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首页> 外文期刊>Facies >Holocene trends in distribution and diversity of benthic foraminifera assemblages in atoll lagoons, Belize, Central America
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Holocene trends in distribution and diversity of benthic foraminifera assemblages in atoll lagoons, Belize, Central America

机译：中美洲伯利兹环礁泻湖底栖有孔虫种群分布和多样性的全新世趋势

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摘要

Seven benthic foraminiferal assemblages were identiWed in vibracores through Holocene lagoons of three Belize atoll lagoons (Glovers Reef, Lighthouse Reef,TurneVe Islands). These include (1) the low-diversity Cribroelphidium assemblage (2) the Cribroelphidium-Elphidium assemblage (3) the Quinqueloculina-Triloculina-Peneroplis assemblage (4) the high-diversity miliolid assemblage (5) the Archaias-miliolid assemblage (6) the low-diversity miliolid assemblage, and (7) the mixed assemblage. Altogether, 109 species and 56 genera were identiWed. The highest diversities are observed in the largest lagoon (TurneVe Islands), whereas one of the smaller lagoons (Glovers Reef) exhibits the lowest diversities during the Holocene. No signiWcant changes in diversity over time occur, however, a slight trend to higher diversity may be observed through the Holocene, suggesting that the foraminiferal faunas in the atolls are in a diversiWcation stage.Faunal diversity in atoll lagoons appears to be controlled largely by habitat size, habitat heterogeneity, and water circulation.Habitat age and water depth only play minor roles. Substrate texture, water depth, and turbidity inXuence the predominant modes of life of benthic foraminifera encountered in the lagoons (epifaunal versus infaunal versus symbiont- bearing). Time-averaging eVects were not observed,even though lagoonal sedimentation rates Xuctuate in individual cores and the three lagoons, and despite the fact that sediments are modiWed through bioturbation by callianassid shrimps. This Wnding underlines the potential of benthic foraminifera for paleoecological studies in the fossil record of reefs and carbonate platforms.
机译：通过三个伯利兹环礁泻湖（格洛弗礁，灯塔礁，TurneVe群岛）的全新世泻湖在震颤中发现了七个底栖有孔虫组合。其中包括（1）低多样性的Cribroelphidium组合（2）Cribroelphidium-Elphidium组合（3）Quinqueloculina-Triloculina-Peneroplis组合（4）高多样性的miliolid组合（5）Archaias-miliolid组合（6）低多样性的miliolid组合，以及（7）混合组合。共鉴定出109种56属。在最大的泻湖（TurneVe群岛）中观察到最高的多样性，而在全新世期间，较小的泻湖之一（格洛弗礁）则表现出最低的多样性。随时间变化没有明显的多样性变化，但是，通过全新世可以观察到更高的多样性趋势，这表明环礁中的有孔虫动物群处于多样性阶段。大小，栖息地异质性和水循环。生境年龄和水深仅起较小作用。底物质地，水深和浊度影响了泻湖中底栖有孔虫的主要生活模式（足月，无脚，共生）。尽管泻湖的沉积速率在各个岩心和三个泻湖中都增加了，但仍未观察到时间平均效应，尽管事实证明，愈伤组织的虾通过生物扰动改变了沉积物。这项研究突显了底栖有孔虫在珊瑚礁和碳酸盐台地化石记录中的古生态研究潜力。

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