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首页> 外文期刊>Environmental research >Age and seasonal variation in testis and baculum morphology in East Greenland polar bears (Ursus maritimus) in relation to high concentrations of persistent organic pollutants
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Age and seasonal variation in testis and baculum morphology in East Greenland polar bears (Ursus maritimus) in relation to high concentrations of persistent organic pollutants

机译：与高浓度持久性有机污染物有关的东格陵兰北极熊（Ursus maritimus）睾丸和杆状形态的年龄和季节性变化

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摘要

Persistent organic pollutants (POPs) are found in high concentrations in the Artic. Polar bears (Ursus maritimus) are one of the most exposed mammals in the Arctic and are thereby vulnerable to reproductive disruption. The aim of this study was to investigate male polar bear reproduction based on a detailed evaluation of testis histology and to assess possible effects of environmental chemicals on male polar bear reproduction. Reproductive groups that were identified based on histology were as follows: actively reproductive (REP), non-reproductive either with degenerated testes (DEG), undeveloped seminiferous tubules (UND), or morphology in-transition (INT). Categorization into these groups was supported by significant differences in testis and baculum measurements among REP, DEG, and UND, as well as differences in the area and diameter of seminiferous tubules among REP, DEG, and UND. These results show that it is possible to identify the reproductive stage in polar bears even if capture date and or age is lacking. Based on testis morphology we suggest that adult male polar bears from East Greenland have active spermatogenesis in February to June, and inactive degenerated testes in August to January. January to February was the main period of reproductive transition, characterised by a shift between inactive and active spermatogenesis. Baculum and testis size measurements decreased significantly with increasing concentrations of the chlordane metabolite oxychlordane, suggesting a potential impact on male reproductive success. Half of the investigated polar bears in REP group displayed signs of disorganization of the spermatogenesis which might be a sign of disrupted reproduction. However, no correlations with levels of the investigated POPs were detected. Reproductive organ measurements in polar bears differed significantly between REP and DEG groups, which cannot be explained by age, and therefore should be considered when investigating the effect of POPs on male reproduction.
机译：北极地区的持久性有机污染物（POPs）浓度很高。北极熊（Ursus maritimus）是北极地区最易被感染的哺乳动物之一，因此很容易受到生殖破坏的影响。这项研究的目的是基于对睾丸组织学的详细评估，研究雄性北极熊的繁殖，并评估环境化学物质对雄性北极熊繁殖的可能影响。根据组织学确定的生殖组如下：主动生殖（REP），退化性睾丸（DEG）非生殖，未发育的生精小管（UND）或形态转变（INT）。 REP，DEG和UND之间睾丸和杆状体测量值的显着差异以及REP，DEG和UND之间的生精小管的面积和直径的差异支持了对这些组的分类。这些结果表明，即使缺乏捕获日期和/或年龄，也可以确定北极熊的生殖阶段。根据睾丸形态，我们建议东格陵兰成年雄性北极熊在2月至6月具有活跃的精子发生能力，而在8月至1月具有失活的退化睾丸。一月至二月是生殖过渡的主要时期，其特征是非活跃和活跃的精子发生之间的转换。杆状杆菌和睾丸的尺寸测量值随着氯丹代谢产物氧氯丹浓度的增加而显着降低，表明对男性生殖成功有潜在的影响。 REP组中一半被调查的北极熊表现出精子发生紊乱的迹象，这可能是生殖受到干扰的迹象。但是，未发现与所调查的持久性有机污染物含量相关。 REP和DEG组之间，北极熊的生殖器官测量值存在显着差异，无法用年龄来解释，因此在调查POPs对雄性生殖的影响时应予以考虑。

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  • 来源
    《Environmental research》 |2019年第6期|246-254|共9页
  • 作者

    Sporndly-Nees Ellinor; Holm Lena; van Beest Floris M.; Fakhrzadeh Azadeh; Ekstedt Elisabeth; Letcher Robert; Magnusson Ulf; Desforges Jean-Pierre; Dietz Rune; Sonne Christian;

  • 作者单位

    Swedish Univ Agr Sci, Dept Anat Physiol & Biochem, Box 7011, S-75007 Uppsala, Sweden;

    Swedish Univ Agr Sci, Dept Anat Physiol & Biochem, Box 7011, S-75007 Uppsala, Sweden;

    Aarhus Univ, Dept Biosci, ARC, Frederiksborgvej 399,POB 358, DK-400 Roskilde, Denmark;

    Iranian Res Inst Informat Sci & Technol IranDoc T, 1090 Enghelab, Tehran, Iran;

    Swedish Univ Agr Sci, Dept Anat Physiol & Biochem, Box 7011, S-75007 Uppsala, Sweden;

    Carleton Univ, Wildlife & Landscape Sci Directorate, Environm & Climate Change Canada, Natl Wildlife Res Ctr, Bldg 33,1125 Colonel By Dr, Ottawa, ON K1A 0H3, Canada;

    Swedish Univ Agr Sci, Dept Clin Sci, Fac Vet Med & Anim Sci, Uppsala, Sweden;

    Aarhus Univ, Dept Biosci, ARC, Frederiksborgvej 399,POB 358, DK-400 Roskilde, Denmark;

    Aarhus Univ, Dept Biosci, ARC, Frederiksborgvej 399,POB 358, DK-400 Roskilde, Denmark;

    Aarhus Univ, Dept Biosci, ARC, Frederiksborgvej 399,POB 358, DK-400 Roskilde, Denmark;

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  • 正文语种 eng
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  • 关键词

    Reproduction; Bioaccumulative toxicants; Top predators; Ecotoxicology; Spermatogenesis;

    机译：生殖;生物蓄积性毒物;捕食者;生态毒理学;生精;

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