The ambient acoustic environment in Laguna San Ignacio, Baja California Sur, Mexico.
J Acoust Soc Am
; 138(5): 3397-410, 2015 Nov.
Article
em En
| MEDLINE
| ID: mdl-26627811
Each winter gray whales (Eschrichtius robustus) breed and calve in Laguna San Ignacio, Mexico, where a robust, yet regulated, whale-watching industry exists. Baseline acoustic environments in LSI's three zones were monitored between 2008 and 2013, in anticipation of a new road being paved that will potentially increase tourist activity to this relatively isolated location. These zones differ in levels of both gray whale usage and tourist activity. Ambient sound level distributions were computed in terms of percentiles of power spectral densities. While these distributions are consistent across years within each zone, inter-zone differences are substantial. The acoustic environment in the upper zone is dominated by snapping shrimp that display a crepuscular cycle. Snapping shrimp also affect the middle zone, but tourist boat transits contribute to noise distributions during daylight hours. The lower zone has three source contributors to its acoustic environment: snapping shrimp, boats, and croaker fish. As suggested from earlier studies, a 300 Hz noise minimum exists in both the middle and lower zones of the lagoon, but not in the upper zone.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Som
/
Baleias
Limite:
Animals
País/Região como assunto:
Mexico
Idioma:
En
Revista:
J Acoust Soc Am
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos
País de publicação:
Estados Unidos