Reproduction and early life history of an invasive ascidian Styela clava Herdman in Prince Edward Island, Canada
Reproduction and early life history of an invasive ascidian Styela clava Herdman in Prince Edward Island, Canada
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DOI：
10.1016/j.jembe.2006.10.017
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发表时间：
2007-03-26
影响因子：
2
通讯作者：
Miron, Gilles
中科院分区：
文献类型：
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作者：
Bourque, Daniel;Davidson, Jeffrey;Miron, Gilles
在过去的十年中，许多水生入侵物种被引入加拿大爱德华王子岛沿海水域，并对水产养殖业和渔业造成了不利影响。例如，在某些地区，贻贝养殖业已经被极其丰富的入侵海鞘海鞘淹没。为了了解和减少海鞘在其他贝类养殖场传播的风险，需要了解海鞘的基本生殖生物学信息。本文研究了海鞘的性腺发育、幼虫丰度和招募情况。性腺发育，用组织学方法，表明卵巢在2004年6月下旬至10月下旬成熟。每周水样显示，6月24日至10月29日有幼虫出现，8月中旬有明显的丰度高峰。征聘于6月24日至10月21日进行。幼虫取样的时间被认为是评估为监测目的而招募潜力的关键部分，并进行了实地实验以记录幼虫的时空浓度。数据是在2004年8月4日和9月14日30小时抽样期间收集的。每小时在三个深度同时采集水样：表面、2英寸和4英寸以下。结果表明，在大多数情况下，幼虫丰度高峰限制在下午早些时候的3 h时间间隔内。幼虫浓度随水深增加而增加。(c) 2006 Elsevier B.V.版权所有
In the past decade, many aquatic invasive species have been introduced into Prince Edward Island, Canada, coastal waters, and they have had adverse effects on the aquaculture and fisheries industry. For instance, the mussel aquaculture industry has been overwhelmed by extremely high abundances of the invasive ascidian Styela clava in some areas. To understand and minimize the risk of spread of S. clava to other shellfish aquaculture sites, basic information on the reproductive biology of the ascidian is needed. This study investigated Styela gonad development, larval abundance and recruitment. Gonad development, using histological methods, indicated ovaries were ripe from late June through late October, 2004. Weekly water samples indicated larvae were present from 24 June to 29 October, with a distinct abundance peak in mid-August. Recruitment occurred from 24 June to 21 October. Timing of larval sampling was judged to be a crucial part of evaluating recruitment potential for monitoring purposes and a field experiment was carried out to document spatio-temporal larval concentrations. Data were gathered over 30 h sampling periods on 4 August and 14 September 2004. Water samples were taken simultaneously on an hourly basis at three depths: surface, 2 in and 4 in below the surface. Results indicated peaks in larval abundance were, in most cases, limited to a 3 h time interval in the early afternoon. Larval concentrations increased with water depth. (c) 2006 Elsevier B.V. All rights reserved.