Assortative fertilization in Chlamys farreri and Patinopecten yessoensis and its implication in scallop hybridization

文献类型： 外文期刊

第一作者： Lu, Zhengming

作者： Lu, Zhengming;Yang, Aiguo;Wang, Qingyin;Liu, Zhihong;Zhou, Liqing

作者机构：

关键词： scallop;assortative fertilization;Chlamys farreri;Patinopecten yessoensis

期刊名称：JOURNAL OF SHELLFISH RESEARCH （ 影响因子：1.396； 五年影响因子：1.47 ）

ISSN： 0730-8000

年卷期： 2006 年 25 卷 2 期

页码：

收录情况： SCI

摘要： Assortative mating and reduced hybrid fitness are typically invoked to explain the stability of hybrid zones and the specification of two closely related taxa. Such examples of mate preferences in nature, especially for broadcast free-spawning marine invertebrates, and the understanding of the underlying mechanisms responsible for this positive selection are still lacking. This study documents another example of assortative fertilization by genome in situ hybridization in reciprocal crosses of scallops Chlanlysfarreri and Patinopecten yessoensis. Females produced eggs selected sperm nonrandomly but showed significant gamete preference of conspecifics over heterospecifics, with Chlamys farrei females using average 89.1% of conspecific sperms and the Patinopecten yessoensis using average 94.3% in natural spawning conditions (temperature 17 degrees C, salinity 31.5 parts per thousand). This conspecific gamete advantage may be related to the coordinated communication between interacting gametes, and the conspecific bindin genotype selection during the communicational process may also be involved. Two environmental factors, temperature and salinity were also tested to determinate to what extent they affect the patterns of assortative fertilization between these two species. The result showed that temperature seemed to have more influence on assortative fertilization than salinity did. At the temperatures of 11 degrees C, 17 degrees C, 22 degrees C and 26 degrees C, the average conspecific sperms preference of Chlamys farreri eggs was 80.0%, 89.1%, 95.1% and 95.5% respectively, whereas at the salinity of 24 parts per thousand, 28 parts per thousand, 31.5 parts per thousand and 35.5 parts per thousand, the average mating preference was 97.2%, 91.2%, 89.1% and 99.5% respectively. These results may have some bearings on the condition dependent alteration in the inter gamete recognition system. Alternatively, it may be simply the byproduct of different sperm tolerance ability under different conditions. The implication it may provide to hybrid production was also discussed.

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