Indian Ocean. The intensive whaling during the 20th century reduced dramatically baleen whale population to near extinction. The lack of information about the current occurrence and distribution of baleen whale underscore the difficulty to study these species with traditional visual survey in the Southern Ocean. Here, one year of acoustic observations in sub Antarctic area (near Crozet archipelago) was examined to assess baleen whale presence by using species specific calls in a detection distance range of approximately 250km (estimate from parabolic equation propagation loss models). Fin whale calls, Antarctic blue whale calls and pygmy blue whale (Madagascar type and Australia type) calls were detected. The variation of call number over one year revealed different patterns of whale occurrence. Detection of fin whale calls were very scarce and occur only during winter and fall time. Antarctic blue whale calls were detected year round, but the decrease of calls number during summer time suggests, on the one hand, one part of Antarctic blue whale population leave the area during winter, probably to migrate and spend feeding period in higher latitude, and on the other hand another part of the population seems to stay in the sub Antarctic area. In the same time, and only during this specific feeding season, pygmy blue whale calls were detected in this area. Occurrence of these two blue whale sub-species during summer period suggests that this specific area could be a high biological productivity region which represents a baleen whale feeding ground.
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- Rorqual bleu -- Indien, Océan.
- Rorqual bleu -- Austral, Océan.
- Animaux -- Variations saisonnières -- Indien, Océan.
- Animaux -- Variations saisonnières -- Austral, Océan.
- Animaux -- Distribution géographique -- Indien, Océan.
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- Bioacoustique.
- Animaux -- Migration.