Key sites for the conservation of waterbirds (Aves) in
Durban Bay, South Africa. Durban Museum Novitates 30: 1-14. Forty-eight monthly counts of waterbirds
were conducted in Durban Bay (July 1999-June 2003). A total of 47 227 waterbirds of 79 species were
recorded. Eighteen waterbird species were significantly more abundant in summer while seven were
significantly more abundant in winter. Centre Bank supported 40.6% of all waterbirds, comprising mainly
Palearctic waders and roosting gulls and terns. Distinct species assemblages of plovers (Charadridae) and
sandpipers (Scolopacidae) were associated with the two most selected of the intertidal sites: Bayhead and
Centre Bank. The assemblage at Centre Bank included three large-bodied Palearctic species (Greenshank,
Grey Plover and Whimbrel), all of which occurred in abundance there and showed strong selection for this
site. The assemblage which showed strong site selection for Bayhead consisted of both resident and
Palearctic species, five of which are known to favour finer sediments (Ringed and Kittlitz's plovers,
Common and Terek sandpipers, and Little Stint). Bayhead had a higher number of waterbird species that
occurred at higher densities, when compared with Centre Bank, and showed the highest species-diversity
ranking of all sites. This may be a result of the more heterogenous nature of this area. Sporting Bodies-
Pelican Island had high densities of, and strong site selection by, piscivorous species and species associated
with the semi-natural shorelines of this area. This site, however, supported only 8.6% of all waterbirds
counted during the study period. Fish Wharf-Yacht Basin had the highest numbers and densities of Greyheaded
Gulls, which utilized this area when scavenging. Other waterbird species were poorly represented
here and this site had the lowest species-diversity ranking. Commercial harbour areas were the least
attractive for waterbirds in terms of species-abundance values, densities and site selection. This is largely
attributed to the artificial nature of these areas. It is recommended that Centre Bank receive highest priority
for conservation status within the Bay. Reasons for conserving this site include: (a) the high overall
abundance of waterbirds that this site supports; (b) the unique assemblage of Palearctic waders that utilizes
this area, and the overall contribution that this has to waterbird diversity in the Bay; and (c) the importance
of this site to roosting gulls and terns, particularly Kelp Gull which has regionally, and potentially globally,
significant numbers in this area.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1001003 |
| Date | 29 July 2005 |
| Creators | McInnes, AM, Allan, DG, Malan, G |
| Publisher | Durban Museum Novitates |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | Durban Museum Novitates |
Page generated in 0.0048 seconds