NDLI: Allochronic divergence and clonal succession: two microevolutionary processes sculpturing population structure of Brachionus rotifers

Content Provider	Springer Nature Link
Author	Papakostas, Spiros Michaloudi, Evangelia Triantafyllidis, Alexander Kappas, Ilias Abatzopoulos, Theodore J.
Copyright Year	2012
Abstract	The life cycle of cyclical parthenogens provides a unique model for the study of spatiotemporal microevolutionary processes at ecologically relevant time scales. Considerable effort has been invested to understand spatial population structure, but critical information is still missing on temporal population divergence. This study aims to provide insights toward the latter direction by investigating the year-round species and clonal variation patterns of the cyclical parthenogenetic rotifers of the genus Brachionus. For this, a nuclear SSR genetic assay with environmental measurements in sequential population samples from an inland lake (Lake Koronia, Greece) was used. Species assignment was based on a combination of mitochondrial RFLPs (COI, 16S rRNA) and phenotypic characters. Two species pairs succeeded each other, namely Brachionus plicatilis sensu stricto (s.s.)/B. sp. “Austria” and B. ibericus/B. dimidiatus. In B. plicatilis s.s., a strong positive and significant correlation between genetic divergence of temporal samples and time (r = 0.85, P < 0.05) was observed, resulting in high levels of population differentiation (F ST > 0.3). We also observed a progressive succession between two clonal groups of B. plicatilis s.s. There was further a marked discrimination of the abundance of cryptic species by temperature and an association between temperature and the abundance of the two B. plicatilis s.s. clonal groups was also noticed. Our results provide evidence for ecological specialization at both the inter- and the intraspecific levels. High allochronic population divergence within relatively short periods of time underlines the microevolutionary role of clonal selection behind these observations.
Starting Page	33
Ending Page	45
Page Count	13
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	700
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Brachionus plicatilis Clonal selection Cryptic species Microsatellite genotyping Restriction fragment length polymorphism Seasonal succession Freshwater & Marine Ecology Zoology Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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