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5 results for “biparental incubation”
The effect of ambient temperature on bird embryonic development: A comparison between uniparental incubating silver-throated tits and biparental incubating black-throated tits
<p>The temperature experienced by avian embryos during development has important impacts on their growth and post-hatching phenotypes. Ambient temperature can directly affect avian nest temperature and indirectly affect it through its impact on parental incubation behaviours. Because the nests of uniparental incubators are usually left unattended more frequently than the nests of biparental incubators whose nests can be attended by another bird when one bird leaves the nest, we predict that the effect of ambient temperature on nest temperature and thus on embryonic development (specifically, incubation period length and hatching success) and post-hatching phenotype (i.e. potential carry-over effect on nestling body mass and condition) should be greater in uniparental incubators than in biparental incubators. To test this prediction, we studied two congeneric species, the biparental incubating black-throated tits (<em>Aegithalos concinnus</em>) and the uniparental incubating silver-throated tits (<em>A.</em> <em>glaucogularis</em>). We found that although the two species' embryos both developed faster (shorter incubation period length) when ambient temperature was higher, the slope was significantly greater for silver-throated tits than for black-throated tits, consistent with our prediction of a greater effect of ambient temperature on embryonic development in silver-throated tits. However, the result was not due to a greater effect of ambient temperature on nest temperature because nest temperatures of the two species had positive relationships with ambient temperature in a similar way. Therefore, it implies a greater response of silver-throated tit embryos to temperature change. In addition, ambient temperature during the incubation stage did not affect either hatching success or nestling body mass and condition in both species. Although our predictions were not fully supported, our findings highlight the different responses of embryonic development to environmental changes between a uniparental incubator and a biparental incubator and suggest further research to explore the mechanisms.</p>
The effect of ambient temperature on bird embryonic development: A comparison between uniparental incubating silver-throated tits and biparental incubating black-throated tits
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Data from: Biparentally incubating Aegithalos concinnus (Black-throated Tit) provide a more stable nest thermal environment than uniparentally incubating A. glaucogularis (Silver-throated Tit)
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Data from: Biparental incubation patterns in a high-Arctic breeding shorebird: how do pairs divide their duties?
In biparental species, parents may be in conflict over how much they invest into their offspring. To understand this conflict, parental care needs to be accurately measured, something rarely done. Here, we quantitatively describe the outcome of parental conflict in terms of quality, amount and timing of incubation throughout the 21 day incubation period in a population of semipalmated sandpipers (Calidris pusilla) breeding under continuous daylight in the High Arctic. Incubation quality, measured by egg temperature and incubation constancy, showed no marked difference between the sexes. The amount of incubation, measured as length of incubation bouts, was on average 51 min longer per bout for females (11.5 h) than for males (10.7 h), at first glance suggesting that females invested more than males. However, this difference may have been offset by sex-differences in the timing of incubation; females were more often off-nest during the warmer period of the day, when foraging conditions were presumably better. Overall, the daily timing of incubation shifted over the incubation period (e. g., for female incubation from 'evening-night' to 'night-morning') and over the season, but varied considerably among pairs. At one extreme, pairs shared the amount of incubation equally, but one parent always incubated during the colder part of the day; at the other extreme, pairs shifted the start of incubation bouts between days so that each parent experienced similar conditions across the incubation period. Our results highlight how the simultaneous consideration of different aspects of care across time allows sex-specific investment to be more accurately quantified.
Data from: Biparental incubation patterns in a high-Arctic breeding shorebird: how do pairs divide their duties?
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