The Pará mangroves is an ecoregion along the Atlantic coast of the state of Pará in Brazil. They constitute the western extension of the Maranhão mangroves ecoregion. The mangroves are relatively intact, although they are under some pressure from agriculture and logging.
The terrain consists of islands and mudflats created from fine-grained sediments and clay deposited by the Amazon, which are colonized as they form and stabilized by the salt-tolerant mangroves. The tides range from. Since the land is flat, saline water and mangroves are found as much as from the coast. The climate is tropical, warm and humid. Temperatures range from. Mean air temperature is about. Mean annual rainfall is about, with a well-defined dry season from July to December when monthly rainfall is under. Annual rainfall may be as high as.
Ecology
The ecoregion is in the Neotropical realm and the mangrove biome. Mangroves form a continuous belt along the Pará and Maranhão coasts, with six species of mangrove trees and several associated species. They are important as a nursery for fish and in protecting the coast, and provide an important source of food and other resources to the local human population. The mangroves of Pará and Maranhão extend along of coast and cover about or about 85% of mangroves in Brazil. The mangroves benefit from the constant influx of fresh water from rainfall and from the Amazon River. However, they must compete with freshwater hardwood species typical of the Amazon rainforest.
Flora
The most common mangrove tree species in Rhizophora mangle, which dominates estuaries that are most exposed to the ocean. Rhizophora mangle reaches in height. Rhizophora racemosa is less common, found only in Pará only in Marajó Bay, as is Rhizophora harrisonii, intermediate in salt tolerance between these two. Avicennia germinans is common on higher areas with less flooding, and under more saline conditions. Avicennia schaueriana is less common, mainly found near sandy beaches. Avicennia schaueriana may reach in height. Laguncularia racemosa is found along the coast in saline and brackish environments, mostly along forest edges and other open spaces. The transition zone between the coastal mangroves and inland dry forest holds Rhizophora racemosa, Rhizophora harrisonii, Laguncularia racemosa and Conocarpus erectus mangroves, as well as Spartina alterniflora on the seaward margin and Hibiscus tiliaceus and Acrostichum aureum on the landward margins. Tropical forest and palm species that grow with the mangroves include Dalbergia brownei, Rhabdadenia biflora, Montrichardia arborescens, Mora oleifera, açaí palm and Orbygnia martiana.
The World Wildlife Fund gives the ecoregion the status of "Relatively Stable/Intact". The mangroves are inaccessible, and population density is low, so much of the habitat is intact other than the city of Belém and its surroundings. The mangroves are used by artisanal fishermen as a source of crabs and wood. Threats include subsistence agriculture and livestock raising, tourism, logging, mining and urban development.
