珠江三角洲平原螃蟹遗迹特征及其对古环境的指示意义*
Characteristics of modern crab traces in the Pearl River Delta Plain and their significance as indicators of palaeoenvironments
Crabs serve as ecological engineers capable of sensitively reflecting and modifying sedimentary and ecological environments in which they reside. The sedimentary environment of the Pearl River Delta Plain is highly complex,which is characterized by a diverse and abundant crab population. This paper focuses on investigating the distribution and compositional characteristics of different crab species within the region,as well as their significance in indicating paleoenvironments. A total of 92 sampling points in the Pearl River Delta Plain were established to collect water samples,soil samples,and biogenic submerged burrow cores. Observations and photographic documentation were conducted to record the distribution and characteristics of crab traces at each sampling point. Subsequently,sedimentary environments and crab traces within the study area were analyzed using methods such as salinity measurement,granulometric analysis,CT scanning,and three-dimensional reconstruction. Key findings include: (1)The predominant crab species identified were Orisarma dehaani and Orisarma sinense from the family Grapsidae,Grapsoidea,and Paraleptuca splendida from the family Ocypodidae,Ocypodoidea. Crab traces included tracks,fodinichnia,waste trails,and burrows,with most burrows exhibiting I-and J-shaped configurations and a few Y-shaped structures. (2)Crab traces were predominantly distributed in intertidal zones influenced by tides,with the highest abundance observed in estuarine areas,and relatively fewer traces in diversion channels and coastal wetlands. (3)Through analogy,it was determined that the morphological characteristics and depositional environments of crab traces resemble those of the trace fossil Psilonichnus,which is primarily found in shallow marine firmground environments. Additionally,trace phases associated with crab traces include Glossifungites,Psilonichnus,and Skolithos. This study contributes modern sedimentological data for the Pearl River Delta Plain,reveals the paleoenvironmental significance of crab traces,and provides critical evidence for geological and ecological research.
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*国家自然科学基金项目(42172130)
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