© Koninklijke Brill NV, Leiden, 2009 DOI 10.1163/157075509X12499949744306 Animal Biology 59 (2009) 435–448 brill.nl/ab Reduced egg laying caused by a male accessory gland product opens the possibility for sexual conﬂ ict in a simultaneous hermaphrodite Joris M. Koene* , Annelies Brouwer , Jeroen N.A. Hoﬀ er Animal Ecology, Faculty of Earth and Life Sciences, VU University, De Boelelaan 1085, 1081 HV Amsterdam, Th e Netherlands Abstract Promiscuity, sperm storage and internal fertilization enhance sperm competition, which leads to sexual conﬂ ict whenever an advantageous trait for sperm donors is harmful to recipients. In separate-sex species, such conﬂ icts can severely impact the evolution of reproductive characteristics, physiology and behav- iours. For simultaneous hermaphrodites, the generality of this impact remains unclear and underlying mechanisms remain largely unexplored. In the hermaphrodite Lymnaea stagnalis several previous studies showed that investment in eggs diﬀ ers depending on semen receipt, but these were inconsistent about the direction of change. We investigated whether the change in egg laying is caused by a seminal ﬂ uid com- ponent. By intravaginally injecting animals, we here reveal that a component of the seminal ﬂ uid inhibits egg laying, thus providing the ﬁ rst direct evidence for involvement
Animal Biology – Brill
Published: Jan 1, 2009
Keywords: ALLOHORMONE; SEX PEPTIDE; INSEMINATION; SEMINAL FLUID; MOLLUSCA; PULMONATA; SNAIL
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