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Adverse impacts of hypoxia on aquatic invertebrates: A meta-analysis
Science of the Total Environment ( IF 8.2 ) Pub Date : 2018-10-17 , DOI: 10.1016/j.scitotenv.2018.10.225
Nika Galic , Tanner Hawkins , Valery E. Forbes

Hypoxia in aquatic ecosystems is often a result of anthropogenic activities, such as increased nutrient loading, originating from agriculture or urbanization, as well as global warming. Aquatic invertebrates are especially important in ecosystems due to their central role in secondary production and in dynamics of food webs. To better understand impacts of oxygen availability on key physiological processes in invertebrates, we conducted a literature search and synthesized the findings of published studies. We found 55 studies that quantified impacts of hypoxia on feeding, growth, reproduction and respiration rates in 54 different aquatic invertebrate species. We applied non-linear regression models which took into account phylogenetic correlation in the data set. Fitting Michaelis-Menten models, we found that there were differences in how different processes responded to a decline in oxygen availability. Respiration rates were halved at highest oxygen concentration (6.44 mg O2/L), followed by reproductive (3.66 mg O2/L), growth (1.77 mg O2/L) and, finally, feeding rates (0.77 mg O2/L). Our findings confirm observations that reproduction is highly sensitive as organisms quickly reduce their reproductive output when exposed to stressful conditions. As long as they have sufficient reserves, organisms continue growing even under stressful conditions, and we confirmed that growth was not very sensitive to a decline in oxygen availability. We discuss potential impacts of global warming on oxygen availability and demand for aquatic macroinvertebrates. Given that oxygen availability is declining in many ecosystems, we can expect that organismal responses will be increasingly compromised with potential consequences for ecosystems and the services they deliver.



中文翻译:

缺氧对水生无脊椎动物的不利影响:一项荟萃分析

水生生态系统中的缺氧通常是人为活动的结果,例如来自农业或城市化的营养物增加以及全球变暖。由于无脊椎动物在次级生产和食物网动态中的核心作用,它们在生态系统中尤其重要。为了更好地了解氧气供应对无脊椎动物关键生理过程的影响,我们进行了文献搜索并综合了已发表研究的结果。我们发现有55项研究量化了低氧对54种不同水生无脊椎动物物种的摄食,生长,繁殖和呼吸速率的影响。我们应用了非线性回归模型,该模型考虑了数据集中的系统发育相关性。拟合Michaelis-Menten模型,我们发现,不同的过程对氧气供应量下降的反应方式存在差异。在最高氧气浓度(6.44 mg O2 / L),其次是生殖(3.66 mg O 2 / L),生长(1.77 mg O 2 / L),最后是进食速度(0.77 mg O 2/ L)。我们的发现证实了观察结果,即繁殖对生物高度敏感,因为有机体在受到压力时会迅速降低其生殖能力。只要有足够的储备,有机体即使在压力条件下也可以继续生长,我们证实了生长对氧气利用率的下降不是很敏感。我们讨论了全球变暖对氧气供应和对水生无脊椎动物的需求的潜在影响。鉴于许多生态系统中的氧气供应量正在下降,我们可以预期,生物反应将越来越受到损害,从而给生态系统及其提供的服务带来潜在的后果。

更新日期:2018-10-27
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