The potential impacts of the songbird trade on mixed-species flocking

The potential impacts of the songbird trade on mixed-species flocking
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鸣禽贸易对混合物种聚集的潜在影响

DOI:
10.1016/j.biocon.2018.04.015
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发表时间:
2018
影响因子:
5.9
通讯作者:
Farine
Farine
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Marthy;Farine

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混种集群是一种重要的鸟类社会系统,支持了大量的物种。目前的审查威胁混合羊群只研究了两种类型的人为压力:不同的土地利用强度和破碎化。我们强调鸟类贸易是东南亚许多混合物种群集物种的另一个主要潜在威胁。我们通过比较从印度尼西亚苏门答腊岛同一地点收集的近20年(1997年和2016年)的两个时期的集群数据的社交网络,研究了鸟类贸易的潜在间接影响。我们发现,这两个网络的结构显着相关。然而,在观察到的90个物种中,有49个先前被确定为鸟类贸易的一部分。这些物种经历了一个显着更大的网络中心随着时间的推移相比,非贸易的物种,在混合物种群集网络的结构损失。模拟进一步的干扰表明,羊群可能无法适应两个或两个以上交易物种的完全丧失。我们的研究结果表明,诱捕可能会导致羊群的退化,并最终可能导致其他物种的广泛下降,也依赖于混合物种群集。
Mixed-species flocking is an important avian social system that supports a large number of species. Current reviews of threats to mixed flocks have only examined two types of anthropogenic pressures: different land use intensity and fragmentation. We highlight the bird trade as another major potential threat for many mixed-species flocking species in Southeast Asia. We examine the potential indirect impact of the bird trade by comparing social networks of flocking data collected over two periods nearly 20 years apart (1997 and 2016) from the same site in Sumatra, Indonesia. We find that the structure of the two networks was significantly correlated. However, of the 90 species observed, 49 had previously been identified as part of the bird trade. These species experienced a significantly greater decrease in network centrality over time compared to the non-traded species, resulting in a loss of structure in the mixed-species flocking network. Simulating further disturbances suggests that flocks may not be resilient to the complete loss of two or more traded species. Our results suggest that trapping is likely to be contributing to the degradation of flocks, and ultimately could lead to the widespread declines in those other species that also rely on mixed-species flocking.
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