Universität zu Köln

Borcherding, Jost ORCID: 0000-0003-3411-5861, Kiel, Stephanie, Struebig, Anke and Arndt, Hartmut ORCID: 0000-0003-2811-3595 (2017). Vertical migration of Daphnia galeata - Evidence for the use of an alternative resource from a lethal environment. Limnologica, 62. S. 132 - 140. MUNICH: ELSEVIER GMBH. ISSN 1873-5851

Full text not available from this repository.

Abstract

Metazoans normally avoid anaerobic environments, at least when they are combined with toxic stress due to hydrogen sulfide. In Lake Speldrop, a small but deep gravel pit lake at the Lower Rhine, Daphnia galeata was found not only to dominate the zooplankton community, but was also regularly found in anoxic and even sulfidic layers during summer. We conducted field experiments with a newly developed Zoo-plankton In-situ Incubator, simulating vertical migrations of D. galeata. When daphnids were exposed to sulfidic conditions, mortality increased with exposure time, revealing LT50-values between 129 and 42 min in relation to increasing concentrations of sulfide. Additionally, those experimental individuals originating from 12.5 m depth showed significantly higher mortality rates than those from 7.5 m depth. Further migration experiments showed that an interruption period of sulfidic exposition in less stressful environments reduced mortality rates significantly. Daphnids found in the hypolimnion belonged partly to moribund parts of the population; however, the majority of daphnids showed regular mowing activity and was able to withstand sulfidic conditions in the hypolimnion for a limited time. It is so far unclear what maybe the major ultimate factor for this type of short term migratory behavior, to seek for shelter or to use high amounts of sulfur bacteria as an alternative food resource. (C) 2016 Elsevier GmbH. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Borcherding, Jost UNSPECIFIED orcid.org/0000-0003-3411-5861 UNSPECIFIED Kiel, Stephanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Struebig, Anke UNSPECIFIED UNSPECIFIED UNSPECIFIED Arndt, Hartmut UNSPECIFIED orcid.org/0000-0003-2811-3595 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-246499
DOI:	10.1016/j.limno.2016.11.010
Journal or Publication Title:	Limnologica
Volume:	62
Page Range:	S. 132 - 140
Date:	2017
Publisher:	ELSEVIER GMBH
Place of Publication:	MUNICH
ISSN:	1873-5851
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEMOGLOBIN CONCENTRATION; SULFIDE; MAGNA; ZOOPLANKTON; TOLERANCE; PREDATION; FOOD; LAKE; AVAILABILITY; TOXICITY Multiple languages Limnology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24649