Freshwater Reviews, Vol 6, No 2 (2013)


Colin Reynolds
DOI: 10.1608/FRJ-6.2.654 | Pages: iii


Welcome to another edition of Freshwater Reviews, the concluding part of Volume 6.  The submission of copy has picked up a little over the past few months and we have been able to turn around three attractive and informative contributions in time to fulfil our publishing targets.  The first paper this time comes from the group at the Environmental Change Centre, UCL, under the lead authorship of Emma Wiik.  The group provides a literature-rich account on the susceptibility of marl lakes to eutrophication, examining in particular the popular supposition that marl lakes are well-defended against the effects of phosphorus loading through its co-precipitation with calcite.  A careful examination of the chemical transformations challenges the long-term effectiveness of phosphorus removal and binding capacity, particularly in shallow sediments.  The review finds evidence of symptoms of slow enrichment and of floristic changes, consistent with increased sensitivity, not less, to insidious eutrophication.
Next comes an intriguing critique of biogeochemical lake-modelling approaches, the data they require and the veracity of their outputs.  Anita Pätynen and her colleagues at the Finnish Environment Institute have considerable experience of applying various statistical models (Bayesian, Structural Dynamic) to water quality. In this paper, they used a collection of published studies to compare the outcomes of two favoured types of model approaches, viz., Linear Mixed Modelling (LMM) and Structural Equation Modelling (SEM), although I noted that neither is much cited outside in journals devoted to ecological and in environmental modeling; they are not much featured in more general aquatic and limnological publications.  Yet the authors find that LMM is particularly useful in analysing nested or hierarchical data.  SEM owes its logic to Bayesian theory and is well adapted to picking up outside influences and resolving pattern.  It is good that this work is continuing and, through publications such as this one, is likely to encourage greater general use in future data interpretations.
To introduce our third paper gives me great pleasure.  I met José and Takako Tundisi in 1981, when they introduced me to their (then quite new) project at the Lobo-Broa reservoir.  They went on to initiate studies at so many fine limnological sites in Brazil, and to inspire a succession of excellent research students, now well into a third or fourth generation.  I am delighted to receive their contribution to Freshwater Reviews and that it is focused on the site where it all began for them.  It is, in any case, a very interesting limnological location; this paper illustrates the value of long-term studies.
Once again, I am pleased to acknowledge the work of the referees and of my editorial colleagues at Windermere.  Louise Lavictoire has assisted from the start but she is presently on maternity leave.  She gave birth to a baby boy, Samuel Isaac, on 2 September last.  Both are flourishing!  
It is a pleasure to welcome Rosalind Maberly to the team – she has made an excellent job of this edition!