Retrospective analysis of dispersive and retentive behaviors of young-of-the-year fishes: Are fish otoliths environmental chronometers

幼鱼分散和滞留行为的回顾性分析:鱼耳石是环境计时器吗

基本信息

项目摘要

Spatial behaviors in marine fishes serve as a principal ecological response to climate change, exploitation patterns, and environmental degradation. Yet there exist few quantitative and conceptual tools to develop hypotheses related to intra?population variations in migration and habitat use patterns. Contingent structure (intra?population modalities in dispersive and retentive behaviors) has been proposed as a useful means to measure and categorize variation in spatial behaviors, and to evaluate the consequences of variation at the population and metapopulation level. Contingent structure has been demonstrated in diverse estuarine and coastal fishes using strontium, multi?element, and isotopic tracers in fish otoliths. This research project will test several factors that lead to contingent structure and evaluate population?level consequences of contingent structure for estuarine?dependent populations of white perch, Morone americana, within the Chesapeake Bay. Past research supported by NSF uncovered the existence of two discrete juvenile contingents classified as retentive (freshwater) or dispersive (brackish water) individuals. Further, in a large sample of adults, juvenile contingent behaviors were observed to structure growth and recruitment rates at the population level. Contingent structuring in Chesapeake Bay white perch represents a unique opportunity to evaluate important hypotheses that relate contingent structure (spatial behaviors) to growth, recruitment, abundance, life history, and environmental circumstance. Hypothesized mechanisms for the maintenance of contingent structure draw heavily upon literature for resident and migratory salmon ecomorphs, which emphasizes early growth rate and metabolic differences between retentive and dispersive contingents. For this research project, intensive ichthyplankton field studies and larval cohort analyses will be conducted to link larval growth, mortality and environmental conditions to subsequent juvenile contingent structure. Juvenile contingents will be sampled in the field and in the laboratory, bioenergetic studies will be conducted to test whether dispersive juveniles allocate proportionately more energy toward feeding and less toward routine metabolism. For a large sample of adults collected from seven major Chesapeake Bay sub?estuaries, juvenile dispersive behaviors will be reconstructed, and contingent structuring investigated as a mechanism shaping recruitment and resiliency within populations, and possibly connectivity among sub?populations. Climate effects on contingent structuring will also be investigated. Otolith isotope tracers, which are expected to be more reliable tracers of nursery habitats than strontium in otoliths, will be further developed. Protection of Essential Fish Habitat (EFH) is now mandated in the management of marine fishes, yet concepts of EFH remain poorly defined and many of the approaches to rank habitats lack rigor or are untenable. Other researchers have proposed systems that rank nursery habitat according to how many juveniles from a set of nursery habitats recruit to the adult stock. Past NSF?supported research on the contribution of white perch juvenile contingents to the adult stock represents an initial effort to evaluate nursery habitats in this manner. Ranking systems deserve additional evaluation because 1) the concept is testable with tools developed in past NSF research and elsewhere, but 2) the concept may need to be broadened. In temperate systems, the consequences of juvenile habitat use may largely depend upon climate. For instance, preliminary results for Chesapeake Bay white perch indicate that in high flow years, brackish water habitats contributed a majority of adult recruits and thereby are most important for white perch recruitment and population growth. Still, during low flow years, freshwater nursery habitats made disproportionately important contributions to the adult stock and thereby may confer resiliency to the population during decadal cycles of drought. A broader impact of this research is the comprehensive evaluation of the EFH concept through simultaneous analysis of many populations across relevant climatic cycles.
海洋鱼类的空间行为是对气候变化、开发模式和环境退化的主要生态响应。然而,存在一些定量和概念性的工具来开发与内部?人口迁移和生境使用模式的差异。应急结构(内部?分散和保持行为的种群形态)已被提出作为一种有用的手段来测量和分类空间行为的变化,并评估在种群和集合种群水平上的变化的后果。 权变结构已被证明在不同的河口和沿海鱼类使用锶,多?元素和同位素示踪剂。 这个研究项目将测试几个因素,导致权变结构和评估人口?河口偶然结构的水平后果?切萨皮克湾内的白色鲈鱼Morone americana的依赖种群。 NSF支持的过去的研究发现存在两个独立的青少年特遣队,分为保留(淡水)或分散(咸水)个体。 此外,在一个大样本的成年人,青少年的偶然行为被观察到结构的增长和招聘率在人口水平。在切萨皮克湾白色鲈鱼的权变结构是一个独特的机会,以评估重要的假设,关系到权变结构(空间行为)的增长,招聘,丰富,生活史和环境情况。 假设的机制,为维护特遣队的结构借鉴大量的文献,居民和迁徙鲑鱼的生态形态,强调早期的增长速度和代谢之间的差异保留和分散特遣队。 在这项研究项目中,将进行密集的鱼类浮游生物实地研究和幼虫群体分析,以将幼虫的生长、死亡率和环境条件与随后的幼鱼组成结构联系起来。 将在野外和实验室对少年特遣队进行取样,进行生物能量研究,以测试分散的少年是否将更多的能量分配给进食,而较少的能量分配给日常代谢。 从七个主要的切萨皮克湾潜艇上采集的大量成年样本?河口,青少年分散的行为将重建,和特遣队的结构调查作为一种机制,塑造人口内的招聘和弹性,并可能子之间的连接?人口。 还将研究气候对应急结构的影响。耳石同位素示踪剂有望成为比耳石中锶更可靠的苗圃生境示踪剂,将得到进一步的发展。 保护基本鱼类栖息地(EFH)现在是海洋鱼类管理的强制性要求,但EFH的概念仍然定义不清,许多栖息地排名的方法缺乏严谨性或站不住脚。 其他研究人员提出了一种系统,根据一组苗圃栖息地中有多少幼鱼被招募到成年种群中来对苗圃栖息地进行排名。 通过NSF?对白色鲈鱼幼鱼对成鱼的贡献的研究是以这种方式评估苗圃生境的初步努力。 排名系统值得进一步评估,因为1)这个概念可以用过去NSF研究和其他地方开发的工具进行测试,但2)这个概念可能需要扩展。 在温带系统中,少年栖息地使用的后果可能在很大程度上取决于气候。例如,切萨皮克湾白色鲈鱼的初步结果表明,在高流量年,咸水栖息地贡献了大部分的成年新兵,从而是最重要的白色鲈鱼招聘和人口增长。 尽管如此,在低流量的年份,淡水苗圃栖息地作出了不成比例的重要贡献的成年股票,从而可能赋予弹性的人口在十年周期的干旱。这项研究的一个更广泛的影响是通过对相关气候周期中的许多人群进行同时分析,对EFH概念进行全面评估。

