Marine Mollusca of the last 2 million years in New Zealand. Part 5. Summary

作者：Beu A G^*

来源：Journal of the Royal Society of New Zealand, 2012, 42(1): 1-47.

DOI：10.1080/03036758.2011.559727

• biogeography
• biostratigraphy
• dispersal
• evolution
• extinction
• migration
• planktotrophic larvae
• rafting
• speciation
• temperature change

Evolution occurred equally through allopatric speciation and anagenesis during Pliocene-Early Pleistocene time. However, no anagenesis is observed in Castlecliffian to Recent Mollusca. Possible explanations include (1) increasing shallowness and energy of the environment (Sheldon's 'plus ca change' model); (2) lecithotrophs increased with falling temperatures, and are more susceptible than planktotrophs to allopatric speciation; (3) 'plus ca change' implies that anagenesis continued unabated, but unrecorded, offshore from the recorded Pleistocene fauna. Three lineages (Pelicaria vermis, Stiracolpus symmetricus, Aoteadrillia wanganuiensis) became highly variable as a result of their changed developmental mode. Origination continued throughout Castlecliffian-Haweran time at a background rate of 0-2 new species per oxygen isotope stage (OIS), whereas extinction and range extensions of warm-water taxa to Wanganui Basin both reached a peak in OIS 9-7. However, the faunal record results from the interplay of temperature change and the preservation of different depositional environments. Biostratigraphy and temperature change also are reviewed.

• 出版日期2012