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首页> 外文期刊>Restoration ecology >Factors Influencing Seedling Establishment Rates in Zostera marina and Their Implications for Seagrass Restoration
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Factors Influencing Seedling Establishment Rates in Zostera marina and Their Implications for Seagrass Restoration

机译：Zostera marina苗木定植率的影响因素及其对海草恢复的意义

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Selection of strategies to efficiently utilize limited seed supplies in efforts to restore the seagrass Zostera marina (eelgrass) requires a better understanding of the processes that limit seedling establishment at potential restoration sites. We investigated the effect of seed distribution timing on seedling establishment and tested for interactive effects of seed burial and distribution timing. We also investigated the effect of habitat type on seedling establishment by distributing Z. marina seeds inside and outside of established Ruppia maritima (widgeongrass) patches and examined mechanisms causing habitat differences by manipulating seed position (buried or unburied) and vulnerability to seed predators (unprotected or protected in packets). Seeds distributed on the sediment surface in the summer (July or August) produced fewer seedlings than seeds distributed in fall (October) in five of six trials over 3 years.rnSeed burial increased success rates for seeds distributed in summer at one of two sites tested, eliminating the effect of season, but reduced success at the other site. Seeds placed in R. maritima generally produced fewer seedlings than seeds in bare sand, and although seed burial and protection in packets increased success in bare sand at three of four sites, the effect was less consistent in R. maritima. We conclude that seed predation and physical interactions were influential in reducing seedling establishment in R. maritima, contrary to hypotheses positing a nursery role for existing vegetation. Efficient restoration efforts with Z. marina seeds should target unvegetated areas after summertime sources of mortality have diminished. Direct seed burial may enhance seedling establishment rates.
机译：选择有效地利用有限的种子供应量来恢复海草滨海带状海藻（鳗草）的策略，需要对限制在潜在的恢复地点建立苗木的过程有更好的了解。我们调查了种子分配时机对幼苗建立的影响，并测试了种子埋葬和分配时机的相互作用。我们还研究了栖息地类型对幼苗建立的影响，方法是在已建立的小榄（Ruppia maritima）斑块的内部和外部散布Z. marina种子，并研究了通过操纵种子位置（埋藏或未埋藏）和对种子掠食者的脆弱性（未保护）造成生境差异的机制。或以封包形式保护）。在三年内进行的六次试验中，有五次在夏季（七月或八月）分布在沉积物表面的种子产生的幼苗少于秋季（十月）分布的种子。rn埋葬种子可以提高夏天在两个测试地点之一分发的种子的成功率，消除了季节的影响，但降低了在其他站点的成功率。与在裸露的沙土中播种相比，放置在罗马除锈菌中的种子通常产生的幼苗少，尽管在四个地点中的三个地点，埋葬和保护小包中的种子提高了裸露沙土的成功率，但效果不佳。我们得出的结论是，与假说对现有植被起苗圃作用的假设相反，种子捕食和物理相互作用对减少海生红树幼苗的建立有影响。在夏季死亡来源减少之后，用滨海假单胞菌种子进行的有效恢复工作应针对无植被的地区。直接埋葬种子可以提高苗木定植率。

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