Objectives. 1. To develop and test a survey approach that will permit many square meters of lake bottom to be examined within minutes, thereby greatly increasing the ability to detect the presence and estimate the abundance of Hexagenia nymphs compared to conventional sediment grab sampling. Abstract: A remotely operated vehicle (ROV) was employed in August 2 3 to survey hundreds of square meters of the bottom of Lake Erie at several stations. The objective was to test the feasibility of using a ROV to detect and quantify the abundance of Hexagenia (burrowing mayfly) nymphs in areas where they are present but in such low numbers that typical grab sampling methods are ineffective. Analysis of videotapes of the lake bottom, ground-truthed with Ponar grab samples of the sediment, indicates that the ROV effectively detects the presence of Hexagenia burrow holes in areas where grab samples have a small chance of sampling the nymphs. Analysis of the quantitative value of the videotapes is continuing.
- Development of Great Lakes Environmental Indicators Based on Amphibians
- Integrated Economic Development and Environmental Protection Assessment for Muskegon River Watershed.
- How do Plant Species Invasions Affect Water Quality Services Performed by Great Lakes Coastal Wetlands?
- Development of an Index of Biotic Integrity for Great Lakes Coastal Wetlands
- Development of a Method for Predicting the Bioavailability and Mobility of Persistent and Bioaccumulative Toxic Organic Contaminants in Great Lakes Sediment
- Is the thyroid status of wild-fish impaired in the Great Lakes' Areasof Concern?
- Genetic and environmental factors influencing Microcystis bloom toxicity
- The Air-Surface Exchange of Speciated Mercury Over Agricultural Crops and Soils
- Impact of PBDEs on Canadian Environment/ Determination of Physical chemical Properties of POPs
- TCDD and PCB 126-Induced Proliferation of Maxillary and Mandibular Squamous Epithelia
Annex
General
Monitoring
Aquatic Nuisance Species
Annex
- Annex Numbers
Annex NumbersSurveillance and Monitoring
- Annex 17