Maria Celeste Yuvero, Maria Eugenia Torroglosa, Betina J. Lomovasky, Juliana Gimenez
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引用次数: 0
Abstract
The size at first maturity of the bivalve Mytilus platensis d’Orbigny, 1842 was estimated in the intertidal population of Villa Gesell (37° 15'S; 56° 57'W), Buenos Aires, Argentina. We hypothesize a variation in population maturity associated with shell length (SL) and differences between females and males. Individuals were analyzed histologically, sexed (females and males), and classified as mature and immature. We carried out a Kernel Density Estimation (KDE) to allow us to visualize the distribution of the classifications based on the SL and used a Generalized Linear Model (GLM) to study the size at first sexual maturity for the population and between sexes. Our results showed immature specimens with reduced development in acini and expanded connective tissue. Mature males and females showed the acini expanded and filled with vitellogenic oocytes and spermatozoa, respectively. The size at first sexual maturity at which 50% of the population was mature (SL50) was 11.80 mm SL for all population, while SL50 was 11.42 mm in females and 10.83 mm in males. We determined significant interaction between SL and sex (p < 0.05). We conclude that the knowledge of the reproductive aspects in intertidal populations is essential for the development of a potential fishing resource.
在比耶斯尔(37°15'S)潮间带种群中测定了1842年双壳贝贻贝(Mytilus platensis d 'Orbigny, 1842)初成熟时的大小;西经56°57′,阿根廷布宜诺斯艾利斯。我们假设种群成熟度的变化与壳长(SL)和雌雄之间的差异有关。对个体进行组织学、性别(雌性和雄性)分析,并将其分为成熟和不成熟。我们进行了核密度估计(KDE),使我们能够可视化基于SL的分类分布,并使用广义线性模型(GLM)来研究群体和性别之间的初次性成熟大小。我们的结果显示,未成熟标本的腺泡发育减少,结缔组织扩大。成熟雄性和雌性的腺泡分别扩大,充满卵黄细胞和精子。50%种群成熟时的初次性成熟尺寸(SL50)为11.80 mm SL,而雌性SL50为11.42 mm,雄性SL50为10.83 mm。我们发现SL和性别之间存在显著的相互作用(p <0.05)。我们的结论是,了解潮间带种群的生殖方面的知识对于开发潜在的渔业资源是必不可少的。
期刊介绍:
Published since 1929, the Canadian Journal of Zoology is a monthly journal that reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.