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Macroalgal growth: Local and global ...

Teichberg, Mirta Carolina.

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Macroalgal growth: Local and global comparisons of nutrient limitation and assimilation.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Macroalgal growth: Local and global comparisons of nutrient limitation and assimilation./
作者:	Teichberg, Mirta Carolina.
面頁冊數:	158 p.
附註:	Adviser: Ivan Valiela.
Contained By:	Dissertation Abstracts International68-04B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3259894

Macroalgal growth: Local and global comparisons of nutrient limitation and assimilation.
Teichberg, Mirta Carolina.

Macroalgal growth: Local and global comparisons of nutrient limitation and assimilation. - 158 p.

Adviser: Ivan Valiela.

Thesis (Ph.D.)--Boston University, 2007.

Increased nutrient loading to coastal waters leads to eutrophication and macroalgal blooms worldwide. Macroalgal blooms in turn lead to increased anoxia, decline of seagrasses, corals, and commercially important species. Increased supply of limiting nutrients is a major stimulant for macroalgal growth, so it is relevant to ask how changes in nutrient supply set the stage for blooms of macroalgae along different coasts of the world. To assess nutrient limitation and assimilation in common bloom-forming macroalgae on a broad range of geographic settings, climates, and nutrient regimes, I carried out in situ nutrient enrichment experiments in Cape Cod, MA, Puerto Rico, Mexico, Brazil, Argentina, Portugal, and Italy.Subjects--Topical Terms:

1017726
Biology, Ecology.

Macroalgal growth: Local and global comparisons of nutrient limitation and assimilation.
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502 $a Thesis (Ph.D.)--Boston University, 2007.
520 $a Increased nutrient loading to coastal waters leads to eutrophication and macroalgal blooms worldwide. Macroalgal blooms in turn lead to increased anoxia, decline of seagrasses, corals, and commercially important species. Increased supply of limiting nutrients is a major stimulant for macroalgal growth, so it is relevant to ask how changes in nutrient supply set the stage for blooms of macroalgae along different coasts of the world. To assess nutrient limitation and assimilation in common bloom-forming macroalgae on a broad range of geographic settings, climates, and nutrient regimes, I carried out in situ nutrient enrichment experiments in Cape Cod, MA, Puerto Rico, Mexico, Brazil, Argentina, Portugal, and Italy.
520 $a Growth of macroalgae in Waquoit Bay, Cape Cod was N-limited, and influenced by the form of inorganic N, suggesting species-specific differences in the mechanisms involved in N uptake and assimilation. Response of Ulva lactuca was similar with nitrate and ammonium enrichment, and greater where ambient nitrate supply was higher, while growth response of Gracilaria tikvahiae was greater with ammonium enrichment where ambient ammonium supply was higher. Both macroalgae exhibited rapid assimilation of nitrate and ammonium and N turnover, with a higher affinity for ammonium. The ability of U. lactuca to use both nitrate and ammonium was reflected by high activity rates of nitrate reductase and glutamine synthetase, enzymes involved in N assimilation.
520 $a Contrary to the belief that the most common limiting nutrient is N in temperate coasts and P in tropical coasts, results from the geographic comparison study indicated that ambient nutrient supply rather than latitude determined which nutrient was responsible for controlling algal growth. The global response of Ulva spp. to nutrients was strongly influenced by the ambient N and P regime; coastal waters rich in N created conditions where P supply restricted macroalgal blooms, and vice-versa. Because of the locally specific responses to ambient conditions, remediation of macroalgal blooms should consider ambient nutrient regimes, and management should be targeted towards reducing land-derived inputs of the limiting nutrient.
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