Competition for space: Recolonising seals displace endangered, endemic seabirds off namibia

Crawford, Robert J. M.; David, J. H. M.; Williams, Anthony; Dyer, Bruce M.

doi:10.1016/0006-3207(89)90059-1

Cited by 31 publications

(26 citation statements)

References 11 publications

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“…Other methods employed to protect seabirds are through the prevention or control of seals invading the seabird breeding areas. This has been accomplished successfully at Mercury Island, off the coast of Namibia, through the deliberate and systematic disturbance of the seals, until they eventually vacated the island and moved to the nearby mainland (Crawford et al 1989(Crawford et al , 1994. A similar process of disturbance is currently being pursued at other seabird colonies.…”

Section: Cochrane Et Al: Eaf In the Southern Benguela 2004mentioning

confidence: 99%

An ecosystem approach to fisheries in the southern Benguela context

Cochrane¹,

Augustyn²,

Cockcroft³

et al. 2004

African Journal of Marine Science

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Section: Cochrane Et Al: Eaf In the Southern Benguela 2004mentioning

confidence: 99%

An ecosystem approach to fisheries in the southern Benguela context

Cochrane¹,

Augustyn²,

Cockcroft³

et al. 2004

African Journal of Marine Science

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“…It is possible that the population at Pomona Island was also maintained for some time by immigration of birds from other localities. 1980s (Crawford et al 1989), but when fur seals were evicted, the penguin population at the island recovered (Crawford et al 1994).…”

Section: Influence Of Foodmentioning

confidence: 99%

“…The population at Seal Island in False Bay is small. Breeding space is limited by the fur seal population that occupies most of the island (Crawford et al 1989(Crawford et al , 1994.…”

Section: Crawford Et Al: African Penguins As Predator and Preymentioning

confidence: 99%

See 1 more Smart Citation

African penguins as predators and prey – coping (or not) with change

Crawford¹,

David²,

Shannon³

et al. 2001

South African Journal of Marine Science

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“…The main reason for the overall population decline is thought to be food shortage (Crawford et al 1999(Crawford et al , 2008a, but other factors, e.g. predation and displacement by seals, also play an important role (Crawford et al 1989, du Toit et al 2004.…”

Section: Introductionmentioning

confidence: 99%

Foraging behaviour of bank cormorants in Namibia: implications for conservation

Ludynia

Jones²,

Kemper³

et al. 2010

Endang. Species. Res.

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We studied the foraging and diving behaviour of male bank cormorants Phalacrocorax neglectus at Mercury Island, Namibia, during the 2007-2008 breeding season. The island hosts the world's largest breeding colony of this endangered species. Population numbers are currently stable at Mercury Island, whereas numbers at other colonies in Namibia are decreasing, including those at formerly important colonies. This trend is presumably due to reduced food availability. At Mercury Island, bank cormorants foraged inshore (ca. 2 km off the coast) in close vicinity to their breeding site (ca. 3 km off the colony) and dived to an average depth of 30 m. Diet at Mercury Island was dominated by demersally occurring pelagic goby Sufflogobius bibarbatus. Our findings suggest that bank cormorants are benthic feeders along their entire range and that their foraging behaviour in Namibia does not differ from that suspected in South Africa. Further studies, extending to other breeding sites, are needed to explain the different population trends and how these may be influenced by food availability. The identification of important foraging sites will play a crucial role in the management of Namibia's first Marine Protected Area and will contribute towards the protection of this species.

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Competition for space: Recolonising seals displace endangered, endemic seabirds off namibia

Cited by 31 publications

References 11 publications

An ecosystem approach to fisheries in the southern Benguela context

An ecosystem approach to fisheries in the southern Benguela context

African penguins as predators and prey – coping (or not) with change

Foraging behaviour of bank cormorants in Namibia: implications for conservation

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