کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4385916 | 1304553 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The spatial extent of termite influences on herbivore browsing in an African savanna
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
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چکیده انگلیسی
Termite mounds form islands of fertility in savanna landscapes and create foraging hotspots for herbivores, but the magnitude and spatial extent of these influences is unknown. We mapped terrain, termite mound and woody vegetation three-dimensional (3-D) structure at 56Â cm resolution across a large-scale (254Â ha), long-term (34 years) herbivore exclusion experiment in the Kruger National Park, with the Carnegie Airborne Observatory (CAO). We compared vegetation 3-D structure in areas protected from herbivores with those accessible to herbivores, both on termite mounds and in the landscape matrix between termite mounds. Termite mound density was 1.1Â haâ1 across the study area and mound size did not differ between protected and accessible areas. Woody vegetation canopy cover was â¼100% greater on protected than accessible mounds, but was only â¼20% greater in the protected inter-mound matrix when compared to the accessible matrix. Woody canopy height class distributions differed significantly between protected and accessible areas, with the tallest vegetation (>10Â m) occurring on protected termite mounds. The impacts of herbivore browsing were evident at distances of up to 20Â m from termite mound centres. Spatial analysis of mound distribution revealed that the sphere of termite mound influence constitutes â¼20% of the total landscape. Termite influences on herbivore browsing operate at scales much larger than the spatial extent of their mound building activities.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biological Conservation - Volume 143, Issue 11, November 2010, Pages 2462-2467
Journal: Biological Conservation - Volume 143, Issue 11, November 2010, Pages 2462-2467
نویسندگان
Shaun R. Levick, Gregory P. Asner, Ty Kennedy-Bowdoin, David E. Knapp,