Ovarian development in Argentinean shortfin squid Illex argentinus: group-synchrony for corroboration of intermittent spawning strategy

Modern living cephalopod species have evolved a wide phenotypic diversity and flexibility of reproductive strategies, which is closely linked to the pattern of oogenesis and oocytes ovulation of species. Although it has been suggested that Argentinean shortfin squid Illex argentinus lay eggs intermi...

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Veröffentlicht in:Hydrobiologia 2017-07, Vol.795 (1), p.327-339
Hauptverfasser: Lin, Dongming, Chen, Xinjun, Chen, Yong, Zhu, Guoping, Yan, Jizhou
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Chen, Yong
Zhu, Guoping
Yan, Jizhou
description Modern living cephalopod species have evolved a wide phenotypic diversity and flexibility of reproductive strategies, which is closely linked to the pattern of oogenesis and oocytes ovulation of species. Although it has been suggested that Argentinean shortfin squid Illex argentinus lay eggs intermittently, there is still little evidence for the mode of oocyte production and development. In this study, the ovarian development of I. argentinus was investigated by using histological analysis of ovaries, and six distinct histological stages of ovarian development were found among the ovaries. For each histological stage of the ovary, the frequency distribution of both number and occupied areas by each oogenesis stage was unimodal, and that gradually progressed along with ovarian development. The oocyte size distribution in ovaries before reaching vitellogenic stage was unimodal, bimodal in vitellogenic ovaries, and polymodal in ripe and partially spent ovaries. This evidence indicates that I. argentinus undergoes group-synchronous ovarian development, with a single dominant oocyte stock being produced to develop in several batches for a multiple-batch group-synchronous ovulation and confirms the intermittent spawning strategy of this species.
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source Springer Nature - Complete Springer Journals
subjects Biodiversity
Biological evolution
Biomedical and Life Sciences
Developmental stages
Ecology
Eggs
Fisheries
Flexibility
Frequency distribution
Freshwater & Marine Ecology
Group dynamics
Laboratories
Life Sciences
Marine molluscs
Oocytes
Oogenesis
Ovaries
Ovulation
Primary Research Paper
Size distribution
Spawning
Species
Squid
Zoology
title Ovarian development in Argentinean shortfin squid Illex argentinus: group-synchrony for corroboration of intermittent spawning strategy
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