新鲜标本与保存标本:亚马逊河西部(厄瓜多尔纳波盆地)鱼类的长度-重量关系

IF 0.7 4区 农林科学 Q4 FISHERIES
Karla S. Barragán, Junior Chuctaya, Daniel Escobar-Camacho, José Vieira, Andrea C. Encalada
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引用次数: 0

摘要

长度重量关系(LWR)研究对于鱼类分类分析、生态评估、管理和保护措施都很重要。虽然长度重量关系研究可以使用新鲜或保存标本进行测量,但很少有研究对这两种方法进行直接比较。本研究分析了保存对厄瓜多尔东部库拉雷河流域(纳波河流域)十种小型淡水鱼类的长宽比的影响。对 255 个野生标本进行了测量、称重、福尔马林固定和 70% 乙醇保存。同一物种批次的 287 个标本在保存后再次进行了测量。我们用线性回归法估算了 LWR 曲线,并比较了新鲜标本和保存标本的斜率和截距。在保存过程中,所有十个物种的重量都发生了显著变化,两个物种的重量和长度都发生了变化。变化的程度因每个物种的形态和最大尺寸而异。较小个体的重量损失比例更大。对其中 8 个物种的 LWR 估计是科学界的新发现。这些结果提供了长程重量研究中保存效果的新证据,并对文献中报道的不同结果进行了汇总。我们得出的结论是,应鼓励对新鲜标本进行测量,以进行 LWR 研究。不过,我们也认识到这并不总是可行的,因此使用保存的标本进行研究时应考虑保存对体长和体重的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fresh vs. Preserved Specimens: Length-Weight Relationships of Fishes from the Western Amazon (Napo Basin, Ecuador)

Fresh vs. Preserved Specimens: Length-Weight Relationships of Fishes from the Western Amazon (Napo Basin, Ecuador)

Length-weight relationship (LWR) studies are important for fish taxonomical analysis, ecological assessments, management, and conservation practices. Although LWR studies can use measurements of either fresh or preserved specimens, few studies have directly compared these methods. This study analyzed the effect of preservation on LWR of ten small-sized freshwater fish species from the Curaray River basin (Napo Basin), eastern Ecuador. 255 wild specimens were measured, weighed, fixed in formalin, and finally preserved in 70% ethanol. 287 specimens from the same species batch were measured again after preservation. We estimated LWR curves with linear regressions and compared slopes and intercepts between fresh and preserved specimens. The preservation process altered weight significantly for all ten species and altered both weight and length for two species. The magnitude of change varied according to the morphology and maximum size of each species. Smaller individuals exhibited greater proportional weight losses. LWR estimates for eight of the species are new to science. These results present new evidence of the preservation effects in LWR studies as well as a compilation of the varying results reported in the literature. We conclude that measurements on fresh specimens should be encouraged for LWR studies. However, recognizing that this is not always feasible, studies using preserved specimens should consider the effects of preservation on body length and weight.

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来源期刊
Journal of Applied Ichthyology
Journal of Applied Ichthyology 生物-海洋与淡水生物学
CiteScore
2.30
自引率
11.10%
发文量
73
审稿时长
3-8 weeks
期刊介绍: The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.
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