Results 31 to 40 of about 203,020 (279)

Assessment of Productivity Status Using Carlson’s TSI and Fish Diversity of Goronyo Dam, Sokoto State, Nigeria [PDF]

open access: yes, 2018
Goronyo Dam is the largest lentic waterbody in Sokoto, it was constructed to serve as flood control and used for irrigation activities. The study was conducted to evaluate productivity status and fish diversity of Goronyo Dam in 2016.
Magami, Ibrahim Muhammad   +2 more
core   +3 more sources

Reductions in the dietary niche of southern sea otters (Enhydra lutris nereis) from the Holocene to the Anthropocene. [PDF]

open access: yes, 2020
The sea otter (Enhydra lutris) is a marine mammal hunted to near extinction during the 1800s. Despite their well-known modern importance as a keystone species, we know little about historical sea otter ecology.
Elliott Smith, Emma A   +7 more
core   +1 more source

Evaluation of the Trophic Level of Kune and Vain Lagoons in Albania, Using Phytoplankton as a Bioindicator

open access: yesJournal of Sustainable Development of Energy, Water and Environment Systems, 2014
Concentration of chlorophyll is an adequate parameter for assessing the trophic state of lagoon ecosystems. Objectives of this study are: selection of a system of bioindicators to enable a good qualitative evaluation of the trophic state of the lagoons ...
Anni Koci Kallfa   +2 more
doaj   +1 more source

Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain [PDF]

open access: yesNeotropical Ichthyology
Landscape change caused by hydropower dam construction and invasion of agriculture in the riparian zone has been a catalyst for alterations in fish food web dynamics.
Vinícius de Andrade Urbano   +3 more
doaj   +1 more source

Distinct age and landscape influence on two reservoirs under the same climate [PDF]

open access: yes, 2003
With the purpose of finding out whether different landscape occupation could affect water quality in two reservoirs of distinct age and subjected to the same climatic influence, several factors were investigated in a study lasting from January 2000 ...
Boavida, Maria José   +1 more
core   +1 more source

Trophic State: A Useful Scale for Classifying Lakes Based on Biological Productivity

open access: yesEDIS
Lakes are diverse and come in all shapes and sizes. The Trophic State Classification System allows people to group waterbodies into one of four categories, called “trophic states,” based on their level of biological productivity.
Elizabeth Moreau, Gretchen Lescord
doaj   +1 more source

Nitrogen is unlikely to consistently limit primary productivity in most tropical lakes

open access: yesEcosphere, 2023
Despite mounting evidence that tropical lakes may experience an array of phytoplankton nutrient limitation regimes, references to low‐latitude lakes being predominantly nitrogen limited remain common in the literature. To assess the current understanding
Jemma M. Fadum, Ed K. Hall
doaj   +1 more source

Diversity of mollusc communities in some aquatic habitats of Shatsk Lake Area

open access: yesБіологічні студії, 2022
Background. The paper presents the results of an original research on groups of freshwater molluscs in some water habitats of Shatsk Lake Area. The Shatsk National Nature Park belongs to the Volynian Polissia according to physical and geographical zoning.
I. Koltun, I. Khamar
doaj   +1 more source

Monitoring Water Quality of Valle de Bravo Reservoir, Mexico, Using Entire Lifespan of MERIS Data and Machine Learning Approaches

open access: yesRemote Sensing, 2020
Remote-sensing-based machine learning approaches for water quality parameters estimation, Secchi Disk Depth (SDD) and Turbidity, were developed for the Valle de Bravo reservoir in central Mexico. This waterbody is a multipurpose reservoir, which provides
Leonardo F. Arias-Rodriguez   +4 more
doaj   +1 more source

Evaluating the influence of lake morphology, trophic status and diagenesis on geochemical profiles in lake sediments [PDF]

open access: yes, 2010
Recent geochemical studies provide evidence that changes in vertical distributions of nutrients in lake sediments are driven by anthropogenic activities, based primarily on trends of increasing concentrations in upper sediment layers.
Hamilton, David P.   +2 more
core   +2 more sources

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