首页> 外文学位 >Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age.
【24h】

Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age.

机译:日历时间,温度和生长日数对太平洋鲱鱼(Clupea pallasii)年龄的影响。

获取原文
获取原文并翻译 | 示例

摘要

Forage fish species are essential to global marine ecosystems as conduits of energy transfer from low to high trophic levels. Pacific herring (Clupea pallasii) are an important forage fish species in northeast Pacific marine and estuarine ecosystems. Pacific herring length-at-age (LaA, mm) has declined markedly over the past several decades in California and British Columbia (BC) regions thereby influencing physiological processes and biological interactions. Assessing variability in herring LaA is relevant to population and ecosystem studies in addition to sustainable fisheries management and informing fisheries policy. In this study, herring LaA for north coast BC, south coast BC and California (San Francisco Bay) populations were used to estimate how much of the variation is explained by time (year, calendar time), sea surface temperature (°C), and growing degree-day (a metric combining sea surface temperature and calendar time, GDD, °C˙day). Time (year) explains more of the interannual variability in herring LaA compared to sea surface temperature and the GDD metric. In addition, a complete removal of older age classes was evident for all areas, suggesting that factors other than those assessed in this study have influenced herring LaA.;The results of this research suggest that future studies should focus on modeling multiple factors that may influence variability in herring LaA such as ocean regime shifts influencing prey quality and quantity, environmental pressures (e.g., seawater temperature), and impacts from size-selective fishing that may affect population recovery of this species.
机译:饲用鱼类对全球海洋生态系统至关重要,因为它们是从低营养级到高营养级的能量传递渠道。太平洋鲱鱼(Clupea pallasii)是东北太平洋海洋和河口生态系统中重要的觅食鱼类。在过去的几十年中,加利福尼亚和不列颠哥伦比亚(BC)地区的太平洋鲱鱼的成年年龄(LaA,mm)显着下降,从而影响了生理过程和生物相互作用。评估鲱鱼LaA的变异性与人口和生态系统研究有关,此外还涉及可持续渔业管理和告知渔业政策。在这项研究中,使用了卑诗省北海岸,卑诗省南海岸和加利福尼亚州(旧金山湾)人口的鲱鱼产区,估计了时间(年,日历时间),海面温度(°C),和生长度-天(结合海表温度和日历时间,GDD,℃和天的度量)。时间(年)解释了与海面温度和GDD度量相比,鲱鱼LaA的年际变化。此外,在所有地区明显都消除了较老的年龄段,这表明除本研究评估的因素以外,其他因素也影响了鲱鱼的LaA。本研究的结果表明,未来的研究应着重于对可能影响人类健康的多种因素进行建模鲱鱼LaA的变异性,例如影响捕食者的数量和质量,环境压力(例如海水温度)的海洋政权转移以及可能影响该物种种群恢复的规模选择性捕鱼的影响。

著录项

  • 作者

    Grebeldinger, Erika M.;

  • 作者单位

    Royal Roads University (Canada).;

  • 授予单位 Royal Roads University (Canada).;
  • 学科 Aquatic sciences.;Ecology.;Management.
  • 学位 M.S.
  • 年度 2016
  • 页码 70 p.
  • 总页数 70
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号