caa a22 4500 445893478 CHVBK 20180317145624.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10750-010-0544-9 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0544-9 Size matters: importance of penis length variation on reproduction studies and imposex monitoring in Bolinus brandaris (Gastropoda: Muricidae) [Elektronische Daten] [Paulo Vasconcelos, Paula Moura, Carlos Barroso, Miguel Gaspar] The present study aimed at analysing the monthly variation in penis length (PL) during the reproductive cycle of the purple dye murex (Bolinus brandaris). Two hypotheses were tested: PL variation reflects male maturation and reproductive activity; PL variation bias the calculation of imposex indices based on penis measurement (RPLI and RPSI). Sampling was performed during 1year in a population from Ria Formosa lagoon (Algarve coast, southern Portugal) with high incidence of imposex. Penis-bearing individuals were measured for shell length (SL) and PL, and two bio-physiological indices were calculated for both sexes, the general condition index (K) and the gonadosomatic index (GSI). PL presented monthly variation in both sexes, but while female PL showed small and random oscillation, male PL exhibited significant variation throughout the reproductive cycle (as evidenced by the similar and synchronous trends between male PL and GSI). These findings have implications both for reproduction studies and imposex monitoring: calculation of standardised PL (PL/SL) allows for gender identification without killing the organism and constitutes a useful penial index for assessing male maturation and reproductive activity; RPLI and RPSI should be applied cautiously in spatial and temporal comparisons of imposex severity in B. brandaris. Springer Science+Business Media B.V., 2010 Purple dye murex nationallicence Bolinus brandaris nationallicence Muricidae nationallicence Penis length variation nationallicence Reproductive cycle nationallicence Imposex nationallicence Vasconcelos Paulo Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305, Olhão, Portugal aut Moura Paula Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305, Olhão, Portugal aut Barroso Carlos Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Gaspar Miguel Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305, Olhão, Portugal aut Hydrobiologia Springer Netherlands 661/1(2011-02-01), 363-375 0018-8158 661:1<363 2011 661 10750 https://doi.org/10.1007/s10750-010-0544-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0544-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vasconcelos Paulo Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305, Olhão, Portugal aut NATIONALLICENCE 700 1- Moura Paula Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305, Olhão, Portugal aut NATIONALLICENCE 700 1- Barroso Carlos Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 700 1- Gaspar Miguel Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Avenida 5 de Outubro s/n, 8700-305, Olhão, Portugal aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 661/1(2011-02-01), 363-375 0018-8158 661:1<363 2011 661 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer