BIOACUSTIC
Introduction
Bioacustic is an activity that has
application in the animal's behavior studies, in the species monitoring
and mainly those that are threatened of extinction, helping the species
identification and raising in a certain place, and it also can be a really
valuable environmental education instrument.
The effective application of
Bioacustic just was possible in a good level with the technological
development, because this Science needs the use of sophisticated sound
recorders, microphones and computers programs of good quality and this
just happened in some decades.
The Bioacustic studies have been
developed in many animal classes as birds, amphibians, mammals, insects
and reptiles. In fact, by the sound inveigling of bats and rats it is
possible knowing its occurrence in a place, because they normally live in
the dark, and this method is called ecolocalization. This way also happens
to cetaceans that have in the Bioacustic a very important way of
identifying and comprehension of their complex communication.
In relation to the birds, by
their variable vocalization way, Bioacustic is fundamental for the
knowledge of their big activities gamma, behavior and communication.
The graphic representation of
the sound is a powerful instrument of species' identification, because it
shows small differences between species' sounds that are alike to human
ears.
Inclusive, by the studies of the
animals sounds manifestations is possible identifying new species and
comparing voices standards between them, so Bioacustic is a necessary
help in the studies of s lot of branches of natural sciences.
Equipment
The equipment for Bioacustic studies
can be divided, generally, in: recorders, microphones and computer
programs for sound edition.
- Recorders: among the
recorders there are the tape ones (Sony TC5.000, Marantz PMP), of cylinder
(Nagara e Uhar), DAT (digital), Mini-disc (digital) as Sony MZ-R50 that
records with CD quality.
- Microphones: among
microphones there are the famous Sennheisers (ME67, com K8). Also the
similar ones as AT815. They are all potent directional microphones,
capable of catching the sound in good distances, making easier the field
work. There are also the parables that are used a lot, because it
captivates the sounds perfectly.
- Edition Computer Sotwares:
the Canary program is the most used one, but there are also another ones
that are less sophisticated that comes together to the original programs
and that can work the sound in a very satisfactory way.
Hints for good nature recordings
Firstly is very important being
prepared with adequate equipment for the work that will be done. If it is
the recording of birds vocalization it is essential the usage of
directional microphones. For recording whales and dolphins an hydrophone
is used.
Having the right equipment, we
are going to start the sounds captivating that are intended, being always
careful to the not desirable noise interfering in the work, and we also
must walk carefully, for not frightening the animal. This means that most
part of the time we must be stopped or walk in silence and wearing clothes
with colors that are alike the environment, green in the forest and kaki
in the field. We must remember that most of the birds and mammals have
excellent vision.
Having the recordings, the
second step is using them in the proposed studies, putting them in
sonograma way, filing them in an easy way for founding. In the files must
be the animals' name, place, date, the recording author, the file number
and the recorder format. Ex.: Hyla faber, PN Itatiaia-RJ,10-99,AS,456,D
The files must have a lot of
minutes, but a variation must be done with just some segunds and with
small resolution, because for sending a file by e-mail, it must not have
more than 300K. Besides, being small, it can be added in sites.
We recommend that the files are
put in a way that makes possible an easy usage. For this it is really
important creating files by animal classes, families etc. It is also good
a file by alphabetical order, making easier finding a certain species
quickly.
Conclusion
So, Bioacustic is a Science that has
been developed a lot and has been bringing help in a lot of elucidation
about animal's communication, behavior and identification. Besides, by its
popularization and divulgation is possible making people conscious about
environmental preservation, because with better animal's knowledge it is
possible developing effective environmental education programs.
Besides being a science,
Bioacustic's results can and must be used in the very important
environmental education process.
Links
http://www.bl.uk/collections/sound-archive/wild.html (The Britsh Library)
http://www.biologie.uni-freiburg.de/data/zoology/riede/riedehome.html
http://interact.uoregon.edu/MediaLit/WFAE/studies/index.html
http://ww1.naturesound.com/webpages2/naturesound/frogs/frogs.html
http://ourworld.compuserve.com/homepages/G_Kunkel/homepage.htm
http://www.zi.biologie.uni-muenchen.de/institute/zi/abtlgn/neurobiologie/index.html
http://hem.fyristorg.com/mild/english/page8.htm#Bioakustiska institutioner
Equipment
General
Laboratories/ Bioacustic Archieves
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