项目成果

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David Secor其他文献

Examining the periodicity of annular deposition of otolith microconstituents as a means of age validation
检查耳石微成分环形沉积的周期性作为年龄验证的手段
  • DOI:
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    0.8
  • 作者:
    Benjamin Frey;Vyacheslav Lyubchich;Michelle Zapp Sluis;Nathaniel Miller;David Secor
  • 通讯作者:
    David Secor

David Secor的其他文献

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{{ truncateString('David Secor', 18)}}的其他基金

Increasing Seawater Filtration Capabilities to Enhance Coastal Mesocosm-scale Research
提高海水过滤能力以加强沿海中生态尺度研究
  • 批准号:
    0934254
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Increasing Controlled Environmental Chamber Capabilities to Enhance Research Using Seawater System Facilities
提高受控环境室能力以加强利用海水系统设施的研究
  • 批准号:
    0533412
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Retrospective Analysis of Dispersive and Retentive Behaviors of Young-of-the-Year Estuarine Fishes: Are Fish Otoliths Environmental Chronometers?
河口幼鱼分散和滞留行为的回顾性分析:鱼耳石是环境计时器吗?
  • 批准号:
    9812069
  • 财政年份:
    1998
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
U.S.-Japan Cooperative Science: Ecophysiology of Larval-Stage Dispersal in Estuarine Fishes
美日合作科学:河口鱼类幼虫期扩散的生态生理学
  • 批准号:
    9725942
  • 财政年份:
    1998
  • 资助金额:
    --
  • 项目类别:
    Standard Grant

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