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首页> 外文学位 >Factors influencing recruitment of the dictyotalean brown alga Zonaria farlowii and other sessile marine organisms at Santa Catalina Island, California.
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Factors influencing recruitment of the dictyotalean brown alga Zonaria farlowii and other sessile marine organisms at Santa Catalina Island, California.

机译：影响在加利福尼亚州圣卡塔琳娜岛上捕食独联藻棕色藻类Zonaria farlowii和其他无柄海洋生物的因素。

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摘要

I investigated aspects of the natural history of the common dictyotalean brown alga Zonaria farlowii Setchell & Gardner 1924 across several temperate, rocky reefs surrounding Santa Catalina Island, California USA. Depth strongly affected every Zonaria measure. Zonaria biomass, coverage, and reproductive output were maximal at shallow depths. Laboratory experiments confirmed maximum growth under high light conditions corresponding to shallow depths. Nutrients and sessile grazers were not correlated with adult Zonaria variation across depths. Recruitment was highly variable in space and time, but was positively correlated with depth. Recruitment peaked at the deepest depth and was negatively related to adult abundance and reproductive output. This appears to be the first documented example of this phenomenon. In a large light manipulation experiment, Zonaria and overall dictyotalean recruits were common only under low light conditions, suggesting grazing alone cannot adequately explain variation across Catalina reefs. At least 1billion Zonaria propagules settle upon the 47 kilometer eastern coastline of Santa Catalina Island each year, with more than half of those surviving 6 months or less deeper than 15 m.; Zonaria is more abundant upon the rugose shells of the large mollusk Lithopoma undosa than upon surrounding rocky reef substrates at Catalina. A yearlong, multi-factorial recruitment experiment utilizing models of Lithopoma shells and flat, concrete tiles as recruitment substrates to test the hypothesis that substrate rugosity, grazing, and irradiance interact to influence the recruitment of Zonaria and other organisms. Shading did not significantly affect subsequent recruits, but rugosity and grazing interacted to influence recruitment. Algal density, cover, and morphology never differed significantly between experimental surfaces when large grazers were excluded; significant and consistent trends emerged only when surfaces were exposed to all ambient grazers. Rugosity and grazing independently affected algal and invertebrate community diversity. Subsequent surveys across Catalina reefs showed Zonaria abundance and algal diversity were significantly correlated with substrate rugosity only when grazers were abundant. Such meso-scale rugosity appears to strongly influence algal abundance and biodiversity in aquatic habitats, with the nature and magnitude of this effect dependent upon algal natural history and grazer abundance. This substratum-attachment hypothesis is consistent with observed recruitment patterns from a wide variety of communities across the globe.
机译：我调查了美国加利福尼亚州圣卡塔琳娜岛周围数个温带岩石礁石上常见的单藻棕色藻类（Sitalell＆Gardner，1924年）的自然历史方面。深度强烈影响每个度量。浅层深度的 Zonaria 生物量最大。实验室实验证实，在强光条件下（对应浅深度）的最大生长。营养物和无柄放牧者与成人不同深度的<斜纹体> Zonaria 变化无关。招聘的时空变化很大，但与深度呈正相关。招聘人数在最深处达到顶峰，与成年人的丰度和生殖产出负相关。这似乎是该现象的第一个记录的示例。在一个大型的光操纵实验中， Zonaria 和全部独生子新兵只有在弱光条件下才是常见的，这表明仅放牧就不足以解释卡塔利娜礁石之间的差异。每年在圣卡塔利娜岛47公里的东部海岸线上定居的繁殖体至少有10亿只，其中有一半以上在6个月或更短的时间内幸存下来，深度不超过15 m。在大型软体动物 undososa 的皱纹壳上， Zonaria 比卡塔利娜岛周围的礁石底物丰富。一项为期一年的多因素招募实验，使用 Lithopoma 壳模型和平坦的混凝土砖作为招募基质，测试了假设的假设：基质的皱纹度，掠食性和辐照度相互作用会影响 Zonaria的募集和其他生物。阴影不会显着影响随后的新兵，但皱纹和放牧相互作用会影响新兵。当排除大型放牧者时，实验表面之间的藻类密度，覆盖率和形态没有显着差异。仅当表面暴露于所有周围的放牧者中时，才会出现显着且一致的趋势。粗鲁和放牧独立地影响了藻类和无脊椎动物的群落多样性。随后对卡塔利娜珊瑚礁的调查显示，只有当放牧者充足时， Zonaria 的丰度和藻类多样性才与基质的皱纹密切相关。这种中尺度的皱纹似乎强烈影响水生生境中的藻类丰度和生物多样性，其影响的性质和大小取决于藻类的自然历史和放牧者的丰度。这种底层附着的假设与全球范围内各种社区观察到的募集模式一致。

著录项

  • 作者

    Anderson, Sean Sumner.;

  • 作者单位

    University of California, Los Angeles.;

  • 授予单位 University of California, Los Angeles.;
  • 学科 Biology Ecology.; Biology Oceanography.; Biology Botany.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 224 p.
  • 总页数 224
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;海洋生物;植物学;
  • 关键词

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