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The third way: spermcast mating in sessile marine invertebrates


Bishop, J D D; Pemberton, A J (2006). The third way: spermcast mating in sessile marine invertebrates. Integrative and Comparative Biology, 46(4):398-406.

Abstract

Marine invertebrates belonging to a broad range of taxa disperse aquatic spermatozoa to fertilize eggs that are retained rather than spawned. We outline the occurrence of this mechanism, which we refer to as spermcast mating, and identify tentative generalizations relating to it. Contrasts are drawn where appropriate with broadcast spawning of both eggs and sperm for external fertilization, and with copulation or pseudocopulation. Spermcast mating may involve the gradual accumulation of long-lived spermatozoa from dilute suspension, probably during suspension feeding, and the subsequent storage of spermatozoa by the recipient (acting female) prior to fertilization. This process may involve extensive contact between spermatozoa and recipient (maternal) tissue. Mating may be influenced by compatibility systems, and receipt of compatible allosperm may trigger female investment, giving apparent scope for sexual conflict over levels of maternal investment. External fertilization of cohesive egg masses remaining close to the acting female may appear somewhat intermediate between spermcast mating and broadcast spawning but, while it may be possible to envisage a continuum between the 2 modes, the end points are distinct, commonplace, and involve contrasting reproductive characteristics. Three variants of the typical pattern of spermcast mating are briefly discussed: the spawning of zygotes (rather than the more usual brooding of progeny), polyembryony, and the dispersal of spermatophores rather than individual spermatozoa

Abstract

Marine invertebrates belonging to a broad range of taxa disperse aquatic spermatozoa to fertilize eggs that are retained rather than spawned. We outline the occurrence of this mechanism, which we refer to as spermcast mating, and identify tentative generalizations relating to it. Contrasts are drawn where appropriate with broadcast spawning of both eggs and sperm for external fertilization, and with copulation or pseudocopulation. Spermcast mating may involve the gradual accumulation of long-lived spermatozoa from dilute suspension, probably during suspension feeding, and the subsequent storage of spermatozoa by the recipient (acting female) prior to fertilization. This process may involve extensive contact between spermatozoa and recipient (maternal) tissue. Mating may be influenced by compatibility systems, and receipt of compatible allosperm may trigger female investment, giving apparent scope for sexual conflict over levels of maternal investment. External fertilization of cohesive egg masses remaining close to the acting female may appear somewhat intermediate between spermcast mating and broadcast spawning but, while it may be possible to envisage a continuum between the 2 modes, the end points are distinct, commonplace, and involve contrasting reproductive characteristics. Three variants of the typical pattern of spermcast mating are briefly discussed: the spawning of zygotes (rather than the more usual brooding of progeny), polyembryony, and the dispersal of spermatophores rather than individual spermatozoa

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Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:5 May 2006
Deposited On:18 Oct 2018 14:07
Last Modified:17 Sep 2019 19:29
Publisher:Oxford University Press
ISSN:1540-7063
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1093/icb/icj037
Related URLs:https://www.swissbib.ch/Search/Results?lookfor=nationallicenceoxford101093icbicj037 (Library Catalogue)
PubMed ID:21672752

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