Historical changes in bumble bee body size and range shift of declining species
Historical changes in bumble bee body size and range shift of declining species
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熊蜂体型的历史变化和衰退物种的范围转移
DOI：
10.1007/s10531-019-01893-7
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发表时间：
2020
影响因子：
3.4
通讯作者：
Sandra M. Rehan
中科院分区：
文献类型：
--
作者：
Sabine S. Nooten;Sandra M. Rehan
世界范围内的熊蜂数量正在减少，其重要的生态系统服务正在减少，其潜在机制是物种特异性的、多方面的。这引发了对历史收藏的长期评估的增加，这些评估提供了有关人口趋势和分布变化的宝贵信息。然而，博物馆标本还包含重要的生态信息，包括很少测量的形态特征。对博物馆标本进行基于特征的评估，通过跟踪随时间的变化，提供有关人口趋势潜在机制的额外信息。在这里，我们使用了跨越 125 年时间范围内的四种熊蜂物种的博物馆标本来：（i）比较减少和增加物种的体型大小，（ii）评估上个世纪的种内趋势，以及（iii）调查地理分布随时间的变化。我们发现减少的熊蜂物种比增加的熊蜂物种更大。目前这四个物种都比一个世纪前要小。对于体型较大的物种，种内尺寸下降更为明显。根据我们的采样，减少和增加的物种显示出海拔的向上变化，与历史记录相比，减少的物种最近显示出额外的地理变化。种内体型下降可能代表物种对不利环境条件的适应，并且可能是补充传统物种脆弱性评估的有用指标。我们强调将基于性状的评估纳入未来调查物种衰退的研究中的实用性。
Bumble bees are declining worldwide, their vital ecosystem services are diminishing and underlying mechanisms are species specific and multifaceted. This has sparked an increase in long-term assessments of historical collections that provide valuable information about population trends and shifts in distributions. However, museums specimens also contain important ecological information, including rarely measured morphological traits. Trait-based assessments of museums specimens provide additional information on underlying mechanisms of population trends, by tracking changes over time. Here, we used museum specimens of four Bombus species, spanning a timeframe of 125 years to: (i) compare body size of declining and increasing species, (ii) assess intra-specific trends over the last century, and (iii) investigate shifts in geographical distribution over time. We found that declining Bombus species were larger than increasing ones. All four species were smaller in current time than a century ago. Intra-specific size declines were more pronounced for larger-bodied species. With our sampling, declining and increasing species showed an upward shift in elevation, and declining species showed an additional geographic shift in recent times as compared to historic records. Intra-specific body size declines may represent species adaptation to unfavorable environmental conditions, and may be a useful metric to complement traditional species vulnerability assessments. We highlight the utility of incorporating trait-based assessments into future studies investigating species declines.
DOI：
10.1073/pnas.1703008114
发表时间：
2017-10-10
影响因子：
11.1
作者：
Helm, Bryan R.;Rinehart, Joseph P.;Bowsher, Julia H.
通讯作者：
Bowsher, Julia H.