Dekanová Vladimíra, Svitok Marek, Bento Sara, Caramelo João, Peixe E Sousa Pedro, Carreira Bruno M
cE3c - Centre for Ecology, Evolution and Environmental Changes & CHANGE - Global Change and Sustainability Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal.
Department of Biology and General Ecology, Faculty of Ecology and Environmental Sciences, Technical University in Zvolen, Zvolen, Slovakia.
PeerJ. 2024 Dec 16;12:e18576. doi: 10.7717/peerj.18576. eCollection 2024.
The lack of reliable data on length-mass relationships, essential to obtain accurate biomass estimates, limits our ability to easily assess secondary production by aquatic invertebrates. In the absence of published equations from similar habitat conditions, authors often borrow equations developed in geographic regions with different climate conditions, which may bias biomass estimates. A literature overview of published size-mass relationships for Portugal and Sweden highlights the need for further data within these biogeographic regions. We increased the number of equations available to Southern and Northern Europe, developing 18 new length-mass relationships for two families and 10 genera in Portugal and Sweden. All equations were published for the first time for these countries, except the genus . Our length-mass relationships were obtained from specimens collected on a one-time sampling of eight ponds in Portugal and five ponds in Sweden during late spring in 2023. Dry mass (DM) was modelled as a function of body length (BL), using the natural log-linear function with a power model (ln DM = ln + × ln BL). The equations obtained were compared with linear mixed models testing the fixed effects of "body length" and "country", as well as their interaction. A comparison of the equations developed in this study showed country-specific differences for all taxa, expect the genus , indicating a low potential transferability of the equations between Southern and Northern Europe. In contrast, the comparison of the equation obtained for in this study with an equation published for this taxon in Sweden showed great similarities, suggesting a high transferability. Recommending caution in the borrowing of published length-mass equations, that can differ drastically between different geographic and climatic regions, especially at larger sizes, we provide a series of guidelines and good practices in this field.
缺乏长度-质量关系的可靠数据（这对于获得准确的生物量估计至关重要）限制了我们轻松评估水生无脊椎动物次级生产力的能力。在没有来自类似栖息地条件的已发表方程的情况下，作者通常借用在不同气候条件的地理区域开发的方程，这可能会使生物量估计产生偏差。对葡萄牙和瑞典已发表的大小-质量关系的文献综述强调了在这些生物地理区域内需要更多数据。我们增加了可供北欧和南欧使用的方程数量，为葡萄牙和瑞典的两个科和10个属建立了18个新的长度-质量关系。除了 属外，所有方程都是首次在这些国家发表。我们的长度-质量关系是从2023年春末在葡萄牙的8个池塘和瑞典的5个池塘一次性采样收集的标本中获得的。干质量（DM）被建模为体长（BL）的函数，使用带有幂模型的自然对数线性函数（ln DM = ln + × ln BL）。将获得的方程与检验“体长”和“国家”的固定效应及其相互作用的线性混合模型进行比较。本研究中开发的方程的比较显示，除了 属外，所有分类单元都存在国家特异性差异，这表明这些方程在北欧和南欧之间的可转移性较低。相比之下，本研究中为 属获得的方程与瑞典为该分类单元发表的方程的比较显示出很大的相似性，表明可转移性较高。鉴于不同地理和气候区域之间已发表的长度-质量方程可能存在巨大差异，尤其是在较大尺寸时，我们建议谨慎借用这些方程，并在此领域提供了一系列指导方针和良好做法。
