Skip to main content Accessibility help
×
×
Home

The influence of riparian vegetation, woody debris, stream morphology and human activity on the use of rivers by southern river otters in Lontra provocax in Chile

  • Gonzalo Medina-Vogel (a1), Vera S. Kaufman (a1), René Monsalve (a1) and Vicente Gomez (a1)
Abstract

The distribution of the Endangered southern river otter Lontra provocax population in southern Chile has contracted, causing concern among otter specialists and conservationists. The main factor contributing to this decline is the loss of suitable habitat. Because the Chilean Irrigation Law promotes land drainage, the removal of riparian vegetation and canalization of lowland rivers in several provinces, this situation could deteriorate further. Using an Index of Revisitation Rate (IRR), we assessed the influence of woody debris, riparian vegetation, river bank morphology and river canalization on the use of rivers and streams by the southern river otter. Surveys were conducted on foot, on a monthly basis, between April 1999 and March 2001 in the south of Chile. The surveys covered 13 sections of rivers and streams, 3 km long and <50 m wide. River and stream banks with high density of riparian vegetation, woody debris and exposed roots had the highest IRR; most of the highly marked sprainting sites were found in this habitat. Canalized rivers and streams lacking these characteristics had the lowest IRR and hardly any highly marked sprainting sites. The data indicates that otters can tolerate some degree of riparian vegetation removal, provided there is minimum use of floodplains by humans. Temperate evergreen ombrophilus swamp forests and shallow watercourses with woody debris or gravel, riparian vegetation and a plentiful supply of macrocrustaceans appear to be the preferred habitat and conditions for the otter and may be key to its survival in freshwater habitats.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      The influence of riparian vegetation, woody debris, stream morphology and human activity on the use of rivers by southern river otters in Lontra provocax in Chile
      Available formats
      ×
      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      The influence of riparian vegetation, woody debris, stream morphology and human activity on the use of rivers by southern river otters in Lontra provocax in Chile
      Available formats
      ×
      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      The influence of riparian vegetation, woody debris, stream morphology and human activity on the use of rivers by southern river otters in Lontra provocax in Chile
      Available formats
      ×
Copyright
Corresponding author
Instituto de Ecología y Evolución, Universidad Austral de Chile, Casilla 567, Valdivia, Chile. E-mail: gmedina@uach.cl
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Oryx
  • ISSN: 0030-6053
  • EISSN: 1365-3008
  • URL: /core/journals/oryx
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed