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Re: Help with underwater identification please

Subject: Re: Help with underwater identification please
From: "Bernie Krause" bigchirp1
Date: Sat Feb 3, 2018 7:37 am ((PST))
Also, becasue of the nature of its signal and its relatively shallow marine=
 environment, the sound of the insect doesn=92t carry very far. The snappin=
g shrimp, by contrast, puts out a signal so loud that it momentarily stuns =
prey (usually fish) as they swim by. The shrimp=92s targets are immobilized=
 long enough for the shrimp to snag a bite of lunch from the caudal or dors=
al fin, for example.


Wild Sanctuary
POB 536
Glen Ellen, CA 95442

SKYPE: WildSanctuary
TED Global talk:

> On Feb 3, 2018, at 7:30 AM, 303  [naturerecordists] <n=
> wrote:
> Interesting. Several of the articles I read about the water boat men say =
it=92s that loud it can be heard above water. That was definitely not the c=
ase when I was recording. Only the hydrophones picked up its call.
>> On 3 Feb 2018, at 23:15, Bernie Krause  <c=
> [naturerecordists] <=
m <>> wrote:
>> Yup! But I=92m guessing that the article is mistaken in that perhaps the=
 snapping shrimp (sometimes called pistol shrimp), a bit under 4 cm in leng=
th, and part of the Alpheidae family, is probably louder vis a vis size. Un=
derwater the snapping shrimp will generate an impulse signal of around 200d=
B re 1micro Pascal, which is equivalent to firing off a ..357 Magnum pistol=
 about 30 cm from your ear (or about 165dB in air).
>> Bernie
>> Wild Sanctuary
>> POB 536
>> Glen Ellen, CA 95442
>> 707-327-6771
>> <>
>>  <>
>> SKYPE: WildSanctuary
>> FaceBook: <http://www.faceboo=>
>> TED Global talk:
e_natural_world?language=3Den <
>>> On Feb 3, 2018, at 7:03 AM, 303  <=> [naturerecordists] < <natu=
>> wrote:
>>> Thanks Bernie, is this what you=92re talking about?
>>> <
>>>> On 3 Feb 2018, at 22:16, Bernie Krause  <mailto=
:> [naturerecordists] <=
com <>> wrote:
>>>> Mostly, it sounds like common species of what, in English, are called =
water-boatmen (Corixidae). These can be found everywhere there is fresh wat=
er and decaying floral debris in vernal pools, in shallow water by ponds an=
d lakeside, and even by the curb after a spring or summer rain, etc.
>>>> We first encountered these signatures in late March, 1984, at Mono Lak=
e just east of the Sierra Nevada Mountains along the Eastern border of Cali=
fornia while recording the Great Basin spadefoot toad (Spea intermontana) i=
n a study for the University of California in Santa Cruz led by the late Ke=
n Norris (who identified how dolphins generate and receive echolocation sig=
nals). We were recording to see if the tadpoles generated sound (they do), =
and if the vocalizations of the adults carried in water as well as air (the=
y do). At the same time, we picked up these odd scraping sounds (water-boat=
men) but couldn=92t identify them, at first. But after filling some buckets=
 with water and mud from the pond, and sifting through the material, we wer=
e left with the water-boatmen and were able to record them separately, thus=
 figuring out the source.
>>>> Bernie
>>>> Wild Sanctuary
>>>> POB 536
>>>> Glen Ellen, CA 95442
>>>> 707-327-6771
>>>> <>
>>>>  <>
>>>> SKYPE: WildSanctuary
>>>> FaceBook: <http://www..face=>
>>>> TED Global talk:
the_natural_world?language=3Den <
>>>>> On Feb 3, 2018, at 1:20 AM,  <calandrel=
> [naturerecordists] < <mailt=
o:>> wrote:
>>>>> Below the links to soundcloud for two of my underwater recordings fro=
m Italy.
>>>>> Sounds are similar to that of your recording, but surely emitted by d=
ifferent species of small aquatic insects.
>>>>> Marco
>>>>> pesente/corixa-punctata-sound <https://=>
>>>>> pesente/micronecta-sp-lesser- water <ht=

"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.

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