Linear programming the Ramsar convention's criterion IV (case study: Shadegan Wetland, West Asia)

Area of Science:

• Environmental Science
• Ecological Modeling
• Conservation Biology

Background:

• Wetland ecosystems offer vital services but face degradation, threatening their status as protected sites.
• The Shadegan Wetland, designated a Ramsar site in 1975, is listed on the Montreux Record due to environmental changes.
• Maintaining ecological integrity is crucial for wetlands, especially those recognized under international conventions.

Purpose of the Study:

• To assess the status of Criterion IV of the Ramsar Convention in the Shadegan Wetland using linear programming (LP).
• To develop and verify an LP model for evaluating wetland conditions and identifying critical periods.
• To inform sustainable management strategies for the Shadegan Wetland and support its Ramsar site re-nomination.

Main Methods:

• Criterion IV of the Ramsar Convention was defined using mathematical language and modeled in Excel.
• Lingo software was used to verify the LP model with constraints based on climatic extremes and variable trends.
• Proxy variables (X variables) were established considering energy and water limitations.

Main Results:

• The year 2015 was identified as the most critical year within the 2001-2019 study period, indicated by the lowest Z index value (-0.36).
• In 2015, the bird population reached 50,000, significantly higher than the 20-year average of approximately 37,000 birds.
• The LP model effectively identified critical periods and provided insights into effective interventions for sustainable wetland use.

Conclusions:

• Linear programming is a valuable tool for assessing wetland health and supporting conservation efforts.
• Identifying critical years like 2015 is essential for targeted management interventions in the Shadegan Wetland.
• The study provides a framework for utilizing LP to aid in the re-nomination and sustainable management of Ramsar sites.