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It is the ambience, not the menu. Prey availability does not drive habitat selection by the endangered Pyrenean desman
Aquatic Conservation: Marine and Freshwater Ecosystems ( IF 2.4 ) Pub Date : 2021-04-22 , DOI: 10.1002/aqc.3563
Amaiur Esnaola 1, 2 , Vanessa Mata 3 , Aitor Arrizabalaga‐Escudero 1 , Jorge González‐Esteban 4 , Aitor Larrañaga 5 , Hugo Rebelo 3, 6 , Arturo Elosegi 5 , Joxerra Aihartza 1
Affiliation  

  1. The Pyrenean desman (Galemys pyrenaicus) is an endangered stream-dwelling insectivore endemic to the Iberian Peninsula and the north of the Pyrenees. It favours riffles over slow habitats such as runs or pools, yet it is still unclear whether habitat preference is based on prey availability or on other factors, such as mechanical constraints on its hunting habits.
  2. Desman diet and prey selection were analysed along the pristine Elama Stream and the slightly modified Leitzaran Stream in the Basque Country, Spain.
  3. In each stream the prey consumed were identified by metabarcoding 94 desman faeces, and prey availability characterized from 10 Surber samples taken in each habitat type (riffles, runs and pools). Invertebrates were sorted and identified, the biomass of each taxon was calculated, and their DNA was also extracted, amplified using PCR, and sequenced to build a reference database.
  4. Prey availability and diet varied between streams. Desmans positively selected shredders and invertebrates that live on the substrate, and selected against taxa that live in fine sediment, taxa with hard shells or those that are highly mobile. The diet of desmans was more selective in the Elama, the stream with better ecological status. Food availability did not differ among habitats, and therefore does not explain the preference of desmans for riffles; rather, mechanical constraints to deal with buoyancy and physical habitat heterogeneity were hypothesized to be the reason behind the habitat preference.
  5. The results suggest that promoting the formation of riffles in streams can improve the situation of some desman populations living in degraded habitats.


中文翻译:

这是氛围,而不是菜单。猎物的可用性并没有推动濒临灭绝的比利牛斯山脉的栖息地选择

  1. Pyrenean desman ( Galemys pyrenaicus ) 是一种濒临灭绝的栖息于溪流的食虫动物,分布于伊比利亚半岛和比利牛斯山脉以北。它更喜欢浅滩而不是慢跑或水池等缓慢的栖息地,但目前尚不清楚栖息地偏好是基于猎物的可用性还是其他因素,例如对其狩猎习惯的机械限制。
  2. 沿着西班牙巴斯克地区的原始 Elama Stream 和稍微修改的 Leitzaran Stream 分析了 Desman 的饮食和猎物选择。
  3. 在每个溪流中,消耗的猎物通过元条形码识别出 94 条 desman 粪便,以及从每个栖息地类型(浅滩、小溪和水池)采集的 10 个 Surber 样本中表征的猎物可用性。对无脊椎动物进行分类和鉴定,计算每个分类单元的生物量,还提取了它们的 DNA,使用 PCR 扩增,并测序以建立参考数据库。
  4. 不同溪流之间的猎物可用性和饮食各不相同。Desmans 积极选择生活在基质上的碎纸机和无脊椎动物,并选择生活在细泥沙中的类群、硬壳类群或高度移动的类群。在生态状况较好的 Elama 溪流中,desmans 的饮食更具选择性。栖息地之间的食物供应量没有差异,因此不能解释小矮人对浅滩的偏爱;相反,处理浮力和物理栖息地异质性的机械约束被假设是栖息地偏好背后的原因。
  5. 结果表明,促进溪流中浅滩的形成可以改善一些生活在退化栖息地的desman种群的状况。
更新日期:2021-04-22
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