کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4528425 | 1324306 | 2008 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The importance of grazing intensity and frequency for physiological responses of the tropical seagrass Thalassia hemprichii
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The importance of grazing intensity and frequency for physiological responses of the tropical seagrass Thalassia hemprichii The importance of grazing intensity and frequency for physiological responses of the tropical seagrass Thalassia hemprichii](/preview/png/4528425.png)
چکیده انگلیسی
Seagrass grazing is an intrinsic disturbance in primarily tropical and subtropical areas. While there is a general parabolic response in seagrass growth to grazing intensity, there is less knowledge on the role of grazing frequency, as well as potential interactions between grazing intensity and frequency. This study experimentally investigated physiological responses in Thalassia hemprichii to simulated (leaf cutting) grazing regimes with different intensities (25% vs. 75%) and frequencies (1 times vs. 3 times) over 35 days in Chwaka Bay (Zanzibar, Tanzania). The results showed that the two high-intensity treatments (75% removal) had 37-41% lower growth rate than the low-intensity/low-frequency treatment, and rhizome sugar and starch content were both affected in a similar way. A 36% lower starch content in the simulated low-intensity/high-frequency regime (25%Â ÃÂ 3) compared to the one of low-intensity/low-frequency (25%Â ÃÂ 1) also shows an interaction between grazing intensity and frequency. This suggests that high-intensity (and to some extent frequency) grazing regimes, in comparison to low-intensity regimes, could negatively affect T. hemprichii growth, energy reserves, and thereby the ability to deal with additional stress like light limitation or grazing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 89, Issue 3, October 2008, Pages 337-340
Journal: Aquatic Botany - Volume 89, Issue 3, October 2008, Pages 337-340
نویسندگان
J.S. Eklöf, M. Gullström, M. Björk, M.E. Asplund, L. Hammar, A. Dahlgren, M.C. Ãhman,