Recent Trends of the Kelp Gull (Larus dominicanus) in South Africa

Abstract

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A synthesis of three decades of socio-ecological change in False Bay, South Africa: setting the scene for multidisciplinary research and management

“…In South Africa, anchovy and sardine are also important prey of Cape cormorants, Cape gannets and greater crested terns (Hockey et al, 2005). Numbers of Cape cormorants increased in False Bay in the late 2000s beyond previously observed levels, after they experienced substantial decreases farther north (Crawford et al, 2016). They breed mainly on the cliffs at Batsata Cove and Cape Point in the and 1995-1997 (49 pairs), but increased slightly (59 pairs) by 2011-2013 (Crawford et al, 1999;Crawford et al, 2015).…”

“…Respectively, 45 pairs and 120 pairs of these species were breeding in -1981and 15 and 41 pairs in 2008(Crawford et al, 2012. Kelp gulls have bred at nine localities in and around False Bay, where numbers breeding increased from 310 pairs during 1976-1980 to more than 2,000 pairs currently (Whittington et al, 2016; P.G. Ryan, unpublished results).…”

“…Ryan, unpublished results). Numbers of all three species have decreased on the west coast, but have increased in the south of South Africa (Crawford et al, 2015;Whittington et al, 2016). Some breeding colonies of seabirds have disappeared from the False Bay area.…”

“…As the human population in the greater Cape Town area has increased, seabirds have become a source of enjoyment for many people and, penguins in particular, a major generator of revenue for the Western Cape (e.g., Lewis et al, 2012). However, predation by natural and introduced predators (dogs and cats) is an issue at some mainland colonies, and some gull colonies are subject to illegal disturbance and subsistence exploitation (Whittington et al, 2016). Specialist coastal birds have for the most part decreased due to increased development and disturbance, as well as larger-scale challenges facing long-distance migrants.…”

Phylogenetic Placement of a Schistosome from an Unusual Marine Snail Host, the False Limpet (Siphonaria lessoni) and Gulls (Larus dominicanus) from Argentina with a Brief Review of Marine Schistosomes from Snails

“…The morphology of these distinctive but unknown eggs (Rohde, 1978) is very similar to the eggs described for G. huttoni (a species with long, thin adults) obtained from an experimental infection using cercariae derived from the marine snail H. antillarum (Leigh, 1953(Leigh, , 1955. Even though the gull from the present study was collected from an inland lake, gulls are known to travel large distances and several species spend time in both marine and freshwater (lakes, rivers) habitats (e.g., Kilpi and Saurola, 1983;Capllonch, 2004), though some are also resident birds (e.g., Whittington et al, 2009). (Appleton, 1982(Appleton, , 1986Rohde, 1978).…”