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278 results on '"Smaal, A. C."'

1. Records reveal the vast historical extent of European oyster reef ecosystems

Author

Thurstan, Ruth H., McCormick, Hannah, Preston, Joanne, Ashton, Elizabeth C., Bennema, Floris P., Cetinić, Ana Bratoš, Brown, Janet H., Cameron, Tom C., da Costa, Fiz, Donnan, David W., Ewers, Christine, Fortibuoni, Tomaso, Galimany, Eve, Giovanardi, Otello, Grancher, Romain, Grech, Daniele, Hayden-Hughes, Maria, Helmer, Luke, Jensen, K. Thomas, Juanes, José A., Latchford, Janie, Moore, Alec B. M., Moutopoulos, Dimitrios K., Nielsen, Pernille, von Nordheim, Henning, Ondiviela, Bárbara, Peter, Corina, Pogoda, Bernadette, Poulsen, Bo, Pouvreau, Stéphane, Roberts, Callum M., Scherer, Cordula, Smaal, Aad C., Smyth, David, Strand, Åsa, Theodorou, John A., and zu Ermgassen, Philine S. E.

Published
2024
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2. Historical dataset details the distribution, extent and form of lost Ostrea edulis reef ecosystems

Author

Thurstan, Ruth H., McCormick, Hannah, Preston, Joanne, Ashton, Elizabeth C., Bennema, Floris P., Bratoš Cetinić, Ana, Brown, Janet H., Cameron, Tom C., da Costa, Fiz, Donnan, David W., Ewers, Christine, Fortibuoni, Tomaso, Galimany, Eve, Giovanardi, Otello, Grancher, Romain, Grech, Daniele, Hayden-Hughes, Maria, Helmer, Luke, Jensen, K. Thomas, Juanes, José A., Latchford, Janie, Moore, Alec B. M., Moutopoulos, Dimitrios K., Nielsen, Pernille, von Nordheim, Henning, Ondiviela, Bárbara, Peter, Corina, Pogoda, Bernadette, Poulsen, Bo, Pouvreau, Stéphane, Scherer, Cordula, Smaal, Aad C., Smyth, David, Strand, Åsa, Theodorou, John A., and zu Ermgassen, Philine S. E.

Published
2024
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8. MORPHOLOGICAL AND MITOCHONDRIAL DNA ANALYSES OF OYSTERS IN THE NORTHERN BAY OF BENGAL, BANGLADESH

Author

Chowdhury, Mohammed S. N., Reece, Kimberly S., Joy, Sourav S., Coen, Loren D., and Smaal, Aad C.

Subjects
Genetic research, Cytochrome oxidase, Aquaculture industry, Crassostrea, Phylogeny, Oysters, Mitochondrial DNA, Biological sciences, Zoology and wildlife conservation
Abstract

The geographic boundaries of many important habitat-building shallow estuarine oyster (Family Ostreidae) species are poorly understood, especially in subtropical and tropical waters. These keystone species often have extensive historical and extant ranges, in part because of their ability to adapt to diverse environmental conditions and the transfer and introduction of a few species worldwide for aquaculture production. In addition, oysters exhibit morphological plasticity additionally confounding species identification and taxonomy. Molecular techniques have led to significant improvements in oyster systematics and taxonomy but have not been applied to oysters from many tropical regions, including the coastal areas of the Indian Ocean such as Bangladesh. Because species' identification based on morphological traits alone, in this case primarily shell characteristics, were inadequate, phylogenetic analyses of mitochondrial cytochrome oxidase subunit I gene fragments was also done to confirm the identity of oyster specimens collected from Bangladesh coastal waters. Phylogenetic analyses of collected oyster samples confirmed the two monophyletic subclades of the Ostreidae family Crassostrea and Saccostrea. and five oyster lineages from the region of Bangladesh were identified: Crassostrea gryphoides, Crassostrea belcheri. Saccostrea cuccullata lineage B. 5. cuccullata lineage F, and Saccostrea mordax. A new addition to the list of Crassostrea species, C belcheri was found in Bangladesh, but C. belcheri, C. gryphoides, and 5. cuccullata are. considered 'common' species in the neighboring states of India and Myanmar indicating a widespread distribution of these species along the entire coast of the Bay of Bengal. However, S. mordax, is a new record for the Bay of Bengal region including the coastal waters of Andaman and Nicobar Islands, and thus extends the geographical distribution of this species. KEY WORDS: Bay of Bengal, shell plasticity, morphology, cytochrome oxidase subunit I (COI). Saccostrea mordax, INTRODUCTION Oysters (Family Ostreidae) are considered keystone species and commonly referred to as 'ecosystem engineers' for their ability to exert a large influence on the ecosystem function in coastal waters [...]

