Skip to content

Research at St Andrews

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

Research output: Contribution to journalArticle

Standard

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

T2 - African Journal of Marine Science

JF - African Journal of Marine Science

SN - 1814-232X

IS - 3

ER -

Related by author

  1. Decline in abundance and apparent survival rates of fin whales (Balaenoptera physalus) in the northern Gulf of St. Lawrence

    Schleimer, A., Ramp, C., Delarue, J., Carpentier, A., Bérubé, M., Palsbøl, P. J., Sears, R. & Hammond, P. S., Apr 2019, In : Ecology and Evolution. 9, 7, p. 4231-4244 14 p.

    Research output: Contribution to journalArticle

  2. Variations in age- and sex-specific survival rates help explain population trend in a discrete marine mammal population

    Arso Civil, M., Cheney, B., Quick, N. J., Islas-Villanueva, V., Graves, J. A., Janik, V. M., Thompson, P. M. & Hammond, P. S., Jan 2019, In : Ecology and Evolution. 9, 1, p. 533-544 12 p.

    Research output: Contribution to journalArticle

  3. Phylogenetic relationships in southern African Bryde's whales inferred from mitochondrial DNA: further support for subspecies delineation between the two allopatric populations

    Penry, G. S., Hammond, P. S., Cockcroft, V. G., Best, P. B., Thornton, M. & Graves, J. A., Dec 2018, In : Conservation Genetics. 19, 6, p. 1349-1365

    Research output: Contribution to journalArticle

  4. Where eagles soar: fine-resolution tracking reveals the spatiotemporal use of differential soaring modes in a large raptor

    Murgatroyd, M., Photopoulou, T., Underhill, L., Bouten, W. & Amar, A., 11 Jun 2018, In : Ecology and Evolution. Early View, 12 p.

    Research output: Contribution to journalArticle

  5. Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa

    Kock, A. A., Photopoulou, T., Durbach, I., Mauff, K., Meÿer, M., Kotze, D., Griffiths, C. & O'Riain, M. J., 22 May 2018, In : Movement Ecology. 6, 13 p., 7.

    Research output: Contribution to journalArticle

Related by journal

  1. A visual and acoustic survey for harbour porpoises off North-West Africa: further evidence of a discrete population

    Boisseau, O., Matthews, J., Gillespie, D. M., Lacey, C., Moscrop, A. & El Ouamari, N., Dec 2007, In : African Journal of Marine Science. 29, 3, p. 403-410 8 p.

    Research output: Contribution to journalArticle

ID: 13975796