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Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Green Algae

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

Other Algae

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...

Marine Microbial Ecology

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...

Freshwater Microbial Ecology

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...

Microbial Wastewater Treatment

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.

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Video Experimental Relacionado

Updated: Jul 11, 2026

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout (Salvelinus namaycush) from Its Prey

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Published on: August 29, 2014

Influencia alelopática en la secuencia de floración azul-verde en un lago eutrófico.

Science (New York, N.Y.)

|May 20, 1977

Resumen

Las floraciones de algas azul-verdes en el estanque de Linsley estaban vinculadas a sus propios filtrados libres de células. Estos filtrados actuaron como probióticos y antibióticos, influyendo en la dinámica de la población de flores durante tres años.

Área de la Ciencia:

Limología Limología.
Microbiología Microbiología.
Ecología Ecología Ecología.

Sus antecedentes:

Los lagos eutróficos experimentan florecimientos estacionales de algas, principalmente de algas azul-verdes.
Comprender los factores que regulan la sucesión de las flores es crucial para la gestión del lago.
Las interacciones de las algas, incluida la señalización química, juegan un papel importante en la dinámica de la floración.

Objetivo del estudio:

Para investigar el papel de los filtrados libres de células de las algas dominantes azul-verdes en la regulación de las secuencias de floración.
Para determinar si estos filtrados exhiben efectos probióticos o antibióticos en otras algas.
Para correlacionar la actividad de los filtrados con los cambios en la población de flores in situ en Linsley Pond.

Principales métodos:

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Recopilación y análisis del agua de Linsley Pond durante un período de tres años.
Aislamiento de las algas dominantes azul-verdes y preparación de cultivos axénicos o unialgal.
Preparación y aplicación de filtrados libres de células de estos aislados.
Monitoreo de la dinámica de la población de algas y correlación con los efectos del filtrado.

Principales resultados:

Se observó una fuerte correlación entre la secuencia de floración y los efectos de los filtrados libres de células de algas.
Los filtrados térmicamente sensibles demostraron actividades tanto probióticas como antibióticas.
El ascenso y caída de las poblaciones de floración de algas azules verdes in situ se correspondía con la actividad del filtrado.

Conclusiones:

Los filtrados libres de células de las algas azules verdes dominantes influyen significativamente en la sucesión de la floración en los lagos eutróficos.
Estos filtrados actúan como mediadores químicos clave, regulando las poblaciones de algas a través de mecanismos probióticos y antibióticos.
Los hallazgos destacan la importancia de la ecología química intraalgal en la dinámica de floración de Linsley Pond.