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• W2108282765 endingPage "98" @default.
• W2108282765 startingPage "98" @default.
• W2108282765 abstract "<span style=font-family: 'Times New Roman'; color: #221e1f;>Our study investigates the nature of the climate signal in three populations of the Arctic dwarf-shrub <em>Cassiope tetragona </em>using dendrochronological and stable isotope analysis techniques. We present 15 new <em>C. tetragona </em>chronologies from three sites (Axel Heiberg, Bathurst, and Devon islands) in the eastern Canadian Arctic, of which three are the first continuous stable carbon isotope ratio (δ¹³C) time series developed for Arctic shrubs. Correlation and multivariate regression analyses revealed that multiple and different climate factors influenced the chronologies within and between the three sites. At the Axel Heiberg Island site, the dominant climatic influences over annual stem elongation were previous year (t-1) and current year (t) summer precipitation, while annual production of flower buds was influenced by (t) winter precipitation and spring temperature. At Bathurst Island, annual production of flower buds responded to (t-1) growing season sunshine hours and winter precipitation and to (t) late growing season temperature and moisture availability. Our analysis of the Axel </span><span style=font-family: 'Times New Roman'; color: black;>H</span><span style=font-family: 'Times New Roman'; color: #221e1f;>eiberg and Bathurst Island models revealed the positive influence on δ</span><span style=font-family: 'Times New Roman'; color: #221e1f;>13</span><span style=font-family: 'Times New Roman'; color: #221e1f;>C values of (t-1) winter temperature—and on </span><span style=font-family: 'Times New Roman'; color: black;>B</span><span style=font-family: 'Times New Roman'; color: #221e1f;>athurst Island only, of (t-1) spring sunshine hours. The combined influence of these parameters on spring moisture availability suggests that the δ</span><span style=font-family: 'Times New Roman'; color: #221e1f;>13</span><span style=font-family: 'Times New Roman'; color: #221e1f;>C ratios varied in response to stomatal conductance. At Devon Island, the δ</span><span style=font-family: 'Times New Roman'; color: #221e1f;>13</span><span style=font-family: 'Times New Roman'; color: #221e1f;>C values varied in response to (t) and (t-1) spring and summer temperature and spring and fall solar radiation, which in turn influence the rate of photosynthesis. Our study supports the emerging hypothesis that Arctic shrubs are sensitive to climate. </span><span style=font-family: 'Times New Roman'; color: black;>H</span><span style=font-family: 'Times New Roman'; color: #221e1f;>owever, strong spatial variation in plant-climate response characterized our sampling sites. </span><span style=font-family: 'Times New Roman'; color: black;>T</span><span style=font-family: 'Times New Roman'; color: #221e1f;>his variation may be linked to site sensitivity, or regional climate variability due to geographic and topographic differences, or both. </span>" @default.
• W2108282765 created "2016-06-24" @default.
• W2108282765 creator A5009663412 @default.
• W2108282765 creator A5074473836 @default.
• W2108282765 creator A5083138705 @default.
• W2108282765 date "2011-03-09" @default.
• W2108282765 modified "2023-10-14" @default.
• W2108282765 title "Spatial Variability of the Dominant Climate Signal in <i>Cassiope tetragona</i> from Sites in Arctic Canada" @default.
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