Genetic variation and demographic history of the Haplochromis laparogramma group of Lake Victoria-An analysis based on SINEs and mitochondrial DNA

More than 500 endemic haplochromine cichlid species inhabit Lake Victoria. This striking species diversity is a classical example of recent explosive adaptive radiation thought to have happened within the last similar to 15,000 years. In this study, we examined the population structure and historical demography of 3 pelagic haplochromine cichlid species that resemble in morphology and have similar niche, Haplochromis (Yssichromis) laparogramma, Haplochromis (Y.) pyrrhocephalus, and Haplochromis (Y.) sp. "glaucocephalus". We investigated the sequences of the mitochondrial DNA control region and the insertion patterns of short interspersed elements (SINEs) of 759 individuals. We show that sympatric forms are genetically differentiated in 4 of 6 cases, but we also found apparent weakening of the genetic differentiation in areas with turbid water. We estimated the timings of population expansion and species divergence to coincide with the refilling of the lake at the Pleistocene/Holocene boundary. We also found that estimates can be altered significantly by the choice of the shape of the molecular clock. If we employ the nonlinear clock model of evolutionary rates in which the rates are higher towards the recent, the population expansion was dated at around the event of desiccation of the lake ca. 17,000 YBP. Thus, we succeeded in clarifying the species and population structure of closely related Lake Victoria cichlids and in showing the importance of applying appropriate clock calibrations in elucidating recent evolutionary events. (C) 2009 Elsevier B.V. All rights reserved.

Skehill, Caroline: History of the Present of Child Protection and Welfare Social Work in Ireland

This unique book has at least three significant strengths. First, it offers an interesting angle on Irish social history and how social work and child protection and welfare services have been developed from the 1860s to the 1990s. Secondly, the author uses the 'history of the present' method of Michel Foucault in a promising manner, incorporating his concepts of archaeology, genealogy and discourse. Most of all she has succeeded in further developing Michel Foucault's concepts and strategies of writing. Although this is a national history, she has made a remarkable contribution to social work research. Her conceptual and methodological innovations are undoubtedly fully applicable to other social and societal contexts. This book is recommendable to those who want to implement genealogical analysis in their own research. Thirdly, her skill in writing and the way she renders the difficult language and concepts of Michel Foucault accessible means that here is a book that can also be read with ease by those whose mother tongue is not English. From the viewpoint of women and women's research the focus in this book is minor but if you are interested in social work history and genealogical analysis, this is a book you have to read!