Published
2021
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38. Ulva spp. performance and biomitigation potential under high nutrient concentrations : implications for recirculating IMTA systems

Author

Nederlof, Marit A.J., Neori, Amir, Verdegem, Marc C.J., Smaal, Aad C., Jansen, Henrice M., Nederlof, Marit A.J., Neori, Amir, Verdegem, Marc C.J., Smaal, Aad C., and Jansen, Henrice M.

Abstract

The growth, tissue content and nutrient removal rates of Ulva spp., when exposed to moderate to high nitrogen (0.5–5 mmol L−1) and phosphorus (0.01–0.9 mmol L−1) concentrations, were examined to get a better understanding of recirculating IMTA (Integrated Multi-Trophic Aquaculture) systems with fish and seaweed. It was hypothesized that fish waste effluents might lead to unfavorable nutrient stoichiometry and/or toxic conditions, which might harm seaweeds and, specifically for the present study, reduce Ulva spp. performance. Results demonstrate that: (I) the unfavorable N:P stoichiometry (N:P ≠ Atkinson atomic ratio of 30:1) did not restrict Ulva spp. growth nor tissue content; this indicates that supply of both nutrients exceeded the minimum requirements; (II) a high orthophosphate concentration (0.9 mmol L−1) was toxic to Ulva spp., whereas (III) a high nitrate concentration (5 mmol L−1) did not inhibit phosphorus uptake; (IV) Ulva’s growth was not enhanced when nitrate was exchanged for similarly high ammonium concentrations. However, tissue nitrogen content was 1.4 times higher when exposed to ammonium than nitrate, suggesting that the former N-form was stored faster in the seaweed’s tissue. Therefore, other factors must have limited growth with the high ammonium concentrations. This study also highlights the importance of relatively long acclimatization periods (one week) when maintenance uptake (Vm) is evaluated, as surge uptake (Vs) may result in considerably different and more variable rates. Results of this study contribute to a better understanding of the application of Ulva spp. as extractive component in closed IMTA systems, thus advancing sustainable and circular production techniques.

Published
2022

39. Nutrient retention efficiencies in integrated multi‐trophic aquaculture

Author

Nederlof, Marit A.J., Verdegem, Marc C.J., Smaal, Aad C., Jansen, Henrice M., Nederlof, Marit A.J., Verdegem, Marc C.J., Smaal, Aad C., and Jansen, Henrice M.

Abstract

One of the bottlenecks for commercial implementation of integrated multi-trophic aquaculture (IMTA) is the difficulty in quantifying its environmental performance. We reviewed a large body of literature to determine the variability in nutrient dynamics within different IMTA systems (open sea-cages, land-based flow-through and recirculating aquaculture systems), with the aim to provide a generic framework to quantify nutrient retention efficiencies in integrated aquaculture systems. Based on the ecophysiological requirements of the cultured species, as well as the response of “extractive” species to waste from “fed” species, the maximum retention efficiency was defined for a conceptual four-species marine IMTA system (fish–seaweed–bivalve–deposit feeder). This demonstrated that 79%–94% of nitrogen, phosphorus and carbon supplied with fish feed could theoretically be retained. In practice, however, various biological and environmental factors may limit retention efficiencies and thereby influence the bioremediation of IMTA systems. These biological (waste production, stoichiometry in nutrient requirements) and environmental (temporal and spatial connectivity) factors were therefore evaluated against the theoretical reference frame and showed that efficiencies of 45%–75% for closed systems and 40%–50% for open systems are more realistic. This study is thereby the first to provide quantitative estimates for nutrient retention across IMTA systems, demonstrating that a substantial fraction of nutrients released from fish culture units can be retained by extractive species and subsequently harvested. Furthermore, by adapting this framework to the design and the condition prevailing for a specific IMTA system, it becomes a generic tool to analyse the system's bioremediation potential and explore options for further improvement.

Published
2022

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