The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012
This study aimed to identify the occurrence and spatial distribution of cetaceans in Mauritanian waters (eastern Atlantic). A geophysical survey was conducted over 92 days between September and December 2012. Over 967 km was surveyed, with 1 017 h of observer effort recorded. Visual watches for mari...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
NISC
2019
|
Subjects: | |
Online Access: | https://www.ajol.info/index.php/ajms/article/view/181508 |
id |
ftjafricanj:oai:ojs.ajol.info:article/181508 |
---|---|
record_format |
openpolar |
spelling |
ftjafricanj:oai:ojs.ajol.info:article/181508 2023-05-15T15:36:15+02:00 The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 Russell, G. Sánchez-Cabanes, A. Nimak-Wood, M. 2019-01-07 application/pdf https://www.ajol.info/index.php/ajms/article/view/181508 eng eng NISC https://www.ajol.info/index.php/ajms/article/view/181508/170899 https://www.ajol.info/index.php/ajms/article/view/181508 Copyright for articles published in this journal is retained by the publisher. African Journal of Marine Science; Vol 40, No 4 (2018); 371–381 1814-2338 1814-232X generalised additive model generalised linear model marine mammals mysticetes odontocetes seismic data short-finned pilot whale West Africa info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2019 ftjafricanj 2019-01-13T01:04:14Z This study aimed to identify the occurrence and spatial distribution of cetaceans in Mauritanian waters (eastern Atlantic). A geophysical survey was conducted over 92 days between September and December 2012. Over 967 km was surveyed, with 1 017 h of observer effort recorded. Visual watches for marine mammals resulted in 228 cetacean sightings of 16 different species, including 12 odontocetes and 4 mysticetes. The short-finned pilot whale Globicephala macrorhynchus was the most frequently encountered odontocete, followed by the Atlantic spotted dolphin Stenella frontalis. Of the mysticetes, the sei whale Balaenoptera borealis and blue whale B. musculus were encountered most frequently. We used generalised additive models and generalised linear models to examine the relationships between environmental factors and cetacean distribution. The results showed depth had a significant influence on presence of the short-finned pilot whale, which preferred waters deeper than 1 800 m. The model for mysticetes identified bathymetry as a significant environmental predictor, whereas slope of the ocean floor had a positive effect but was not significant. This study contributes to our understanding of cetaceans in Mauritanian waters, using data from a platform of opportunity.Keywords: generalised additive model, generalised linear model, marine mammals, mysticetes, odontocetes, seismic data, short-finned pilotwhale, West Africa Article in Journal/Newspaper Balaenoptera borealis Blue whale Sei Whale AJOL - African Journals Online |
institution |
Open Polar |
collection |
AJOL - African Journals Online |
op_collection_id |
ftjafricanj |
language |
English |
topic |
generalised additive model generalised linear model marine mammals mysticetes odontocetes seismic data short-finned pilot whale West Africa |
spellingShingle |
generalised additive model generalised linear model marine mammals mysticetes odontocetes seismic data short-finned pilot whale West Africa Russell, G. Sánchez-Cabanes, A. Nimak-Wood, M. The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 |
topic_facet |
generalised additive model generalised linear model marine mammals mysticetes odontocetes seismic data short-finned pilot whale West Africa |
description |
This study aimed to identify the occurrence and spatial distribution of cetaceans in Mauritanian waters (eastern Atlantic). A geophysical survey was conducted over 92 days between September and December 2012. Over 967 km was surveyed, with 1 017 h of observer effort recorded. Visual watches for marine mammals resulted in 228 cetacean sightings of 16 different species, including 12 odontocetes and 4 mysticetes. The short-finned pilot whale Globicephala macrorhynchus was the most frequently encountered odontocete, followed by the Atlantic spotted dolphin Stenella frontalis. Of the mysticetes, the sei whale Balaenoptera borealis and blue whale B. musculus were encountered most frequently. We used generalised additive models and generalised linear models to examine the relationships between environmental factors and cetacean distribution. The results showed depth had a significant influence on presence of the short-finned pilot whale, which preferred waters deeper than 1 800 m. The model for mysticetes identified bathymetry as a significant environmental predictor, whereas slope of the ocean floor had a positive effect but was not significant. This study contributes to our understanding of cetaceans in Mauritanian waters, using data from a platform of opportunity.Keywords: generalised additive model, generalised linear model, marine mammals, mysticetes, odontocetes, seismic data, short-finned pilotwhale, West Africa |
format |
Article in Journal/Newspaper |
author |
Russell, G. Sánchez-Cabanes, A. Nimak-Wood, M. |
author_facet |
Russell, G. Sánchez-Cabanes, A. Nimak-Wood, M. |
author_sort |
Russell, G. |
title |
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 |
title_short |
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 |
title_full |
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 |
title_fullStr |
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 |
title_full_unstemmed |
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012 |
title_sort |
autumn occurrence and spatial distribution of cetaceans in the waters of mauritania during a geophysical survey in 2012 |
publisher |
NISC |
publishDate |
2019 |
url |
https://www.ajol.info/index.php/ajms/article/view/181508 |
genre |
Balaenoptera borealis Blue whale Sei Whale |
genre_facet |
Balaenoptera borealis Blue whale Sei Whale |
op_source |
African Journal of Marine Science; Vol 40, No 4 (2018); 371–381 1814-2338 1814-232X |
op_relation |
https://www.ajol.info/index.php/ajms/article/view/181508/170899 https://www.ajol.info/index.php/ajms/article/view/181508 |
op_rights |
Copyright for articles published in this journal is retained by the publisher. |
_version_ |
1766366599906852864 |