Hart Lorinda A, Bowker Meyrick B, Tarboton Warwick, Downs Colleen T
School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa.
PLoS One. 2014 Mar 24;9(3):e92588. doi: 10.1371/journal.pone.0092588. eCollection 2014.
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.
南非的马普托兰-蓬多兰-奥尔巴尼地区被认定为生物多样性热点地区和特有物种中心。蜻蜓目昆虫是淡水生态系统健康状况的良好指示物种。因此,我们编制了一份截至目前在伊西曼加利索湿地公园记录的蜻蜓目物种清单。然后,我们从特有性、保护状况以及作为指示物种的潜力等方面详细介绍了重要物种。最后,我们比较了公园内不同采样地点的蜻蜓目昆虫群落,以说明栖息地的重要性。在两项正式调查期间鉴定出的物种以及在研究期间的偶然观察结果与现有数据库相结合,为伊西曼加利索湿地公园编制了一份准确且最新的物种清单。然后对本研究的数据进行分析,以确定哪些水体的物种组成最为相似。还确定了每个研究区域的蜻蜓生物指数(DBI)值。我们在伊西曼加利索湿地公园记录了68种蜻蜓目物种,为该地区的夸祖鲁-纳塔尔野生动物保护局(Ezemvelo KwaZulu-Natal Wildlife)数据库新增了13个物种。这使得伊西曼加利索湿地公园的蜻蜓目物种总数达到86种。其中有8个物种被列入红色名录,12个物种在南非仅分布于夸祖鲁-纳塔尔省北部的沿海平原,其余物种广泛分布于南部非洲热带草原。分析表明,具有相似栖息地的水体中蜻蜓目物种群落最为相似。伊西曼加利索湿地公园被认定为蜻蜓目多样性和特有性的重要区域,这一趋势也在DBI值中得到体现。现有物种群落的变化将表明生态系统内部的变化,因此本物种记录为该地区提供了必要的基线数据。因此,物种保护工作应针对不同栖息地类型的水体,以保护更丰富的物种多样性。