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Markus Neuhäuser, Auteur ; L. Scott Johnson, Auteur ; Brian S. Masters, Auteur ; Scott K. Sakaluk, Auteur ; Charles F. Thompson, Auteur
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Markus Neuhäuser, Auteur ; L. Scott Johnson, Auteur ; Brian S. Masters, Auteur ; Scott K. Sakaluk, Auteur ; Charles F. Thompson, AuteurMale-biased offspring sex ratios have been associated with extra-pair mating in some bird species. This has been interpreted as evidence of adaptive sex allocation by females in response to securing sperm from high-quality males. Here, we propos[...]
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L. Scott Johnson, Auteur ; Katherine M. Iser, Auteur ; Haley A. Molnar, Auteur ; Andre V. Nguyen, Auteur ; Chelsea L. Connor, AuteurHow avian reproductive behavior changes at high elevations, and whether changes are the result of adaptation or constraint remains unclear. We compared clutch and egg sizes in two populations of Tree Swallows (Tachycineta bicolor), one at an ele[...]
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L. Scott Johnson, Auteur ; Andre V. Nguyen, Auteur ; Chelsea L. Connor, AuteurWhat causes young birds to leave nests remains unclear for almost all altricial species. For many years, the assumption was that parents often controlled the time of fledging by coaxing young from nests, e.g., by holding food within view, but ou[...]
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L. Scott Johnson, Auteur ; Chelsea L. Connor, Auteur ; Andre V. Nguyen, AuteurIn many bird species, only females incubate the eggs, but both sexes feed nestlings. The means by which males of such species discover hatching and transition to feeding their offspring remains almost completely unexplored. Of particular interes[...]
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Erin L. O'Brien, Auteur ; Brian L. Morrison, Auteur ; L. Scott Johnson, AuteurWe compared haematocrits and blood haemoglobin concentrations of nestling House Wrens Troglodytes aedon in nests with relatively large numbers of haematophagous larvae of the blow fly Protocalliphora parorum (> 6.4 large larvae/nestling) and nes[...]
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L. Scott Johnson, Auteur ; Jessica L. Brubaker, Auteur ; Emilene Ostlind, Auteur ; Susan L. Balenger, AuteurMale investment of time and energy in caring for offspring varies substantially both between and within bird species. Explaining this variation is of long-standing interest to ornithologists. One factor that may affect male care is breeding site[...]
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L. Scott Johnson, Auteur ; Jessica L. Brubaker, Auteur ; Bonnie G. P. Johnson, Auteur ; Brian S. Masters, AuteurFemale birds are hypothesized to mate outside the pairbond to secure alleles that enhance the fitness potential of their offspring. To test this, researchers typically compare fitness-related attributes of extra-pair (EP) and within-pair (WP) ha[...]
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Susan L. Balenger, Auteur ; L. Scott Johnson, Auteur ; Herman L. Mays, Auteur ; Brian S. Masters, AuteurSexual selection theory posits that ornamental traits can evolve if they provide individuals with an advantage in securing multiple mates. That male ornamentation occurs in many bird species in which males pair with a single female is therefore [...]
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L. Scott Johnson, Auteur ; Shannon M. Murphy, Auteur ; Gordon W. Parrish, AuteurRecent studies suggest that songbirds have a better sense of smell than initially suspected. Work is now focused on determining how birds use their sense of smell to enhance survival and reproduction. One question is whether birds use smell to d[...]
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L. Scott Johnson, Auteur ; Rachel M. Hebert, Auteur ; Felicia M. Napolillo, Auteur ; Allison Allen, AuteurFledging is a critical event in the avian breeding cycle, but remains unstudied in almost all species. As a result, little is known about factors that cause nestlings to leave nests. We documented fledging behavior in a box-nesting population of[...]
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Michael J. Newhouse, Auteur ; Peter P. Marra, Auteur ; L. Scott Johnson, Auteur
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L. Scott Johnson, Auteur ; Felicia M. Napolillo, Auteur ; Dovid Y. Kozlovsky, Auteur ; Rachel M. Hebert, Auteur ; Allison Allen, AuteurFemales in many bird species reportedly begin incubation prior to clutch completion, but the nature of such incubation and the degree to which it varies among females remains undescribed for almost all species. We used continuous recording of ne[...]
