Mid-summer update

As we approach the end of June most of the dragonfly and damselfly species that are known to be breeding in Hertfordshire have now been reported during 2018, although we may have to wait a bit longer for the first records of late summer/autumn species such as Migrant Hawker (Aeshna mixta) and Willow Emerald Damselfly (Chalcolestes viridis).

Sighting of some of the earliest flying species, in particular Hairy Dragonfly (Brachytron pratense) but also chasers like the Four-spotted Chaser (Libellula quadrimaculata) shown below, will now start to tail off, but many of the more obvious species such as Brown & Southern Hawkers (Aeshna grandis & A. cyanea) and Ruddy & Common Darters (Sympetrum sanguineum S. striolatum) will become more numerous during July and August.

Exciting news this year is that the Green-eyed Hawkers (Anaciaeshna isoceles - also known as Norfolk Hawkers - but that name doesn't seem appropriate any more) that arrived at Amwell four years ago seem to be expanding their Hertfordshire distribution and have so far been reported from three additional Hertfordshire sites, all close to Amwell.

Beautiful Demoiselles, which established a population just outside Hertfordshire a few years ago, on the Turkey Brook at Forty Hall, Middlesex, also seem to be spreading into Hertfordshire, with two reports of what were presumably wandering individuals in the east of the county and reports from Cuffley Brook in the south-east (not too far from Forty Hall). If anyone wants to see this species locally it is best looked for at Forty Hall with the bridge over Turkey Brook at TQ342987 being a good spot. To see them in Hertfordshire the points where public footpaths cross Cuffley Brook at TL315009 and TL310015 seem to provide the best opportunity, but they are at very low density along the brook. More on the Beautiful Demoiselles and Green-eyed Hawkers will follow in the next few days.

Please submit records of any dragonflies and damselflies that you see, including common species, using the record submission form on the HNHS website (http://www.hnhs.org/submit/dragonflies-and-damselflies), via iRecord, or by email to the following email address: dragonflies@hnhs.org  

 

New 'Hertfordshire Dragonflies and Damselflies Facebook group

I have set up a Facebook group that anyone with an interest in the dragonflies and damselflies of Hertfordshire, who uses Facebook, may like to join to share sightings and photos.

A link to the group can be found here: Herts dragonflies Facebook group   

 

HNHS Awards for 2024

If you know an outstanding Hertfordshire naturalist or someone who has made outstanding contribution to natural history in our county consider nominating them for an HNHS Award this year.

Continuing concern over Broadwater Lake SSSI future

Despite receiving more than 1,200 objections to its plans the London Borough of Hillingdon still appears intent on creating a large watersports centre on the Broadwater Lake Site of Special Scientific Interest. The lake is part of the Colne Valley wetland system which extends into Hertfordshire and is nationally important for wintering wildfowl.  

Optimow 2024 – citizen science to help garden pollinators

Scientists are inviting gardeners interested in helping bees, butterflies and other pollinators to take part in a study to discover how grass mowing can be timed to maximise their impact.

Participants in the Optimow 2024 project, organised by the Brown Lab at Royal Holloway, University of London  will be asked to follow a mowing frequency plan, while submitting weekly counts of the key pollinators sighted in their gardens.