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The effect of seed morphology on the potential dispersal of aquatic macrophytes by the common carp (Cyprinus carpio)

Pollux, B.J.A. and Jong de, M. and Steegh, A. and Ouborg, N.J. and Van Groenendael, J.M. and Klaassen, M.R.J. (2006) The effect of seed morphology on the potential dispersal of aquatic macrophytes by the common carp (Cyprinus carpio). Freshwater Biology, 51, 2063-2071. ISSN 0046-5070.

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Official URL: http://dx.doi.org/10.1111/j.1365-2427.2006.01637.x

Abstract

1. The potential for seed dispersal by fish (ichthyochory) will vary among aquatic plants because of differences in seed size and morphology. 2. To examine how seed morphology influences the probability of dispersal by the common carp (Cyprinus carpio), we studied seed ingestion, retention time and subsequent egestion and germination of seeds of Sparganium emersum and Sagittaria sagittifolia, two aquatic plant species with similar sized but morphologically different seeds. 3. We compared dispersal probabilities between the two plant species, in which the probability of dispersal is assumed to be a function of the probabilities of seed ingestion, egestion and germination, and the dispersal distance is assumed to be a function of seed egestion rate over time. 4. We found that, although the soft seeds of S. sagittifolia had an approximately 1.5 times higher probability of being ingested by the carp than the hard seeds of S. emersum (83.15% ± 1.8% versus 56.16% ± 2.7%, respectively), the latter had an almost twofold higher probability of surviving the passage through the digestive tract (38.58% ± 2.7% versus 20.97% ± 1.5%, respectively). Patterns of seed egestion over time did not differ between the two plant species, despite the difference in seed mor 5. Our results suggest that seed morphology affects the dispersal probability and postdispersal establishment, but not the dispersal distance, of aquatic plants that are dispersed by fish. [KEYWORDS: endozoochory ; gut passage ; ichthyochory ; postdispersal establishment ; retention time]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:12010
Deposited On:23 Nov 2011 01:00
Last Modified:31 Mar 2014 10:54

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