Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

A Comparative Study of Hearing in Owls of the Family Strigidae

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

In view of throwing new light on some zoogeographical and systematical problems in owls, we started a comparative study on hearing in these birds. On the basis of conditioning experiments audibility curves were obtained from 6 Tawny Owls (Strix aluco L.) and 6 Long-eared Owls (Asio otus (L.)). In addition cochlear potentials, evoked by tone-bursts, were derived from 5 Tawny Owls and 4 Long-eared Owls. The size of the potentials was correlated to the applied sound levels. Curves of varying frequency and sound pressure at constant size of the cochlear potential were obtained, showing to some extent the owls' frequency response. The audible frequency ranges found appeared to rank among the best high-frequency hearing known in birds at present, the high-frequency cut-off (defined as frequency with hearing threshold as loud as 0 db = 1μbar/cm2) being about 13 kHz. With regard to sensitivity of hearing, the owls proved to be extremely good hearers with lowest thresholds of - 91 db for the Tawny Owl and - 95 db for the Long-eared Owl. The frequency range of very good sensitivity extends from about 0.4-7 kHz in Tawny Owls and from about 0.5-8 kHz in Long-eared Owls (thresholds for these frequencies do not exceed - 80 db). This stands for 4 octaves of very sensitive hearing. These hearing characteristics have been shown in the Figs 3 and 4. The results obtained from the cochlear potentials corresponded rather well with the behavioral findings (Figs 7 and 8). Some systematical lack of correspondence could be explained to a certain extent, as being caused by differences in applied methods. In additional experiments behavioral audibility curves were also collected from 9 owls belonging to 8 other species of which the external ears are less specialized than those of Tawny and Long-eared Owls (Fig. 9). In these 8 species we found a wide range of hearing sensitivity. The best hearing individuals showed a sensitivity of the same order as that found in Tawny and Long-eared Owls. However, their frequency range of very high sensitivity never exceeded 6 kHz in contrast to the more extended ranges of Tawny and Long-eared Owls (Fig. 10). The relevancy of these data for owl systematics was discussed.

Affiliations: 1: Biological Laboratory, Free University, Amsterdam, The Netherlands

10.1163/002829673X00120
/content/journals/10.1163/002829673x00120
dcterms_title,pub_keyword,dcterms_description,pub_author
6
3
Loading
Loading

Full text loading...

/content/journals/10.1163/002829673x00120
Loading

Data & Media loading...

http://brill.metastore.ingenta.com/content/journals/10.1163/002829673x00120
Loading

Article metrics loading...

/content/journals/10.1163/002829673x00120
1972-01-01
2016-12-05

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
     
    Netherlands Journal of Zoology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation