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首页> 外文期刊>Polar biology >Reproductive biology of the ascidians Styela rustica and Halocynthia pyriformis from Kongsfjorden, Svalbard, Arctic
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Reproductive biology of the ascidians Styela rustica and Halocynthia pyriformis from Kongsfjorden, Svalbard, Arctic

机译：北极斯瓦尔巴特群岛Kongsfjorden的海生Styela Rusta和Halocynthia pyriformis的生殖生物学

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摘要

Ascidians are abundant and well-represented members of worldwide benthic communities, including Antarctica and the Arctic. These organisms exhibit different reproductive patterns usually related to a latitudinal gradient, as do many marine invertebrate species. Reproductive seasonality varies from one or two annual peaks in cold and temperate water species to continuous reproduction throughout the year in warm water species. Styela rustica (Linnaeus 1767) and Halocynthia pyriformis (Rathke 1806) are solitary species with external fertilization and a wide distribution range, from the North Atlantic to the Arctic. The reproductive patterns of these two species were assessed for Arctic populations by year-round sampling and structural analysis of the gonads. Both species are hermaphrodites and showed marked seasonality in oocyte maturity and spawning; S. rustica peaked during the boreal summer and H. pyriformis in late spring. The two species also showed marked differences in mature oocyte sizes: H. pyriformis almost doubled those of S. rustica and, while spermatocytes of H. pyriformis were mature year-round, the maturity of male and female gametes was synchronized in S. rustica. The species thus showed an annual reproductive cycle coupled with a higher production period in the ecosystem, but also exhibited different strategies developed under the same environmental pressures.
机译：海豚是包括南极洲和北极在内的世界底栖生物群落的丰富而有代表性的成员。与许多海洋无脊椎动物物种一样，这些生物表现出通常与纬度梯度有关的不同繁殖方式。繁殖季节从冷温带水种的一到两个年度高峰到温暖水域的一整年的连续繁殖。从北部大西洋到北极，斯蒂纳斯泰拉（Linnaeus，1767年）和梨形梭菌（Rathke，1806年）是具有外部受精作用且分布范围较广的单生物种。通过对性腺的全年取样和结构分析，评估了这两个物种的繁殖方式是否为北极种群。两种物种都是雌雄同体，卵母细胞的成熟和产卵表现出明显的季节性。质朴链霉菌在北方夏季盛行，而在春季则是梨形支原体。这两个物种在成熟卵母细胞大小上也显示出显着差异：拟南芥几乎是原来的两倍，而拟南芥的精母细胞全年都在成熟，而雌性配子的成熟是在土气里同步的。因此，该物种在生态系统中显示出每年的繁殖周期和较高的生长期，但在相同的环境压力下也表现出不同的策略。

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  • 来源
    《Polar biology》 |2019年第10期|1899-1909|共11页
  • 作者

    Ferrero Luciana; Servetto Natalia; Laudien Juergen; Sahade Ricardo;

  • 作者单位

    Univ Nacl Cordoba Fac Ciencias Exactas Fis & Nat Ecol Marina Cordoba Argentina;

    Univ Nacl Cordoba Fac Ciencias Exactas Fis & Nat Ecol Marina Cordoba Argentina|Consejo Nacl Invest Cient & Tecn IDEA Ecosistemas Marinos Polares Av Velez Sarsfield 299 X5000JJC Cordoba Argentina;

    Alfred Wegener Inst Helmholtz Ctr Polar & Marine Res AltenHafen 26 D-27568 Bremerhaven Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Polar ecosystems; Tunicates; Life cycles; Reproductive ecology;

    机译：极地生态系统;上衣;生命周期;生殖生态学;

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