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Nutrient Cycling by Mussel Seed Coll...

van Broekhoven, Wouter,

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Nutrient Cycling by Mussel Seed Collectors /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nutrient Cycling by Mussel Seed Collectors // Wouter van Broekhoven.
作者:	van Broekhoven, Wouter,
面頁冊數:	1 electronic resource (217 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-05, Section: A.
Contained By:	Dissertations Abstracts International86-05A.
標題:	Plankton. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31724391
ISBN:	9798346571278

Nutrient Cycling by Mussel Seed Collectors /
van Broekhoven, Wouter,

Nutrient Cycling by Mussel Seed Collectors /Wouter van Broekhoven. - 1 electronic resource (217 pages)

Source: Dissertations Abstracts International, Volume: 86-05, Section: A.

Bivalve molluscs have been consumed by humans for over 100,000 years. In the present day, the vast majority of production is aquaculture based. Globally, farming of bivalves is still heavily reliant on supply of seed from wild fisheries. These fisheries are increasingly under pressure because of a growing concern about potential negative effects on the natural environment and conservation goals. Seed collector systems consisting of artificial substrate are successfully used in mussel aquaculture sectors such as the bouchot, raft and longline cultures around the globe. In the blue mussel (Mytilus edulis) aquaculture industry in the Netherlands, suspended seed collectors, known as Seed Mussel Collector (SMC) systems, are gradually replacing wild seed fishery. This results in an elevated biomass of mussels in the ecosystem during the summer growing season, spanning from spatfall in spring to harvest and relaying to bottom culture plots in autumn. Since mussel seed exhibit a proportionally high metabolic activity, the introduction of SMCs has the potential to increase pressures on the ecosystem from the mussels' filtration and metabolic activity. Bivalve suspension feeders exercise top-down (filtration) and bottomup (nutrient regeneration) control over phytoplankton populations. When phytoplankton becomes depleted, top-down filtration control can constitute a negative feedback onto growth rates of the bivalves, thus reducing the carrying capacity of the system for suspension feeding populations. On the other hand, bottom-up nutrient regeneration processes can constitute a positive feedback when phytoplankton productivity is stimulated and promotes growth rates of the bivalves. As the SMC culture cycle takes place during summer, it coincides with the period when phytoplankton is nutrient limited. Regenerated nutrients may therefore directly benefit primary production rates in the system, potentially counteracting part of the top-down control on phytoplankton.A quantitative understanding of nutrient cycling by mussel seed assemblages has been lacking. Previous studies in relation to nutrient cycling by bivalve suspension feeders investigated (adult) individual specimens in isolation, investigated a single direction of control i.e. top-down or bottom-up, or investigated a single macronutrient. A few studies have pointed to the significant role played by associated fauna, flora and organic matter (AFFOM) on suspended bivalve culture assemblages in nutrient cycling. Appraising the importance of community level interactions, the aim of this thesis was to investigate the contribution of suspended mussel seed collector communities to nutrient cycling. This was addressed via four objectives:i) Quantify filtration and nutrient release by SMC communities;ii) Develop a multi-element (N,P,Si) nutrient budget for an SMC community;iii) Measure farm scale depletion of seston and accumulation of nutrients under macrotidal conditions;iv) Explore the top-down and bottom-up regulation of phytoplankton by mussel seed, and evaluate its ecological relevance in the transition of wild seed fishery to SMCs.The thesis starts with a general introduction to the subject matter and the research aims (Chapter 1). Chapter 2then describes the transition to SMCs in the Dutch mussel sector, and presents detailed harvest data from 2010 until 2022. These data were analysed to investigate the efficiency of different systems, identify differences between years and areas, and assess how production can be optimized. Additionally, numerical density, biomass, and shell lengths of mussels from 0.375 mm shell length were recorded on SMC ropes at one SMC location during a full growth season to evaluate biomass-density relations and assess the process of self-thinning on the ropes.

English

ISBN: 9798346571278Subjects--Topical Terms:

1299572
Plankton.

Nutrient Cycling by Mussel Seed Collectors /
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