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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [31134]
Sexual reproductive success in Posidonia oceanica Balestri, E.; Cinelli, F. (2003). Sexual reproductive success in Posidonia oceanica. Aquat. Bot. 75(1): 21-32. http://dx.doi.org/10.1016/s0304-3770(02)00151-1 In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770; e-ISSN 1879-1522, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 56968 [ download pdf ]

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Trefwoorden

Aquatic organisms > Heterotrophic organisms > Herbivores Behaviour > Feeding behaviour > Grazing Disorders > Diseases > Functional disorders > Diseases > Reproductive disorders > Abortion Flora > Weeds > Marine organisms > Seaweeds > Sea grass Interspecific relationships > Predation Reproduction > Sexual reproduction Reproductive cycle Posidonia oceanica (Linnaeus) Delile, 1813 [WoRMS] MED, Italy, Tuscany, Livorno [Marine Regions] Marien/Kust

Author keywords

seagrasses; Posidonia oceanica; fruit abortion; fruit predation;reproductive success

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Auteurs		Top
Balestri, E., meer Cinelli, F.

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Abstract

To identify the factors that might contribute to limiting the sexual reproduction of Posidonia oceanica we examined: (1) flowering and fruiting phenology; (2) variability in flowering frequency, seed production and reproductive success (i.e. the proportion of flowers setting mature fruits per unit area) over a 2-year period; and (3) losses of potential seed production to fruit abortion and/or pre-dispersal seed predation. The flowering frequency of P. oceanica varied among years, ranging between 7.9 and 19.8%. Despite the large number of flowers and ovules, few of these produced mature fruits owing to abortion. Moreover, about 84% of developing inflorescences were damaged by herbivores. Fruit production varied among years, ranging from 4.7 to 13.5 fruits per m2, but reproductive success remained constant (2.0-2.4%). Exclusion of herbivores showed that abortion alone was reponsible for the loss of about 87% of the reproductive potential. Since reduced fertilization did not completely explain the observed frequency of abortion, it was hypothesized that post-fertilization factors could affect seed formation. The higher reproductive success of protected plants (11.2%) compared to herbivore-exposed plants (3.1%) indicated that predation significantly reduced the number of seeds available for establishment. We concluded that pre-dispersal seed losses to abortion and predation may seriously reduce the reproductive success of the species.

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