Related Experiment Video
Updated: May 27, 2026
14:44
Field Collection and Laboratory Maintenance of Canopy-Forming Giant Kelp to Facilitate Restoration
Published on: June 7, 2024
Legacy effects of canopy disturbance on ecosystem functioning in macroalgal assemblages
1Marine Ecology Research Group, School of Biological Sciences, University of Canterbury, Christchurch, New Zealand. taitl@science.oregonstate.edu
Plos One
|November 9, 2011
Summary
Macroalgal canopy loss significantly reduces primary productivity for years, impacting nearshore ecosystems. These vital marine forests show low resilience to disturbances, affecting biodiversity and nutrient cycling.
Area of Science:
- Marine Ecology
- Phycology
- Ecosystem Productivity
Background:
- Macroalgal assemblages are highly productive and crucial for nearshore ecosystems.
- Anthropogenic impacts like sedimentation, eutrophication, and climate change threaten these habitats.
- The long-term effects of macroalgal canopy loss on primary productivity remain understudied.
Purpose of the Study:
- To investigate legacy effects of habitat-forming macroalgal (Fucales) canopy loss on primary productivity.
- To construct a chronosequence of disturbed macroalgal communities using experimental removal plots.
- To assess primary productivity in relation to biomass, density, and taxa richness.
Main Methods:
- Experimental removal of dominant Fucales species in intertidal zones.
- In situ photo-respirometry to measure primary productivity of algal assemblages.
- Comparison of control plots with long-term (up to 90 months) canopy removal plots.
Main Results:
- Mid-tidal removal plots showed 40-60% lower primary productivity than controls after 90 months.
- Low-shore removal plots exhibited at least 50% less primary productivity, persisting for 90 months.
- Reduced productivity was linked to lower fucoid biomass, density, and decreased taxa richness in removal plots.
Conclusions:
- Macroalgal assemblages demonstrate low resilience to major canopy loss events.
- Long-term reductions in primary productivity can negatively impact surrounding communities and nutrient cycling.
- The loss of dominant fucoid species has persistent, detrimental effects on ecosystem function.
Related Concept Videos
02:26Ecological Disturbance
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
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...
02:17Ecological Succession
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
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...
01:39Keystone 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...
01:26Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...