The Entomological Section's Recorders' Reports and Conversazione will take place at Wilberfoss Community Centre on Saturday 3rd March 2018 from 10:30am to 4:30pm.
Water beetles are among the most diverse freshwater macro-invertebrates: in still waters, around half the species detected in a typical pond-net sample will be beetles. This makes these insects important to any understanding of wetland biodiversity.
Yorkshire has a particularly rich fauna of aquatic Coleoptera. Amongst the groups covered by this atlas, 78% of the British species were recorded in the County in 2000-2016. This reflects the unique biogeography of our region, straddling the divide between the northern and western uplands and the eastern lowlands. Saltmarshes, ponds, fens, bogs, upland tarns, rivers and springs all support their own distinctive assemblages. Numerous species reach the northern or southern limit of their English distribution in Yorkshire, so this atlas will provide a baseline to help monitor future changes. Forty-eight Yorkshire water beetles are categorised as Nationally Scarce, 17 as Near Threatened and eight as Vulnerable.
This atlas is based on an intensive survey of Watsonian Yorkshire producing just over 62,000 records for the period 2000-2016. Records are mapped for each of the 210 species at a tetrad (2 x 2 km square) resolution, providing a fine-grained picture of regional distribution.
Elmis aenea: the most widespread riffle beetle in Yorkshire
In addition to the species accounts, there is a brief history of water beetle recording in Yorkshire, a review of Quaternary subfossils, advice on survey methods, a summary of additional species recorded in the 19th and 20th centuries, and a chapter on wetland habitats.
The water beetles of Yorkshire by Martin Hammond
324 A5 pages, spiral bound
Published by YHEDT Publishing
Available for £6.00 + £2.95 p&p per copy from:
North & East Yorkshire Ecological Data Centre
10a Minster Gates, York YO1 7HL (we can also offer collection in person from the NEYEDC office in York, by arrangement).
Please make cheques payable to: Yorkshire & Humber Ecological Data Trust or email for information on payment by bank transfer.
(16th February 2017)
YNU member Barry Warrington has recently set up a new national recording scheme for the Agromyzidae, leaf-mining flies.
The Agromyzidae are a large family with approximately 400 species recorded in the UK. The majority of species feed within the leaves of plants, often making distinctive patterns – commonly referred to leafmines - which, combined with how the larva deposits its frass, is often unique to a particular species.
The adult flies are very small and some can only be identified by examining the male genitalia. However, some species can be readily indentified by considering the host plant, shape of the mine, frass pattern and pupal features. Gardens are a fantastic place to find leaf-mining flies, due to the wide range of host plants available. Mines can generally be found throughout the year, with the peak-time being May to August.
There is still so much we don’t know about Agromyzidae - this recording scheme has been set up to help gain a much greater understanding of the family, in terms of population and distribution trends, host plants and lifestyle. In addition to running the national scheme and collating records from all over the UK, Barry is also the YNU recorder for this family and welcomes records from experts and novices alike.
A website for the scheme is currently under development. You can also find further information on the Biological Records Centre website here.
Mine of Phytomyza minuscula on Aquilegia Mine of Liriomyza strigata on Sow-thistle
All photos by Barry Warrington.
(17th December 2016)