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7 results for “hatch date”
Figure 3 in Colonization, hatching dates, and growth rates of juvenile Hyporhamphus picarti (Hemiramphidae), in the Nador lagoon (NE Morocco)
Figure 3. - Mean monthly air temperature (°C) at Nador during 2012 and 2013. (X) indicate water temperature at each sampling date in 2012 and 2013.
Figure 1 in Colonization, hatching dates, and growth rates of juvenile Hyporhamphus picarti (Hemiramphidae), in the Nador lagoon (NE Morocco)
Figure 1. - The Nador lagoon and location of the six sampling stations. Black arrows indicate the hourly sense of the water flow in the lagoon. White arrows indicate the main freshwater inputs. Some geographical features cited in the text are indicated.
Data from: Shifts in hatch dates do not provide pied flycatchers with a rapid ontogenetic route to adjust offspring time schedules to climate change
1. Environments change rapidly, and it is unclear whether organisms with complex life-styles, such as avian migrants, are able to adjust sufficiently. For understanding human impacts on ecosystem functioning, it is crucial to understand how well, and by which mechanisms species are able to adapt. 2. To improve the understanding of migrants' ability to adjust their annual timing to climate change, we investigated ontogenetic hatch date effects on adult spring migration timing and female egg laying dates. We experimentally delayed hatch dates of pied flycatchers Ficedula hypoleuca by one week in three breeding seasons by delaying incubation onset. We investigate if natural and experimental (shifts in) hatch date affected timing of recruiting individuals up to at least three years after the manipulation. 3. Spring arrival dates were positively correlated to natural variation in hatch dates in three of the five years considered, but no such effects were found in egg laying. Experiments showed that delayed hatching resulted in delayed arrival and laying only in one-year old and not in older birds. These effects were mostly observed during one of the study years. 4. The discrepancy between experimental and natural hatch date effects indicate that a causal hatch date effect is not generally responsible for the correlation between hatch date and timing during adulthood. Instead, we propose that natural hatch date effects on spring arrival arise from genetic variation in migration schedules, while delays in hatching induced carry-over effects on arrival and laying dates in offspring (e.g. the experimental effect in 2010). Strong support for year-specific expression of hatch date and delay effects on time schedules imply that trait-variation can be easily obscured. The latter may explain the lack of hatch date effects on female egg laying. 5. Our results imply that plasticity in breeding phenology does not provide pied flycatchers with a non-genetic inheritance route to rapidly advance annual cycles. Instead, plasticity may rather masks (genetic) trait-variation for selection to act on, and thereby slow down micro-evolutionary adaptation to changing environments.
Data from: Shifts in hatch dates do not provide pied flycatchers with a rapid ontogenetic route to adjust offspring time schedules to climate change
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Does hatch date set the clock? Timing of post-fledging movements for families of a colonially breeding, long-distance migratory songbird
<p><span>Factors that influence the development of migration timing in juvenile songbirds have implications for the ability of individuals to respond positively to rapid environmental changes. We investigated the impacts of nest timing on the post-fledging movement timing of juveniles and adults of a migratory songbird. We tested whether first egg date and environmental factors predicted the initiation of post-fledging stages: fledge date for juveniles, and colony departure date for both adults and juveniles. At breeding colonies of purple martin (<i>Progne subis</i>) in southern Ontario, Canada, we monitored nests to determine the date of nest initiation ('first egg date') and deployed 122 coded radio-frequency tracking tags on young and adults to determine the timing of post-fledging stages. We found that first egg date, the number of nestmates and age of parents were the main predictors of fledge date. Of these three factors, only first egg date was carried through post-fledge to influence colony departure date for juvenile birds, but this relationship weakened between first egg date and departure date. Nestmates tended to fledge together (range 0-4 days) but exhibited greater variation in colony departure timing (range 0-11 days). Further, while first egg influenced departure date, increasing variation between fledge and departure led to some birds departing breeding colonies at a younger age, suggesting in influence of local environmental factors (e.g. social or photoperiod change) in departure decisions. The timing of adult colony departure date was independent of first egg dates. In sum, our results suggest a role for 1<sup>st</sup> egg dates in setting timing of post-breeding movements, but with variation introduced between fledge and departure dates. Experimental manipulations of photoperiod in a wild setting are needed and future research should investigate whether the timing of movement driven by nesting timing, holds across the rest of migration or even the lifetime of birds. </span></p>
Does hatch date set the clock? Timing of post-fledging movements for families of a colonially breeding, long-distance migratory songbird
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Data from: Hatching date influences winter habitat occupancy: examining seasonal interactions across the full annual cycle in a migratory songbird
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