Food, fishing and seabirds in the Benguela upwelling system

Journal of Ornithology

Volumn 148, Issue SUPLL. 2, 2007, Pages

  Crawford, Robert J M ^a  

^a MARINE AND COASTAL MANAGEMENT   (South Africa)

Author keywords

Benguela; Food; Morus capensis; Phalacrocorax capensis; Spheniscus demersus

Indexed keywords

ABUNDANCE; BIOMASS; BREEDING; BREEDING POPULATION; FISH; FISHERY; FISHING; FOOD; POPULATION DECLINE; POPULATION DISTRIBUTION; PREY AVAILABILITY; SEABIRD; UPWELLING;

AFRICA; ANGOLA; BENGUELA; EASTERN CAPE; SOUTH AFRICA; SOUTHERN AFRICA; SUB-SAHARAN AFRICA; WESTERN CAPE;

ENGRAULIDAE; ENGRAULIS ENCRASICOLUS; MORUS (PLANT); MORUS CAPENSIS; PHALACROCORACIDAE; PHALACROCORAX CAPENSIS; SARDINOPS SAGAX; SPHENISCIDAE; SPHENISCUS DEMERSUS; SULIDAE;

EID: 36949010342     PISSN: 21937192     EISSN: 21937206     Source Type: Journal    
DOI: 10.1007/s10336-007-0228-z     Document Type: Review

References (45)

