Ecophysiological responses of juvenile summer and winter flounder to hypoxia: experimental and modeling analyses of effects on estuarine nursery quality

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Author(s)Stierhoff, Kevin L.
Author(s)Targett, Timothy E.
Author(s)Miller, KerriLynn
Ordered AuthorKevin L. Stierhoff, Timothy E. Targett, KerriLynn Miller
UD AuthorStierhoff, Kevin L.en_US
UD AuthorTargett, Timothy E.en_US
UD AuthorMiller, KerriLynnen_US
Date Accessioned2018-06-01T14:36:46Z
Date Available2018-06-01T14:36:46Z
Copyright DateCopyright © Inter-Research 2006en_US
Publication Date2006-11-07
DescriptionPublisher's PDFen_US
AbstractGrowth and feeding rates were measured in juvenile summer flounder Paralichthys dentatus and winter flounder Pseudopleuronectes americanus exposed to sub-lethal hypoxia (low dissolved oxygen, DO) over a range of temperatures, to determine its potential effects on nursery habitat quality for these 2 estuary-dependent flatfishes. Growth rates of both species were generally reduced as DO decreased, particularly at DO levels of 50 to 70% air saturation, and as temperature increased. Summer flounder were more tolerant of low DO than were winter flounder at both 20 and 25°C. At these temperatures, summer flounder growth was reduced by ~25% (compared to growth at normoxia [7.0 mg O2 l–1]) at 3.5 mg O2 l–1 and by 50 to 60% at 2.0 mg O2 l–1. In contrast, growth of winter flounder at 20°C was reduced by ~50% at both 3.5 and 5.0 mg O2 l–1, and growth was zero at 2.0 mg O2 l–1. At 25°C, winter flounder grew poorly in all DO treatments and lost weight at 2.0 mg O2 l–1. Summer flounder were also tested at 30°C. Growth was significantly reduced even at 5.0 mg O2 l–1, and was reduced by ~90% at 2.0 mg O2 l–1. A significant relationship between feeding rate and growth suggested reduced consumption to be a major cause of growth limitation under hypoxia. There was no evidence of growth acclimation for either species after 7 to 14 d exposure to hypoxia. The effect of hypoxia on growth of summer flounder was reduced at lower salinity (15 vs. 25‰) and was unaffected by the presence of a sand substrate. Similarity between modeled growth under hypoxic conditions, based on our laboratory results, and observed growth of summer flounder in a hypoxic estuarine tributary suggests growth limitation in the wild. These laboratory and field results demonstrate that even moderate hypoxia can adversely affect growth rates, and thus the quality of estuarine nursery habitats for juvenile flatfishes.en_US
DepartmentUniversity of Delaware. College of Marine and Earth Studies.en_US
CitationStierhoff, Kevin L., Timothy E. Targett, and KerriLynn Miller. "Ecophysiological responses of juvenile summer and winter flounder to hypoxia: experimental and modeling analyses of effects on estuarine nursery quality." Marine Ecology Progress Series 325 (2006): 255-266.en_US
DOIhttp://www.jstor.org/stable/24870681en_US
ISSN0171-8630 ; e- 1616-1599en_US
URLhttp://udspace.udel.edu/handle/19716/23551
Languageen_USen_US
PublisherInter-Researchen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceMarine Ecology Progress Seriesen_US
dc.source.urihttps://www.int-res.com/journals/meps/meps-home/en_US
TitleEcophysiological responses of juvenile summer and winter flounder to hypoxia: experimental and modeling analyses of effects on estuarine nursery qualityen_US
TypeArticleen_US
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