DOI: 10.1016/j.palaeo.2014.08.015
论文题名: Population bottleneck triggering millennial-scale morphospace shifts in endemic thermal-spring melanopsids
作者: Neubauer T.A. ; Harzhauser M. ; Georgopoulou E. ; Wrozyna C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 414 起始页码: 116
结束页码: 128
语种: 英语
英文关键词: Fast Fourier Transform
; Genetic drift
; Morphometric analysis
; Phenotypic evolution
; Stable isotopes
英文摘要: For more than hundred years the thermal spring-fed Lake Petea near Oradea, Romania, was studied for its highly endemic subfossil and recent fauna and flora. One point of focus was the species lineage of the melanopsid gastropod Microcolpia parreyssii, which exhibited a tremendous diversity of shapes during the earlier Holocene. As a consequence many new species, subspecies, and variety-names have been introduced over time, trying to categorize this overwhelming variability. In contrast to the varied subfossil assemblage, only a single phenotype is present today. We critically review the apparent "speciation event" implied by the taxonomy, based on the presently available information and new data from morphometric analyses of shell outlines and oxygen and carbon isotope data. This synthesis shows that one turning point in morphological evolution coincides with high accumulation of peaty deposits during a short time interval of maximally a few thousand years. The formation of a small, highly eutrophic swamp with increased input of organic matter marginalized the melanopsids and reduced population size. The presented data make natural selection as the dominating force unlikely but rather indicates genetic drift following a bottleneck effect induced by the environmental changes. This claim contrasts the "obvious trend" and shows that great morphological variability has to be carefully and objectively evaluated in order to allow sound interpretations of the underlying mechanisms. © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69212
Appears in Collections: 过去全球变化的重建
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作者单位: Geological-Paleontological Department, Natural History Museum Vienna, Burgring 7, Vienna, Austria; Institute for Earth Sciences (Geology and Paleontology), University of Graz, Heinrichstrasse 26, Graz, Austria
Recommended Citation:
Neubauer T.A.,Harzhauser M.,Georgopoulou E.,et al. Population bottleneck triggering millennial-scale morphospace shifts in endemic thermal-spring melanopsids[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,414