کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4429930 1619842 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large-scale patterns of epiphytic lichen species richness: Photobiont-dependent response to climate and forest structure
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Large-scale patterns of epiphytic lichen species richness: Photobiont-dependent response to climate and forest structure
چکیده انگلیسی

Lichens are composite organisms consisting of a symbiotic association of a fungus with a photosynthetic partner. Although the photobiont type is a key life-history trait, tests of the potential differential role of the main photobiont types in shaping large-scale patterns of lichen species richness are still absent. The aim of the study was to test the influences of forest structure and climate on epiphytic lichen species richness across Italy and to see whether these relationships change for groups of species sharing different photobiont types. Regional species richness of epiphytic lichens divided into three main photobiont types (i.e. chlorococcoid green algae, cyanobacteria, and Trentepohlia algae) was retrieved for each of the 20 administrative regions. Multiple linear regression was used to quantify the effect of climate and forest structure, and their potential interaction, on the regional species richness for the three photobiont types, accounting also for the effect of regional area. Regional species richness was associated with both climate and forest structure variables but the relationships with both factors were largely photobiont dependent. Regional area and precipitation were the only predictors included in all the models, confirming the strong dependence of lichens on atmospheric water supply, irrespective of the photobiont type. Number of species with chlorococcoid green algae were further positively associated with cover of high forest, whilst lichens with Trentepohlia were further enhanced by warm temperatures. Cyanolichen species richness was only related to area and precipitation. Our study shed light on the relative importance of climate and forest structure on lichen species richness patterns at the macroscale, showing a differential response of the photobiont types to various environmental determinants. This differential response suggested that the current and future impacts of global change on lichens cannot be generalized and that species richness response will be likely dependent on the photobiont type.


► Lichen species richness response to environmental change is photobiont dependent.
► Lichen species richness of all photobiont types is positively related to rainfall.
► Forest coppicing is detrimental for lichens with chlorococcoid green algae.
► Cyanolichen species richness is positively associated only to rainfall.
► Species richness of lichens with Trentepohlia is enhanced by warming temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 409, Issue 20, 15 September 2011, Pages 4381–4386
نویسندگان
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