Population densities of some nocturnal raptor species (Strigidae) in southeastern Peru (original) (raw)

How to translate text using browser tools

1 October 2003 Population densities of some nocturnal raptor species (Strigidae) in southeastern Peru

Huw Lloyd

Author Affiliations +

Huw Lloyd1,*

1TReeS-RAMOS, Casilla 28, Puerto Maldonado, Madre de Dios, Peru

*Current address: Room E418, Department of Environmental and Geographical Sciences, Manchester Metropolitan University, John Dalton Extension Building, Chester Street, Manchester, M1 5GD United Kingdom. H.Lloyd@mmu.ac.uk

Abstract

Line transects based on distance sampling methodology were used to census nocturnal raptor species in three different primary lowland forest habitats in the Tambopata region, southeastren Peru. Density estimates were calculated for five owl species in these forest habitats. In general, species were more abundant in primary old floodplain or primary middle/upper floodplain forests than in primary seasonally flooded swamp forest. Density estimates were also higher than those calculated from traditional spot-mapping methods in other lowland forest sites in southeastern Peru and French Guiana. There was no significant difference in the number of individual owls recorded during nights with different cloud cover or during different phases of the moon. Problems of distance estimation at night and unfamiliarity with a range of vocalizations, particularly with Strix owls, may be overcome by conducting a practice period before surveys are undertaken, with transect routes and distance markers adequately set out. Walking transect routes during daylight hours in a practice period also helps to overcome concerns of observer safety.

Citation Download Citation

Huw Lloyd "Population densities of some nocturnal raptor species (Strigidae) in southeastern Peru," Journal of Field Ornithology 74(4), 376-380, (1 October 2003). https://doi.org/10.1648/0273-8570-74.4.376

Received: 29 April 2002; Accepted: 1 January 2003; Published: 1 October 2003

ACCESS THE FULL ARTICLE

PURCHASE THIS CONTENT

PURCHASE SINGLE ARTICLE

This article is only available to subscribers.
It is not available for individual sale.

JOURNAL ARTICLE
5 PAGES

This article is only available to subscribers.
It is not available for individual sale.