Related Experiment Video
Updated: Jun 18, 2026
13:38
Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
Smallest algae thrive as the Arctic Ocean freshens
William K W Li1, Fiona A McLaughlin, Connie Lovejoy
1Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS B2Y 4A2, Canada. LiB@mar.dfo-mpo.gc.ca
Science (New York, N.Y.)
|November 11, 2009
Summary
Climate change is shrinking Arctic phytoplankton. Smaller cells are favored, potentially reducing overall biological production and impacting food webs.
Area of Science:
- Oceanography
- Marine Biology
- Climate Science
Background:
- Arctic Ocean is warming and receiving increased freshwater.
- Ocean stratification impedes nutrient mixing to surface waters.
- Phytoplankton growth relies on nutrient availability.
Purpose of the Study:
- To investigate the impact of climate change on Arctic phytoplankton community structure.
- To determine if smaller phytoplankton cells are becoming more dominant.
- To assess the potential consequences for higher trophic levels.
Main Methods:
- Analysis of long-term observational data (since 2004) on phytoplankton and bacteria size distribution.
- Monitoring of oceanographic conditions, including temperature and salinity.
- Ecological modeling to predict future trends.
Main Results:
- Observed a significant increase in the abundance of small algae and bacteria.
- Documented a concurrent decrease in the proportion of larger algae.
- Evidence suggests a shift towards a smaller-celled phytoplankton community.
Conclusions:
- Warming Arctic waters favor smaller phytoplankton cells due to nutrient acquisition and reduced settling.
- This shift may lead to decreased primary productivity in the Arctic ecosystem.
- Potential negative impacts on higher trophic levels and the overall marine food web.
More Related Videos
14:38Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
Published on: April 20, 2012
11:08Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
Published on: January 7, 2019
Related Concept Videos
01:21Green 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...
01:19Other 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...
01:23Red Algae
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
01:28Overview 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...
01:30Marine 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...
01:24Freshwater 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...