鱼的栖息地:鱼类栖息地和康复至关重要

Habitat-Based龙虾丰富的评价:一个案例研究的漏油事件

j·斯坦利·柯布和理查德·a·迈克尔·克兰西Wahle

doi:https://doi.org/10.47886/9781888569124.ch21

抽象的。——美国龙虾也通常是与岩石基质,提供了或可以修改到避难所,可能是一个重要的栖息地benthic-phase青少年早期。依赖shelter-providing栖息地不仅使可能的定义基本栖息地的龙虾还允许评估丰富区域范围的基础上的栖息地。在这里,我们描述了这样一个habitat-based评估,执行在回应一个罗德岛海岸的石油泄漏,美国。旁侧扫描声纳调查结果进行泄漏后表明,龙虾的栖息地受到石油的数量大约是9.8平方公里近15公里的海岸线。Postspill龙虾密度范围从0.24到1.63(龙虾m22影响地区龙虾锰在控制区域。定性(地图轮廓的龙虾密度)和定量(统计测试)方法提出了一个重大漏油事件的影响已经被我们的抽样检测。龙虾死亡总数的估计需要修复工作。我们计算的总数由覆盖区域轮廓的龙虾龙虾密度在栖息地地图上生成的旁侧扫描声纳,然后在每个等高线间距龙虾的密度乘以适当的龙虾栖息地的面积(鹅卵石和博尔德)等高线间距。计算损失,我们从prespill丰度减去postspill丰富。Prespill密度估计1.76锰,这是一个调整的平均空运样本六点罗德岛网站四个月前泄漏。 Calculations of loss based on habitat-specific density estimates were adjusted to reflect undersampling. The loss was estimated to be to be 9.0 × 106 lobsters. Variability associated with this loss estimate is large; 95% confidence intervals estimated that between 6.7 × 106 and 15.6 × 106 lobsters were lost. The calculated loss was very sensitive to changes in prespill density estimates; a change of 0.1 lobsters m22 resulted in a change of 0.75–0.9 × 106 lobsters lost. Habitatbased assessment of lobster population size is possible but requires detailed habitat maps and accurate density estimates. Natural variability and sampling limitations give such assessment a wide range of possible values. Nevertheless, the airlift sampling technique, together with sidescan sonar maps of habitat, could provide a powerful tool for estimating the abundance of inshore lobsters.