Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica
Feeding larvae of Antarctic bottom invertebrates have proven to be scarce in the plankton and consequently our knowledge of their ecology is limited. We collected bipinnaria larvae assignable to the genus Odontaster and several types of pilidium larvae of nemertean worms in quantitative net tows tak...
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ftillinoiswu:oai:digitalcommons.iwu.edu:bio_scholarship-1027 2023-05-15T13:49:22+02:00 Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica Jaeckle, William 2008-01-01T08:00:00Z application/pdf https://digitalcommons.iwu.edu/bio_scholarship/28 https://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=1027&context=bio_scholarship unknown Digital Commons @ IWU https://digitalcommons.iwu.edu/bio_scholarship/28 https://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=1027&context=bio_scholarship Scholarship Biology Physiology text 2008 ftillinoiswu 2022-04-10T20:31:59Z Feeding larvae of Antarctic bottom invertebrates have proven to be scarce in the plankton and consequently our knowledge of their ecology is limited. We collected bipinnaria larvae assignable to the genus Odontaster and several types of pilidium larvae of nemertean worms in quantitative net tows taken during the austral spring and summer 1997-1998 and considered their distribution with respect to the density stratification of the water column and the potential exposure to UV-B (λ = 308 nm). The average number of pilidium and bipinnaria larvae in the upper 40 m of the water column was 0.5 ± 1.0 per m3 and the highest abundance was 2.1 per m3 in early January when 270 bipinnariae were collected at a depth of 28 m. In October and November, water density (σ1) in the upper 40 m was relatively uniform and bipinnariae and pilidiums were collected from 2 m to the maximum depth sampled (20-38 m). Beginning in December and continuing into February, surface melt produced a marked stratification of the upper water column with a major discontinuity layer at 10-15 m, and larvae were relatively rare near the surface. Larvae drifting at a depth of 4 m during periods of ozone depletion in October and November 1997 would potentially experience average maximum UV-B exposures of 80.10 joules/m2/hr. Later in spring and summer, under a normal ozone column, average maximum potential exposures were 2.26 joules/m2/hr at 14 m, where larvae were abundant. The physiological and ecological consequences of high surface exposures to UV-B during periods of ozone depletion depend on several factors, including stage development and residence times of larvae near the surface, and remain largely unknown. Text Antarc* Antarctic Antarctica Anvers Island Illinois Wesleyan University: Digital Commons@IWU Antarctic Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Austral |
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Illinois Wesleyan University: Digital Commons@IWU |
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ftillinoiswu |
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unknown |
topic |
Biology Physiology |
spellingShingle |
Biology Physiology Jaeckle, William Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica |
topic_facet |
Biology Physiology |
description |
Feeding larvae of Antarctic bottom invertebrates have proven to be scarce in the plankton and consequently our knowledge of their ecology is limited. We collected bipinnaria larvae assignable to the genus Odontaster and several types of pilidium larvae of nemertean worms in quantitative net tows taken during the austral spring and summer 1997-1998 and considered their distribution with respect to the density stratification of the water column and the potential exposure to UV-B (λ = 308 nm). The average number of pilidium and bipinnaria larvae in the upper 40 m of the water column was 0.5 ± 1.0 per m3 and the highest abundance was 2.1 per m3 in early January when 270 bipinnariae were collected at a depth of 28 m. In October and November, water density (σ1) in the upper 40 m was relatively uniform and bipinnariae and pilidiums were collected from 2 m to the maximum depth sampled (20-38 m). Beginning in December and continuing into February, surface melt produced a marked stratification of the upper water column with a major discontinuity layer at 10-15 m, and larvae were relatively rare near the surface. Larvae drifting at a depth of 4 m during periods of ozone depletion in October and November 1997 would potentially experience average maximum UV-B exposures of 80.10 joules/m2/hr. Later in spring and summer, under a normal ozone column, average maximum potential exposures were 2.26 joules/m2/hr at 14 m, where larvae were abundant. The physiological and ecological consequences of high surface exposures to UV-B during periods of ozone depletion depend on several factors, including stage development and residence times of larvae near the surface, and remain largely unknown. |
format |
Text |
author |
Jaeckle, William |
author_facet |
Jaeckle, William |
author_sort |
Jaeckle, William |
title |
Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica |
title_short |
Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica |
title_full |
Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica |
title_fullStr |
Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica |
title_full_unstemmed |
Distribution of Bipinnaria and Pilidium in Relation to Physical Structure and UV-B Light in the Water Column off Anvers Island, Antarctica |
title_sort |
distribution of bipinnaria and pilidium in relation to physical structure and uv-b light in the water column off anvers island, antarctica |
publisher |
Digital Commons @ IWU |
publishDate |
2008 |
url |
https://digitalcommons.iwu.edu/bio_scholarship/28 https://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=1027&context=bio_scholarship |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) |
geographic |
Antarctic Anvers Anvers Island Austral |
geographic_facet |
Antarctic Anvers Anvers Island Austral |
genre |
Antarc* Antarctic Antarctica Anvers Island |
genre_facet |
Antarc* Antarctic Antarctica Anvers Island |
op_source |
Scholarship |
op_relation |
https://digitalcommons.iwu.edu/bio_scholarship/28 https://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=1027&context=bio_scholarship |
_version_ |
1766251268741791744 |