Caribbean Wetland Communities

We are going to be looking at:

• Herbaceous swamp vegetation
• Swamp forest
• Mangrove

Herbaceous swamp

In areas with periodic flooding or standing water, an emergent vegetation dominated by sedges and grasses is found. In islands like Cuba and Trinidad certain palms are found in this habitat as well. More will be said of this habitat under the Aquatic habitats section of the course.

Environmental features

Fresh to brackish water, anaerobic substratum 

Animals

Various crabs, especially fiddler crabs, resident and migratory birds

Caribbean Vegetation Mapping Project EquivalentCaribbean Vegetation Mapping Project Equivalent

V.B.1.N.e. Tidally flooded tropical or subtropical perennial forb vegetation
Acrostichum aureum – Acrostichum danaeifolium Herbaceous Alliance
V.A.1.N.g. Seasonally flooded tropical or subtropical grassland
Eleocharis interstincta – Sagittaria lancifolia Herbaceous Alliance

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Swamp Forest

This is an essentially freshwater, riparian (river bank) swamp forest found from St Lucia to Guadeloupe (but not Barbados and virtually absent in Martinique). It is dominated by the 20 m tall  leguminous tree Pterocarpus officinalis. This tree has sinous roots the top edges of which project above water level and allow gas exchange. The high humidity allows the growth of epiphytes.

Enviornmental conditions

Periodic flooding leading to waterlogged, anaerobic substratum. 

Animals

Various crabs, especially fiddler crabs, resident and migratory birds, boa constrictors

Caribbean Vegetation Mapping Project Equivalent

I.A.1.N.f. Tropical or subtropical seasonally flooded rain forest
Pterocarpus officinalis Forest Alliance

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Mangrove

(Also known as mangal) develops on leeward sea shores in areas of freshwater discharge.

A distinct succession  is evident as one proceeds back from the sea. Red mangrove (Rhizophora mangle) is the most salt-tolerant mangrove tree and forms a monoculture near the sea. Further back in less saline areas white mangrove (Laguncularia racemosa) and black mangrove (Avicennia spp.) [not Barbados] predominate. Few other plant species are found aside from the swamp fern (Acrostichum aureum). Further back, under less saline and drier conditions, the button mangrove (Conocarpus erectus) and coastal scrub and woodland components enter the picture.

Seaward

Landward

Front line mangrove species…

Environmental features

Salinity, anaerobic substratum, tidal variation.

Animal Life

Various crabs, especially fiddler crabs, 
resident and migratory birds. Many sponges, molluscs, fish and crustaceans in the waters beneath.

Great Blue Heron (Ardea herodias), a North American species that spends the winter months (or meets its death) in the West Indies.

Roosting brown pelicans (Pelecanus occidentalis)
 at Port Royal mangrove, Jamaica.
(Photo © Myrna Bernard)

The (flat) tree oyster, Isognomon alatus, (above) and an orange-coloured sponge, Terpios zeteki, (below) growing on red mangrove prop roots. Both species are widespread in the Caribbean.
(Photo © Myrna Bernard)

The mangrove (tree) crab, Aratus pisonii, (seen here at Port Royal, Jamaica) is a leaf-eating crab found in mangroves from Florida to Brazil.
(Photo © Myrna Bernard)

Further Information on Caribbean Wetland Plants

This guide to Wetland Plants of the Bahamas is useful even though some of the species may not be found in other parts of the Caribbean.

Caribbean Vegetation Mapping Project Equivalent

I.A.5.N.f. Tidally flooded tropical or subtropical broad-leaved evergreen sclerophyllous closed tree canopy
Avicennia germinans Forest Alliance (Black Mangrove Forest Alliance; Mangle prieto Forest Alliance)
Conocarpus erecta Forest Alliance
Laguncularia racemosa Forest Alliance (White Mangrove and Mixed Mangrove Forests)
Rhizophora mangle Forest Alliance (Red Mangrove Forests)