...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Movements of Ilyanassa obsolete (Gastropoda) on an intertidal sandflat
【24h】

Movements of Ilyanassa obsolete (Gastropoda) on an intertidal sandflat

机译：潮间带沙地上的Ilyanassa（Gastropoda）过时的运动

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

The gastropod llyanassa obsoleta (Say) is native to the east coast of North America where it is locally abundant on sandflats, mudflats, and in saltmarsh creeks. The local disturbances created by snails and their movements affect soft-sediment community composition. Movements of individually marked snails were followed on an intertidal sandflat on Cape Henlopen, Delaware, U.S.A. In June 1991, 1,200 snails that had tested as trematode-uninfected were released and over 5 months 554 were sighted 971 times. Mean daily net distance moved was 1.7 m, but snails often moved 10-20 m day~(-1) and one snail was 180 m distant after 130 days. Net dispersal of the released population was attained in ≈ 10 days, by which time, a typical distance from release was 15—20 m. Snails were not found crossing sandbars and most moved away from shore into a tidal gully. In June 1993, 500 snails, both uninfected and trematode-infected, were released at the same position and over 6 months, 350 snails were sighted 949 times. Sandbars were again barriers to movement, but their changed positions allowed wider dispersal. Net dispersal was complete in ≈ 20 days by which time a typical distance from release was 30-40 m. Mean daily net distance moved was 2.2 m, but within 10 days snails had moved 50-100 m. In both years, following initial dispersal, snails (infected or not) took up random directions from move to move. Infected and uninfected snails dispersed equal distances, but had different mean final dispersal directions. Dispersal of I. obsoleta individuals was extensive and affected by shifting sandbar positions and parasitism. Recognizing this will be important in appreciating the ecological dynamics of this gastropod and in determining its effects on soft-bottom communities.
机译：腹足纲llyanassa obsoleta（Say）原产于北美东海岸，在沙扁，泥滩和盐沼小溪中本地丰富。蜗牛及其运动造成的局部干扰会影响软沉积物的组成。 1991年6月，在美国特拉华州Henlopen角的潮间带沙丘上追踪有单独标记的蜗牛的运动.1991年6月，释放了1200只经测试未受吸虫感染的蜗牛，并在5个月内观察到971次蜗牛。每天的平均净移动距离为1.7 m，但蜗牛经常在10天后移动10-20 m〜（-1），而一只蜗牛在130天后的距离为180 m。释放种群的净扩散在约10天之内完成，到那时，到释放的典型距离为15-20 m。没有发现蜗牛穿过沙洲，而且大多数蜗牛都从岸上移到了一条潮沟中。 1993年6月，在同一位置放出500只未感染和吸虫感染的蜗牛，并在6个月内发现949次，发现了350只蜗牛。沙洲再次成为行动的障碍，但它们的位置改变允许更广泛的散布。约20天之内完成了净扩散，此时距离释放的典型距离为30-40 m。平均每天移动的净距离为2.2 m，但是在10天之内蜗牛移动了50-100 m。在这两年中，在最初传播之后，蜗牛（已感染或未感染）在移动过程中随机出现方向。感染和未感染的蜗牛散布的距离相等，但平均最终散布方向不同。 I.过时个体的散布是广泛的，并且受到沙洲位置的变化和寄生虫的影响。认识到这一点对于了解这种腹足动物的生态动力学以及确定其对软体动物群落的影响至关重要。

著录项

  • 来源
    《Marine biology》 |2005年第2期|p.307-317|共11页
  • 作者

    Lawrence A. Curtis;

  • 作者单位

    Department of Biological Sciences and Graduate College of Marine Studies, University of Delaware, Newark, DE 19716, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
  • 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