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Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa

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Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa. / Photopoulou, Theoni; Best, Peter B; Hammond, Philip Steven; Findlay, Ken.

In: African Journal of Marine Science, Vol. 33, No. 3, 11.01.2012, p. 393-401.

Research output: Contribution to journalArticle

Harvard

Photopoulou, T, Best, PB, Hammond, PS & Findlay, K 2012, 'Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa', African Journal of Marine Science, vol. 33, no. 3, pp. 393-401. https://doi.org/10.2989/1814232X.2011.637346

APA

Photopoulou, T., Best, P. B., Hammond, P. S., & Findlay, K. (2012). Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa. African Journal of Marine Science, 33(3), 393-401. https://doi.org/10.2989/1814232X.2011.637346

Vancouver

Photopoulou T, Best PB, Hammond PS, Findlay K. Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa. African Journal of Marine Science. 2012 Jan 11;33(3):393-401. https://doi.org/10.2989/1814232X.2011.637346

Author

Photopoulou, Theoni ; Best, Peter B ; Hammond, Philip Steven ; Findlay, Ken. / Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa. In: African Journal of Marine Science. 2012 ; Vol. 33, No. 3. pp. 393-401.

Bibtex - Download

@article{4b8adb18c0da4998bd47ad00db814b30,
title = "Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa",
abstract = "The presence and movement of Indo-Pacific bottlenose dolphins Tursiops aduncus were investigated using shore-based observations made during a humpback whale Megaptera novaeangliae migration survey at Cape Vidal, South Africa, undertaken between June and October 1988–1991. Occurrence was analysed as counts of dolphin sightings per hour within a generalised estimating equation framework. Bottlenose dolphin sightings decreased throughout the daily survey period, and there was a small seasonal peak in sightings during August. Data on movement trajectory were collected using a theodolite for 60{\%} of the groups of dolphins sighted. Most groups were observed travelling in a northerly direction, with few groups recorded moving south. A generalised linear model indicated that northward-travelling dolphins were located closer to shore, travelled at higher speeds, and occurred in bigger groups under low-tide conditions, than those seen moving in a southerly direction. The southward-flowing Agulhas Current is close to shore at Cape Vidal, where the continental shelf is particularly narrow. We suggest that bottlenose dolphins in this area have adopted a specific movement regime to cope with the consistent fast-flowing currents that dominate their environment at Cape Vidal.",
keywords = "Agulhas Current, Generlised estimating equation, Generalised linear model, Sightings, Theodolite, Tursiops aduncus",
author = "Theoni Photopoulou and Best, {Peter B} and Hammond, {Philip Steven} and Ken Findlay",
year = "2012",
month = "1",
day = "11",
doi = "10.2989/1814232X.2011.637346",
language = "English",
volume = "33",
pages = "393--401",
journal = "African Journal of Marine Science",
issn = "1814-232X",
publisher = "National Inquiry Services Centre Ltd",
number = "3",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Movement patterns of coastal dolphins in the presence of a fast-flowing prevailing current: shore-based observations at Cape Vidal, South Africa

AU - Photopoulou, Theoni

AU - Best, Peter B

AU - Hammond, Philip Steven

AU - Findlay, Ken

PY - 2012/1/11

Y1 - 2012/1/11

N2 - The presence and movement of Indo-Pacific bottlenose dolphins Tursiops aduncus were investigated using shore-based observations made during a humpback whale Megaptera novaeangliae migration survey at Cape Vidal, South Africa, undertaken between June and October 1988–1991. Occurrence was analysed as counts of dolphin sightings per hour within a generalised estimating equation framework. Bottlenose dolphin sightings decreased throughout the daily survey period, and there was a small seasonal peak in sightings during August. Data on movement trajectory were collected using a theodolite for 60% of the groups of dolphins sighted. Most groups were observed travelling in a northerly direction, with few groups recorded moving south. A generalised linear model indicated that northward-travelling dolphins were located closer to shore, travelled at higher speeds, and occurred in bigger groups under low-tide conditions, than those seen moving in a southerly direction. The southward-flowing Agulhas Current is close to shore at Cape Vidal, where the continental shelf is particularly narrow. We suggest that bottlenose dolphins in this area have adopted a specific movement regime to cope with the consistent fast-flowing currents that dominate their environment at Cape Vidal.

AB - The presence and movement of Indo-Pacific bottlenose dolphins Tursiops aduncus were investigated using shore-based observations made during a humpback whale Megaptera novaeangliae migration survey at Cape Vidal, South Africa, undertaken between June and October 1988–1991. Occurrence was analysed as counts of dolphin sightings per hour within a generalised estimating equation framework. Bottlenose dolphin sightings decreased throughout the daily survey period, and there was a small seasonal peak in sightings during August. Data on movement trajectory were collected using a theodolite for 60% of the groups of dolphins sighted. Most groups were observed travelling in a northerly direction, with few groups recorded moving south. A generalised linear model indicated that northward-travelling dolphins were located closer to shore, travelled at higher speeds, and occurred in bigger groups under low-tide conditions, than those seen moving in a southerly direction. The southward-flowing Agulhas Current is close to shore at Cape Vidal, where the continental shelf is particularly narrow. We suggest that bottlenose dolphins in this area have adopted a specific movement regime to cope with the consistent fast-flowing currents that dominate their environment at Cape Vidal.

KW - Agulhas Current

KW - Generlised estimating equation

KW - Generalised linear model

KW - Sightings

KW - Theodolite

KW - Tursiops aduncus

U2 - 10.2989/1814232X.2011.637346

DO - 10.2989/1814232X.2011.637346

M3 - Article

VL - 33

SP - 393

EP - 401

JO - African Journal of Marine Science

JF - African Journal of Marine Science

SN - 1814-232X

IS - 3

ER -

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