Location and General Description
This small mangrove ecoregion is located at where the Piura River enters the Pacific Ocean and creates a small estuary, along the coast of Peru. The climate is described as semi-arid and tropical dry but highly variable from one year to the next (Spalding 1997). Average annual temperature is about 24 C, with a minimum of 18 C and a maximum of 31 C (Davis et al. 1997). The annual rainfall is low averaging about 100 mm or less but in El Nino years it can be 60 times as high (Spalding 1997, Echevarria & Sarabis 1993).
Avicennia germinans is the dominant mangrove vegetation that grows in this ecoregion. Stands of Avicennia sp. form narrow fringes along the river and marshes in this ecoregion. This mangrove vegetation is short and may reach 20 cm in diameter. According Cintron and Schaeffer-Novelli (1985) cited in Echevarria & Sarabis (1993) Laguncuria racemosa is also found in this ecoregion. The surrounding habitats do not follow strict bounds as border mixing allows common Sechura Desert species to mix including Parkinsonia aculeata and Alternanthera peruviana while coastal dunes maybe stabalized by Distichlis spicata and Cryptocarpus pyriformis (Davis et al. 1997).
This ecoregion is a small part of many larger important areas. For example, it is within the Lomas Formations site a named centre of plant diversity designated by The World Wildlife Fund and The World Conservation Union (Davie et al 1997). It is also within the Tumbesian Region an Endemic Bird Area designated by BirdLife International (Stattersfield et al 1998). Two species from this EBA reside in the littoral zone and most likely utilize these mangroves the Cinclodes taczanowskii and Geositta peruviana (Stattersfield et al. 1998).
This ecoregion's current state is not well known, although it does fall within a highly used tourist area. The city of Piura is not far from the coast and these mangroves, which is also applying pressures to the ecosystem through water diversion and pollution as well as development and other activities.
Types and Severity of Threats
The diversion of water from the Piura River, for human uses such as irrigation, is a major threat to the mangrove vegetation. As less water makes it to the end of the river where the mangroves await is arrival the consequently higher the salinity will remain; eventually making mangrove growth impossible and die off will occur. A delicate balance of saline and freshwater must be up held by the inflow of the Piura River to this estuary; with low rainfall it is the main source. Cutting of mangrove trees and over use of the area is also a threat.
Justification of Ecoregion Delineation
Classification and linework for all mangrove ecoregions in Latin America and the Caribbean follow the results of a mangrove ecoregion workshop (1994) and subsequent report (Olson et al. 1996).
Davis, A.D., V.H. Heywood, O. Herrera-MacBryde, J. Villa-Lobos, and A.C. Hamilton. 1997. Centres of Plant Diversity: A guide and strategy for their conservation. Information Press, Oxford, UK.
Echevarria, J., and J. Sarabia. 1993. Mangroves of Peru. In L.D. Lacerda A Technical Report of the project: Conservation and Sustainable Utilization of Mangrove Forests in Latin America and Africa Regions. International Society for Mangrove Ecosystems, Yokohama, Japan.
Ecoregional Workshop: A Conservation Assessment of Mangrove Ecoregions of Latin America and the Caribbean. 1994. Washington D.C., World Wildlife Fund.
Olson, D.M., E. Dinerstein, G. Cintrón, and P. Iolster. 1996. A conservation assessment of mangrove ecosystems of Latin America and the Caribbean. Final report for The Ford Foundation. World Wildlife Fund, Washington, D.C.
Spalding, Mark, François Blasco and Colin Field. 1997. World Mangrove Atlas. The International Society for Mangrove Ecosystems, Okinawa, Japan.
Stattersfield, Alison J., Michael J. Crosby, Adrian J. Long and David C. Wege. 1998. Endemic Bird Areas of the World: Priorities for biodiversity conservation. BirdLife International. The Burlington Press, Cambridge, UK.
Tomlinson, P.B. 1986. The botany of mangroves. Cambridge University Press. Melbourne, Australia.
Prepared by: Christine Burdette
Reviewed by: In process