Mesh size and bird capture rates in Mato Grosso do Sul State, Brazil

Abstract

Mist-nets alternating 36-mm and 61-mm mesh in woods and low vegetation of "cerrado" (Brazilian savanna) tested bird-capture efficiency relative to bird length and mass. Of 1,296 birds captured and 102 species, 785 (93 species) were with 36-m mesh and 511 (69 species) with 61-mm mesh. The 61-mm mesh improved capture rates only for some larger species; so, in general, 36-mm mesh mistnets are more appropriate for field work in "cerrado" areas.

Selectividad de las diferentes redes de malla de niebla en la captura de zorzales ocurrida en un parque urbano en el centro-sur del Estado de Paraná, Brasil / The selectivity of different mist-nets meshes for capture of thrushes occurring in an urban park in central-southern of Paraná State, Brazil

“…Proporciones iguales en la selectividad entre las distintas mallas nos permiten inferir que, éstas no presentaron errores de muestreo, pues su éxito de captura es similar entre las aves estudiadas. Los datos obtenidos por Piratelli (2003), demuestran que los cambios en las tasas de captura ocurren cuando existe una gran variación entre el tamaño de las especies. De manera similar, Lövei et al (2001), demostraron que para especies morfológicamente diferentes, el éxito de captura cambia dentro de un mismo tamaño de malla.…”

“…Se sabe que diferentes tamaños de malla pueden generar diferentes tasas de captura y selectividad en ciertas especies (PIRATELLI, 2003). Los datos de Lövei et al (2001) demostraron que para las especies morfológicamente diferentes, hubo cambios en la tasa de éxito de captura con la misma malla.…”

Trogon rufus Gmelin, 1788, Baryphthengus ruficapillus (Vieillot, 1818), Notharchus swainsoni (Gray, 1846), Synallaxis ruficapilla Vieillot, 1819, Tyrannopsis sulphurea (Spix, 1825) and Procnias nudicollis (Vieillot, 1817) (Aves): documented records in the state of Mato Grosso do Sul, Brazil

“…Although this variation in the landscape provides suitable conditions for high bird species richness, there is a knowledge gap in Mato Grosso do Sul concerning species occurrence and distribution (Pivatto et al 2006). Some studies have been undertaken to determine the bird composition of specific localities outside the Pantanal wetland, such as in the east (Piratelli et al 2001;Piratelli and Pereira 2002;Piratelli 2003;Piratelli and Blake 2006), west , north (Silva et al 2006), south (Gimenes et al 2007Faxina and Schlemmermeyer 2010) and central regions of the state (Ilha and Mercante 2003a, b). Especially the southern region has been poorly studied in terms of its avifauna, and most of the available information is restricted to locations near the Paraná River (Straube and Urben-Filho 2002).…”

Testing capturing methods for the Yellow-legged Tinamou Crypturellus noctivagus (Wied, 1820) (Aves, Tinamidae) in southern Brazil

“…Specific techniques focused in capturing and handling tinamous in the field are still poorly available in the scientific literature and usually lack detailed descriptions of species-specific adaptions for different environments. Despite the difficulties, Piratelli (2003), Brennan (2004), Ghizoni-Jr. & Graipel (2005), Garnero et al (2006), Freitas et al (2013), Garitano-Zavala et al (2013) and Silva et al (2013) described procedures that resulted in successfully capture of tinamous in their natural habitats.…”