Related Experiment Video
Updated: Mar 1, 2026
05:04
Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management
Published on: July 14, 2023
809
Trophic functioning and nutrient flux in a highly productive tropical lagoon
Hsing-Juh Lin1, Jia-Jang Hung2, Kwang-Tsao Shao3
1Department of Botany, National Chung Hsing University, Taichung, Taiwan 402, Republic of China.
Oecologia
|May 27, 2017
Summary
Chiku Lagoon
Area of Science:
- Ecosystem ecology
- Aquatic biogeochemistry
- Fisheries science
Background:
- Chiku Lagoon exhibits high productivity and fishery yields.
- Understanding food web dynamics and nutrient cycling is crucial for explaining lagoon productivity.
Purpose of the Study:
- To construct trophic networks and nutrient budgets for Chiku Lagoon.
- To link food web functioning to nonconservative nutrient behavior and high fishery yields.
Main Methods:
- Network analysis of trophic interactions.
- Stoichiometric water-salt-nutrient budget calculations.
- Measurement of primary production and respiration rates.
Main Results:
- Phytoplankton are a primary food source, but detritivory dominates over herbivory.
- High fishery pressure reduces transfer efficiency at higher trophic levels.
- The lagoon acts as a significant sink for nitrogen and phosphorus, supporting high productivity.
Conclusions:
- High fishery yields in Chiku Lagoon are driven by nutrient loading-induced planktonic productivity.
- Straight-through food web pathways facilitate efficient energy transfer.
- The lagoon's biogeochemistry explains its high productivity and fishery potential.
Related Concept Videos
01:06Primary Production
25.8K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
25.8K
00:46Trophic Efficiency
25.6K
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
25.6K
01:35Trophic Levels
38.3K
All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.
38.3K
01:17What is an Ecosystem?
47.7K
Overview
47.7K
01:15Metabolism of Chemolithotrophs
1.0K
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
1.0K
02:32Osmoregulation in Fishes
54.0K
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?
54.0K