Kirschel, A. ., University of California Los Angeles, Los Angeles, USA, kirschel@ucla.edu
Blumstein, D. T., University of California Los Angeles, Los Angeles, USA, marmots@ucla.edu
Smith, T. B., University of California Los Angeles, Los Angeles, USA, tbsmith@ucla.edu

PATTERNS OF PHENOTYPIC EVOLUTION IN TWO RELATED AFRICAN BARBETS

We examined a pattern of divergence in bird song and morphology where the ranges of two related African barbets overlap. Character displacement occurs when the coexistence of two related species leads to divergence in morphological, ecological or behavioral traits. Bird songs are expected to diverge from those of sympatric related species to prevent species recognition errors or as a by-product of morphological divergence driven by competition for resources. Yet, character displacement in bird song has not been convincingly demonstrated. We recorded Pogoniulus bilineatus and Pogoniulus subsulphureus in sympatric and allopatric populations in sub-Saharan Africa, and measured song features for each species. We collected data on body size and beak shape from the field and at museums. We present analyses on phenotypic variation across landscapes and discuss biogeographical, ecological and genetic factors that could explain observed patterns.

Oral presentation

Session #:G14
Date: Tuesday, 8/5/08
Time: 11:00 AM

Presentation is given by student: Yes