The nature of fish communities: A factor influencing the fishery potential and yields of tropical lakes and reservoirs

Hydrobiologia ◽  
1982 ◽  
Vol 97 (2) ◽  
pp. 127-140 ◽  
Author(s):  
C. H. Fernando ◽  
J. Holčík
Keyword(s):  
Fish Communities ◽  
Tropical Lakes ◽  
Lakes And Reservoirs

Ecological influences of human population size and distance to urban centres on fish communities in tropical lakes

2018 ◽  
Vol 28 (5) ◽  
pp. 1030-1043 ◽  
Author(s):  
Friedrich Wolfgang Keppeler ◽  
Angela Castro de Souza ◽  
Gustavo Hallwass ◽  
Alpina Begossi ◽  
Morgana Carvalho de Almeida ◽  
...  
Keyword(s):  
Population Size ◽  
Human Population ◽  
Fish Communities ◽  
Tropical Lakes

scholarly journals Hydrodynamic and ecological 3D modeling in tropical lakes

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Lais F. Amorim ◽  
José Rodolfo Scarati Martins ◽  
Fabio F. Nogueira ◽  
Fabio P. Silva ◽  
Bárbara P. S. Duarte ◽  
...  
Keyword(s):  
Water Quality ◽  
High Frequency ◽  
3D Model ◽  
3D Models ◽  
Tropical Lakes ◽  
Hydrodynamic Behavior ◽  
Frequency Monitoring ◽  
Lakes And Reservoirs ◽  
Bed Material ◽  
Good Agreement

AbstractConservation and improvement of water quality in water bodies is an important matter to maintain all of its uses as well as other human necessities like microclimate regulation and leisure. Lakes and reservoirs have a complex circulation behavior with vertical temperature profiles changes along the time, resulting in differences in water density and a vertical stratification condition. This characteristic can directly affect the water quality conditions perturbing its main indicators. This study aims to evaluate the quasi-3D models' capacity to represent the hydrodynamic behavior of a tropical lake and its effects on the main variables that characterize its water quality. To achieve this objective, high-frequency monitoring data were collected, the lake was represented in a quasi-3D model, and the accuracy of the result was evaluated by applying statistical indices. The evaluation showed good agreement between field measures and simulated results when compared with other applications. The connections between hydrodynamic behavior and water quality were seen with the simulations results analysis, which showed that mixing events and long stratification periods perturb the water quality, the first with re-suspended bed material and the second blocking the surface and bottom exchanges. The application of a 3D model gives the capacity to reproduce the reservoir spatial variability and its vertical profiles, which is necessary to study the constituents' distributions across the water column. Therefore, the hydrodynamic and water quality behavior of lakes was accurately represented by the model, as well as the importance of improving high-frequency monitoring techniques.

Dissolved organic N in shallow tropical lakes and reservoirs: Contribution to total dissolved N and relationships with eutrophication

2019 ◽  
Vol 104 (5-6) ◽  
pp. 106-115 ◽  
Author(s):  
Iola Gonçalves Boëchat ◽  
Aparecida Beatriz das Mercês Paiva-Magela ◽  
Helbert Rocha Reis ◽  
Björn Gücker
Keyword(s):  
Tropical Lakes ◽  
Organic N ◽  
Lakes And Reservoirs ◽  
Dissolved Organic N

Non-native fishes homogenize native fish communities and reduce ecosystem multifunctionality in tropical lakes over 16 years

2021 ◽  
Vol 769 ◽  
pp. 144524
Author(s):  
Dieison André Moi ◽  
Diego Corrêa Alves ◽  
Bruno Renaly Souza Figueiredo ◽  
Pablo Augusto Poleto Antiqueira ◽  
Franco Teixeira de Mello ◽  
...  
Keyword(s):  
Fish Communities ◽  
Tropical Lakes ◽  
Native Fish ◽  
Native Fishes ◽  
Ecosystem Multifunctionality

scholarly journals Climatic Effects on Lake Basins. Part I: Modeling Tropical Lake Levels

