Trophic level index
In today's world, Trophic level index has been a topic that has generated a lot of interest and debate. Whether due to its historical relevance, its impact on current society or its influence in different areas, Trophic level index has captured the attention of many. From its emergence to the present, Trophic level index has raised a wide range of opinions and has been the subject of numerous studies and research. In this article, we will explore in depth the different aspects related to Trophic level index, analyzing its importance, its implications and its evolution over time.
The trophic level index (TLI) is used in New Zealand as a measure of nutrient status of lakes. It is similar to the trophic state index but was proposed as alternative that suited New Zealand.
The system uses four criteria, phosphorus and nitrogen concentrations, as well as visual clarity and algal biomass weighted equally.
| Lake type | Trophic level | Chla (mg m−3) | Secchi depth (m) | TP (mg P m−3) | TN (mg N m−3) |
|---|---|---|---|---|---|
| Ultra-microtrophic | 0-1 | 0.13-0.33 | 31-24 | 0.84-1.8 | 16-34 |
| Microtrophic | 1-2 | 0.33-0.82 | 24-15 | 1.8-4.1 | 34-73 |
| Oligotrophic | 2-3 | 0.82-2.0 | 15-7.8 | 4.1-9.0 | 73-157 |
| Mesotrophic | 3-4 | 2.0-5.0 | 7.8-3.6 | 9.0-20 | 157-337 |
| Eutrophic | 4-5 | 5.0-12 | 3.6-1.6 | 20-43 | 337-725 |
| Supertrophic | 5-6 | 12-31 | 1.6-0.7 | 43-96 | 725-1558 |
| Hypertrophic | 6-7 | >31 | <0.7 | >96 | >1558 |
See also
External links
- New Zealand Ministry for the Environment - Trophic Level Index for lakes
- Definitions of the 5 trophic states - Oligotrophic, Mesotrophic, Eutrophic, Supertrophic and Hypertrophic lakes
References
- ^ New Zealand Ministry for the Environment Archived 2010-05-22 at the Wayback Machine - Trophic Level Index for lakes
- ^ Burns, Noel; Graham Bryers; Eddie Bowman (March 2000). Protocol for Monitoring Trophic Levels of New Zealand Lakes and Reservoirs. Retrieved 9 May 2017.
- ^ Burns, Noel; McIntosh, John; Scholes, Paul (2005). "Strategies for Managing the Lakes of the Rotorua District, New Zealand". Lake and Reservoir Management. 21 (1): 61–72. doi:10.1080/07438140509354413. S2CID 86767838.
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