. The Canadian field-naturalist. 286 The Canadian Field-Naturalist Vol. 104 Caribbean Sea. Figure I. Areas in Suriname, Peru, Ecuador, and Costa Rica where collecting occurred. remains scarce south of the United States. To determine potential sources of this contamination, we explored the feasibility of cooperative studies in different areas of Latin America. The study's primary objective was to determine residue levels in migratory prey immediately after their arrival on the wintering grounds in the fall and just before their departure north in the spring. Secondary objectives included measur
. The Canadian field-naturalist. 286 The Canadian Field-Naturalist Vol. 104 Caribbean Sea. Figure I. Areas in Suriname, Peru, Ecuador, and Costa Rica where collecting occurred. remains scarce south of the United States. To determine potential sources of this contamination, we explored the feasibility of cooperative studies in different areas of Latin America. The study's primary objective was to determine residue levels in migratory prey immediately after their arrival on the wintering grounds in the fall and just before their departure north in the spring. Secondary objectives included measuring residue levels in resident prey, determining the quantity of pesticides used and their use patterns in each country, and assisting our cooperators by collecting and analyzing species of interest, , shrimp and food fish. Sampling Locations Suriname, situated on the northeast coast of South America, uses pesticides in the rice and fruit industries and in the control of malaria mosquitoes (Suriname agriculture officials, personal commun- ication) (Figure I). Numerous migrant shorebirds congregate in the shallow water of the coastal mangroves and feed at low tide on the extensive coastal mud flats (Spaans 1978). Peregrine Falcons, frequent winter residents, arrive from the north with these migrants and establish winter hunting territories, many in the mangroves and in adjacent towns and cities. Peru, the third largest nation in area in South America, has numerous rivers flowing from the Andes Mountains towards the Pacific Ocean, creating mudflats, sandy beaches, and coastal lagoons. Shorebirds feed in these areas as well as in sewage outflows near towns. In Ecuador, salt ponds back from the coastline, coastal lagoons, and the beach serve as feeding areas for migrating shorebirds. In Costa Rica the coastal mangrove areas, mud flats formed at river estuaries, lagoons back from the ocean, salt flats, and shrimp ponds provide feeding areas for migrant shorebirds, the majority o
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