Life-history variation among four lake trout (Salvelinus namaycush) morphs at six locations in Lake Superior

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research Pub Date : 2024-05-22 DOI:10.1016/j.jglr.2024.102371

{"title":"Life-history variation among four lake trout (Salvelinus namaycush) morphs at six locations in Lake Superior","authors":"","doi":"10.1016/j.jglr.2024.102371","DOIUrl":null,"url":null,"abstract":"<div><p>Life-history variation among four lake trout <em>Salvelinus namaycush</em> morphs was quantified at six geographically distant locations in Lake Superior (∼30 to 250 km apart), one of the largest freshwater lakes in the world (82,100 km<sup>2</sup>). Lake trout were sampled using standardized multi-mesh gillnets in three depth strata at six locations in Lake Superior that were known or thought to have multiple morphs. Life-history traits were estimated using length-age analysis of back-calculated growth from sagittal otolith increments. Morphs, assigned using statistical and visual assignment rules, included 122 humpers, 646 leans, 86 redfins, and 1154 siscowets. Density (CPUE) varied 11-fold among morphs, 7-fold among locations, and 3-fold among depths. Morphs seemed to fill the same ecological niche at all locations, because life-history traits related to weight (body condition, buoyancy, mean weight), age, and growth rate varied more among morphs than locations. However, abiotic and biotic variation among locations also seemed to exert control over life-history variation, because life-history traits related to length, maturity, and early life history varied more among locations than morphs. We conclude that lake trout morphs appeared to have a genetic component to their life history that was differentially expressed along environmental gradients.</p></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"50 4","pages":"Article 102371"},"PeriodicalIF":2.4000,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0380133024001217/pdfft?md5=bc8634844bdf2e85fdd6d5bb5eb0f694&pid=1-s2.0-S0380133024001217-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Great Lakes Research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0380133024001217","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Life-history variation among four lake trout Salvelinus namaycush morphs was quantified at six geographically distant locations in Lake Superior (∼30 to 250 km apart), one of the largest freshwater lakes in the world (82,100 km²). Lake trout were sampled using standardized multi-mesh gillnets in three depth strata at six locations in Lake Superior that were known or thought to have multiple morphs. Life-history traits were estimated using length-age analysis of back-calculated growth from sagittal otolith increments. Morphs, assigned using statistical and visual assignment rules, included 122 humpers, 646 leans, 86 redfins, and 1154 siscowets. Density (CPUE) varied 11-fold among morphs, 7-fold among locations, and 3-fold among depths. Morphs seemed to fill the same ecological niche at all locations, because life-history traits related to weight (body condition, buoyancy, mean weight), age, and growth rate varied more among morphs than locations. However, abiotic and biotic variation among locations also seemed to exert control over life-history variation, because life-history traits related to length, maturity, and early life history varied more among locations than morphs. We conclude that lake trout morphs appeared to have a genetic component to their life history that was differentially expressed along environmental gradients.

查看原文本刊更多论文

苏必利尔湖六个地点四种湖鳟（Salvelinus namaycush）形态的生活史变异

在苏必利尔湖（世界上最大的淡水湖之一，面积为 82,100 平方公里）的六个地理距离较远的地点（相距 30 至 250 公里），对四种湖鳟 Salvelinus namaycush 形态之间的生活史变异进行了量化。在苏必利尔湖已知或被认为有多种形态的六个地点，用标准多目刺网在三个深度层对湖鳟进行采样。通过对矢状耳石增量的反向计算生长进行长度-年龄分析，估计了湖鳟的生活史特征。使用统计和目测分配规则分配的形态包括 122 条驼背鱼、646 条斜颌鱼、86 条红鳍鱼和 1154 条虹鳟。不同形态的密度（CPUE）相差 11 倍，不同地点相差 7 倍，不同深度相差 3 倍。由于与体重（身体状况、浮力、平均体重）、年龄和生长速度有关的生命史特征在不同形态之间的差异比在不同地点之间的差异更大，因此各形态似乎在所有地点都占据相同的生态位。然而，不同地点之间的非生物和生物变化似乎也控制着生命史的变化，因为与体长、成熟度和早期生活史有关的生命史特征在不同地点之间的差异比在不同形态之间的差异更大。我们的结论是，湖鳟形态的生活史似乎具有遗传因素，这种遗传因素会随着环境梯度的变化而表现出不同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Great Lakes Research 生物-海洋与淡水生物学

CiteScore

5.10

自引率

13.60%

发文量

178

审稿时长

6 months

期刊介绍： Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.