Giant-toothed White Sharks and Wide-toothed Mako (Lamnidae) from the Venezuela Neogene: Their Role in the Caribbean, Shallow-water Fish Assemblage
Giant-toothed White Sharks and Wide-toothed Mako (Lamnidae) from the Venezuela Neogene: Their Role in the Caribbean, Shallow-water Fish Assemblage
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委内瑞拉新近纪巨齿白鲨和宽齿灰鲭鲨（Lamnidae）：它们在加勒比海浅水鱼类群落中的作用
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
D. R. D. Aguilera
中科院分区：
文献类型：
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作者：
O. Aguilera;D. R. D. Aguilera
基于从早中新世到晚上新世三个不同热带古环境中的捕食者 - 猎物关系，探讨了新近纪巨齿鼠鲨科鲨鱼在加勒比浅海鱼类群落中的作用。来自委内瑞拉新近纪沿海浅水区、沿海上升流区、沼泽地、沿海泻湖和砂质滨海区的已灭绝巨齿白鲨（噬人鲨属的巨齿鲨（阿加西）、亚关节噬人鲨（阿加西））以及宽齿鲭鲨（尖吻鲭鲨（阿加西））的新记录表明，这些物种是大型的洄游性食鱼动物，可能具有足够的行为灵活性以适应不同环境。巨齿鲨类物种可能主要以鱼类、海龟、鲸类和海牛类为食，但并没有呈现出庞大的种群数量。大型消费性鲨鱼所承担的营养作用代表了较高的营养层级、选择压力的类型以及在海洋环境中所施加的控制。新近纪期间这些关联的动态有很大差异。
The role of Neogene giant-toothed lamnid sharks in the Caribbean neritic fish assemblage is discussed based on predator-prey relationships in three different tropical paleoenvironments from the Lower Miocene to Lower Pliocene. New records of extinct giant-toothed white sharks Carcharodon megalodon (Agassiz), Carcharodon subarticulatus (Agassiz), and wide-toothed mako Isurus xiphodon (Agassiz) from coastal shallow waters, coastal upwelling, swampy, coastal lagoon, and sandy littorals of the Venezuela Neogene, suggest these species were large transient piscivores that may have had enough behavioral flex- ibility to occupy different environments. Giant-tooth shark species, that probably fed mainly on fish, turtles, cetaceans and sirenids, did not exhibit large population sizes. The trophic role that large consumer sharks have carried out represents the higher trophic category, the type of selective pressure, and the control performed in the marine environment. The dynamics of these associations during Neogene is deeply dif- ferent.