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their food supplies has changed . North American wood warblers winter in the tropics. Their spring departure for breeding grounds is controlled by photoperiod, which may help time their stopovers with food peaks en route to and their arrival on breeding grounds. Two longterm datasets indicate that these warblers have not advanced their arrival dates but that leaf production and caterpillar development are occurring earlier in the spring than previously. Therefore, as food resources advance with local warming, breeding of these warblers is becoming increasingly out of synchrony with their food supply . As noted previously, information on the population variation in laying dates would be helpful in assessing the meaning of the advancement of laying dates. In an intensive examination of laying dates of 962 clutches of mountain whitecrowned sparrows breeding at 2900 m in the Sierra Nevada of California, the date of clutch starts ranged over 76 days. The mean onset of the first 10 clutches of the summer varied over 41 days . These data indicate that, even in a highly seasonal environment dominated by snow cover for eight to nine months of the year, populational variation is very high and should be measured in future studies on

the thunder rolls and the lightnin strikes lightning bolt retro shirt 1
the thunder rolls and the lightnin strikes lightning bolt retro shirt 1

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