Universität zu Köln

Heermann, Lisa, DeAngelis, Donald L. and Borcherding, Jost ORCID: 0000-0003-3411-5861 (2017). A new mechanistic approach for the further development of a population with established size bimodality. PLoS One, 12 (6). SAN FRANCISCO: PUBLIC LIBRARY SCIENCE. ISSN 1932-6203

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Abstract

Usually, the origin of a within-cohort bimodal size distribution is assumed to be caused by initial size differences or by one discrete period of accelerated growth for one part of the population. The aim of this study was to determine if more continuous pathways exist allowing shifts from the small to the large fraction within a bimodal age-cohort. Therefore, a Eurasian perch population, which had already developed a bimodal size-distribution and had differential resource use of the two size-cohorts, was examined. Results revealed that formation of a bimodal size-distribution can be a continuous process. Perch from the small size-cohort were able to grow into the large size-cohort by feeding on macroinvertebrates not used by their conspecifics. The diet shifts were accompanied by morphological shape changes. Intra-specific competition seemed to trigger the development towards an increasing number of large individuals. A stage-structured matrix model confirmed these assumptions. The fact that bimodality can be a continuous process is important to consider for the understanding of ecological processes and links within ecosystems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Heermann, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED DeAngelis, Donald L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borcherding, Jost UNSPECIFIED orcid.org/0000-0003-3411-5861 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-227190
DOI:	10.1371/journal.pone.0179339
Journal or Publication Title:	PLoS One
Volume:	12
Number:	6
Date:	2017
Publisher:	PUBLIC LIBRARY SCIENCE
Place of Publication:	SAN FRANCISCO
ISSN:	1932-6203
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PERCH PERCA-FLUVIATILIS; THE-YEAR PERCH; ONTOGENIC NICHE SHIFTS; INTRASPECIFIC COMPETITION; PHENOTYPIC PLASTICITY; LARGEMOUTH BASS; FOOD RESOURCES; LIFE-HISTORY; MICROPTERUS-SALMOIDES; GROWTH TRAJECTORIES Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22719