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• W2086540417 abstract "Keys to adults of the water beetles of Britain and Ireland (Part 1) by G. N. Foster and L. E. Friday , with colour plates by Jirí Hájek . 2011 . Handbooks for the identification of British insects . Vol. 4, part 5 (2nd Ed.) . Royal Entomological Society, St Albans and Field Studies Council, Shrewsbury, U.K. 148 pp. ISBN 978-0-901-54693-7 , softcover , GB £24.00 . This book is an updated and much improved version of the guide to British water beetles by Friday (1988). The present volume treats only the adephagan water beetles – known as the Hydradephaga – whereas polyphagan water beetles such as reed-, marsh-, riffle- and water scavenger (‘palpicorn’) beetles will be treated in a second part. The study of water beetles in the British Isles has a proud tradition after the work of Professor Frank Balfour-Browne (1874–1967) and is kept alive much thanks to the club named in his honour fostering new aquatic coleopterists, assisting conservation efforts and promoting recording schemes. The book has a short introduction and a checklist followed by identification keys and species texts group-by-group. It finishes with a distribution table, a reference list, a family-level key to aquatic Coleoptera, an index and, finally, 19 plates with colour photographs of all treated species. The language is kept simple with a minimum of specialised terminology and aimed at the nonspecialist. A few species have been granted vernacular names, but these appear random and a serious attempt to construct useful common names is still lacking. The introduction has a section about collecting methods that stresses the importance of avoiding unnecessary killing of untargeted groups by returning pond net-caught debris back to the water, of not leaving bottle traps out for too long and always removing them after use. This could have been complemented with advice to always leave an air supply in the set bottle trap, which significantly increases the probability of live trapping. The checklist follows Löbl & Smetana (2003) for Dytiscidae and Gyrinidae and Nilsson & van Vondel (2005) for Noteridae, Haliplidae and Paelobiidae with two later additions (e.g. the new name Boreonectes replacing Stictotarsus for multilineatus, but still referred to as S. multilineatus in the species text out of old habit). But there are deviations to this schema. Some more recent updates, especially regarding the year of publication, have been included [e.g. ‘Hydroporus planus (Fabricius, 1782)’ not 1781], whereas others have been left out [e.g. ‘Agabus labiatus (Brahm, 1791)’ although the first part of Brahm's Insektenkalender, which includes labiatus, is dated to 1790]. The most updated source for Dytiscidae names today is arguably ITIS (Integrated Taxonomic Information System, http://www.itis.gov/) that includes all updates, corrections and additions to the world catalogue of Dytiscidae (Nilsson, 2001) until 2011-01-01 (A. Nilsson, personal communication). The potential standpoint that e-publications or e-sources are not equivalent or as eligible to cite as paper publications is certainly coming of age. This is aimed at being a practical handbook useful for limnologists, hence identification keys are not built systematically and on characters used for classification alone when more user-friendly alternatives for a regional fauna exist. Another aspect of the user-friendly aspiration is the layout with black-and-white illustrations presented directly next to the relevant couplet in the key. The illustrations are in general of high quality and informative. The keys for the most difficult species within the Agabini and Hydroporus groups contain lateral and dorsal views of the male genitalia, respectively. A lateral view of Hydroporus genitalia would have been useful as well. Some brave and novel measures have been taken to facilitate identification, like using the colour of last antennal segment as an early nonsystematic divider in the species-rich Agabus + Ilybius key. A couple of errors that could be mentioned in the keys include Key 6 to genera of Dytiscidae, couplet 4 and figs 79–81, which can cause some confusion for beginners: fig. 81 has an arrow pointing to the base of the antenna instead of to the indentation of the eye and the alternative fig. 79 has the antenna inserted immediately next to labrum, which is incorrect. Also, the male front tarsus with suction cups illustrated in fig. 80 is an odd creation – originally a front foot of Dytiscus, which is keyed out earlier, a third large suction cup has been added creating a tarsus not found on any Dytiscidae. The distributions of species are presented in two ways. Towards the end, a distribution table is presented listing the occurrence of each species for Scotland, England, Wales, the Isle of Man, Northern Ireland, the Republic of Ireland and the Channel Isles. The occurrence data is divided into pre- and post-1980 records and the large proportion of recent records testify to the active state of water beetle faunistics in Britain and Ireland. Even subfossils are included, which is the only evidence that Ilybius wasastjernae ever existed in England. In addition, often half of the main text for each species is spent on occurrence data in more detail often on locality or county level. One could question whether this might not also have benefited from some kind of table format, although here the spatial information is intermingled with temporal trends and sequence of discovery as well as with habitat information. The photographs prepared by Jirí Hájek on colour plates are in general excellent but are, except for a few, reproduced from the Icones Insectorum Europae Centralis series (Hájek, 2007, 2009) with the permission from Kabourek Publishing Ltd. Photographs of the species lacking from the central European fauna have been added but these are unfortunately of lower quality and stand out as having being captured with a different system or with different settings (e.g. Hydroporus tessellatus plate 127 is somewhat overexposed, and the white balance of Gyrinus opacus plate 7 is clearly different compared with other Gyrinus species on the same page). The authors pay special attention to species with dimorphic females in the checklist, species texts and colour plates, a phenomenon which has attracted some research interest lately. However, it is confusing that some of these forms are presented as subspecies in the colour plates (Plate 114 Hydroporus memnonius castaneus Aubé, and Plate 153, Hygrotus impressopunctatus lineellus Gyllenhal). In general, however, having all species illustrated with colour photographs is of great value to an identification handbook. Finally, the greatest reward for the reader and user of this book is not that the British Isles now have an up-to-date handbook of Hydradephaga including user-friendly and illustrated determination keys, colour photographs and a province record catalogue. Rather, it is the detailed information the book contains with regard to each species' habitat preferences, behaviour, phenotypic variation, phenology, trends of decline and distribution. For example, I was astonished to read about the differences in swimming, flocking and escape behaviour of various whirligig species (Gyrinus spp.), which are notoriously difficult to identify in the field. This information is based on knowledge accumulated from decades of fieldwork and studies on water beetles and for that, the handbook is much more than an updated version of its predecessor (Friday, 1988). Johannes Bergsten 1" @default.
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• W2086540417 title "Keys to adults of the water beetles of Britain and Ireland (Part 1) - by G. N. Foster and L. E. Friday" @default.
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