Mass Occurrence of Penetrative Trace Fossils in Triassic Lake Deposits (Kyrgyzstan, Central Asia)
Mass Occurrence of Penetrative Trace Fossils in Triassic Lake Deposits (Kyrgyzstan, Central Asia)
复制标题
三叠纪湖沉积物中大量出现的渗透性痕迹化石（吉尔吉斯斯坦，中亚）
作者：
Bioturbation and the breakdown of organic detritus by burrowing macro-invertebrates are key factors for the energy flow in recent freshwater ecosystems due to the acceleration of nutrient cycling. According to the current state of knowledge, food webs similar to those of modern lakes were not operating until the Late Mesozoic, when a well-established freshwater infauna evolved. Here we describe laterally extended networks of irregularly branched burrows that constitute the most common ichnofossils in lacustrine deposits of the Middle to Late Triassic Madygen Formation, SW Kyrgyzstan. The shallow penetrative trace fossils give evidence that exploitation of lake-bottom sediments by benthic invertebrates was already in place in the Early Mesozoic. Architecture and size of the fossil burrows indicate deposit-feeding, worm-like trace makers of similar morphology and behavior to extant oligochaetes or aquatic insect larvae. Maximum intensity of bioturbation is recorded in mudstones of the transitional sublittoral to profundal lake zone, which usually represent the thermocline/chemocline level in modern stratified lakes. Taking into account the low-oxygen tolerance of many recent oligochaetes and insect larvae, we propose that ecospace utilization of deep-water lacustrine settings was originally impelled by two factors: the exploitation of additional food resources and the avoidance of predation by carnivorous animals from well-aerated lake zones. Spatial restriction of the described fossil traces could offer a basic approach to subdivide the Mermia ichnofacies.
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DOI：
10.1016/0031-0182(88)90068-5
发表时间：
1988
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
R. Wootton
通讯作者：
R. Wootton
影响因子：
1.4
作者：
PRITCHARD, G;LEISCHNER, TG
通讯作者：
LEISCHNER, TG
Vagorichnus，一种新的洞穴系统鱼类及其在华中侏罗纪湖相浊积岩中作为离散和复合鱼类的出现
DOI：
10.1080/10420949509386396
发表时间：
1995
影响因子：
0.8
作者：
L. Buatois;M. Mángano;Wu Xiantao;Z. Guocheng
通讯作者：
Z. Guocheng
越冬摇蚊开采氧气
DOI：
10.2110/palo.2006.p06-036r
发表时间：
2007
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
M. Gingras;Stefan V. Lalond;Larry Amskold;K. Konhauser
通讯作者：
K. Konhauser
密歇根州蒙莫朗西县亨特溪的蠓动物群（双翅目：Tendipedidae）生态学笔记
影响因子：
4.8
作者：
L. L. Curry
通讯作者：
L. L. Curry