کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8847058 1617856 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Two Mediterranean annuals feature high within-population trait variability and respond differently to a precipitation gradient
ترجمه فارسی عنوان
دو ساله های مدیترانه ای از ویژگی های متغیرهای درون جمعیتی برخوردار هستند و به شیوه ی بارندگی متفاوت عمل می کنند
کلمات کلیدی
تغییر آب و هوا، محیط زیست کاربردی، ارتفاع گیاه، تنش خشکی، گرادیان بارش، رابطه زیست محیطی، سازگاری محلی، پلاستیک فنتیکی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی
Intraspecific trait variability plays an important role in species adaptation to climate change. However, it still remains unclear how plants in semi-arid environments respond to increasing aridity. We investigated the intraspecific trait variability of two common Mediterranean annuals (Geropogon hybridus and Crupina crupinastrum) with similar habitat preferences. They were studied along a steep precipitation gradient in Israel similar to the maximum predicted precipitation changes in the eastern Mediterranean basin (i.e. −30% until 2100). We expected a shift from competitive ability to stress tolerance with decreasing precipitation and tested this expectation by measuring key functional traits (canopy and seed release height, specific leaf area, N- and P-leaf content, seed mass). Further, we evaluated generative bet-hedging strategies by different seed traits. Both species showed different responses along the precipitation gradient. C. crupinastrum exhibited only decreased plant height towards aridity, while G. hybridus showed strong trends of generative adaptation to aridity. Different seed trait indices suggest increased bet-hedging of G. hybridus in arid environments. However, no clear trends along the precipitation gradient were observed in leaf traits (specific leaf area and leaf N-/P-content) in both species. Moreover, variance decomposition revealed that most of the observed trait variation (≫50%) is found within populations. The findings of our study suggest that responses to increased aridity are highly species-specific and local environmental factors may have a stronger effect on intraspecific trait variation than shifts in annual precipitation. We therefore argue that trait-based analyses should focus on precipitation gradients that are comparable to predicted precipitation changes and compare precipitation effects to effects of local environmental factors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Basic and Applied Ecology - Volume 25, December 2017, Pages 48-58
نویسندگان
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