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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 Interactions: Predation

Microbial Interactions: Predation

Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...

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...

Overview of Algae

Overview of Algae

The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...

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...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Fluorescently Labeled Bacteria as a Tracer to Reveal Novel Pathways of Organic Carbon Flow in Aquatic Ecosystems

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El pastoreo bacteriano por las algas planctónicas del lago.

D F Bird, J Kalff

Science (New York, N.Y.)

|January 31, 1986

Resumen

Las especies de algas de los lagos ingieren bacterias a un ritmo comparable al de los microflagelados marinos. Ciertas algas, como el Dinobryon, son importantes consumidores de bacterias en los ecosistemas acuáticos.

Área de la Ciencia:

Ecología acuática ecología acuática.
Microbiología Microbiología.
Limología Limología.

Sus antecedentes:

Las bacterias son un componente clave de las redes alimenticias acuáticas.
Las algas generalmente se consideran productores primarios, pero algunas pueden consumir otros organismos.
El papel de las algas en el consumo de bacterias dentro de los ecosistemas de agua dulce no se entiende completamente.

Objetivo del estudio:

Para investigar las capacidades de ingestión bacteriana de las especies comunes de algas de los lagos.
Para comparar las tasas de ingestión bacteriana de algas con las de otros microorganismos acuáticos.
Evaluar el impacto general de algas específicas en las poblaciones bacterianas en el agua de los lagos.

Principales métodos:

Cultivo de seis especies comunes de algas de los lagos.

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Cuantificación de las tasas de ingestión bacteriana por las algas.

Comparación de las tasas de eliminación de bacterias por las algas frente al zooplancton (crustáceos, rotiferos, ciliados).

Principales resultados:

Se confirmó que seis especies comunes de algas de los lagos ingieren bacterias.
Las tasas de ingestión de algas observadas fueron similares en magnitud a las de los microflagelados marinos.
Una biomasa significativa de las especies Dinobryon eliminó las bacterias de manera más efectiva que una combinación de crustáceos, rotiferos y ciliados.

Conclusiones:

Ciertas especies de algas de los lagos son capaces de un consumo significativo de bacterias.
Las algas, particularmente Dinobryon, pueden desempeñar un papel sustancial en la regulación de las poblaciones bacterianas en entornos de agua dulce.
Este hallazgo pone de relieve un vínculo trófico previamente subestimado en los ecosistemas lacustres.