2011 ◽  
Vol 24 (12) ◽  
pp. 2983-2999 ◽  
Author(s):  
Martina Ricko ◽  
James A. Carton ◽  
Charon Birkett
Keyword(s):  
Lake Level ◽  
Tropical Lakes ◽  
Freshwater Flux ◽  
Lake Area ◽  
Lake Levels ◽  
Seasonal Forecasts ◽  
Climatic Effects ◽  
Lakes And Reservoirs ◽  
Lake Systems ◽  
Observation Period

Abstract The availability of satellite estimates of rainfall and lake levels offers exciting new opportunities to estimate the hydrologic properties of lake systems. Combined with simple basin models, connections to climatic variations can then be explored with a focus on a future ability to predict changes in storage volume for water resources or natural hazards concerns. This study examines the capability of a simple basin model to estimate variations in water level for 12 tropical lakes and reservoirs during a 16-yr remotely sensed observation period (1992–2007). The model is constructed with two empirical parameters: effective catchment to lake area ratio and time delay between freshwater flux and lake level response. Rainfall datasets, one reanalysis and two satellite-based observational products, and two radar-altimetry-derived lake level datasets are explored and cross checked. Good agreement is observed between the two lake level datasets with the lowest correlations occurring for the two small lakes Kainji and Tana (0.87 and 0.89). Fitting observations to the simple basin model provides a set of delay times between rainfall and level rise ranging up to 105 days and effective catchment to lake ratios ranging between 2 and 27. For 9 of 12 lakes and reservoirs the observational rainfall products provide a better fit to observed lake levels than the reanalysis rainfall product. But for most of the records any of the rainfall products provide reasonable lake level estimates, a result which opens up the possibility of using rainfall to create seasonal forecasts of future lake levels and hindcasts of past lake levels. The limitations of the observation sets and the two-parameter model are discussed.

scholarly journals Seasonal variation of Microcystis aeruginosa and factors related to blooms in a deep warm monomictic lake in Mexico

2021 ◽  
Vol 80 (2) ◽  
Author(s):  
Eloy Montero ◽  
Gabriela Vázquez ◽  
Margarita Caballero ◽  
Mario E. Favila ◽  
Fernando Martínez-Jerónimo
Keyword(s):  
Seasonal Variation ◽  
Water Column ◽  
Microcystis Aeruginosa ◽  
Phytoplankton Community ◽  
Inorganic Nitrogen ◽  
Seasonal Dynamic ◽  
Cyanobacterial Blooms ◽  
Tropical Lakes ◽  
Eutrophic Lakes ◽  
Lakes And Reservoirs

The occurrence of cyanobacterial blooms has increased globally over the last decades, with the combined effect of climate change and eutrophication as its main drivers. The seasonal dynamic of cyanobacterial blooms is a well-known phenomenon in lakes and reservoirs in temperate zones. Nevertheless, in the tropics, most studies have been performed in shallow and artificial lakes; therefore, the seasonal dynamic of cyanobacterial blooms in deep and eutrophic tropical lakes is still under research. We studied the seasonal variation of the phytoplankton community and the factors associated with Microcystis aeruginosa blooms along the water column of Lake Alberca de Tacámbaro, a warm monomictic crater lake located in Mexico, during 2018 and 2019. According to previous studies performed in 2006 and 2010, this lake was mesotrophic-eutrophic, with Chlorophyta and Bacillariophyta as the dominant groups of the phytoplankton community. During 2018 and 2019, the lake was eutrophic and occasionally, hypertrophic, a phenomenon likely associated with the increase of farmland area around the lake. The dominant species was M. aeruginosa, forming blooms from the surface to 10 m depth in winter, in the hypolimnion in spring and summer, and along the full water column in autumn. These findings suggest that M. aeruginosa in Lake Alberca de Tacámbaro displays seasonal and spatial population dynamics. Total phosphorus, dissolved inorganic nitrogen, water temperature and photosynthetically active radiation were the environmental factors related to M. aeruginosa blooms. Our results suggest that the changes in the structure of the phytoplankton community through time, and M. aeruginosa blooms in Lake Alberca de Tacámbaro, are mainly related to changes in land use from forest to farmland in areas adjacent to the lake, which promoted its eutrophication in the last years through runoffs. Comparative studies with other deep and eutrophic lakes will allow us to gain a deeper understanding of the dynamic of cyanobacterial blooms in natural and artificial water reservoirs strongly stressed by human activities.

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