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Is Reproduction By Tree Swallows (Tachycineta Bicolor) Cost-Free?, Michael T. Murphy
Is Reproduction By Tree Swallows (Tachycineta Bicolor) Cost-Free?, Michael T. Murphy
Biology Faculty Publications and Presentations
We manipulated brood sizes of Tree Swallows (Tachycineta bicolor) in 1996 and 1997 to test for the existence of intra- and intergenerational costs of reproduction. Modal clutch size was six eggs, but experimental brood sizes ranged from two to nine young. Nestling starvation was higher in 1996 (and dependent on brood size) than in 1997, but in both years enlargement of brood size resulted in increased productivity. Nestling mass near fledging was negatively correlated with brood size, but tarsus length and wing chord were not. Food deliveries by parents increased steadily between broods of two to six young but then …
Nesting Of Rose-Throated Becard Pachyramphus Aglaiae (Passeriformes: Incertae Sedis) And Clay-Colored Robin Turdus Grayi (Passeriformes: Turdidae) In Hidalgo County, Texas, Timothy Brush
Biology Faculty Publications and Presentations
No abstract provided.
Field Notes On The Biology Of The Long-Wattled Umbrellabird Cephalopterus Penduliger In West Ecuador., Karl S. Berg
Field Notes On The Biology Of The Long-Wattled Umbrellabird Cephalopterus Penduliger In West Ecuador., Karl S. Berg
Biology Faculty Publications and Presentations
La biología del Pajaro Paraguas Longipendulo Cephalopterus penduliger es quizas lo menos conocido del genero. A pesar de eso, lo consideraron una de las especies más amenzadas en el continente Sudamericano debido a la deforestación, caza y a un grado menor, la comercialización de las aves como mascotas. Entre febrero y octubre de 1998 yo observe C. penduliger a lo largo del período y 1.600 horas de observación en la Estación Biológica Jatun Sacha Bilsa, Provincia de Esmeraldas, Ecuador. Documente varios aspectos de las observaciones incluyendo un sonogramo de dos vocalizaciones, descripciones de comportamiento, forrageo y las primeras fotos de …
First Nesting Record Of Blue Jay (Cyanocitta Cristata) In Hidalgo County, Texas, Timothy Brush
First Nesting Record Of Blue Jay (Cyanocitta Cristata) In Hidalgo County, Texas, Timothy Brush
Biology Faculty Publications and Presentations
No abstract provided.