RUI: Dissolution Mortality of Juvenile Bivalves in Coastal Marine Deposits.
RUI:沿海海洋沉积物中幼年双壳类的溶解死亡率。
基本信息
- 批准号:0622999
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2006
- 资助国家:美国
- 起止时间:2006-11-01 至 2010-10-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
ABSTRACTProposal # OCE-0622999Despite major advances towards understanding the factors controlling invertebrate recruitment to benthic communities, many questions remain regarding causes of the extreme juvenile mortality of post-larval bivalves. It is now widely recognized that carbonate undersaturation is a common feature in temperate, coastal, organic-rich surface sediments that are dominated by deposit feeding benthos where many organisms have calcium carbonate shells. Such undersaturation may make it difficult for recently settled, juvenile bivalves to form their shell, and so shell dissolution could represent a significant source of mortality for juvenile bivalves. If true, there would be important implications for benthic community recruitment, survivorship, and the coupling between early diagenetic processes and benthic community form and function. In this research, a PI from St. Joseph's College will conduct a multi-faceted study that will: (1) determine the effect of carbonate saturation state at the sediment-water interface on recruitment and survivorship of juvenile bivalves following their transition from pediveligers to new juveniles in intertidal mud, (2) evaluate the chemical (reaction) and biotic (transport) processes that control saturation state in these same muds and, (3) develop coupled stage-based/diagenetic models of juvenile bivalve shell dissolution mortality under "scenarios" of carbonate saturation due to variability in the carbonate cycle. Studies will be conducted on the commercially valuable species Mya arenaria and Mercenaria mercenaria. Fieldwork will be conducted at two sites in Casco Bay, Gulf of Maine, that differ in their biological and diagenetic characteristics, yet both have substantial sets of Mercenaria and Mya. The field research will focus on cohort monitoring of Mya and Mercenaria and the effect of carbonate mineral saturation state on the variability in juvenile abundance. "Sediment buffering" experiments will be used to discern if CaCO3 buffering of surface sediments immediately following the set prevents undersaturation by limiting external shell dissolution of juveniles. The site comparisons will permit examination of the importance of dissolution mortality as a function of both the biotic and diagenetic setting. Sampling at low water and mid-upper intertidal heights within each site will examine variability in dissolution mortality as a function of tidal exposure. Laboratory experiments will artificially regulate surface sediment saturation state, and thus juvenile bivalve habitat, while maintaining supersaturated conditions in the overlying water. Dissolution mortality experiments will determine "threshold" saturation states below which external shell dissolution mortality occurs for specific size classes of Mercenaria and Mya (2.0 mm). Additional laboratory experiments will determine the immediate response of bivalves to sediment surfaces of different saturation states using a combination of direct observations and flume experiments. The collective results from the field and laboratory will be used to model scenarios of dissolution mortality in both species due to anthropogenic and natural changes in carbonate cycling.Broader impacts of this study include both an extremely strong educational component and important societal benefits. Saint Joseph's College of Maine is an undergraduate institution with about 70% of women in the student body. The immersion of students into research will build on the PI's prior CAREER award and promote students attending and/or presenting research results at national/international conferences contributing as coauthors on manuscripts. Improved understanding of juvenile bivalve mortality could have important impact on management of coastal fisheries. Finally, this research would place coastal populations of juvenile bivalves into context with open ocean plankton with carbonate shells and corals that are currently expected to suffer from similar problems with shell formation and subsequent mortality.
摘要提案号OCE-0622999尽管在了解控制底栖生物群落的无脊椎动物补充的因素方面取得了重大进展,但关于双壳类幼体后期极端幼鱼死亡率的原因仍存在许多问题。 现在人们普遍认识到,碳酸盐不饱和是温带、沿海、富含有机物的表层沉积物的一个共同特征,这些表层沉积物主要是以存款为食的底栖生物,其中许多生物具有碳酸钙外壳。这种不饱和度可能使最近定居的幼年双壳类难以形成它们的壳,因此壳溶解可能是幼年双壳类死亡的一个重要来源。 如果这是真的,将对底栖生物群落的补充、生存以及早期成岩过程与底栖生物群落形式和功能之间的耦合产生重要影响。 在这项研究中,来自圣约瑟夫学院的PI将进行多方面的研究,将:(1)确定沉积物-水界面的碳酸盐饱和状态对双壳类幼贝在潮间泥中从幼贝转变为新幼贝后的补充和存活的影响,(2)评价化学品(反应)和生物控制这些相同泥浆中的饱和状态的(运输)过程,(3)在碳酸盐循环变化导致碳酸盐饱和的“情景”下,建立基于阶段的/成岩作用的幼年双壳类贝壳溶解死亡率耦合模型。将对具有商业价值的物种沙蝇和粘虫进行研究。 野外工作将在缅因州湾卡斯科湾的两个地点进行,这两个地点的生物学和成岩特征不同,但都有大量的雇佣军和Mya。 实地研究将侧重于Mya和Mercenaria的队列监测以及碳酸盐矿物饱和状态对少年丰度变化的影响。“沉积物缓冲”实验将被用来辨别是否CaCO 3缓冲表层沉积物后立即设置防止不饱和限制外壳溶解的少年。 现场比较将允许检查溶解死亡率作为生物和成岩背景的函数的重要性。在每个站点内的低潮和中上潮间带高度取样,将检查溶解死亡率随潮汐暴露的变化。实验室实验将人工调节表层沉积物的饱和状态,从而调节幼贝的栖息地,同时保持上覆水的过饱和状态。 溶解死亡率实验将确定“阈值”饱和状态,低于该饱和状态,特定尺寸等级的Mercenaria和Mya(2.0 mm)的外壳溶解死亡率发生。 其他实验室实验将结合直接观察和水槽实验,确定双壳类对不同饱和状态沉积物表面的即时反应。从现场和实验室的集体结果将被用来模拟溶解死亡率在这两个物种由于人为和自然的变化碳酸盐cycling.Broader影响,这项研究包括一个非常强大的教育组成部分和重要的社会效益的情景。 缅因州的圣约瑟夫学院是一所本科院校,学生中约有70%是女性。学生沉浸在研究将建立在PI的先前职业奖,并促进学生参加和/或在国家/国际会议上展示研究成果,作为手稿的合著者。 提高对双壳类幼贝死亡率的认识可能对沿海渔业管理产生重要影响。 最后,这项研究将把沿海种群的少年双壳类与开放的海洋浮游生物与碳酸盐外壳和珊瑚,目前预计将遭受类似的问题与外壳的形成和随后的死亡率。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Known CDN Request-Routing Mechanisms
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2002 - 期刊:
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The Transterpreter: A Transputer Interpreter
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2004 - 期刊:
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1990 - 期刊:
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Tenure: An Important Due Process Right or a Hindrance to Change in the Schools?
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10.1007/s11092-006-9020-5 - 发表时间:
2006-09-09 - 期刊:
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Synthesis and molecular structure of [CpRu(1,4,7-S3C6H12)]O3SCF3
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10.1023/a:1009561531985 - 发表时间:
1999-03-01 - 期刊:
- 影响因子:0.600
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Mark Green;M. Draganjac;Yanjing Jiang;A.W. Cordes - 通讯作者:
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Mark Green的其他文献
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1926463 - 财政年份:2020
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1240593 - 财政年份:2012
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RUI: River and sediment-modulated stress in planktonic and early settlement Mya arenaria
RUI:浮游生物和早期定居的河流和沉积物调节的胁迫
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0442015 - 财政年份:2004
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