Distribution patterns of intertidal oribatid mites (Acari, Oribatida) from South African shores and their relationship to temperature

IF 1.4 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY African Journal of Marine Science Pub Date : 2021-04-03 DOI:10.2989/1814232X.2021.1912825
T. Pfingstl, J. Baumann, J. Neethling, I. Bardel-Kahr, EA Hugo-Coetzee
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引用次数: 3

Abstract

A faunistic study of the intertidal oribatid mite fauna of South Africa’s coastline revealed the presence of four species from three families, showing specific biogeographic patterns. Their occurrences show a clear east–west divide, with a small gap near East London between the Podacaridae and the other two families, the Selenoribatidae and Fortuyniidae, clearly coinciding with suggested marine biogeographic ecoregions. The podacarid Halozetes capensis is confined to the cooler warm-temperate Agulhas Ecoregion; the fortuyniid Fortuynia elamellata micromorpha and the selenoribatid Schusteria ugraseni to the warmer subtropical Natal Ecoregion; and the selenoribatid Selenoribates divergens to the tropical Delagoa Ecoregion. These distributions are an indication that the oceanic climate may be the primary factor shaping their biogeography, particularly the seawater temperatures along the coast, which are in turn affected by the Agulhas and the Benguela currents. A mean monthly sea surface temperature of approximately 22 °C apparently represents the climatic border of the distributions, with the podacarid persisting only below this temperature, and the fortuyniid and selenoribatids only above it. Global warming will certainly change these geographic ranges, and in South Africa the warm-adapted fortuyniid and selenoribatids can be expected to expand their distributions southwards, while the occurrence of the cold-adapted podacarid might be reduced to a few southwestern coastal areas in the next few decades.
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南非海岸潮间带甲螨(Acari, Oribatida)分布格局及其与温度的关系
一项对南非海岸线潮间带甲螨动物群的区系研究显示,存在三个科的四个物种,显示出特定的生物地理模式。它们的出现显示出明显的东西分界线,在东伦敦附近,足螨科和其他两个科,Selenoribatidae和Fortuynidae之间有一个小缺口,这显然与建议的海洋生物地理生态区相吻合。足螨Halozetes capensis局限于较冷的暖温带Agulhas生态区;在温暖的亚热带纳塔尔生态区发现了小形态Fortuynia elamellata和Selnoribatid Schusteria ugraseni;Selenoribates向热带Delagoa生态区分化。这些分布表明,海洋气候可能是影响其生物地理学的主要因素,特别是沿海的海水温度,而海水温度又受到Agulhas和Benguela洋流的影响。月平均海面温度约为22°C显然代表了分布的气候边界,足螨类仅在该温度以下持续存在,fortuyniid和selenoribatid类仅在其以上。全球变暖肯定会改变这些地理范围,在南非,适应温暖的fortuyniid和selenoribatid预计将向南扩展分布,而适应寒冷的足螨类的出现可能在未来几十年内减少到西南沿海的几个地区。
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来源期刊
African Journal of Marine Science
African Journal of Marine Science 生物-海洋与淡水生物学
CiteScore
2.60
自引率
16.70%
发文量
17
审稿时长
6-12 weeks
期刊介绍: The African (formerly South African) Journal of Marine Science provides an international forum for the publication of original scientific contributions or critical reviews, involving oceanic, shelf or estuarine waters, inclusive of oceanography, studies of organisms and their habitats, and aquaculture. Papers on the conservation and management of living resources, relevant social science and governance, or new techniques, are all welcomed, as are those that integrate different disciplines. Priority will be given to rigorous, question-driven research, rather than descriptive research. Contributions from African waters, including the Southern Ocean, are particularly encouraged, although not to the exclusion of those from elsewhere that have relevance to the African context. Submissions may take the form of a paper or a short communication. The journal aims to achieve a balanced representation of subject areas but also publishes proceedings of symposia in dedicated issues, as well as guest-edited suites on thematic topics in regular issues.
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