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Reproductive migrations of the sex role reversed pipefish Nerophis lumbriciformis(Pisces; Syngnathidae)

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Using an individual identification technique, a population of worm pipefish Nerophis lumbriciformis was followed during 19 months, in order to determine the exact use of the intertidal and, considering the specific movement patterns of males and females, the mating system exhibited by this population. Field observations showed that the number of adults increased during the breeding season, with males arriving 1 month earlier than females. Furthermore, males and females presented distinct permanence periods, showing that the intertidal is used as a mating arena. It was also observed that both male and female worm pipefish mated repeatedly over the span of a reproductive season, but females exhibited shorter remating intervals. Also, females stayed for longer periods on the mating grounds, the intertidal zone, whereas males typically left for the subtidal after mating, usually returning within 2 months. These inter‐sexual differences in the occupation of the intertidal suggest that females breed with different males but also that males accept eggs from various females since, on their return, a new group of mating partners was now available. Thus, N. lumbriciformis might be considered polygynandric. It is a clearly dimorphic species in spite of the observed polygynandry, suggesting that differences in remating intervals may be influential in determining the strength of sexual selection along with what may be expected from the polygynandrous mating system alone.
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Keywords: Nerophis lumbriciformis; Syngnathidae; mating system; polygynandry; potential reproductive rate

Document Type: Regular Paper

Affiliations: 1: CIIMAR, Rua dos Bragas 177, 4050-123 Porto, Portugal, 2: Department of Animal Ecology, Norbyv. 18d, Uppsala University, SE-752 36 Uppsala, Sweden and 3: Departamento de Zoologia e Antropologia da Faculdade de Ciências da Universidade do Porto, Praça Gomes Teixeira, 4099-002 Porto, Portugal, 4: ISPA, Rua Jardim do Tabaco 34, 1149-041 Lisboa, Portugal

Publication date: 2006-07-01

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