BENTHIC DETERMINANTS OF SETTLEMENT FOR PLANKTONIC LARVAE - AVAILABILITY OF SETTLEMENT SITES FOR THE TUBE-BUILDING POLYCHAETE SPIRORBIS-SPIRILLUM (LINNAEUS) SETTLING ONTO SEAGRASS BLADES
BENTHIC DETERMINANTS OF SETTLEMENT FOR PLANKTONIC LARVAE - AVAILABILITY OF SETTLEMENT SITES FOR THE TUBE-BUILDING POLYCHAETE SPIRORBIS-SPIRILLUM (LINNAEUS) SETTLING ONTO SEAGRASS BLADES
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DOI：
10.1016/0022-0981(90)90084-p
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发表时间：
1990-01-01
影响因子：
2
通讯作者：
DIRNBERGER, JM
中科院分区：
文献类型：
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作者：
DIRNBERGER, JM
在墨西哥湾的西北部，一种无柄的管状多毛类动物螺旋藻（Spirorbis）的浮游幼虫，不成比例地定居在海草海苔（Thalassia testudinum Banks et Konig）的生长叶片的基部。实验搬迁叶片和去除附生生物表明，搜索幼虫避免附生藻类与叶片的远端区域。无附生植物的空间容易被S.因为幼虫也倾向于在水柱更深的地方定居，那里的空间是由植物生长产生的。观测沉降速率和S.使用来自同种和藻类（> 0.7mm）的藻类沉降物来计算沉降幼虫“所需”的自由空间。随着时间的推移，解决幼虫所需的空间很少超过自由空间生长海草叶片（只有2 37日期检查）。增加自由空间（通过增加叶片清除附生植物）内的外壳没有增加的S。实验区内的沉降表明沉降空间的可用性很高。幼虫似乎有效地搜索叶片生长迅速产生的空间。因此，底栖生物种群的大小容易受到浮游生物幼虫到达的速度变化的影响，而不是受到定居空间开放的局部变化的影响。如果，在其他系统中的幼虫能够搜索显着大的区域，在这项研究中发现，那么在空间可用性的变化，以解决变化的贡献，必须仔细考虑。
In northwestern Gulf of Mexical bays planktonic larvae of Spirorbis spirillum (Linnaeus), a sessile tube-buiding polychaete, settle disproportionately on the bases of growing blades of the seagrass Thalassia testudinum Banks et Konig. Experimental relocation of blades and removal of epiphytic organisms demonstrated that searching larvae avoid epiphytic algae associated with distal regions of blades. Epiphyte-free space is readily accessible to S. spirillum larvae because larvae also tend to settle deeper in the water column where space is produced by plant growth. Observed settlement rates and the distance that S. spirillum settles from conspecifics and algae (> 0.7 mm) were used to calculate free space "required" by settling larvae. Space required by settling larvae over time very rarely exceeded free space produced by growing seagrass blades (only 2 of 37 dates examined). Increased free space (through additions of blades cleared of epiphytes) within enclosures did not increase numbers of S. spirillum settling within experimental areas indicating high space availability for settlement. Larvae appear to search efficiently for space produced rapidly by blade growth. As a result, the benthic population size is susceptible to changes in the rate at which larvae arrive from the plankton, rather than to local changes in the opening of space for settlement. If, in other systems larvae are capable of searching significantly large areas, as found in this study, then the contribution of changes in space availability to settlement variability must be carefully considered.