A5074542232- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Aquatic Ecosystems and Biodiversity
- Fish Ecology and Management Studies
- Water Quality and Pollution Assessment
- Fish biology, ecology, and behavior
- Additive Manufacturing and 3D Printing Technologies
- Vehicle License Plate Recognition
- Engineering Applied Research
- Metal Forming Simulation Techniques
- Textile materials and evaluations
- IoT-based Smart Home Systems
- Isotope Analysis in Ecology
- Aquaculture Nutrition and Growth
- Educational Robotics and Engineering
- Metallurgy and Material Forming
- Advanced Manufacturing and Logistics Optimization
- Assembly Line Balancing Optimization
- Mechanical Failure Analysis and Simulation
- Recycling and Waste Management Techniques
- Smart Parking Systems Research
- Metal Alloys Wear and Properties
- Fish Biology and Ecology Studies
- Welding Techniques and Residual Stresses
- Innovations in Concrete and Construction Materials
Universidade Federal do Rio Grande do Norte
2014-2024
Lund University
2001
Universidade Federal do Rio de Janeiro
1998
Abstract Aim Global patterns of temperature and precipitation have significantly changed over the last century nearly all predictions point to even greater changes by end 2100. Long periods drought in semi-arid regions generally reduce reservoirs lakes water level, increasing nutrients concentrations water. Our principal hypothesis is that volume reduction, driven prolonged droughts, will increase susceptibility eutrophication accordingly an trophic state. To test this hypothesis, we used a...
The response of zooplankton assemblages to variations in the water quality four man-made lakes, caused by eutrophication and siltation, was investigated means canonical correspondence analysis.Monte Carlo simulations using CCA eigenvalues as test statistics revealed that changes species composition along environmental gradients trophic state abiogenic turbidity were highly significant.Brachionus calyciflorus, Thermocyclops sp. Argyrodiaptomus good indicators eutrophic conditions, whereas B....
Abstract Nile tilapia, Oreochromis niloticus (L.), has been introduced in most tropical and subtropical regions of the world to improve inland fisheries aquaculture. This species is generally viewed as beneficial where introduced, but environmental impacts its widespread introductions are uncertain not well understood. In this study, a 30‐year time series records from reservoir was divided into five equal periods 6 years compared. The introduction tilapia did increase total...
Summary 1. Strong trophic cascades have been well documented in pelagic food webs of temperate lakes. In contrast, the limited available evidence suggests that strong are less typical tropical 2. To measure effects omnivorous tilapia on planktonic communities and water transparency a small man‐made lake, we performed 5‐week situ enclosure experiment with five densities fish randomly allocated to 20 enclosures. Zooplankton Phytoplankton biomasses as were measured weekly. 3. Results show...
Summary 1. The major aim of this study was to test the hypothesis that nutrient enrichment and introduction Nile tilapia ( Oreochromis niloticus ), an exotic omnivorous filter‐feeding fish, operate interdependently regulate plankton communities water transparency a tropical reservoir in semi‐arid northeastern Brazil. 2. A field experiment performed for 5 weeks 20 enclosures (9.8 m 3 ) which four treatments were randomly allocated: addition (F), (N), (F + N) control treatment with no or (C)....
The effects of planktivorous fish on lower trophic levels through predation zooplankton and nutrient excretion were experimentally separated their relative importance quantified in a eutrophic humic lake. experiment was performed 12 enclosures (3 m 3 ), which initially identical with respect to all components except fish. At the start experiment, caged not able feed added four (excretion treatment), free swimming plus treatment). Four left as controls. Samples for nutrients major groups...
The effects of planktivorous fish on phytoplankton through nutrient recycling and zooplankton herbivory were experimentally separated their relative importance quantified in a eutrophic humic lake. Natural assemblages incubated nutrient-permeable chambers placed inside enclosures with or without fish. Outside these chambers, exposed to by zooplankton, whereas the only consumers. Our results show that had significant positive cyanobacteria, cryptomonads, chlorophytes indicating fish-mediated...
Classical models of phytoplankton–zooplankton interaction show that with nutrient enrichment such systems may abruptly shift from limit cycles to stable phytoplankton domination due zooplankton predation by planktivorous fish. Such assume fish eat only zooplankton, but there are various species filter-feeding also feed on phytoplankton. Here, we extend these classical systematically explore the effects omnivory Our analysis indicates if forage in addition alternative attractors predicted...
The relationships between fish composition, connectivity and morphometry of 103 lagoons in nine freshwater ecoregions (FEOW) 2·83° S 37·64° were evaluated order to detect possible congruence the gradient species richness similarities assemblage composition. Most included study <2 km(2) , with a maximum 3975 surface area. Combined area all was 5411 . Number varied locally from one 76. A multiple regression revealed that latitude, attributes connectivity, sampling effort explained large amount...
Normal 0 21 false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400;...
The nitrogen and phosphorus content of two temperate fishes, Rutilus rutilus Perca fluviatilis , six tropical Oreochromis niloticus Cichla monoculus Serrassalmus rhombeus Plagioscion squamosissimus Prochilodus brevis Hoplias malabaricus were investigated to test the hypothesis that variation in body P N:P ratio is related size. Regressions %P ratios against fish size (length mass) confirmed for P. suggesting an important factor driving some fishes. Moreover, significant increases %N with was...
Normal 0 21 false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400;...