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2 results for “Molt divide”
Data for: Lower survival of hybrid grosbeaks, but not towhees, suggests a molt divide disfavors hybrids
<p>Although avian hybrid zones in the Great Plains have been studied for almost 70 years, we know surprisingly little about the fitness costs for hybrids that keep these zones narrow. We compare age ratios in grosbeaks (<em>Pheucticus ludovicianus</em> and <em>P. melanocephalus</em>) and towhees (<em>Pipilo erythropthalums</em> and <em>P. maculatus</em>), two species pairs that differ in their life-histories and molt schedules, to evaluate survival between hybrids and parentals. We then contrast molt and migratory divides as possible sources of selection against hybrids. Hybrid grosbeaks had 27-33% lower survival relative to their parentals, whereas hybrid towhees had survival rates similar to parentals. Age ratio data for hybrid grosbeaks suggest high mortality in older birds, as expected if selection operates after the first year of life. This pattern is consistent with parental species of grosbeaks having contrasting molt schedules relative to migration, suggesting high mortality costs to hybrids driven by molt biology, which are expressed later in life. Contrasts in molt schedules are absent in towhees. While migratory divides may exist for towhees and grosbeaks, the low adult survival of hybrid grosbeaks suggests that molt may be an important and underappreciated source of selection maintaining this and other narrow avian hybrid zones.</p>
Data for: Lower survival of hybrid grosbeaks, but not towhees, suggests a molt divide disfavors hybrids
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