• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Habitat preferences and the effects of seagrass density on population demographics and feeding ecology of pipefish in the Indian River Lagoon, FL.
【24h】

Habitat preferences and the effects of seagrass density on population demographics and feeding ecology of pipefish in the Indian River Lagoon, FL.

机译：佛罗里达印第安河泻湖的生境偏好和海草密度对河豚的种群统计和饲喂生态的影响。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Seagrass density in the Indian River Lagoon (IRL), Florida, has declined over the past 20 years, especially in the central lagoon. Loss or degradation of seagrass may negatively impact seahorses and pipefish (family Syngnathidae) that have strong associations with these habitats. Results from mesocosm studies showed that juvenile Syngnathus louisianae preferred the seagrass, Halodule wrightii, in 60 +/- 6% of the observations relative to two macroalgae species, Gracilaria sp. and Caulerpa prolifera, or the water column or sand. Male and female S. scovelli had a more varied pattern for habitat preference in that 33 +/- 4% of the observations for females occurred in H. wrightii followed by 25 +/- 4% in sand. Male S. scovelli had essentially the same habitat preferences as females; however, the males showed a diurnal migration from the sand during the day to vegetative habitats at night. In the presence of a perceived predator in the mesocosm, male S. scovelli did not prefer any particular habitat, suggesting that in the presence of a predator any habitat will do. Results from additional mesocosm studies showed that S. louisianae had a preference for 100% H. wrightii in 56 +/- 9% of the observations relative to lower seagrass densities of 50% and 25%. Such strong preference for a seagrass density of 100% suggests this species may be adversely impacted by the decline in seagrass density in the IRL. Female and male S. scovelli had equal preferences for sand and 100% and 50% density seagrass; however, they did not prefer 25% density seagrass. Therefore, S. scovelli may be less impacted by decreases in seagrass density. Results from field studies in the IRL showed that S. scovelli collected from 50% density seagrass beds were significantly smaller than pipefish in the 100% density seagrass. Despite a direct relationship between size and seagrass density, no differences in fecundity were found between seagrass densities. Additional field studies showed a change from a benthic to pelagic diet for mid-sized pipefish. Pipefish from 5-7.9 cm consumed a larger volume of harpacticoids in 100% seagrass when compared with the same fish size class in 50% density seagrass. Furthermore, pipefish in the 50% seagrass density consumed calanoid copepods, not harpacticoids. Although S. scovelli demonstrated a preference for 50% density seagrass in laboratory mesocosms, field observations of population demographics and feeding ecology suggest that 50% density seagrass may not be an ideal habitat for this species.
机译：在过去的20年中，佛罗里达州印度河泻湖（IRL）的海草密度下降了，特别是在泻湖中部。海草的丧失或退化可能会对与这些栖息地有密切联系的海马和pipe鱼（Syngnathidae家族）产生负面影响。中观研究的结果表明，相对于两个大型藻类（Gracilaria sp。），在60 +/- 6％的观测结果中，幼龄的Syngnathus louisianae首选海草Whalodule wrightii。和Caulerpa prolifera或水柱或沙子。雄性和雌性S. scovelli的栖息地偏好模式差异更大，雌性观察者中33％+/- 4％发生在Wrightii中，其次是沙中25 +/- 4％。雄性S. scovelli具有与雌性基本相同的栖息地偏好。但是，雄性白天从沙地到夜间到植物生长地都有昼夜迁移。在中观中存在感知到的捕食者时，雄性S. scovelli不喜欢任何特定的栖息地，这表明在存在捕食者的情况下任何栖息地都可以。来自其他中观宇宙研究的结果表明，相对于50％和25％的较低海草密度，在56 +/- 9％的观测结果中，路易斯安那州葡萄菌更倾向于100％的W. wrightii。对海草密度为100％的强烈偏好表明，该物种可能受到IRL中海草密度下降的不利影响。雌雄S. scovelli对沙和密度分别为100％和50％的海草具有相同的偏好；但是，他们不喜欢25％密度的海草。因此，S。scovelli受海草密度降低的影响较小。 IRL的实地研究结果表明，从密度为50％的海草床上收集的S. scovelli明显小于密度为100％的海草中的pipe鱼。尽管大小与海草密度之间存在直接关系，但在海草密度之间未发现繁殖力差异。额外的田间研究表明，中型pipe鱼的饮食结构从底栖变为上层。与相同大小的鱼类在50％密度的海草中相比，在5-7.9厘米处的白头鱼在100％的海草中消耗了更多的类类拟螺物。此外，海草密度为50％的pipe鱼消耗了类an足类，而不是类拟螺足类。尽管S. scovelli在实验室中的中观中显示了对密度为50％的海草的偏爱，但对人口统计学和摄食生态学的野外观察表明，密度为50％的海草可能不是该物种的理想栖息地。

著录项

  • 作者

    Krejci, Sarah Ellen.;

  • 作者单位

    Florida Institute of Technology.;

  • 授予单位 Florida Institute of Technology.;
  • 学科 Biology Ecology.;Biology Oceanography.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 169 p.
  • 总页数 169
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

  • 入库时间 2022-08-17 11:43:31

相似文献

  • 外文文献
  • 中文文献
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