The phenology and clutch size of UK Blue Tits does not differ with woodland composition

The deciduous tree-herbivorous caterpillar-insectivorous bird food chain is a well-studied system for investigating the impacts of climate change across trophic levels. To date, across Europe, most attention has focused on the impacts of increasing spring temperature on changes to phenology in Oak-dominated (Quercus spp.) woodlands. Paridae species and Pied Flycatcher Ficedula hypoleuca are the most studied secondary consumers, all of which demonstrate an advancement in reproductive phenology with increases in spring temperature. Shifts in climate and phenology may also impact on reproductive investment in clutch size, and the effects of climate on phenology and clutch size may vary depending on woodland composition. To date, the effects of among-habitat variation in phenology and reproductive investment have received little attention. Insectivorous birds inhabiting woodlands that differ in tree composition may differ in the timing of breeding, due to local tree leafing phenology acting as a cue for egg-laying date and/or clutch size. Moreover, for most insectivorous birds, woodland composition within a territory is likely to be the main determinant of food availability for both adults and chicks. Consequently, if warming springs affect the temporal patterns of food availability differently across different woodland compositions, this may affect the optimal average local phenology for nesting birds. Here, using data from 34 long-term (mean 15 years) nest monitoring sites across the UK, we investigate the effect of woodland tree composition and temperature on Blue Tit Cyanistes caeruleus first egg date (FED) and clutch size. We supplemented the nest monitoring data by quantifying woodland composition, at a site level, through modified point counts. We predict that birds breeding in woodlands with greater proportions of late-leafing species, such as Oak and Ash Fraxinus excelsior, will breed later than those breeding in woodlands with greater proportions of early-leafing species, such as Birch Betula spp. and Beech Fagus sylvatica. We found no evidence for differences in Blue Tit FED or clutch size in relation to the proportion of any of the tree species investigated, after controlling for temperature and latitude (FED: −3.4 and 2.2, clutch size: −0.4 and − 0.2 eggs for one-unit increase in temperature and latitude, respectively). In recent decades and across all sites, clutch size has decreased as spring temperatures have increased, a strategy which could allow birds flexibly to adjust their breeding phenology such that nestling demand coincides with peak food availability. The lack of an effect of woodland composition on Blue Tit phenology suggests Blue Tits do not fine-tune their reproductive phenology to the local tree composition. Whether this lack of evidence for phenological divergence is due to an absence of divergent selection on breeding phenology and clutch size or to gene flow is not clear

Relation of Income and Education Level with Cardiorespiratory Fitness

International Journal of Exercise Science 8(3): 265-276, 2015. While there is strong evidence measuring the association between leisure time physical activity (LTPA) and socioeconomic status (SES) there are limited data on the relationship between cardiorespiratory fitness (CRF) and SES. The purpose of this cross-sectional study was to examine differences in CRF and LTPA between household income and individual education in young adults. A sample of 171 (males n=98, female n=73) young adults participated in the University of Pittsburgh-Physical Activity Study. Participants completed CRF testing. Demographic characteristics were assessed via interviewer administered standardized survey and LTPA was assessed using the interviewer administered Modifiable Activity Questionnaire. Participants were grouped by income and education level. Analysis of variance and general linear modeling was used to compare LTPA and CRF between groups. There were no differences in CRF between income levels (p=0.126) or education levels (p=0.990) for the total sample. There were no differences in LTPA between income levels (p=0.936) or education level (p=0.182) for the total sample. Results suggest that neither income nor education levels are indicators of CRF in this sample of young adults. Other environmental, sociological, or familial health mediators may have a strong effect on CRF in young adult males and females

The Grizzly, March 25, 1986

The Day U.C. Shut Down • R.A. Selections Underway • Suggestions Being Taken for Forum Topics • Letter: Proud Parents Commend U.C.\u27s Talent • Learn to Swim • New Course for Lifeguards • BreMiller\u27s Diversified Interests • What are You Doing After Graduation? • Matthews an NEH Grant Recipient • Briefs: USGA Represented at Leadership Conference; Ray Bunt Honored at Luncheon; Science Fair in Helfferich; Senior Symposium Topics; Women\u27s Track • Men\u27s Lacrosse Club Starts New Season • Bears Even Record • Lady Bears Look to Win it all • Women\u27s Lacrosse to Begin • Gymnasts Deserted by Coach Morrison • A Reminiscent Backflip • Woody\u27s Hannah a Hit • Equipment Donatedhttps://digitalcommons.ursinus.edu/grizzlynews/1161/thumbnail.jp