Scott Smith, Michele Thieme, Jennifer Hales
Major Habitat Type
Tropical and subtropical coastal rivers
Drainages flowing into
Golfo de Panamá and Pacific Ocean
Main rivers to other water bodies
This ecoregion is home to some of the largest rivers of the Pacific slope, including Bayano, Tuira, Balsas, and Chucunaque. Río Tuira, one of the longest rivers, runs from its headwaters in the Sierranía del Darién to the Golfo de San Miguel. Other rivers that flow into the Golfo de San Miguel are the Sambú and Taimati. The ecoregion is also home to the artificial Lake Bayano, as well as two of the three major hydrographic watersheds of the country: Bayano-Chepo and Tuira-Chucunaque (MINSA 2007).
This ecoregion extends from Punta Chame in Panama (western boundary of the Río Capira) to the Río Tuira drainage in the northeast. The ecoregion also includes the Archipiélago de la Perlas in the Golfo de Panamá.
Hills less than 600 m cover much of the western portion of the ecoregion, whereas mountains of the Sierranía del Darién border the northeastern edge. The Bayano and Chucunaque rivers drain in depression terrains (MINSA 2007).
The freshwater habitats of this ecoregion include brackish to freshwater marshes and swamps, mangroves, rivers, and streams. Some of the larger areas of coastal mangroves and mudflats include Chame Bay, the mouths of the ríos Tapia and Pacora, the lower Río Bayano, the mouths of the ríos Juan Díaz and Tocumen, and along the coast toward Río La Maestra. Freshwater wetlands occur at Tocumen marsh, La Jagua, and the Chimán wetlands, which also includes extensive mudflats and coastal mangroves. The estuaries on the north and eastern side of the Golfo de San Miguel also contain extensive tidal mudflats and mangroves, including those around the Congo and Cucunatí, the mouth of the Río Sambú, and in the Punta Patiño Reserve (Angehr 2005).
Lake Bayano is a reservoir formed by the damming of the Río Bayano (Chepo). The lake has since become one of the most important freshwater habitats in eastern Panama.
Wet and humid lowland forest is the dominant vegetation type throughout much of the ecoregion (Stattersfield et al. 1998). The terrestrial ecoregions that comprise these moist forests include the Isthmian-Atlantic moist forests and South American Pacific mangroves that flank the Bahía de Panamá and Golfo de San Miguel, and the Chocó-Darién moist forests that border the northern and eastern side of the ecoregion. Eastern Panamanian montane forests occupy higher elevations (World Wildlife Fund 2001).
Description of endemic fishes
The Tuira ecoregion contains fourteen endemic species, including Dasyloricaria capetensis, Dasyloricaria tuyrensis, Rineloricaria altipinnis, and Sturisomatichthys citurensis (Loricariidae); Amphilophus calobrensis and Vieja tuyrensis (Cichlidae); Brycon striatulus and Bryconamericus bayano (Characidae); Apteronotus rostratus (Apteronotidae); Characidium marshi (Crenuchidae); Neoheterandria cana (Poeciliidae); Piabucina festae (Lebiasinidae); and Pimelodus punctatus (Pimelodidae).
Justification for delineation
Fish provinces from Bussing (1976) were revised and subdivided based on application of a similarity index to sub-basin fish presence/absence data.
Level of taxonomic exploration
The level of taxonomic exploration is fair. More ichthyological work is required in the Tuira drainage basin as well as some of the southeastern drainages in Panama to fully characterize the fauna.
- Bussing, W. A. (1976). "Geographic distribution of the San Juan ichthyofauna of Central America with remarks on its origin and ecology" T. B. Thorson (Ed.) Investigations of Nicaraguan lakes ( pp. 157-175 ) Lincoln, Nebraska: University of Nebraska.
- Smith, S. A. and Bermingham, E. (2005). "The biogeography of lower Mesoamerican freshwater fishes" Journal of Biogeography 32 (10) pp. 1835-1854.
- Bermingham, E. and Martin, A. P. (1998). "Comparative mtDNA phylogeography of neotropical freshwater fishes: testing shared history to infer the evolutionary landscape of lower Central America" Molecular Ecology 7 (4) pp. 499-517.
- Stattersfield, A. J.,Crosby, M. J.,Long, A. J.;Wege, D. C. (1998). "Endemic bird areas of the world: Priorities for biodiversity conservation" Cambridge, UK: BirdLife International.
- World Wildlife, F. (2001). "Terrestrial Ecoregions of the World" 2005 (2005; www.worldwildlife.org/science/ecoregions/biomes.cfm).
- Angehr, G. R. (2005) \Final Report Waterbirds in Panama\ (Balboa, Panama)
- Araúz, J.;Gorrichátegui, K. (2000). "Una colonia de anidación de Garza Cocoi (Ardea cocoi) en Panama" El Tucán