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Potentially suitable habitat, connectivity and priority conservation areas for White-breasted waterhen ( Amaurornis phoenicurus ) and Bronze-winged jacana ( Metopidius indicus )
Wetlands ( IF 1.8 ) Pub Date : 2021-03-08 , DOI: 10.1007/s13157-021-01433-6
Souvik Barik , Goutam Kumar Saha , Subhendu Mazumdar

Wetlands, like East Kolkata Wetlands (EKW) in present study, are vulnerable to habitat alteration and other anthropogenic threats affecting avifauna. Consequently, prioritizing avifaunal conservation based on suitable habitats and their connectivity is essential. White-breasted waterhen (WBW, Amaurornis phoenicurus) and bronze-winged jacana (BWJ, Metopidius indicus) are two resident birds of EKW. We used MaxEnt for habitat suitability maps; assessed habitat connectivity in Circuitscape and mapped top 10% conservation priority areas in Zonation softwares. Both species had similar niche breadth and high niche overlap. The high suitability and moderate suitability areas for WBW was 0.02 km2 and 13.06 km2 respectively, while high suitability area for BWJ was absent and moderate suitability areas covered 6.73 km2. But, these suitable habitats mostly showed low and least connectivity. Finally, we found banks and dikes of wetlands, small vegetations therein and cropfields are important land-use classes in their projected suitable habitats and also in top 10% conservation priority areas. Use of chemical fertilizers and pesticides in the cropfields and clearing of bushes on the banks and dikes, as well as, the floating and emergent macrophytes in waterbodies with intensive commercial pisciculture are recorded as potential anthropogenic threats. Also ~80% of this top 10% conservation priority area are prone to moderate to high habitat transformation. Protection of remaining suitable habitats and their connectivity identified in this study, as well as, restoration of degraded habitats, and reduction of threats will ensure the conservation of WBW and BWJ in EKW and also in other wetlands in human-dominated landscapes.



中文翻译:

白胸水母(Amaurornis phoenicurus)和青铜翅贾卡纳(Metopidius indicus)的潜在栖息地,连通性和优先保护区

像本研究中的东加尔各答湿地(EKW)一样,湿地很容易受到栖息地变化和其他影响鸟类的人为威胁。因此,必须根据合适的栖息地及其连通性来优先进行鸟类保护。白胸水母(WBW,Amaurornis phoenicurus)和青铜翅贾卡纳(BWJ,Metopidius indicus)是EKW的两只常住鸟。我们将MaxEnt用于栖息地适应性地图;在Circuitscape中评估了栖息地的连通性,并在Zonation软件中绘制了优先级最高的10%的保护优先区域。两种物种的生态位宽度相似,生态位重叠率高。WBW的高适应性和中等适应性区域分别为0.02 km 2和13.06 km 2分别缺乏BWJ的高适宜性区域,中度适宜性区域覆盖了6.73 km 2。但是,这些合适的栖息地大多显示出较低的连通性,而连通性却最低。最后,我们发现湿地的堤岸和堤防,其中的小植被和耕地是重要的土地利用类别,它们在其预计的适宜生境中以及在优先保护的前10%区域中。作物田中使用化肥和杀虫剂以及清理堤岸和堤坝上的灌木丛以及商业化集约化养殖的水体中漂浮的和突生的大型植物被记录为潜在的人为威胁。此外,在这10%的优先保护重点地区中,约80%的地区容易发生中度到高度栖息地转化。保护剩余的合适栖息地及其在本研究中确定的连通性,以及退化的栖息地的恢复,

更新日期:2021-03-08
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