ArticleJournal of comparative physiology. B, Biochemical, systemic, and environmental physiology2026
Histomorphometric plasticity in pectoral muscles and adipose tissue of Redheaded Bunting in response to skeleton photoperiod.
Article in Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Synchronization to the environmental day-night cycle is the key to survival in many animals. For a photoinduced physiological response to occur, Critical Daylength (CD) is required for that species. Some studies have shown changes in pectoral muscles and adipose tissue of migratory birds under the influence of 'Continuous light Pulse' (CP) photoperiodic schedules, but data under the influence of 'Skeleton Photoperiod' (SKP) is still lacking. Two groups of Redheaded Buntings were exposed to SKPs along with one group on shortday control, to test their effects on histological changes via histomorphometric analysis of pectoral muscle fibers and adipose tissue. The SKP groups were designed such that one tended to be photosensitive, while the other tended to be photostimulatory. The tissues of interest were cryosectioned and stained with either haematoxylin-eosin or oil red-O (ORO) stain. Thereafter, microscopy and imaging were done. We measured pectoral muscle fiber thickness, neutral lipid droplet size in muscle fibers, adipocyte area, adipocyte number density/ 1000 µm
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