Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?

The seasonal change in depth distribution of Arctica islandica (Linne) larvae at a station on the Southern New England Shelf for the period April-December 1981 is compared with the output of a numerical model designed to predict distribution in a scenario where active depth regulation predominates....

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Main Author: Mann, Roger L.
Format: Text
Language:unknown
Published: W&M ScholarWorks 1986
Subjects:
Online Access:https://scholarworks.wm.edu/vimsarticles/2177
https://scholarworks.wm.edu/context/vimsarticles/article/3177/viewcontent/Mann_1986_Arctica_islandica.pdf
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spelling ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-3177 2023-06-11T04:10:03+02:00 Arctica islandica (Linne) Larvae: Active depth regulators or passive particles? Mann, Roger L. 1986-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/2177 https://scholarworks.wm.edu/context/vimsarticles/article/3177/viewcontent/Mann_1986_Arctica_islandica.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/2177 https://scholarworks.wm.edu/context/vimsarticles/article/3177/viewcontent/Mann_1986_Arctica_islandica.pdf VIMS Articles Fisheries Science Peer-Reviewed Articles Marine Biology text 1986 ftwilliammarycol 2023-05-04T17:48:25Z The seasonal change in depth distribution of Arctica islandica (Linne) larvae at a station on the Southern New England Shelf for the period April-December 1981 is compared with the output of a numerical model designed to predict distribution in a scenario where active depth regulation predominates. Larvae in excess of 200 J.Lm length were present in the field in May at 1-30 m depth and, at depths of 20-40 m from late July through November. The majority of larvae captured in November were shelled veligers of 110 J.Lm length. Good agreement of the model with field data exists with respect to absence of A. islandica larvae in the warm (> 18°C) shallow (0-20 m) waters between July and early September, and the abundance of larvae throughout the depth range 20-40 m from July through October. The model predicts occurrence of larvae in June; however, they were not seen in the field . The discrepancy can be due to the combination of reduced spawning by adult A. islandica (which is not included in the model) and less than optimum conditions for larval development. The model predicts aggregation of the negatively geotactic larvae at the surface following decay of a seasonal thermocline. Such aggregations were not seen in the field indicating that vertical mixing of the water column in the fall months is sufficient to negate distribution patterns dominated by active depth regulation . Depending upon the nature, intensity and stability of stratification of the water column, it is evident that depth distribution of A. islandica larvae can be dominated by either active depth regulation or passive movement at the mercy of physical mixing. The conditions of transition from active to passively dominated dispersal and distribution are poorly defined. Text Arctica islandica W&M ScholarWorks
institution Open Polar
collection W&M ScholarWorks
op_collection_id ftwilliammarycol
language unknown
topic Fisheries Science Peer-Reviewed Articles
Marine Biology
spellingShingle Fisheries Science Peer-Reviewed Articles
Marine Biology
Mann, Roger L.
Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?
topic_facet Fisheries Science Peer-Reviewed Articles
Marine Biology
description The seasonal change in depth distribution of Arctica islandica (Linne) larvae at a station on the Southern New England Shelf for the period April-December 1981 is compared with the output of a numerical model designed to predict distribution in a scenario where active depth regulation predominates. Larvae in excess of 200 J.Lm length were present in the field in May at 1-30 m depth and, at depths of 20-40 m from late July through November. The majority of larvae captured in November were shelled veligers of 110 J.Lm length. Good agreement of the model with field data exists with respect to absence of A. islandica larvae in the warm (> 18°C) shallow (0-20 m) waters between July and early September, and the abundance of larvae throughout the depth range 20-40 m from July through October. The model predicts occurrence of larvae in June; however, they were not seen in the field . The discrepancy can be due to the combination of reduced spawning by adult A. islandica (which is not included in the model) and less than optimum conditions for larval development. The model predicts aggregation of the negatively geotactic larvae at the surface following decay of a seasonal thermocline. Such aggregations were not seen in the field indicating that vertical mixing of the water column in the fall months is sufficient to negate distribution patterns dominated by active depth regulation . Depending upon the nature, intensity and stability of stratification of the water column, it is evident that depth distribution of A. islandica larvae can be dominated by either active depth regulation or passive movement at the mercy of physical mixing. The conditions of transition from active to passively dominated dispersal and distribution are poorly defined.
format Text
author Mann, Roger L.
author_facet Mann, Roger L.
author_sort Mann, Roger L.
title Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?
title_short Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?
title_full Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?
title_fullStr Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?
title_full_unstemmed Arctica islandica (Linne) Larvae: Active depth regulators or passive particles?
title_sort arctica islandica (linne) larvae: active depth regulators or passive particles?
publisher W&M ScholarWorks
publishDate 1986
url https://scholarworks.wm.edu/vimsarticles/2177
https://scholarworks.wm.edu/context/vimsarticles/article/3177/viewcontent/Mann_1986_Arctica_islandica.pdf
genre Arctica islandica
genre_facet Arctica islandica
op_source VIMS Articles
op_relation https://scholarworks.wm.edu/vimsarticles/2177
https://scholarworks.wm.edu/context/vimsarticles/article/3177/viewcontent/Mann_1986_Arctica_islandica.pdf
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