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Related Concept Videos

Osmoregulation in Fishes02:32

Osmoregulation in Fishes

When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
Keystone Species01:39

Keystone Species

Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
What is Conservation Biology?01:57

What is Conservation Biology?

Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials.
Sustainable Development01:43

Sustainable Development

As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
Marine Microbial Ecology01:30

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 Ecology01:24

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...

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Related Experiment Video

Updated: Jul 13, 2026

Necropsy-based Wild Fish Health Assessment
07:57

Necropsy-based Wild Fish Health Assessment

Published on: September 11, 2018

Ecology. Can science rescue salmon?

C C Mann, M L Plummer

    Science (New York, N.Y.)
    |August 19, 2000
    PubMed
    Summary

    The National Marine Fisheries Service (NMFS) introduced a plan to aid endangered Columbia River salmon, focusing on habitat restoration and hatchery improvements. Dam breaching on the Snake River remains an option pending the effectiveness of these initial measures.

    Area of Science:

    • Fisheries Management
    • Conservation Biology
    • River Ecology

    Background:

    • Endangered salmon populations in the Columbia River face significant threats.
    • The National Marine Fisheries Service (NMFS) has developed a comprehensive recovery plan.
    • The plan addresses habitat restoration, hatchery reforms, harvest limits, and river flow improvements.

    Discussion:

    • The NMFS plan prioritizes less drastic measures over immediate dam breaching on the Snake River.
    • This approach aims to assess the efficacy of habitat and flow improvements before considering more extreme interventions.
    • The decision to defer dam breaching has generated strong reactions from various stakeholders.

    Key Insights:

    • A multi-faceted approach is being implemented to bolster salmon recovery.

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  • Habitat restoration and hatchery overhauls are central components of the new strategy.
  • The controversial issue of Snake River dam breaching is being temporarily set aside.

    • Outlook:

    • The success of the current plan will determine if further actions, including dam breaching, are necessary.
    • Continued monitoring of salmon populations and ecosystem health is crucial.
    • Stakeholder engagement and adaptive management will be key to long-term salmon recovery efforts.