Trophic niche width increases with bill-size variation in a generalist passerine: A test of niche variation hypothesis

Earth & Environmental Sciences

• passerine 100%
• generalist 84%
• niche 69%
• test 28%
• sexual dimorphism 25%
• environmental gradient 22%
• sexual selection 15%
• nitrogen isotope 11%
• feather 5%
• ellipse 5%
• trophic level 4%
• carbon isotope 4%
• stable isotope 4%
• bird 4%

Agriculture & Biology

• niches 64%
• testing 28%
• sexual dimorphism 20%
• sexual selection 10%
• isotopes 9%
• carbon isotopes 5%
• nitrogen 5%
• trophic levels 5%
• stable isotopes 5%
• feathers 4%
• phenotypic variation 4%
• wines 4%
• birds 2%