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Article: Bioenergetics, growth and reproduction of amphipods are affected by moderately low oxygen regimes

TitleBioenergetics, growth and reproduction of amphipods are affected by moderately low oxygen regimes
Authors
KeywordsAmphipod
Growth
Oxygen
Reproduction
RNA:DNA ratio
Issue Date2005
PublisherInter-Research. The Journal's web site is located at http://www.int-res.com/journals/meps/index.html
Citation
Marine Ecology Progress Series, 2005, v. 297, p. 215-223 How to Cite?
AbstractLow dissolved oxygen poses a major threat to coastal marine ecosystems worldwide. This study demonstrates that both growth and reproduction of the amphipod Melita longidactyla are impaired even by moderately low dissolved oxygen levels (3.5 to 4.5 mg O2 l-1), which are higher than levels considered to be hypoxic (2.8 mg O2 l-1). Negative growth and decreases in respiratory energy expenditure were observed after exposure to moderately low oxygen levels for 3 wk. The RNA:DNA ratio was most sensitive, and decreased significantly (by 50 to 86 %) following exposure to 4.5 and 3.5 mg O2 l-1 for 1 wk. Amphipods exposed to 3.5 or 4.5 mg O2 l-1 for 1 wk followed by recovery in normoxia for a further week exhibited no significant change in growth, energy consumption, respiratory energy expenditure and scope for growth compared with individuals kept in normoxia for the whole period. Complete reproductive failure occurred when amphipods were exposed to 3.5 mg O2 l-1 for 1 mo; however, no significant difference was found in percentage copulation, number of broods and offspring or fecundity between the normoxic control and the 4.5 mg O2 l-1 treatment group, indicating that reproductive impairment occurs within a narrow range of oxygen decrease below 4.5 mg O2 l-1. M. longidactyla plays an important role in trophodynamics and nutrient recycling and is abundant along the Chinese coast, where dissolved oxygen is often low. Our results suggest that natural populations of this species are potentially under threat, and the present water quality objective of 4 mg O2 l-1 adopted in some countries/places may not afford protection for this ecologically important species. © Inter-Research 2005.
Persistent Identifierhttp://hdl.handle.net/10722/92694
ISSN
2015 Impact Factor: 2.361
2015 SCImago Journal Rankings: 1.554
References

 

DC FieldValueLanguage
dc.contributor.authorWu, RSSen_HK
dc.contributor.authorOr, YYen_HK
dc.date.accessioned2010-09-17T10:54:25Z-
dc.date.available2010-09-17T10:54:25Z-
dc.date.issued2005en_HK
dc.identifier.citationMarine Ecology Progress Series, 2005, v. 297, p. 215-223en_HK
dc.identifier.issn0171-8630en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92694-
dc.description.abstractLow dissolved oxygen poses a major threat to coastal marine ecosystems worldwide. This study demonstrates that both growth and reproduction of the amphipod Melita longidactyla are impaired even by moderately low dissolved oxygen levels (3.5 to 4.5 mg O2 l-1), which are higher than levels considered to be hypoxic (2.8 mg O2 l-1). Negative growth and decreases in respiratory energy expenditure were observed after exposure to moderately low oxygen levels for 3 wk. The RNA:DNA ratio was most sensitive, and decreased significantly (by 50 to 86 %) following exposure to 4.5 and 3.5 mg O2 l-1 for 1 wk. Amphipods exposed to 3.5 or 4.5 mg O2 l-1 for 1 wk followed by recovery in normoxia for a further week exhibited no significant change in growth, energy consumption, respiratory energy expenditure and scope for growth compared with individuals kept in normoxia for the whole period. Complete reproductive failure occurred when amphipods were exposed to 3.5 mg O2 l-1 for 1 mo; however, no significant difference was found in percentage copulation, number of broods and offspring or fecundity between the normoxic control and the 4.5 mg O2 l-1 treatment group, indicating that reproductive impairment occurs within a narrow range of oxygen decrease below 4.5 mg O2 l-1. M. longidactyla plays an important role in trophodynamics and nutrient recycling and is abundant along the Chinese coast, where dissolved oxygen is often low. Our results suggest that natural populations of this species are potentially under threat, and the present water quality objective of 4 mg O2 l-1 adopted in some countries/places may not afford protection for this ecologically important species. © Inter-Research 2005.en_HK
dc.languageengen_HK
dc.publisherInter-Research. The Journal's web site is located at http://www.int-res.com/journals/meps/index.htmlen_HK
dc.relation.ispartofMarine Ecology Progress Seriesen_HK
dc.subjectAmphipoden_HK
dc.subjectGrowthen_HK
dc.subjectOxygenen_HK
dc.subjectReproductionen_HK
dc.subjectRNA:DNA ratioen_HK
dc.titleBioenergetics, growth and reproduction of amphipods are affected by moderately low oxygen regimesen_HK
dc.typeArticleen_HK
dc.identifier.emailWu, RSS: rudolfwu@hku.hken_HK
dc.identifier.authorityWu, RSS=rp01398en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-24044455381en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-24044455381&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume297en_HK
dc.identifier.spage215en_HK
dc.identifier.epage223en_HK
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridWu, RSS=7402945079en_HK
dc.identifier.scopusauthoridOr, YY=8703985200en_HK

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