Stability of Rocky Intertidal Surfgrass Beds: Persistence, Preempton, and Recovery
Stability of Rocky Intertidal Surfgrass Beds: Persistence, Preempton, and Recovery
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岩石潮间带冲浪草床的稳定性：持久性、抢占性和恢复
DOI：
10.2307/1941308
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发表时间：
1985
期刊：
影响因子：
4.8
通讯作者：
Teresa Turner
中科院分区：
文献类型：
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作者：
Teresa Turner
实验被用来研究潜在的机制，持久性的床的冲浪草Phyllospadix scouleri，一个突出的特点，在岩石的潮间带地区，从不列颠哥伦比亚省到下加利福尼亚的水平台阶。通过以下方法研究了斯氏原甲床的稳定性：（1）量化结构和持久性，（2）实验性地去除斯氏原甲，（3）测量从干扰中恢复的速率。在俄勒冈州的两个研究地点，斯库勒里蛙不仅比任何其他物种占据更多的空间，而且在所有季节都能生存3年。这两个地点之间的差异似乎与它们的干扰模式有关;虽然在任何一个地点都很少产生新的自由空间（每年占面积的0.13%和0.04%），但P. scouleri在它不经常被干扰的地点占据了更多的空间。实验去除P. scouleri（0.25平方米地块）导致藻类覆盖和直立植物多样性显着增加，这表明它抢占其他物种的空间。这些入侵的藻类物种在剩下的研究中占据了实验区的主导地位。在3年的试验中，28个样地中只有9个草坪草幼苗被吸收，并且覆盖度<1%。映射幼苗在28平方米的面积经历了93%的死亡率在7个月。周围的P.scouleri植物的根茎生长到实验地块中的根茎长度的最大增加6厘米/年。缓慢的恢复使得这些社区发生的罕见骚乱也变得重要。因此，尽管它们的恢复缓慢，但P.scouleri床具有高持久性稳定性。他们的这种坚持主要归功于他们的高先发制人的能力。这些特征似乎是许多从食草动物那里逃脱的物种所共有的。
Experiments were used to study the mechanisms underlying the persistence of beds of the surfgrass Phyllospadix scouleri, a prominent feature on horizontal benches in rocky intertidal areas ranging from British Columbia to Baja California. The stability of P. scouleri beds was investigated by: (1) quantifying structure and persistence, (2) experimentally removing P. scouleri, and (3) measuring rates of recovery from disturbance. At two Oregon study sites P. scouleri not only occupied more space than any other species but also persisted through all seasons for 3 yr. Differences between the two sites seem related to their disturbance patterns; although new free space was rarely created at either site (0.13 and 0.04% of the area per year), P. scouleri occupies much more space at the site where it is less often disrupted. Experimental removals of P. scouleri (0.25-m2 plots) resulted in significant increases in algal cover and in upright-plant diversity, suggesting that it preempts space from other species. These invading algal species dominated the experimental plots for the remainder of the study. During the 3-yr ex- periment only nine surfgrass seedlings recruited into 28 plots and occupied <1% cover. Mapped seedlings in a 28-m2 area experienced 93% mortality in 7 mo. Rhizomes of surrounding P. scouleri plants grew into experimental plots at a maximum increase in rhizome length of 6 cm/yr. The slow recovery makes even the rare disturbances that occur in these communities important. Therefore, P. scouleri beds have high persistence stability, despite their slow recovery. They owe this persistence mainly to their high preemptive ability. These characteristics appear common to many species with escapes from herbivores.