Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Passive acoustic density estimation of sperm whales in the Tongue of the Ocean, Bahamas
Ward, J.A.; Thomas, L.; Jarvis, S.; DiMarzio, N.; Moretti, D.; Marques, T.A.; Dunn, C.; Claridge, D.; Hartvig, E.; Tyack, P. (2012). Passive acoustic density estimation of sperm whales in the Tongue of the Ocean, Bahamas. Mar. Mamm. Sci. 28(4): E444–E455. http://dx.doi.org/10.1111/j.1748-7692.2011.00560.x
In: Marine Mammal Science. Society for Marine Mammalogy: Lawrence. ISSN 0824-0469; e-ISSN 1748-7692
|  |
| Trefwoorden |
Physeter macrocephalus Linnaeus, 1758 [WoRMS]
Marien/Kust |
| Author keywords |
animal density;population size;sperm whale;Physeter macrocephalus;passive acoustic array |
| Auteurs | | Top |
- Ward, J.A.
- Thomas, L.
- Jarvis, S.
- DiMarzio, N.
|
- Moretti, D.
- Marques, T.A.
- Dunn, C.
|
- Claridge, D.
- Hartvig, E.
- Tyack, P.
|
| Abstract |
Long-term passive acoustic monitoring of marine mammals on navy ranges provides the opportunity to better understand the potential impact of sonar on populations. The navy range in Tongue of the Ocean (TOTO), Bahamas contains extensive hydrophone arrays, potentially allowing estimation of the density of deep diving, vocally active species such as the sperm whale (Physeter macrocephalus). Previous visual surveys in TOTO have been of limited spatio–temporal coverage and resulted in only sporadic sightings of sperm whales, whereas passive acoustic observations suggest the species is present year round. However, until now the means of acoustically determining the specific number of individuals in each cluster has been limited. We used recently developed algorithms to identify the number of echolocating whales present during a 42 d study period. We screened a 297 h acoustic data set to determine the proportion of time animals were present; fifty 10 min samples during presence were analyzed to estimate the number of individuals vocalizing during each sample. These counts were combined with an independent estimate of the proportion of 10 min periods when tagged animals vocalize. The estimated average density was 0.16 whales/1,000 km2 (CV 27%; 95% CI 0.095–0.264). The method is potentially applicable to other areas containing dense hydrophone arrays. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
