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Article: Daylight behaviour of humpback dolphins Sousa chinensis in Algoa Bay, South Africa

TitleDaylight behaviour of humpback dolphins Sousa chinensis in Algoa Bay, South Africa
Authors
KeywordsDaylight Behaviour Pattern
Seasonal Variation
Sousa Chinensis
Issue Date1999
Citation
Zeitschrift Fur Saugetierkunde, 1999, v. 64 n. 1, p. 19-29 How to Cite?
AbstractData on the daylight behaviour of humpback dolphins Sousa chinensis were collected during sea- and land-based surveys undertaken in Algoa Bay, Eastern Cape, South Africa, throughout a three year period. Dolphin activities/behaviour were categorised as: 'feeding', 'travelling', 'opportunistic feeding', 'socialising and playing', 'resting' and 'other'. It seems apparent that behaviour determines the spatial geometry of the dolphin group, but not the group size. The surfacing-breathing interval is similar for 'feeding', 'opportunistic feeding', and slow 'travelling', but differs considerably from the pattern displayed during fast 'travelling'. Daylight behaviour of humpback dolphins is dominated by 'feeding' and shows a regular pattern which is probably governed by the diurnal cycles of their prey. Generally, 'feeding' peaks in the morning and gradually decreases through the rest of the day. As 'feeding' decreases, 'travelling' and 'opportunistic feeding' increase, both peaking in the afternoon. 'Resting' and 'socialising and playing' occur with similar frequency throughout the day. This pattern varies little between summer and winter, as does the overall proportion of daylight behaviours. The only significant seasonal difference is in the frequency of 'social/sexual' behaviour which peaks in summer. Although tidal cycle influences to some extent the behaviour of humpback dolphins, in Algoa Bay their daylight activity/behaviour is predominantly governed by time of day.
Persistent Identifierhttp://hdl.handle.net/10722/178674
ISSN
2002 Impact Factor: 0.37

 

DC FieldValueLanguage
dc.contributor.authorKarczmarski, Len_US
dc.contributor.authorCockcroft, VGen_US
dc.date.accessioned2012-12-19T09:49:04Z-
dc.date.available2012-12-19T09:49:04Z-
dc.date.issued1999en_US
dc.identifier.citationZeitschrift Fur Saugetierkunde, 1999, v. 64 n. 1, p. 19-29en_US
dc.identifier.issn0044-3468en_US
dc.identifier.urihttp://hdl.handle.net/10722/178674-
dc.description.abstractData on the daylight behaviour of humpback dolphins Sousa chinensis were collected during sea- and land-based surveys undertaken in Algoa Bay, Eastern Cape, South Africa, throughout a three year period. Dolphin activities/behaviour were categorised as: 'feeding', 'travelling', 'opportunistic feeding', 'socialising and playing', 'resting' and 'other'. It seems apparent that behaviour determines the spatial geometry of the dolphin group, but not the group size. The surfacing-breathing interval is similar for 'feeding', 'opportunistic feeding', and slow 'travelling', but differs considerably from the pattern displayed during fast 'travelling'. Daylight behaviour of humpback dolphins is dominated by 'feeding' and shows a regular pattern which is probably governed by the diurnal cycles of their prey. Generally, 'feeding' peaks in the morning and gradually decreases through the rest of the day. As 'feeding' decreases, 'travelling' and 'opportunistic feeding' increase, both peaking in the afternoon. 'Resting' and 'socialising and playing' occur with similar frequency throughout the day. This pattern varies little between summer and winter, as does the overall proportion of daylight behaviours. The only significant seasonal difference is in the frequency of 'social/sexual' behaviour which peaks in summer. Although tidal cycle influences to some extent the behaviour of humpback dolphins, in Algoa Bay their daylight activity/behaviour is predominantly governed by time of day.en_US
dc.languageengen_US
dc.relation.ispartofZeitschrift fur Saugetierkundeen_US
dc.subjectDaylight Behaviour Patternen_US
dc.subjectSeasonal Variationen_US
dc.subjectSousa Chinensisen_US
dc.titleDaylight behaviour of humpback dolphins Sousa chinensis in Algoa Bay, South Africaen_US
dc.typeArticleen_US
dc.identifier.emailKarczmarski, L: leszek@hku.hken_US
dc.identifier.authorityKarczmarski, L=rp00713en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0033047390en_US
dc.identifier.volume64en_US
dc.identifier.issue1en_US
dc.identifier.spage19en_US
dc.identifier.epage29en_US
dc.identifier.scopusauthoridKarczmarski, L=6603422145en_US
dc.identifier.scopusauthoridCockcroft, VG=6701399767en_US

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