1. Armstrong MJ, Shelton PA, Prosch RM, Grant WS (1983) Stock assessment and population dynamics of anchovy and pilchard in ICSEAF Division 1.6 in 1982. Collect Sci Pap Int Comm Southeast Atl Fish 10(1):7-25
2. Berruti A, Underhill LG, Shelton PA, Moloney C, Crawford RJM (1993) Seasonal and interannual variation in the diet of two colonies of the Cape Gannet (Morus capensis) between 1977-78 and 1989. Colon Waterbirds 16:158-175
3. Boyer DC, Hampton I (2001) An overview of the living marine resources of Namibia. S Afr J Mar Sci 23:5-35
4. Cairns DK (1987) Seabirds as indicators of marine food supplies. Biol Oceanogr 5:261-271
5. Cooper J, Brooke RK, Shelton PA, Crawford RJM (1982) Distribution, population size and conservation of the Cape Cormorant Phalacrocorax capensis. Fish Bull S Afr 16:121-143
6. Crawford RJM (1991) Factors influencing population trends of some abundant vertebrates in sardine-rich coastal ecosystems. S Afr J Mar Sci 10:365-381
7. Crawford RJM (1998) Responses of African Penguins to regime changes of sardine and anchovy in the Benguela system. S Afr J Mar Sci 19:355-364
8. Crawford RJM (1999) Seabird responses to long-term changes of prey resources off Southern Africa. In: Adams NJ, Slotow RH (eds) Proceedings of the 22nd International Ornithological Congress, Durban, South Africa, August 1998. BirdLife South Africa, Johannesburg, South Africa, pp 688-705
9. Crawford RJM (2004) Accounting for food requirements of seabirds in fisheries management - the case of the South African purse-seine fishery. Afr J Mar Sci 26:197-203
10. Crawford RJM, Cruickshank RA, Shelton PA, Kruger I (1985) Partitioning of a goby resource amongst four avian predators and evidence for altered trophic flow in the pelagic community of an intense, perennial upwelling system. S Afr J Mar Sci 3:215-228
11. Crawford RJM, Shannon LV, Pollock DE (1987) The Benguela ecosystem. Part IV. The major fish and invertebrate resources. Oceanogr Mar Biol Ann Rev 25:353-505
12. Crawford RJM, Ryan PG, Williams AJ (1991) Seabird consumption and production in the Benguela and western Agulhas ecosystems. S Afr J Mar Sci 11:357-375
13. Crawford RJM, Allwright DM, Heyl CW (1992) High mortality of Cape Cormorants (Phalacrocorax capensis) off western South Africa in 1991 caused by Pasteurella multocida. Colon Waterbirds 15(2):236-238
14. Crawford RJM, Dyer BM (1995) Responses by four seabird species to a fluctuating availability of Cape anchovy Engraulis capensis off South Africa. Ibis 137:329-339
15. Crawford RJM, Williams AJ, Hofmeyr JH, Klages NTW, Randall RM, Cooper J, Dyer BM, Chesselet Y (1995) Trends of African Penguin Spheniscus demersus populations in the 20th century. S Afr J Mar Sci 16:101-118
16. Crawford RJM, Shannon LJ, Whittington PA (1999) Population dynamics of the African Penguin at Robben Island. Mar Ornithol 27:135-143
17. Crawford RJM, David JHM, Shannon LJ, Kemper J, Klages NTW, Roux J-P, Underhill LG, Ward VL, Williams AJ, Wolfaardt AC (2001) African Penguins as predators and prey - coping (or not) with change. S Afr J Mar Sci 23:435-447
18. Crawford RJM, Barham PJ, Underhill LG, Shannon LJ, Coetzee JC, Dyer BM, Leshoro TM, Upfold L (2006) The influence of food availability on breeding success of African Penguins Spheniscus demersus at Robben Island, South Africa. Biol Conserv 132(1):119-125
19. Crawford RJM, Dundee BL, Dyer BM, Klages NTW, Meÿer MA, Upfold L (2007) Trends in numbers of Cape Gannets (Morus capensis), 1956/ 1957-2005/2006, with a consideration of the influence of food and other factors. ICES J Mar Sci 64:169-177
20. Cury P, Bakun A, Crawford RJM, Jarre A, Quiñones RA, Shannon LJ, Verheye HM (2000) Small pelagics in upwelling systems: Patterns of interaction and structural changes in "wasp-waist" ecosystems. ICES J Mar Sci Symp Edn 57(3):603-618
21. Fairweather TP, van der Lingen CD, Booth AJ, Drapeau L, van der Westhuizen JJ (2006) Indicators of sustainable fishing for South African sardine (Sardinops sagax) and anchovy (Engraulis encrasicolus). Afr J Mar Sci 28:661-680
22. Grémillet D, Dell'Omo G, Ryan PG, Peters G, Ropert-Coudert Y, Weeks SJ (2004) Offshore diplomacy, or how seabirds mitigate intra-specific competition: A case study based on GPS tracking of Cape Gannets from neighbouring colonies. Mar Ecol Prog Ser 268:265-279
23. Hampton I (1987) Acoustic study on the abundance and distribution of anchovy spawners and recruits in South African waters. S Afr J Mar Sci 5:901-917
24. Heath RGM, Randall RM (1989) Foraging ranges and movements of Jackass Penguins (Spheniscus demersus) established through radio telemetry. J Zool 217:367-379
25. Hockey PAR, Dean WRJ, Ryan PG (2005) Roberts birds of Southern Africa, 7th edn. John Voelcker Bird Book Fund, Cape Town
26. Kemper J (2006) Heading towards extinction? Demography of the African Penguin in Namibia. PhD thesis, University of Cape Town, South Africa
27. Klages NTW, Willis AB, Ross GJB (1992) Variability in the diet of the Cape Gannet at Bird Island, Algoa Bay, South Africa. S Afr J Mar Sci 12:761-771
28. Kreiner A, van der Lingen CD, Fréon P (2001) A comparison of condition factor and gonadosomatic index of sardine Sardinops sagax stocks in the northern and southern Benguela upwelling ecosystems, 1984-1999. S Afr J Mar Sci 23:123-134
29. Le Clus F (1985) Effect of a warm water intrusion on the anchovy fishery off Namibia: 1984. Collect Sci Pap Int Comm Southeast Atl Fish 12(1):99-106
30. Le Clus F (1986) Aftermath of environmental perturbations off Namibia relative to the anchovy stock, and comparative pilchard spawning. Collect Sci Pap Int Comm Southeast Atl Fish 13(2):19-26
31. Makhado AB, Crawford RJM, Underhill LG (2006) Impact of predation by Cape Fur Seals Arctocephalus pusillus pusillus on Cape Gannets Morus capensis at Malgas Island, Western Cape, South Africa. Afr J Mar Sci 28:681-687
32. Marks MA, Brooke RK, Gildenhuys AM (1997) Cape fur seal Arctocephalus pusillus predation on Cape Cormorants Phalacrocorax capensis and other birds at Dyer Island, South Africa. Mar Ornithol 25:9-12
33. Newman GG (1970) Stock assessment of the pilchard Sardinops ocellata at Walvis Bay, South West Africa. Invest Rep Sea Fish Res Inst South Afr 85:1-13
34. Petersen SL, Ryan PG, Gremillet D (2006) Is food availability limiting African Penguins Spheniscus demersus at Boulders? A comparison of foraging effort at mainland and island colonies. Ibis 148:14-26
35. Rand RW (1963a) The biology of guano-producing seabirds. 4. Composition of colonies on the Cape islands. Invest Rep Sea Fish Res Inst South Afr 43:1-32
36. Rand RW (1963b) The biology of guano-producing seabirds. 5. Composition of colonies on the South West African islands. Invest Rep Sea Fish Res Inst South Afr 46:1-26
37. Randall RM, Ross GJB (1979) Increasing population of Cape Gannets on Bird Island, Algoa Bay, and observations on breeding success. Ostrich 50:168-175
38. Schwartzlose RA, Alheit J, Bakun A, Baumgartner TR, Cloete R, Crawford RJM, Fletcher WJ, Green-Ruiz Y, Hagen E, Kawasaki T, Lluch-Belda D, Lluch-Cota SE, MacCall AD, Matsuura Y, Nevarez-Martinez MO, Parrish RH, Roy C, Serra R, Shust KV, Ward MN, Zuzunaga JZ (1999) Worldwide large-scale fluctuations of sardine and anchovy populations. S Afr J Mar Sci 21:289-347
39. Shelton PA, Crawford RJM, Cooper J, Brooke RK (1984) Distribution, population size and conservation of the Jackass Penguin Spheniscus demersus. S Afr J Mar Sci 2:217-257
40. Thomas RM (1985) Age studies on pelagic fish in the South-East Atlantic, with particular reference to the South West African pilchard, Sardinops ocellata. PhD thesis, University of Cape Town, South Africa
41. Thomas RM (1986) The Namibian pilchard: The 1985 season, assessment for 1952-1985 and recommendations for 1986. Collect Sci Pap Int Comm Southeast Atl Fish 13(2):243-269
42. Underhill LG, Crawford RJM (2005) Indexing the health of the environment for breeding seabirds in the Benguela ecosystem. ICES J Mar Sci 62:360-365
43. Underhill LG, Crawford RJM, Wolfaardt AC, Whittington PA, Dyer BM, Leshoro TM, Ruthenberg M, Upfold L, Visagie J (2006) Regionally coherent trends in colonies of African Penguins Spheniscus demersus in the Western Cape, South Africa, 1987-2005. Afr J Mar Sci 28:697-704
44. Waller LJ, Underhill LG (2007) Management of avian cholera Pasteurella multocida outbreaks on Dyer Island, South Africa, 2002-2005. Afr J Mar Sci 29:105-111
45. Williams AJ, Ward VL (2002) Catastrophic cholera: Coverage, causes, context, conservation and concern. Bird Numbers 11(2):2-6