منابع مشابه
Microbes in tree swallow semen.
A frequently hypothesized but poorly studied cost of multiple mating in birds is that exposure to pathogenic sexually transmitted microbes (STM's) can lower reproductive success. Conversely, female birds may benefit from high frequencies of copulation and multiple copulation partners if they receive cloacal inoculations of beneficial STM's that can either protect them against future encounters ...
متن کاملTree swallow reproductive investment, stress, and parasites
We reduced or increased tree swallow, Tachycineta bicolor (Vieillot, 1808), clutch sizes by three eggs (50% of modal clutch size) to test experimentally for relationships between stress and parasite loads. In the first year of the study (1996), we enumerated two measures of stress (granulocyte to non-granulocyte ratios and heterophil to lymphocyte ratios), blood parasites, and ectoparasites liv...
متن کاملSpecies for Christmas Tree Planting in Virginia*
Christmas trees can be grown through out the state, and growers are located in all regions. Se lec tion of the proper species, however, is important. Soil conditions and gen er al climate are the primary considerations influencing species selection, but other characteristics, such as con sum er pref er ence, species characteristics and require ments, condition of the planting site, and the pres...
متن کاملTranscontinental migratory connectivity predicts parasite prevalence in breeding populations of the European barn swallow.
Parasites exert a major impact on the eco-evolutionary dynamics of their hosts and the associated biotic environment. Migration constitutes an effective means for long-distance invasions of vector-borne parasites and promotes their rapid spread. Yet, ecological and spatial information on population-specific host-parasite connectivity is essentially lacking. Here, we address this question in a s...
متن کاملTime of breeding and female condition affect chick-growth in the Chilean Swallow (Tachycineta meyeni)
We analysed growth of nestling Chilean Swallows (Tachycineta meyeni) over four consecutive breeding seasons and determined the factors that explain variation in growth rate, asymptotic body mass and length of the nestling period. As the breeding season advanced nestlings grew more slowly and attained lower asymptotic mass, but the length of the nestling period and nestling survival did not show...
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ژورنال
عنوان ژورنال: The Auk
سال: 1897
ISSN: 0004-8038,1938-4254
DOI: 10.2307/4068487