Cape Gannet (Morus capensis) Science Article 3 abstract Cape Gannets Morus capensis breed at only six coastal islandsoff Namibia and South Africa (Table 1, Fig. 1). They are thethird most-ringed birds in southern Africa, with some 140 000ringed since 1950 (Oschadleus & Underhill 1999). Most ringingrecords since 1975 have been captured electronically. Oschadleus, H.D. & […]
Category: Suliformes
Trends in numbers of Cape gannets (Morus capensis),1956/1957-2005/2006, with a consideration of theinfluence of food and other factors
Cape Gannet (Morus capensis) Science Article 4 abstract Cape gannets (Morus capensis) breed at six colonies in Namibia and South Africa. Population size averaged about 250 000 pairs overthe period 1956/1957-1968/1969 and about 150 000 pairs from 1978/1979 to 2005/2006. Over the whole 50-y period, numbers atthe three Namibian colonies fell by 85-98%, with greater […]
Between air and water: the plunge dive of the CapeGannetMorus capensis
Cape Gannet (Morus capensis) Science Article 5 abstract Gannets have one of the most spectacular prey-capture behaviours of all marine predators,plummeting from up to 30 m into the water, where they seize fish with their razor-sharpbeaks. However, there is little detailed information on this brief behaviour. In January and December 2002, we monitored the biomechanics […]
BODY COMPOSITION, FAT RESERVES, AND FASTING CAPABILITY OF CAPE GANNET CHICKS
Cape Gannet (Morus capensis) Science Article 6 abstract Age-related changes in lipid, water, and non-lipid content and energy density of four major body parts (integument, viscera, leg and pectoral muscles, and carcass) of Cape Gannet chicks, juveniles, and adults were studied. The proportion ofwater was typically high for neonates and decreased during development to near […]
CAPE FUR SEAL ARCTOCEPHALUS PUSILLUS CATCHES CAPE GANNET MORUSCAPENSIS ASHORE AT MALGAS ISLAND
Cape Gannet (Morus capensis) Science Article 2 abstract At 12h15 on 20 September 1995, on approach to Malgas Island (3303S, 1755E) in the West Coast National Park, Western Cape Province, South Africa, we observed an adult bull CapeFur Seal Arctocephalus pusillus on the island near a small group of Cape Gannet Morus capensis nests. It […]
FOOD TRANSIT RATES IN CAPE GANNETS AND JACKASS PENGUINS
Cape Gannet (Morus capensis) Science Article 7 abstract Food transit rates in the JackassP enguin (Spheniscusd emersus), a piscivorous seabird, are slower (Duffy et al. 1985) than rates of birds with other diets (Warner 1981). However, digestive performance by the Jackass Penguin may not be typical of fish-eating seabirds. Food transit rates through the digestive […]
FIRST RECORD OF THE CAPE GANNET MORUS CAPENSIS FOR PERUAND THE PACIFIC OCEAN
Cape Gannet (Morus capensis) Science Article 1 abstract The Cape Gannet Morus capensis is an endemic seabird to southern Africa, breeding on offshore islands off Namibia and South Africa (Harrison 1985). After breeding, dispersal takes place as far as Mozambique, rarely Tanzania, on the east coast of Africa, and to the Gulf of Guinea on […]
ORGANOCHLORINE RESIDUES AND EGGSHELL THINNING IN WOOD STORKS AND ANHINGAS
Anhinga (Anhinga anhinga) Science Article 3 abstract All 10 Wood Stork eggs collected at Merritt Island National Wildlife Refuge in 1973 contained residues of DDE (geometric mean 4.0 ppm wet weight) and PCBs (1.2 ppm). Nine other organochlorines were found at lower frequencies in the eggs. Eggshells from the recent period were 8.9% thinner (P […]
Energetics and Spread-Winged Behavior of Anhingas in Florida
Anhinga (Anhinga anhinga) Science Article 2 abstract Metabolic rates and body temperatures of four captive Anhingas(Anhinga anhinga) were measured over a range of ambient temperatures. In addition,Anhingas were observed in the field in an attempt to correlate the frequencyof behaviors, such as wing-spreading, with environmental conditions, such as theintensity of solar radiation and ambient temperature. […]
BEHAVIOR AND SEX ROLES OF NESTING ANHINGAS AT SAN BLAS, MEXICO
Anhinga (Anhinga anhinga) Science Article 4 abstract Breeding behavior and sex roles of nesting Anhingas were studied in San Blas, Nayarit, Mexico during July and August 1975. The Anhingas nested in a mixed species colony of egrets, herons, and cormorants. The egg-laying period for Anhingas was 21 days. Anhingas built nests in the open areas […]