Twenty years of lichen cover change in a tropical habitat (Costa Rica) and its relation with air pollution

Twenty years of lichen cover change in a tropical habitat (Costa Rica) and its relation with air pollution

dc.creatorMonge-Nájera, Julián
dc.creatorGonzález, María I
dc.creatorRivas Rossi, Marta
dc.creatorMéndez-Estrada, Víctor Hugo
dc.date2002-03-01
dc.date.accessioned2023-08-03T17:53:44Z
dc.date.available2023-08-03T17:53:44Z
dc.identifierhttps://revistas.ucr.ac.cr/index.php/rbt/article/view/16288
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7897520
dc.descriptionWe report lichen cover change over a 20 years period for the Costa Rican capitol city. Foliaceous lichen cover was measured with a 10 X 10 cm template positioned 1.5 m above ground on the south, east, north and west sides of ten phorophytic trees per station (11 stations) from 1976 through 1997. Results were compared with previous measurements along an urban transect (at three heights above ground) and in a rural station. Lichen cover was correlated with traffic density and varied between stations and years. Mean lichen cover was 23% in 1976, 12% in 1986, 9% in 1990 and 22% in 1997. Most stations suffered a large cover reduction after 1976 but improved after 1990, possibly reflecting improved traffic regulations and elimination of lead (Pb) from gasoline. Cover values by cardinal orientation were: west 17%, east 14%, north 13% and south 12%. Sidewalks of streets with more traffic had lower cover values. In the rural station, cover was lower than expected (possibly because of climate), and was not correlated with height above ground or cardinal orientation, in contrast with temperate regions. In polluted cities human activity should concentrate above the first floor of buildings (particularly in hospitals or schools) because pollution was found to concentrate in the first 2 m above ground.en-US
dc.descriptionSe analizaron los cambios en la cobertura de líquenes foliosos de troncos en la ciudad de San José, Costa Rica, de 1976 a 1997, con base en conteos de cobertura que usaron cuadrículas de 10 X 10 cm en 11 estaciones. Las coberturas medias totales fueron 23% en 1976, 12% en 1986, 9% en 1990 y 22% in 1997. Hubo un deterioro después de 1976 y una mejora a partir de 1986, al disminuir la cantidad de plomo en la gasolina y mejorarse los patrones de tránsito. La mayor cobertura se da en el lado oeste de los troncos y en las aceras de calles más transitadas. En una localidad rural estacional (Turrúcares de Alajuela) no hubo relación entre cobertura de líquenes y lado, altura sobre el suelo, y diámetro, color y textura del tronco.es-ES
dc.formatapplication/pdf
dc.languageeng
dc.publisherUniversidad de Costa Ricaen-US
dc.relationhttps://revistas.ucr.ac.cr/index.php/rbt/article/view/16288/15768
dc.rightsDerechos de autor 2002 Revista de Biología Tropicales-ES
dc.rightshttp://creativecommons.org/licenses/by/4.0es-ES
dc.sourceRevista de Biología Tropical; Vol. 50 No. 1 (2002): Volume 50 - Regular number 1 - March 2002; 309–319en-US
dc.sourceRevista de Biología Tropical; Vol. 50 Núm. 1 (2002): Volumen 50 - Número regular 1 - Marzo 2002; 309–319es-ES
dc.sourceRevista Biología Tropical; Vol. 50 N.º 1 (2002): Volumen 50 - Número regular 1 - Marzo 2002; 309–319pt-PT
dc.source2215-2075
dc.source0034-7744
dc.subjectlong term changeen-US
dc.subjectbioindicationen-US
dc.subjectlichensen-US
dc.subjecturban air pollutionen-US
dc.subjectcitiesen-US
dc.subjecttropical climateen-US
dc.titleTwenty years of lichen cover change in a tropical habitat (Costa Rica) and its relation with air pollutionen-US
dc.titleTwenty years of lichen cover change in a tropical habitat (Costa Rica) and its relation with air pollutiones-ES
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeArticleen-US


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