Colleen Downs

Prof. Colleen Downs

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Research Focus & Metrics

Academic Career Length

37Years (1990-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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24 March 2014 in PLOS ONE
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Journal Article
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LHLorinda A. Hart
Lorinda A. Hart
MBMeyrick B. Bowker
Meyrick B. Bowker
WTWarwick Tarboton
Warwick Tarboton
CDColleen Downs
Colleen Downs
Maputaland–Pondoland–Albany, South Africa has been identified as a biodiversity hotspot and centre for endemism. Odonata make good indicators of freshwater ecosystem health. Consequently we compiled a list of Odonata species recorded to date in the iSimangaliso Wetland Park. We then detailed important species in terms of endemism, conservation status, and potential as indicator species. Finally, we compared Odonata assemblages of different sites sampled within the park to illustrate habitat importance. Species identified during two formal surveys and incidental observations made during the study period were combined with an existing database to compile an accurate and up to date species list for the iSimangaliso Wetland Park. Data from this study were then analyzed to determine which water bodies had the most similar species composition. The Dragonfly Biotic Index (DBI) value of each study area was also determined. We recorded 68 odonate species in the iSimangaliso Wetland Park, adding 13 species to the Ezemvelo KwaZulu-Natal Wildlife database for the area. This brings the total number of Odonata species for the iSimangaliso Wetland Park to 86. Eight species are red-listed, 12 are restricted in South Africa to the coastal plains of northern KwaZulu-Natal, and the remainder occurs widely across the southern African savanna. Analyses indicate that species odonate assemblages were most similar in water bodies with comparable habitats. iSimangaliso Wetland Park is identified as an important area for Odonata diversity and endemism, a trend also reflected by the DBI values. Shifts in the existing species assemblages would indicate changes within the ecosystem and thus this species account provides necessary baseline data for the area. Species Conservation efforts should thus target water bodies of varying habitat types to protect greater species diversity.

4 January 2021 in Nature Ecology & Evolution
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MGMark A. Goddard
Mark A. Goddard
ZDZoe Davies
Zoe Davies
SGSolène Guenat
Solène Guenat
MFMark J. Ferguson
Mark J. Ferguson
JFJessica C. Fisher
Jessica C. Fisher
MDMartin Dallimer
Martin Dallimer

1 July 2018 in Biological Conservation
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Journal Article
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MEMohamed A. Ezat
Mohamed A. Ezat
CFCamille J. Fritsch
Camille J. Fritsch
CDColleen Downs
Colleen Downs

1 February 2015 in Journal for Nature Conservation
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Journal Article
Closed access
TRTharmalingam Ramesh
Tharmalingam Ramesh
CDColleen Downs
Colleen Downs

10 June 2011 in Biological Invasions
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Journal Article
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LJLorinda A. Jordaan
Lorinda A. Jordaan
SJSteven D. Johnson
Steven D. Johnson
CDColleen Downs
Colleen Downs

5 June 2006 in Animal Conservation
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Journal Article
Open access
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DPD. J. Pain
D. J. Pain
TMT. L. F. Martins
T. L. F. Martins
MBM. Boussekey
M. Boussekey
SDS. H. Diaz
S. H. Diaz
CDColleen Downs
Colleen Downs
IWI. D. Widmann
I. D. Widmann
Wild parrots represent one of the greatest commercial interests in the legal trade in wild birds. Although it is difficult to quantify, there is a considerable illegal trade in wild parrots. Thirty‐six per cent of the world's parrot species are listed by the International Union for the Conservation of Nature as threatened or near threatened, and 55% of these are threatened to some degree by trade. In this paper, we investigate the impact of protection on the number of nests that failed because of nestlings being taken by humans (hereafter nest take) and on nesting success in parrots. We collate data on parrot nest take from published and unpublished studies from Africa, Asia and Australasia, including countries and sites with and without national and local parrot protection measures in place. Nest take was insignificant in Australia, where all studies were from areas with both local and national protection. For less developed countries, levels of nest take were variable between studies, spanning the whole range from 0 to 100%. Protection significantly reduced nest take and correspondingly increased nesting success. Our results corroborate those for the Neotropics; thus, the advantages of protection appear to be independent of geographical location or political and economic conditions. We analysed data on legal trade in wild‐caught parrots before and after implementation of the 1992 Wild Bird Conservation Act (which practically eliminated import of parrots to the USA) and found that there was no apparent shift in parrot imports to other global regions from the Neotropics. We suggest that conservation of parrots globally would benefit from similar legislation introduced in other regions, such as the EU (15), which is responsible for more than 60% of global imports of wild parrots.