کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8470228 1549922 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
How are endemic and widely distributed bromeliads responding to warming temperatures? A case study in a Brazilian hotspot
ترجمه فارسی عنوان
چطور بملی ها به شدت در معرض درجه حرارت گرم قرار می گیرند؟ یک مطالعه موردی در یک نقطۀ برزیلی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی
The increase in mean global temperature is causing extensive changes in ecosystems. However, little is yet known about the heat tolerance of neotropical plant species. Here, we investigate heat tolerance variation in both restricted and widely distributed bromeliad species co-occurring in campo rupestre, a megadiverse ecosystem in central and eastern Brazil. We determined the heat tolerance of the photosynthetic apparatus using chlorophyll fluorescence measurements to test if the endemic species Vriesea minarum is more heat sensitive than two widely distributed species, Vriesea bituminosa and Aechmea nudicaulis. Furthermore, we tested if the distinct photosynthetic metabolisms of the species, sun exposure, and rainfall seasonality of campo rupestre influence this outcome. Our results show that, contrary to our expectations, the endemic campo rupestre species did not show the greatest heat sensitivity, but did have one of the lowest heat tolerance plasticities. The CAM bromeliad A. nudicaulis was more heat tolerant than the other bromeliad species, but both heat tolerance and its plasticity are highly affected by sun exposure and the rainfall seasonality of campo rupestre. The low values and plasticity of V. minarum thermal tolerance could indicate that the threat of global warming could be greater for this campo rupestre endemic species. Our results also indicate that heat tolerance, especially the ability to withstand stressful temperatures for a long time, is an important parameter that differentiates the ecological strategies of these bromeliads species.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Volume 238, January 2018, Pages 110-118
نویسندگان
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