Brainstorming meeting on environmental and other factors needed for evaluating and managing riks posed by pesticides at local level. Climatic and other factors Luisa Eugenia Castillo, lcastill@una.ac.cr Universidad Nacional, Costa Rica Special considerations in tropical areas: Special considerations in tropical areas: Special considerations in tropical areas: Special considerations in tropical areas: Special considerations in tropical areas: Exposed soil previous to planting pineapples Extensive use of drainage canals with no protection of borders Lack of protection protection of the borders of creeks and rivers Risk factor: Distance of cultivated area from water courses Pesticide use in Central American countries is among the highest in the world: País Año Uso de plaguicidas Kg i.a./ha Costa Rica 2000 18,6 2 El Salvador 2000 6,8 1 Guatemala 2000 7,1 1 Honduras 2000 7,2 1 Nicaragua 2000 7,6 1 Panamá 2000 21,1 1 Region 2000 8,9 1 Dinamarca 1999 1,2 3 Francia 1999 6,0 3 Holanda 1999 5,0 3 Reference Portugal 1999 8,1 3 Unión Europea (15c 1999 4,5 3 • Source: 1- Arbeláes y Henao, 2002; 2-IRET-UNA, 2003; 3- Heidorn, 2002. Risk factors: Active ingredient % Costa Rica: toxicity of imported pesticide, 2000-2004 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% No data Low Moderated High Extreme fish daphnia Type of organism • Base de datos, IRET Endosulfan • Endosulfan: increased use since 1991. • Crops: Coffee, pineapples, vegetables, fruits, rice. • Banned in Belize, Colombia and Sweden. Restricted in Argentina, Canada, Honduras, Japan, Panama, EU. - Concentrations of pesticides in soil and location of banana plantations. - The five highest soil concentrations ocurred at the five sites with elevations over 2500m. - Concentrations of endosulfan related compound in passive air samplers 2004-2005 (ng/sampler). - Maximum concentration reported in North American study: 150 ng per sampler. - Highest air levels were found in urban areas and close to agricultural areas. Backtrajectory probability map (airshed). The darker the color, the more probable that air trajectories passed through that spot. Bromacil in groundwater Pesticides 16 positive samples/115 total samples Bromacil 0.5-20 µg/L Clorotalonil 0.05-1 µg/L Nitrates 79 samples analyzed Maximum conc: 18 mg/L 49 samples >5 mg/l Fish kills: • Frequent in agricultural areas. • No data base on fish kills and other environmental accidents. Algunas familias de peces observadas en las mortandades: • • • • • • Characidae Cichlidae Mugilidae Centropomidae Paralichthyidae Guerridae Pesticides found in samples collected during fish kills (LAREP, IRET) Año Ubicació Ubicación Muestra Plaguicidas 2003 Canal Salado, Matina agua ethoprofos: 0,4 µg/L propiconazol: 0,2 µg/L difenoconazol: trazas 2003 Laguna Madre de Dios y Caño Santa Marta peces (Centropomid ae) ethoprofos: 0,1 µg/g ww terbufos: 0,2 µg/g ww* 2004 R.Aguas Zarcas, Siquirres agua ethoprofos: 0,4 µg/L 2004 R. Madre de Dios Agua peces ethoprofos: 2,9 µg/L chlorotalonil: 15 µg/L difenoconazol: 0,1µg/L ethoprofos: 0,07 µg/g ww stomach content 2004 Canal de Batán peces(tilapia) terbufos: 0,2 µg/g ww 2005 Laguna Madre de Dios agua(3 muestras) bromacil: 0,7 µg/L chlorotalonil: 0,4 µg/L fenamifos : 1 µg/L Risk factors: • Quantities and toxicity of pesticides applied (ai/ha) ¾ Pesticide use in banana plantations in the 1990´s: aprox 35-40 kg ai/ha ¾ Recent estimates are close to 60 kg ai/ha, with more fungicides and nematicide use. • Type of applications: aerial, granulated compounds not incorporated to the soil. • Extensive systems of drainage canals Summary of findings Studies indicate widespread pollution including aquatic ecosystems, coastal areas, montane forest, and groundwaters. Some studies report toxic effects to organisms and significant changes in community composition after pesticide applications Data gaps in the Region are considerable and need reliable inventories of sources, monitoring of emissions and surveillance of environmental and health exposure and effects. Challenges ¾ Increased efforts to link residues and effects. ¾ Improvement of toxicity testing with native sensitive organisms. ¾ Improvement of rapid and reliable identification of damages and causes (fish dieoffs). ¾ Need to evaluate the risk that agricultural practices place on the region´s ecological reserves and biodiversity. ¾ Studies must include vulnerable tropical ecosystems (mangroves, coral reefs, cloud and rainforest) Pesticides and possible link to amphibian declines? • Neotropical amphibian populations and in particular, those inhabiting montane areas are declining. • Pathogens in combination with global warming have recently been implicated in the decline of amphibian populations in the neotropics. • However there could be a potential role of contaminants. • Declines in amphibian populations in California have been linked to pesticide deposition. ¾Studies related to climate change: ¾High temperatures might have an influence on toxicity. ¾Interaction with factors such as UV and oxygen depletion. ¾Higher concentration of pesticides in water might ocurr by water evaporation. Final comments ¾ Enhancemant of clean technologies in agriculture is a key issue in the reduction of pesticide loads in the Region. ¾ Ecotoxicological studies can play a key role providing relevant data on environmental exposure and effects, as well as tools for control of pesticide use and for measuring health of ecosystems. ¾ Consumers in developed countries appear as key partners! Muchas gracias! Thank you!