A new algorithm for the identification of dives reveals the foraging ecology of a shallow-diving seabird using accelerometer data
A new algorithm for the identification of dives reveals the foraging ecology of a shallow-diving seabird using accelerometer data
复制标题
DOI：
10.1007/s00227-017-3106-0
复制
发表时间：
2017-04-01
期刊：
影响因子：
2.4
通讯作者：
Quillfeldt, P.
中科院分区：
文献类型：
--
作者：
Cianchetti-Benedetti, M.;Catoni, C.;Quillfeldt, P.
喂养事件的识别对于我们对海鸟觅食生态的理解至关重要。技术制造了小型设备，例如时间深度录制器（TDR）和加速度计。但是，TDR可能不足以识别浅水潜水，而加速度计可能会显示出更小的时间尺度的更微妙的行为。由于TDR的局限性，迄今为止，对许多浅水潜水海鸟的觅食生态已经进行了很少的研究。因此，我们开发了一种算法，以鉴定仅使用加速度计数据的浅水潜水海鸟物种（Scopoli的剪水水）中的潜水事件。比较了使用加速度计或TDR鉴定潜水的准确性。此外，我们测试了在繁殖的不同阶段和觅食跳闸类型的情况下，剪切器的觅食行为是否发生了变化。从2015年6月12日至9月8日，在Linosa岛（35度51'33'n; 12度51'34'E）收集了数据，该数据是通过在Scopoli的60份Shearwaters上部署加速度计数据记录仪的。四只鸟还配备了TDR。使用该算法，TDR仅记录了加速度计检测到的潜水的17.7％。总共82.3％的通过算法鉴定的潜水太短或浅而无法通过TDR检测。因此，TDR不够准确，无法检测到Scopoli的剪力层中的大多数潜水，这些剪切素的大部分觅食靠近海面。我们的数据表明，与晚幼鸡和孵化阶段相比，鸟类进行了短暂的觅食旅行，并在养鸡早期进行频率更高。此外，父母在短觅食旅行中更频繁地跳水。我们的结果表明，在短暂的觅食旅行和早期养鸡期间，Scopoli的剪力牵引者最大程度地提高了他们的觅食努力（例如潜水的数量，短途旅行）。
The identification of feeding events is crucial to our understanding of the foraging ecology of seabirds. Technology has made small devices, such as time-depth recorders (TDRs) and accelerometers available. However, TDRs might not be sensitive enough to identify shallow dives, whereas accelerometers might reveal more subtle behaviours at a smaller temporal scale. Due to the limitations of TDRs, the foraging ecology of many shallow-diving seabirds has been poorly investigated to date. We thus developed an algorithm to identify dive events in a shallow-diving seabird species, the Scopoli's shearwater, using only accelerometer data. The accuracy in the identification of dives using either accelerometers or TDRs was compared. Furthermore, we tested if the foraging behaviour of shear-waters changed during different phases of reproduction and with foraging trip type. Data were collected in Linosa Island (35 degrees 51'33 '' N; 12 degrees 51'34 '' E) from 12 June to 8 September 2015 by deploying accelerometer data loggers on 60 Scopoli's shearwaters. Four birds were also equipped with TDRs. TDRs recorded only 17.7% of the dives detected by the accelerometers using the algorithm. A total of 82.3% of dives identified by algorithm were too short or shallow to be detected by TDRs. Therefore, TDRs were not accurate enough to detect most of the dives in Scopoli's shearwaters, which foraged mostly close to the sea surface. Our data showed that birds performed shorter foraging trips and dived more frequently in the early chick-rearing period compared with the late chick-rearing and incubation phases. Furthermore, parents dived more frequently during short foraging trips. Our results suggest that Scopoli's shearwaters maximised their foraging effort (e.g. number of dives, short trips) during shorter foraging trips and during early chick-rearing.