Neotropical stingless bees display a strong response in cold tolerance with changes in elevation.
Neotropical stingless bees display a strong response in cold tolerance with changes in elevation.
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DOI：
10.1093/conphys/coac073
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发表时间：
2022
影响因子：
2.7
通讯作者：
中科院分区：
文献类型：
--
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预计热带传粉者将因气候变化而受到重大影响，但其热生物学方面仍基本未知。我们调查了无刺蜜蜂的耐热性，这是热带传粉者中最重要的生态、经济和文化群体。我们评估了在哥伦比亚安第斯山脉的两个海拔高度（200和1500米）的17种（12属）的临界温度下限（CTMin）和上限（CTMax）的变化。此外，我们还研究了个体大小（翅间距离，ITD）、多毛（胸毛长度）和颜色（亮度值）对蜜蜂耐热性的影响。由于无刺养蜂人经常在海拔梯度上重新安置他们的殖民地，作为探索气候变化的潜在社会反应的初步尝试，我们还在两个海拔高度的三个物种的巢穴中跟踪了几周的孵化温度和湿度。我们发现CTMin随海拔升高而降低，而CTMax在海拔之间相似。CTMin和CTMax随着ITD、毛长和亮度值的增加而增加（耐寒性低和耐热性高），但这些关系很弱，最多解释10%的方差。CTMin和CTMax均未显示显著的系统发育信号。在低海拔地区，巢温与环境昼夜变化的关系更为密切，但在高海拔地区，巢温是恒定的且较高。与此相反，育雏巢湿度是均匀的一整天，无论海拔。CTMin的反应较强，海拔之间的CTMax相似，遵循一种模式的变化记录在广泛的分类群，通常被称为布雷特的热不变假设。我们的研究结果表明，不同的热敏感性和潜在的热适应当地气候，这支持正在进行的保护政策，以限制殖民地的长距离搬迁。他们还揭示了如何可塑性巢温度调节可以跨越海拔。
Tropical pollinators are expected to experience substantial effects due to climate change, but aspects of their thermal biology remain largely unknown. We investigated the thermal tolerance of stingless honey-making bees, the most ecologically, economically and culturally important group of tropical pollinators. We assessed changes in the lower (CTMin) and upper (CTMax) critical thermal limits of 17 species (12 genera) at two elevations (200 and 1500 m) in the Colombian Andes. In addition, we examined the influence of body size (intertegular distance, ITD), hairiness (thoracic hair length) and coloration (lightness value) on bees’ thermal tolerance. Because stingless beekeepers often relocate their colonies across the altitudinal gradient, as an initial attempt to explore potential social responses to climatic variability, we also tracked for several weeks brood temperature and humidity in nests of three species at both elevations. We found that CTMin decreased with elevation while CTMax was similar between elevations. CTMin and CTMax increased (low cold tolerance and high heat tolerance) with increasing ITD, hair length and lightness value, but these relationships were weak and explained at most 10% of the variance. Neither CTMin nor CTMax displayed significant phylogenetic signal. Brood nest temperature tracked ambient diel variations more closely in the low-elevation site, but it was constant and higher at the high-elevation site. In contrast, brood nest humidity was uniform throughout the day regardless of elevation. The stronger response in CTMin, and a similar CTMax between elevations, follows a pattern of variation documented across a wide range of taxa that is commonly known as the Brett’s heat-invariant hypothesis. Our results indicate differential thermal sensitivities and potential thermal adaptations to local climate, which support ongoing conservation policies to restrict the long-distance relocations of colonies. They also shed light on how malleable nest thermoregulation can be across elevations.
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影响因子：
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作者：
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通讯作者：
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