Related Experiment Video
Updated: Mar 24, 2026
07:20
Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea
Published on: September 5, 2018
8.5K
Complex spatial and temporal variation of subtropical benthic macrofauna under sewage impact
F M Souza1, K M Brauko2, E R Gilbert1
1Centro de Estudos do Mar, Universidade Federal do Paraná, 83255-976 Pontal do Paraná, Paraná, Brazil.
Marine Environmental Research
|March 20, 2016
Summary
Understanding temporal variability in benthic macrofauna is crucial for accurate ecological assessments. This study highlights rapid changes in sewage-impacted subtropical tidal flats, emphasizing the need for fine-scale temporal monitoring.
Area of Science:
- Marine Ecology
- Benthic Ecology
- Environmental Science
Background:
- Sewage contamination significantly impacts coastal ecosystems.
- Benthic macrofauna are key indicators of ecosystem health.
- Subtropical tidal flats experience complex environmental dynamics.
Purpose of the Study:
- To investigate spatial and temporal variation in sewage-impacted benthic macrofauna.
- To identify key environmental factors influencing benthic communities.
- To assess the significance of short-term temporal changes in ecological interpretations.
Main Methods:
- Application of a five-factor linear model.
- Analysis of spatial scales: Contaminated/Non-Contaminated sites, Tidal Flat, Plot.
- Analysis of temporal scales: Season and Fortnight.
Main Results:
- Contaminated sites showed elevated coprostanol and Paranais cf frici, indicating organic enrichment.
- Seasonal differences were significant, with lower species richness and abundance in summer.
- Strong interactions between Fortnight and Tidal Flat revealed high within-flat heterogeneity.
- Benthic communities exhibited significant changes over short time scales.
Conclusions:
- Benthic community composition is highly dynamic, even at small spatial and temporal scales.
- Rapid temporal fluctuations can obscure true variation sources and lead to misinterpretations.
- Comprehensive monitoring of benthic temporal variability is essential for robust ecological assessments.
Related Concept Videos
01:30Marine Microbial Ecology
14
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...
14
01:18Deep Sea Microbial Ecology
12
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
12
01:25Microbial Mats
21
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
21
01:24Freshwater Microbial Ecology
16
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...
16