Cold fronts and reservoir limnology: an integrated approach towards the ecological dynamics of freshwater ecosystems.

نویسندگان

  • J G Tundisi
  • T Matsumura-Tundisi
  • K C Pereira
  • A P Luzia
  • M D Passerini
  • W A C Chiba
  • M A Morais
  • N Y Sebastien
چکیده

In this paper the authors discuss the effects of cold fronts on the dynamics of freshwater ecosystems of southeast South America. Cold fronts originating from the Antarctic show a monthly frequency that promotes turbulence and vertical mixing in reservoirs with a consequence to homogenize nutrient distribution, dissolved oxygen and temperature. Weak thermoclines and the athelomixis process immediately before, during and after the passage of cold fronts interfere with phytoplankton succession in reservoirs. Cyanobacteria blooms in eutrophic reservoirs are frequently connected with periods of stratification and stability of the water column. Cold fronts in the Amazon and Pantanal lakes may produce fish killings during the process of "friagem" associated mixing events. Further studies will try to implement a model to predict the impact of cold fronts and prepare management procedures in order to cope with cyanobacteria blooms during warm and stable water column periods. Changes in water quality of reservoirs are expected during circulation periods caused by cold fronts.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Using Landscape Limnology to Classify Freshwater Ecosystems for Multi-ecosystem Management and Conservation

Governmental entities are responsible for managing and conserving large numbers of lake, river, and wetland ecosystems that can be addressed only rarely on a case-by-case basis. We present a system for predictive classification modeling, grounded in the theoretical foundation of landscape limnology, that creates a tractable number of ecosystem classes to which management actions may be tailored...

متن کامل

Promoting the integration of Engineering, Ecology and Limnology: the Ecohydrological approach applied to Amazon reservoir construction.

Amazon watersheds are a complex ecosystem: the interaction between terrestrial and aquatic ecosystems and the water level fluctuations are the main forcing function that regulates the biodiversity, the evolutionary processes and the interaction between terrestrial and aquatic biota in the large internal deltas, the extensive floodplains regions and the network of channels, creeks, rivers, meand...

متن کامل

Regional-scale risk assessment methodology using the Relative Risk Model (RRM) for surface freshwater aquatic ecosystems in South Africa

To maximise the long-term use of limited ecosystem services in South Africa, managers continually require approaches to optimise the establishment of balances between the use and protection of ecosystems to ensure sustainability. Surface freshwater aquatic ecosystems are dynamic and difficult to manage effectively. Sound management protocols that can identify and rank threats to these ecosystem...

متن کامل

Water Resources Management in the South of Kerman Province Using the System Dynamics Model

Integrated water resources management is recognized as one of the main needs of any society due to population growth and technological advancement. To implement integrated water resources management, modeling of this system is essential. On the other hand, water resources systems are highly complex and affected by various factors that are very difficult to identify and determine their role in w...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Brazilian journal of biology = Revista brasleira de biologia

دوره 70 3 Suppl  شماره 

صفحات  -

تاریخ انتشار 2010