Answers are grounded in this paper and cite their sources.
The composition of a riparian avifauna can vary considerably between the head-waters and lower reaches of a river. What are the physical features that influence the distributions of particular species?
No takes yet. Share an insight, caveat, or question.
Round et al. (1984) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: