Aquatic macroinvertebrates in Uruguayan rice agroecosystem

Area of Science:

• Ecology
• Entomology
• Agroecosystem Science

Background:

• Rice agroecosystems are vital agricultural landscapes.
• Understanding aquatic macroinvertebrate communities is crucial for assessing water quality.
• Limited data exists on invertebrate biodiversity in Uruguayan rice production systems.

Purpose of the Study:

• To conduct a preliminary assessment of insect and aquatic macroinvertebrate communities in rice agroecosystems in eastern Uruguay.
• To explore the potential of these communities as indicators of water quality in rice-producing regions.
• To establish baseline data for future ecological studies in Uruguayan rice fields.

Main Methods:

• Sampling was conducted during the grain-filling stage in insecticide-free rice crops across three locations in the Treinta y Tres Department.
• Aquatic macroinvertebrates were collected using a Surber-type net at water inlets and outlets of paddy fields and adjacent control areas.
• Morphospecies composition was analyzed to understand community structure in relation to location and water source.

Main Results:

• Insecta was the dominant class, comprising 41.5% of all sampled macroinvertebrates.
• Diptera (59.9%), Hemiptera (16.3%), and Ephemeroptera (14.0%) were the most abundant insect orders.
• Higher Richness and Shannon Diversity Indices were observed compared to similar studies in Costa Rica, Italy, and Australia.

Conclusions:

• The composition of aquatic macroinvertebrates in Uruguayan rice agroecosystems offers insights into associated water quality.
• Insect biodiversity in these Uruguayan rice fields is notably high, exceeding levels found in comparable international studies.
• This research establishes a foundational understanding of macroinvertebrate communities in Uruguayan rice systems, highlighting their ecological significance.