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 Post subject: Help
PostPosted: Tue Aug 06, 2013 10:53 pm 
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Lincs Bird Club Member
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Joined: Wed May 30, 2012 7:00 pm
Posts: 150
Location: Wyberton
Hi. Quick question. Well, two questions, actually.

I stumbled across a bat roost in an old Green Woodpecker nest-hole on my local patch this evening. Unfortunately, to my shame, I am embarrassingly ignorant in this department. So,

a) Where is the best place to report this?
b) Is there a species of bat that this is liable to be? The roost (of around two dozen) was suprisingly audible from twenty feet away and when they emerged they seemed larger than pipistrelle (which is the only species I am vaguely familiar with).

Many thanks in advance.

_________________
"Accept that some days you are the pigeon, and some days you are the statue."

Patch YTD: 155


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 Post subject: Re: Help
PostPosted: Wed Aug 07, 2013 1:00 am 
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Joined: Thu Dec 30, 2004 8:09 pm
Posts: 252
Location: Lincoln
Daniel.
Last time , I heard county bat recorder was Annette Faulkner. Look on the Lincs Trust website, there should be a link, or call them on 01507-526667.
Brian.


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PostPosted: Wed Sep 04, 2013 9:08 pm 
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Joined: Wed May 30, 2012 7:00 pm
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Location: Wyberton
Thanks very much, Brian.

I got in touch with Annette from the Lincs Bat Group and she got Ian Nixon on the case. He brought a couple of trainees along to observe the roost and take some recordings. It was genuinely fascinating stuff. Here Ian's analysis...

Quote:
Daniel,

Please find attached a sample of the sound recordings I made on Sunday. The common pipistrelle has a peak frequency around 45kHz whilst the noctule echolocation calls are in two parts (a chip, chop sound) around 18kHz and 25kHz respectively. Interestingly before they emerged they concentrated on just the ‘chip’ part which can be seen in one of the snapshots. Also there were social calls which have a different function to the echolocation ‘seeing’ calls but the exact nature of them is not fully understood but is believed to be some form of communication.

I have talked with Annette about the roost and she thinks that it is the first record of a noctule roost in the Fens for many years. But, as is usual with bats, it presents many more questions than it answers – where did these bats come from, where was the roost prior to this year, where do they forage, where do they disperse to and how many were there when the roost was at its peak, to name just a few. It will be interesting to see if they return next year and we might be able to answer some of them.

Thank you very much for taking the time to report the bats and also for your time on Sunday, it is much appreciated.

Kind regards

Ian

_________________
"Accept that some days you are the pigeon, and some days you are the statue."

Patch YTD: 155


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