NDLI: Adaptations for rapid and forceful contraction in wing muscles of the male golden-collared manakin: sex and species comparisons

Content Provider	Springer Nature Link
Author	Schultz, Douglas J. Hertel, Fritz Bauch, Monika Schlinger, Barney A.
Copyright Year	2001
Abstract	The courtship display of the male golden-collared manakin (Manacus vitellinus) of Panamanian rainforests is noteworthy for several types of whip-crack-like sounds created by a rapid overhead flip of the wings. We have hypothesized that this courtship behavior, which is not performed by females, is associated with steroid-sensitive and sexually dimorphic neuromuscular systems. Presumably, muscles creating the motion of the wingsnap in males are specialized for greater force generation and speed of contraction. We tested this hypothesis by examining mass, fiber diameter, metabolic enzyme activity, and myosin isoform expression in several muscles of male and female manakins and in both sexes of a non-wingsnapping bird, the zebra finch (Taenopygia guttata). We have identified three wing muscles, the scapulohumeralis caudalis, the supracoracoideus, and the pectoralis major, that differ in one or more of these characteristics across sex and species, suggesting they are specialized for faster contraction and greater force production in male manakins. These muscles normally function to raise and lower the wings during flight. As this movement is the principal motion of the wingsnap, these adaptations presumably underlie the performance of the wingsnap display.
Starting Page	677
Ending Page	684
Page Count	8
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	187
Issue Number	9
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-10-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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