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Establishment and post-hurricane survival of the non-native rio grande cichlid (Herichthys cyanoguttatus) in the greater New Orleans Metropolitan Area

机译:新奥尔良大都市地区非本地长慈鲷(Herichthys cyanoguttatus)的建立和飓风后的生存

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We conducted multiple surveys to determine the distribution of the non-native Herichthys cyanoguttatus (Rio Grande Cichlid) in the Greater New Orleans Metropolitan Area (GNOMA). First, in 20032004, we trapped H. cyanoguttatus in Lake Pontchartrain (an oligohaline estuary) to determine if this freshwater species occurred in estuarine habitats. Our goal was to test the prediction that H. cyanoguttatus used estuarine corridors to disperse. Second, we sampled and compared 16 GNOMA sites before and after the 2005 hurricanes to determine how H. cyanoguttatus populations responded. Finally, we monitored H. cyanoguttatus populations monthly over two years (20062007) at six sites within the GNOMA to determine if numbers continued to increase after the hurricanes. We confirmed that H. cyanoguttatus: 1) does occur in estuarine habitats (0 to 8 psu), 2) effectively survived the 2005 hurricanes, 3) has increased significantly from 2006 to 2007 at three of six GNOMA sites, 4) is currently found more often in urban sites, and 5) persisted through the atypically cold winter of 2009/2010.
机译:我们进行了多次调查,以确定在新奥尔良大都市区(GNOMA)上的非本地Herichthys cyanoguttatus(Rio Grande Cichlid)的分布。首先,在20032004年,我们在邦查特雷恩湖(寡盐河口)中捕获了H. cyanoguttatus,以确定这种淡水物种是否发生在河口生境中。我们的目标是检验蓝藻居然使用河口走廊分散的预测。其次,我们对2005年飓风前后的16个GNOMA站点进行了采样和比较,以确定蓝藻居群对种群的反应。最后,我们在两年内(20062007)每月在GNOMA内的六个地点监测蓝藻嗜血杆菌的种群,以确定飓风过后数量是否继续增加。我们确认H. cyanoguttatus:1)确实发生在河口栖息地(0至8 psu),2)在2005年飓风中有效幸存,3)从2006年至2007年在六个GNOMA站点中的三个站点显着增加,4)目前被发现5)在2009/2010年非典型寒冷的冬天持续了下来。

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