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Spawning behaviour of Arctic charr ( Salvelinus alpinus ): risk of sperm competition and timing of milt release for sneaker and dominant males V. Sørum , L. Figenschou , G. Rudolfsen & I. Folstad 1) (Faculty of Bio-science, Fishery and Economy, University of Tromsø, N-9037 Tromsø, Norway

In: Behaviour

Self-grooming by male meadow voles differs across copulation but is not affected by the risk and intensity of sperm competition Ashlee A. Vaughn 1,3) , Javier delBarco-Trillo 2) & Michael H. Ferkin 1) ( 1 Department of Biology, The University of Memphis, Ellington Hall, Memphis, TN 38152, USA

In: Behaviour

1. Introduction Sperm competition, competition between the sperm of two or more males for the fertilisation of ova, is an important mechanism of sexual selection that has shaped the evolution of mating systems (Parker, 1990 ; Andersson, 1994 ). Sperm competition is a form of

In: Behaviour

GENETIC DETERMINATION OF PATERNITY IN CAPTIVE GREY MOUSE LEMURS: PRE-COPULATORY SEXUAL COMPETITION RATHER THAN SPERM COMPETITION IN A NOCTURNAL PROSIMIAN? by MARJORIE ANDRÈS 1) , HÉLÈNE GACHOT-NEVEU 2) and MARTINE PERRET 1,3,4) ( 1 CNRS UMR 8571, Laboratoire d’Ecologie Générale, 4 avenue du

In: Behaviour

monogamous species. Sperm competition favours the evolution of larger ejaculates in many animals – they give bigger testes. In the view, we presented data on relative testis mass for 17 Chinese species including 3 polyandrous species. We analyzed relative testis mass within the Chinese data set and combining

In: Animal Biology

. We argue that these consequences of internal fertilization and gestation are responsible for many phenomena in humans, such as sexual coercion, commitment skepticism, sexual overperception, and a host of adaptations associated with sperm competition. © Koninklijke Brill NV, Leiden, 2009. Keywords

In: Animal Biology

THE FREQUENCY AND TIMING OF COURTSHIP AND COPULATION IN BLACKBIRDS, TURDUS MERULA, REFLECT SPERM COMPETITION AND SEXUAL CONFLICT by DARIUSZ WYSOCKI 1,2) and KONRAD HALUPKA 3,4,5) ( 1 Department of Vertebrate Anatomy and Zoology, University of Szczecin, ul. Waska 13, 71-412 Szczecin, Poland; 3

In: Behaviour

BEHAVIOURAL AND BREEDING-HABITAT RELATED ASPECTS OF SPERM COMPETITION IN RAZORBILLS by RICHARD H. WAGNER 1) (Department of Zoological Research, National Zoological Park, Smithsonian Institution, Washington, D.C. 20008-2598, U.S.A.) (With 4 Figures) Acc. 30-IX-1992) Summary I observed razorbill

In: Behaviour

MOLECULAR GENETIC ANALYSIS OF REMATING FREQUENCIES AND SPERM COMPETITION IN THE SCORPIONFLY PANORPA VULGARIS (IMHOFF AND LABRAM) by KLAUS PETER SAUER 1,2) , CONNY EPPLEN 3) , IRIS OVER 3) , THOMAS LUBJUHN 1) , AFRA SCHMIDT 1) , THOMAS GERKEN 1) and JÖRG THOMAS EPPLEN 3,4) ( 1 Institut für

In: Behaviour
Authors: Eberle, Peschke, Knaak, Benken, and Gack

order to quantify the outcome of sperm competition in the mating system of the rove beetle Aleochara curtula we performed three different mating experiment series. Paternity was establishedby DNA Ž ngerprintingwith oligonucleotideprobes. We found a precedence of the last male with a proportion of eggs

In: Behaviour