کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6305680 | 1306976 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cyanobacterial blooms in Lake Atitlan, Guatemala
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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: Cyanobacterial blooms in Lake Atitlan, Guatemala Cyanobacterial blooms in Lake Atitlan, Guatemala](/preview/png/6305680.png)
چکیده انگلیسی
Lake Atitlan, one of the most important lakes not only in Central America but in the whole world, is facing serious problems with increasing water pollution. Over the last several decades, the uncontrolled nutrient input into the lake has lead to high P levels and low N:P ratios, initiating cyanobacterial blooms. The first bloom occurred in December of 2008, followed by more extensive bloom in October 2009. The blooms are formed by cyanobacteria from the rare planktic Lyngbya hieronymusii/birgei/robusta complex. Based on the species morphology, the Atitlan population corresponds to L. robusta and this is the first case of reported bloom of this species worldwide. Remote sensing images documented that at the maximum bloom development, 40% of the 137 km2 of the lake area were covered by dense patches of Lyngbya, with the chlorophyll a concentration reaching over 100 μg Lâ1. The only toxins detected in the 2009 bloom were trace levels of cylindrospermopsin and saxitoxin with 12 and 58 ng gâ1, respectively. The nitrogen fixation followed a pattern expected in non-heterocytous cyanobacteria, i.e., the nitrogenase activity was minimal during the day, while during the night the activity reached 2.2 nmol C2H4 μg Ch aâ1 hâ1. Delta 15N of â0.86â° was well in the range given for nitrogen fixing organisms. The cell C, N and P content was 36.7%, 5.9% and 0.9%, respectively, resulting in the molar ratio of 105:14.4:1. A well designed and executed lake monitoring program, strict control of nutrient input into the lake, and public education are the necessary prerequisites for potential prevention of even more severe blooms than the one from 2009.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Limnologica - Ecology and Management of Inland Waters - Volume 41, Issue 4, December 2011, Pages 296-302
Journal: Limnologica - Ecology and Management of Inland Waters - Volume 41, Issue 4, December 2011, Pages 296-302
نویسندگان
EliÅ¡ka Rejmánková, JiÅà Komárek, Margaret Dix, Jaroslava Komárková, Nancy Girón,