Palaeoecology of Late Glacial and Holocene profundal Ostracoda of pre-Alpine lake Mondsee (Austria) — A base for further (palaeo-)biological research
Palaeoecology of Late Glacial and Holocene profundal Ostracoda of pre-Alpine lake Mondsee (Austria) — A base for further (palaeo-)biological research
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DOI：
10.1016/j.palaeo.2014.09.009
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发表时间：
2015-02
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通讯作者：
T. Namiotko;D. Danielopol;U. Grafenstein;S. Lauterbach;A. Brauer;N. Andersen;Matthias Hüls;K. Milecka;Á. Baltanás;W. Geiger;DecLakes participants
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作者：
T. Namiotko;D. Danielopol;U. Grafenstein;S. Lauterbach;A. Brauer;N. Andersen;Matthias Hüls;K. Milecka;Á. Baltanás;W. Geiger;DecLakes participants
本文研究了奥地利蒙兹湖（Mondsee）前阿尔卑斯湖沉积物序列中介形类古组合对晚冰期和全新世环境变化的响应。第一个局部介形类组合带LOAZ-1（15，700 aBP之前），低丰度的Leucocytheremirabilis和Limnocytherina sanctipatricii，其次是Cytherissa lacustris，对应于相对高速率的碎屑-碎屑沉积的Pleniglacial阶段。LOAZ-2（15，590 ~ 13，940 a BP，包括盛冰期-晚冰期过渡期）的主要种，如湖沼花介、蚕豆（Fabaeformiscandonacf. harmsanxi）、蚕豆（F. tricatricosa、三疣隐翅虫C. lacustrisandCandonacandida，揭示了高铝含量和低沉积速率的显着关联，并被归类为更喜欢低生产力的条件。相比之下，在LOAZ-3中占优势的Candona neglecta（13，820 - 9960 aBP，孢粉学定义为Bölling-Early Holocene）和最后一个LOAZ-4（9780 a BP至今）以及眼海萤Cypria ophtalmica（LOAZ-4中的第二个关键物种）显示与较高的生产力、升高的沉积速率和降低的Al含量有关。研究了A-3级灰斑潜蝇（Candona neglecta）幼体在不同时间段的生物降解、形态差异及其与沉积速率变化的关系。最高比例的阀门生物降解放线菌记录在Allerød，新仙女木和全新世早期，当最低的沉积速率发生，而显着较低的频率记录在全新世中期和全新世晚期，沉积物积累高得多的生物降解阀门。并推测阀形变化的程度与湖泊生产力有关。在Allerød，新仙女木和全新世早期的阀门形状的变化显着低于记录在晚全新世的间隔，其特点是加强湖泊生产力，观察。此外，潜在的问题和方法，应考虑和形成进一步的（古）生物研究项目的核心议程。
Succession of profundal ostracod palaeoassemblages in response to environmental changes during the Late Glacial and Holocene was studied in a ~ 15-m-long sediment sequence from pre-Alpine lake Mondsee (Austria). First local ostracod assemblage zone LOAZ-1 (prior to 15,700 a BP), with low abundances ofLeucocytheremirabilisandLimnocytherina sanctipatriciifollowed byCytherissa lacustris, corresponds to the Pleniglacial phase of clastic-detrital sedimentation at relatively high rates. Most of the key species of LOAZ-2 (15,590 to 13,940 a BP, including the Pleniglacial–Late Glacial transition), i.e. limnocytherids,Fabaeformiscandonacf.harmsworthi,F. tricicatricosa,C. lacustrisandCandona candida, reveal the significant association with high Al contents and low sedimentation rates and are classified as preferring low-productivity conditions. In contrast,Candona neglecta, dominant in LOAZ-3 (13,820 to 9960 a BP, palynologically defined as Bölling–Early Holocene) and in the last LOAZ-4 (9780 a BP to present) as well asCypria ophtalmica(second key species in LOAZ-4) show relationship with higher productivity, elevated sedimentation rates and decreasing Al contents.Furthermore, valve biodegradation and shape disparity at different time periods and in relation to sedimentation rate changes were investigated in A-3 juveniles ofCandona neglecta. The highest percentage of valves biodegraded by Actinobacteria was recorded during the Allerød, Younger Dryas and Early Holocene, when the lowest sedimentation rates occurred, whereas significantly lower frequencies of biodegraded valves were recorded during the mid-Holocene and Late Holocene, when sediment accumulation was much higher. It is also hypothesised that the degree of the valve shape variation was related to the lake productivity. During the Allerød, Younger Dryas and Early Holocene a valve shape variation significantly lower than that recorded during Late Holocene intervals, characterised by intensified lake productivity, was observed. Additionally, an agenda of potential questions and approaches that should be considered and form the core of further (palaeo-)biological research projects is offered.