کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4545957 1327479 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inter-strain differences in nitrogen use by the coccolithophore Emiliania huxleyi, and consequences for predation by a planktonic ciliate
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Inter-strain differences in nitrogen use by the coccolithophore Emiliania huxleyi, and consequences for predation by a planktonic ciliate
چکیده انگلیسی

Four strains of the coccolithophore Emiliania huxleyi (CCMP strains 370, 373, 374, 379) were tested for their ability to grow on various nitrogen sources. All strains grew on ammonium, nitrate, and urea, although growth of CCMP379 on urea was low. Responses to other dissolved organic nitrogen (DON) sources varied. CCMP379 did not grow on any DON source other than urea. All other strains grew on one of the two tested amino acids: CCMP370 and CCMP373 on glutamine, and CCMP374 on alanine. All three of these strains also grew on hypoxanthine; in addition, two grew well on acetamide and one on ethanolamine. E. huxleyi strains also differed in their susceptibility to predation by the ciliate Strobilidium sp. CCMP374 was ingested at substantially higher rates than CCMP373 regardless of E. huxleyi growth condition. Ciliate feeding rates also depended on E. huxleyi growth condition. For CCMP374, feeding rates were 2× higher on growing E. huxleyi cells than on non-growing cells (average 27.5 versus 15.6 cells ciliate−1 h−1, respectively). For CCMP373, a relationship between E. huxleyi growth rate and ciliate feeding rate was not evident, but E. huxleyi grown on some N sources (ammonium, nitrate, urea) were ingested at consistently higher rates than E. huxleyi grown on other sources (ethanolamine, glutamine). Interstrain differences in the ability to utilize DON and resist predation may contribute to maintenance of high genetic diversity within this cosmopolitan, bloom-forming species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Harmful Algae - Volume 8, Issue 5, June 2009, Pages 811–816
نویسندگان
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