22 research outputs found
Predation on artificial nests in open habitats of central Brazil: effects of time and egg size
Movement patterns of adult male Ovenbirds during the post-fledging period in fragmented and forested boreal landscapes
Comparing the effects of landscape fragmentation by forestry and agriculture on predation of artificial nests
Sound attenuation in forest and roadside environments: Implications for avian point-count surveys
Animal science
Forest fragmentation and predation on artificial nests in the Usambara Mountains, Tanzania
Possible Effects of Nest Predation on Ground Nest Survival in the Neretva Delta (Croatia)
Effect of Extended Cook Times on Certain Physical and Chemical Characteristics of Beef Prepared in a Waterbath
Predação de ninhos artificiais em uma ilha na Mata Atlântica: testando o local e o tipo de ovo Artificial nest predation in Atlantic Forest Island: testing the place and the different types of egg
Experimentos com ninhos artificiais são utilizados para testar hipóteses ecológicas e comportamentais que influenciam na predação de ninhos naturais. O tamanho do ovo, a textura da casca e a cor podem influenciar na taxa de predação, porém poucos estudos avaliam qual modelo de ovo é o mais adequado para simular a predação de ninhos em áreas tropicais. O objetivo deste trabalho foi comparar a predação de diferentes modelos de ovos (ovos de codorna, massa de modelar e canários) no solo e a 1,30 m de altura no sub-bosque. O experimento foi realizado Ilha Anchieta, Ubatuba, São Paulo, Brasil. Foi encontrada uma diferença significativa na taxa de predação entre os ovos de codorna (71,87%) e sintéticos (93,75%) e entre os ovos de codorna e de canário (100%) no solo. Entretanto, não houve diferença significativa entre os ovos sintéticos e de canário. Os ninhos no sub-bosque apresentaram um padrão diferenciado do solo quando se refere aos ovos de codorna (25%) e sintéticos (28,1%), mas houve diferenças significativas quando os ovos de canário foram comparados com os ovos sintéticos e de codorna. Nosso trabalho demonstrou que diferentes tipos de ovos sobre uma mesma pressão de mesopredadores apresentaram taxas de predação diferentes. Portanto, estudos que avaliam o sucesso reprodutivo da avifauna baseado na predação de ninhos artificiais devem considerar a utilização de diferentes tipos de ovos e estratos na vegetação.<br>Experiments on artificial nests are usually used to test ecological hypothesis and behavioural that affects the predation of natural bird nests. It is has been discussed about the size of the egg, texture and color affecting predation rate, but a few studies evaluate which egg type is more appropriate to simulate nest predation in tropical areas. The objective of this work was to compare the predation of different models of eggs (Coturnix coturnix, plasticine and Serinus canarius) on the ground and understory in a island with high abundance of nest predators. The study was carry out in October 2004 at Anchieta Island, Ubatuba, São Paulo, Brazil. The nests on the ground showed a statistical significance difference in the predation of quail eggs, plasticine and canary eggs. However, we did not find differences between plasticine and canaries eggs. The nests in the understory had a different pattern on the ground of quail eggs (25%) and plasticine (28%) and there was a difference when we compare canary eggs with plasticine and quail eggs. Our work pointed out that different eggs may have different predation rates. Therefore, studies that evaluate reproductive fitness of the bird community based on artificial nests must considered different egg types and strata