کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4372952 1617138 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Morphology-based functional groups as effective indicators of phytoplankton dynamics in a tropical cyanobacteria-dominated transitional river–reservoir system
ترجمه فارسی عنوان
گروه های عاملی مبتنی بر مورفولوژی به عنوان شاخص موثر پویایی فیتوپلانکتون در یک سیستم انتقالی رودخانه و مخزن-سیانوباکتری تحت سلطه گرمسیری
کلمات کلیدی
شاخص های زیست محیطی؛ اتروفیکاسیون؛ طبقه بندی کاربردی؛ جلبک شکوفه مضر. طبقه بندی تاکسونومیکی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• We tested different classifications as predictors of phytoplankton in an impacted system.
• Morphology-based functional groups (MBFG) best explained phytoplankton communitý responses.
• Morphology captured efficiently eco-strategies of bloom-forming cyanobacteria.
• MBFG approach can be used to monitor the development of HABs in temporal and spatial scales.

Cyanobacteria dominance is often associated with economic, ecological and health problems. The potential production of toxic compounds calls for frequent monitoring of cyanobacteria and their toxin production in many aquatic systems. Methods to simplify this process and facilitate management responses to sudden environmental changes are needed to improve the capability of risk-assessment. We tested the effectiveness of two different functional approaches (Functional Groups – FG, Reynolds et al., 2002; and Morphology-Based Functional Groups – MBFG, Kruk et al., 2010) as well as single species and taxonomic classifications as the best proxy of spatio-temporal phytoplankton dynamics and dominance of toxic algae in an impacted transitional river–reservoir system in the tropics. The Paraíba do Sul River and Funil Reservoir are located in one of the most heavily impacted regions of Brazil, and the latter system has a history of intense, long-lasting toxic cyanobacteria blooms. Sampling was conducted over the two climatological periods of the region: warm-rainy (October/2011 and January/2012) and cold-dry (July/2011 and May/2012), with stations in the following areas: tributary, reservoir and river (downstream from the dam). Our results showed that the MBFG classification was the most effective approach, i.e., best explained the response of the phytoplankton community to environmental variations. Environmental factors including light, nutrients, water temperature and hydrology increased the occurrence of different MBFGs on both spatial and temporal scales. The lotic areas showed a more diverse composition of MBFGs, including species with high to moderate tolerance to light limitation and flushing conditions (MBFGs I, III, IV, V and VI). In Funil Reservoir, phytoplankton biovolume was dominated by bloom-forming cyanobacteria (MBFGs III and VII) and remained high throughout the study. This dominance was related to the overall eutrophic conditions, low light availability and increased water-column stability of the reservoir. The seasonal dynamics in the reservoir was mainly related to changes in temperature and hydrology. Our results show for the first time that morphology captures efficiently eco-strategies of bloom-forming cyanobacteria and the MBFG approach can be used to predict and monitor the development of cyanobacteria HABs in temporal and spatial scales.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Indicators - Volume 64, May 2016, Pages 217–227
نویسندگان
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