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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >When simple is better: Comparing two sampling methods to estimate green turtles abundance at coastal feeding grounds
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When simple is better: Comparing two sampling methods to estimate green turtles abundance at coastal feeding grounds

机译：简单时更好：比较两种采样方法以估算沿海觅食地的绿海龟数量

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摘要

Estimating population abundance of marine turtles on their feeding grounds is needed to implement effective conservation strategies, but is logistically challenging. In-water monitoring surveys on feeding grounds are costly, time-consuming, stressful to the animals (when capture is required), and typically requires complex analytical skills. Here, we compare two sampling methods to estimate abundance of green turtles on one of their major feeding grounds in the Egyptian Red Sea: a) snorkelling strip transect counts, a rarely used method on marine turtles; and b) capture-mark-recapture (CMR) using photo-identification. The main goals of this research were to: 1) identify the most cost-effective method to estimate in-water marine turtle abundance; and 2) provide the first abundance estimates for green turtles on their feeding grounds in the Red Sea. Both methods produced an average monthly abundance of approximately 30 turtles, with no significant difference between the two methodologies. The strip-transect method presented major logistical advantages, including easy field implementation, simple equipment, and only basic analytical skills. Furthermore, this method provided density estimates that can be used as index for population trends. However, limitations of this method included intensive field effort and potentially altered turtle behaviour due to the presence of the observers. By contrast, photo-identification and CMR models provided valuable information of population demography but required advanced analytical skills, did not provide a measure of density, and could prove challenging in areas where turtles are not acclimated to human presence. Our results suggest that the ease data collection and associated analysis of the strip transect method should be considered when implementing a monitoring program of wildlife to be used for management and conservation purposes. (C) 2015 Elsevier B.V. All rights reserved.
机译：为了实施有效的养护策略，需要估计海龟在其觅食地的种群数量，但这在逻辑上存在挑战。在饲喂场上进行水上监测调查成本高昂，费时，给动物带来压力（需要捕获时），并且通常需要复杂的分析技能。在这里，我们比较了两种采样方法，以估计埃及红海一个主要觅食地上绿海龟的数量：a）浮潜带状横断面计数，一种在海龟上很少使用的方法； b）使用照片识别的捕获标记再捕获（CMR）。这项研究的主要目的是：1）确定最具成本效益的方法来估计水中海龟的数量； 2）提供红海在其觅食地上的绿海龟的第一个丰度估计。两种方法平均每月产生大约30只海龟的丰度，两种方法之间没有显着差异。带状断面方法具有主要的后勤优势，包括易于现场实施，简单的设备以及仅具有基本的分析技能。此外，该方法提供了密度估计值，可用作人口趋势的指标。但是，这种方法的局限性包括大量的野外努力以及由于观察员的存在而可能改变的乌龟行为。相比之下，照片识别和CMR模型提供了人口人口统计学的有价值的信息，但需要先进的分析技能，无法提供密度的度量，并且在海龟不适应人类居住的地区可能具有挑战性。我们的结果表明，在实施用于管理和保护目的的野生动植物监测计划时，应考虑简易地带数据采集和带状样带方法的相关分析。 （C）2015 Elsevier B.V.保留所有权利。

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