Help on ID please?

[Tim]

Ummmm...

 

I'd guess Miniopterus australus, except that a) there's no down sweeping tail; b) It's kinda out of range for them; c) I'm crap at this...

I'm sure someone here will laugh hysterically and be able to point out just what it is?

 

It's in the Blue Mts, which I would have thought would rule out some of the more obvious suspects. But what would I know?

 

Thanks...

 

tim

[Stefan Nyman]

Hi Tim,

I suppose you don’t have the wav-file?

I am crap at zero crossing but I have made some full spectrum recordings in Blue Mts

Take a look: http://www.nsw.chiroptera.se/little-bent-winged-bat/

 

Those 50-60 kHz species are tricky (Vespadelus, Miniopterus)

So no one is going to laugh!

 

^ö^ Stefan

--
You received this message because you are subscribed to the Google Groups "Australasian bat call group" group.
To unsubscribe from this group and stop receiving emails from it, send an email to kilohertz+...@googlegroups.com.
To post to this group, send email to kilo...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Virusfritt. www.avast.com

[Tim Pearson]

Sorry Stefan, recordings were taken with a SM4-ZC, so no full spectrum...

I like your spectographs. What's confusing me about these calls is that there's no down sweeping tail, but also no strong upsweep. And as far as I know, none of the possibilities are commonly known in the Blue Mountains.

The detector was facing a culvert, and the calls were c. 45 minutes after sunset, which makes me think Miniopterus, but....

tim

On Tue, Nov 7, 2017 at 9:10 PM, Stefan Nyman <stefan...@chiroptera.se> wrote:

Hi Tim,

I suppose you don’t have the wav-file?

I am crap at zero crossing but I have made some full spectrum recordings in Blue Mts

Take a look: http://www.nsw.chiroptera.se/little-bent-winged-bat/

 

Those 50-60 kHz species are tricky (Vespadelus, Miniopterus)

So no one is going to laugh!

 

^ö^ Stefan

 

Från: kilo...@googlegroups.com [mailto:kilohertz@googlegroups.com] För Tim
Skickat: den 7 november 2017 07:23
Till: 'Australasian bat call group'
Ämne: [Australasian batcall group: 323] Help on ID please?

 

Ummmm...

 

I'd guess Miniopterus australus, except that a) there's no down sweeping tail; b) It's kinda out of range for them; c) I'm crap at this...

I'm sure someone here will laugh hysterically and be able to point out just what it is?

 

It's in the Blue Mts, which I would have thought would rule out some of the more obvious suspects. But what would I know?

 

Thanks...

 

tim

--
You received this message because you are subscribed to the Google Groups "Australasian bat call group" group.

To unsubscribe from this group and stop receiving emails from it, send an email to kilohertz+unsubscribe@googlegroups.com.

To post to this group, send email to kilo...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Virusfritt. www.avast.com

--

You received this message because you are subscribed to the Google Groups "Australasian bat call group" group.

To unsubscribe from this group and stop receiving emails from it, send an email to kilohertz+unsubscribe@googlegroups.com.

[Chris Corben]

Hi Tim

First these are high clutter sequences, as shown by the high pulse repetition rate. They are too low in Fc for MIAU, especially given the call shape. MIAU doesn't always show a drooping tail, but usually will in high clutter, and even in high clutter, its calls are typically longer than this in duration. Also, the feeding buzz at the end of the first file is not a Miniopterus feeding buzz. So the bat is a Vespertilionid.

Given the shape and frequency, I would suggest either a Vespadelus or CHMO. The thing which strikes me about your sequences is the relatively low initial slopes in combination with very short duration calls. This suggests to me that CHMO might be the more likely candidate. I find that typically bats which make very low slope calls in low clutter tend to start the pulses very steep in higher clutter, while bats which don't get so low in slope often start their pulses less steep. A good example of this would be comparing CHGO with FATA. I do have some known recordings of CHMO which show a few pulses quite like yours, while my recordings of VETR or VEPU do not, because by the time the pulses get so short in duration, the calls are initially very steep and there is not this concentration of energy at the end.

CHMO are not always droopy at the end. They sometimes alternate droopy bodies with upswept toes! In bat acoustics, rules are only there to be broken....

Needs more research and may well never be resolved. Certainly no shame in not knowing what you have there! It would be interesting to see what CHMO do when leaving a roost, and I have lots of those from Bunya Mtns, but not at my finger tips! But it is interesting that in a quick look through a bunch of recordings I have, I see very little evidence of calls like yours, showing such a pronounced concentration of energy at the bottom of the pulse combined with such short durations. We tend to ignore high clutter sequences in favour of low clutter calls, but I think it is worth taking more notice of them.

Cheers, Chris.

To unsubscribe from this group and stop receiving emails from it, send an email to kilohertz+...@googlegroups.com.

To post to this group, send email to kilo...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

-- 

Chris Corben.