Strandberg Ursula, Arhonditsis George, Kesti Petri, Vesterinen Jussi, Vesamäki Jussi S, Taipale Sami J, Kankaala Paula
Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland.
Department of Physical and Environmental Sciences, University of Toronto, Toronto, Canada.
Aquat Sci. 2023;85(4):100. doi: 10.1007/s00027-023-00996-2. Epub 2023 Aug 31.
Shallow littoral areas in lakes are productive and highly diverse ecotonal zones, providing habitats for both invertebrate and vertebrate species. We developed a Bayesian modeling framework to elucidate the relationships between environmental drivers (lake typology, habitat, water chemistry, and latitude) and taxon richness, abundance, as well as the content of polyunsaturated fatty acids (PUFAs) in littoral macroinvertebrate communities in 95 boreal lakes. PUFAs, particularly arachidonic acid (ARA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), are critical micronutrients to maintain normal physiological functions in consumers. Lake typology was a significant predictor for PUFA content in the invertebrate assemblages, which was connected to taxon richness and/or abundance. Benthic communities in large humus-poor or nutrient-rich lakes displayed higher abundance, taxon richness, and more PUFA-rich taxa, whereas those in medium- and large-sized humic (color 30-90 mg Pt/L) and humus-rich lakes (color >90 mg Pt/L) were characterized by decreased abundance and subsequently low PUFA content. The abundance, taxon richness, and nutritional quality of the communities were also strongly related to latitude. Lakes with lower pH were characterized by lower benthic invertebrate diversity and low frequency of taxa with high somatic EPA and DHA content. The complexity of littoral habitats dominated by various macrophyte assemblages creates an environment that favors higher benthic abundance and increased presence of taxonomic groups with high PUFA content. Nutritional quality of benthic invertebrates for upper trophic levels can be modulated by a complex interplay between external stressors and abiotic factors that typically shape the structure of littoral benthic communities.
The online version contains supplementary material available at 10.1007/s00027-023-00996-2.
湖泊中的浅沿岸区域是高产且高度多样化的生态交错带，为无脊椎动物和脊椎动物物种提供栖息地。我们开发了一个贝叶斯建模框架，以阐明环境驱动因素（湖泊类型、栖息地、水化学和纬度）与95个北方湖泊沿岸大型无脊椎动物群落中的分类丰富度、丰度以及多不饱和脂肪酸（PUFA）含量之间的关系。PUFA，特别是花生四烯酸（ARA）、二十碳五烯酸（EPA）和二十二碳六烯酸（DHA），是维持消费者正常生理功能的关键微量营养素。湖泊类型是无脊椎动物群落中PUFA含量的重要预测指标，这与分类丰富度和/或丰度相关。大型贫腐殖质或富营养湖泊中的底栖生物群落显示出更高的丰度、分类丰富度以及更多富含PUFA的分类群，而中型和大型腐殖质湖泊（颜色30 - 90毫克铂/升）和富腐殖质湖泊（颜色>90毫克铂/升）中的底栖生物群落则具有丰度降低以及随后PUFA含量低的特征。群落的丰度、分类丰富度和营养质量也与纬度密切相关。pH值较低的湖泊具有较低的底栖无脊椎动物多样性以及体细胞中EPA和DHA含量高的分类群出现频率低的特征。由各种大型植物组合主导的沿岸栖息地的复杂性创造了一个有利于更高底栖丰度以及富含PUFA的分类群增加的环境。底栖无脊椎动物对较高营养级的营养质量可通过外部压力源和通常塑造沿岸底栖生物群落结构的非生物因素之间的复杂相互作用来调节。
在线版本包含可在10.1007/s00027 - 023 - 00996 - 2获取的补充材料。
