Universität zu Köln

Kureck, Armin, Bieg, Rosita, Wendeler, Rosalinde and Borcherding, Jost ORCID: 0000-0003-3411-5861 (2014). Fecundity of the mayfly Ephoron virgo (Olivier, 1791) (Ephemeroptera: Polymitarcyidae): A long-term study in the River Rhine. Limnologica, 47. S. 1 - 7. JENA: ELSEVIER GMBH, URBAN & FISCHER VERLAG. ISSN 1873-5851

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Abstract

The fecundity of the mayfly Ephoron virgo in the River Rhine was studied over a period of twelve years (1992-2003) and compared to four European rivers in 1998. The field data were complemented by mass-rearing in flumes with fresh running river water (1999-2001). The dry mass of a single egg averaged to 4.15 +/- 0.25 mu g, without any significant spatial or temporal differences. Total egg mass per female was found as a reliable measurement of fecundity in E. virgo that significantly increased with increasing weight of a female. Within a sample, individual females differed tremendously in egg numbers. This high variability remained even under more homogenous conditions in a densely populated experimental flume. In 1998, fecundity of E. virgo in the Rhine tributaries of Main and Neckar was significantly lower than in the rivers Rhine and Lahn, averaging between about 2500 and 4100 eggs per female, respectively. Fecundity did not differ throughout the flight period at the Rhine. Though differences in fecundity between 1992 and 2003 were observed in the Rhine, no clear temporal tendency could be detected. Under extremely high population densities of E. virgo in experimental flumes, fecundity was slightly lower compared to parallel field samples. Based on these fecundity data, the decline of the population of E. virgo in the Lower Rhine is discussed with respect to some potential environmental factors, giving clear hints that it is not a simple effect of food limitation. (C) 2014 Elsevier GmbH. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kureck, Armin UNSPECIFIED UNSPECIFIED UNSPECIFIED Bieg, Rosita UNSPECIFIED UNSPECIFIED UNSPECIFIED Wendeler, Rosalinde UNSPECIFIED UNSPECIFIED UNSPECIFIED Borcherding, Jost UNSPECIFIED orcid.org/0000-0003-3411-5861 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-438664
DOI:	10.1016/j.limno.2014.02.001
Journal or Publication Title:	Limnologica
Volume:	47
Page Range:	S. 1 - 7
Date:	2014
Publisher:	ELSEVIER GMBH, URBAN & FISCHER VERLAG
Place of Publication:	JENA
ISSN:	1873-5851
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ALBUM SAY EPHEMEROPTERA; LIFE-HISTORY; DIKEROGAMMARUS-VILLOSUS; LEUKON EPHEMEROPTERA; BODY SIZE; EPHEMERIDAE; SHIGAE; TEMPERATURE; POPULATION; EMERGENCE Multiple languages Limnology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43866