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Dry thicket vegetation on Little Cayman with the endemic palm, Coccothrinax proctorii

The Cayman Islands are located in the western Caribbean and comprise the islands of Grand Cayman, Cayman Brac, and Little Cayman. They are situated 240 km south of Cuba and 268 km north west of Jamaica. The islands form emergent peaks of a partially submerged mountain range which extends from southeast Cuba across the northwest Caribbean to the Gulf of Honduras. The highest point on the Cayman Islands is The Bluff, a limestone outcrop rising to 43 m on the eastern end of Cayman Brac. The Caymans' landscape is composed mostly of low-lying limestone and dolostone rocks, derived from ancient seabed sediments. The Cayman Islands have a tropical climate, with a wet season of warm, rainy summers (May to October) and a dry season of relatively cool winters (November to April). Annual rainfall averages between 1049 mm and 1595 mm.

The Bluff, Cayman Brac

Historically, the vegetation of the Cayman Islands were covered in a mosaic of dry forest, dry scrublands, seasonally flooded wetlands and extensive mangroves. This vegetation still exists today but is fragmented, modified and frequently degraded. Dry forest ranges in height from 4.5 to 16 m depending on species composition and water availability. Dry scrubland with a maximum canopy of 4 m occupies the eastern side of all three islands where there is little rainfall. Growing along the 'ironshore' coastal areas, the scrub becomes dwarfed and lower in diversity. However, this differs from the specialised coastal scrub that exists on seaward areas. Wetlands dominated by Black, White, and Red Mangrove occur around sheltered coastal areas with Buttonwood growing in less saline conditions inland.

There are 415 species and varieties native to the Cayman Islands. Of these, 21 species of higher plants are known to be endemic with a further eight species representing endemic Caymanian varieties. Loss of dry forest habitat, Cayman Brac Perhaps, the most important species are those that are endemic to a single island. Grand Cayman lays claim to the greatest number of endemic species: Hohenbergia caymanensis, Salvia caymanensis, Pisonia margaretae, Dendrophylax fawcettii, Scolosanthus roulstonii, Casearia staffordiae, Agalinus kingsii and Aegiphyla caymanensis. Grand Cayman also has three endemic varieties: Pectis caymanensis var. robusta, Terminalia eriostachya var. margaretiae, and Myrmecophila thompsoniana var. thompsoniana. Cayman Brac has one endemic species, Verbesina caymanensis and two endemic varieties: Consolea millspaughii var. caymanensis and Epiphyllum phyllanthus var. plattsii. One endemic species is restricted to Little Cayman, Chamaesyce caymanensis. There are also three sister island endemic species (i.e. restricted to two of the Cayman Islands) and one endemic variety. In addition, twenty four species are considered near-endemic (i.e. native to the Caymans and one other island) and forty four are local regional (i.e. native the NW Caribbean region). The Cayman Islands are also home to ten Caribbean endemic genera; Leptocereus (1 sp.), Chascotheca (1 sp.), Picrodendron (1 sp.), Petitia (1 sp.), Dendropemon (2 spp.), Neoregnellia (1sp), Tolumnia (2 sp.), Margaritopsis (1 sp.), Scolosanthus (1 sp.) and Hypelate (1 sp.).

The alien tree Casuarina equisetifolia invading Cayman's coast

The most serious threat to Caymanian plant-diversity is the destruction of habitat on which species and their habitats ultimately depend. Large scale deforestation appears to be accelerating and other unsustainable forms of human activity and land uses, such as housing, roads and golf courses, continue to displace native biodiversity. As a result, 46% of Cayman Islands' native plants are now threatened with extinction. If measures are not taken, recent estimates indicate that complete deforestation will have occurred in all three islands by the end of the century.

Invasive species are also a major problem. Logwood Tree (Haematoxylum campechianum) forms almost entire monocultures over extensive areas of land. Kew staff examining a flowering specimen of Agave caymanensis Australian Pine (Casuarina equisetifolia) aggressively spreads in sandy coastal areas in place of native coastal vegetation and the needle-like leaves suppress germination of other plants. Beach Naupaka (Scaevola taccada) is replacing extensive areas of native coastal vegetation and has reduced the indigenous Bay Balsam (Scaevola plumieri) to one remaining population on Grand Cayman.

Combined with loss of habitat and invasion by non-native species, global climate change is increasingly becoming a real threat. Modifications to temperature and rainfall, sea level rise and an increase in severe whether events, such as hurricanes, could lead to more species being listed as critically endangered or even extinct.

Red-Listing

A full plant species red list assessment has been completed for all of the Cayman Islands. Of the 415 taxa assessed using 2001 IUCN Red Listing criteria, a total of 46% are endangered, this includes 20% as Critically Endangered, 15% Endangered and 11% Vulnerable. The Red List was funded through a grant from the the British Governments Overseas Territories Environment Programme (OTEP) to the Cayman Islands Department of Environment (OTEP: CAY-001, Red-List Assessment of Cayman Islands' native flora for legislation and conservation planning) and published by RBG, Kew.

© Copyright Board of Trustees of the Royal Botanic Gardens, Kew
Department of Environnment

Kew's UK Overseas Territories team collaborates with the Cayman Islands Government, Department of Environment on plant conservation activities.



Progress in implementing the Global Strategy for Plant Conservation Targets

  • Target 1
  • Species checklist complete and Flora published (2nd edition due 2009); virtual herbarium online
  • Target 2
  • Redlist complete and published (2008)
  • Target 3
  • Darwin Initiative funded project has produced a Biodiversity Action Plan for the Cayman Islands which includes Species Action Plans for the threatened plants
  • Target 4
  • Co-ordinated internationally
  • Target 5
  • The most important communities of threatened plants have been mapped on all three Cayman islands as part of the red listing process
  • Target 6
  • Production land well defined
  • Target 7
  • Some populations of threatened species protected in the Mastic Reserve, Salina Reserve and Central Mangrove Wetland on Grand Cayman, the Brac Parrot Reserve on Cayman Brac, and the Booby Pond Nature Reserve on Little Cayman
  • Target 8
  • Salvia caymanensis in long-term storage in RBG Kew's Millennium Seed Bank and in cultivation in the Queen Elizabeth II Botanic Park (QEIIBP) and RBG Kew; native species nursery established at QEIIBP where 30 indigenous species (the 'Cayman Collection') are grown to provide local plants for private and commercial landscaping
  • Target 9
  • No current activity
  • Target 10
  • Checklist of non-native plant species complete; highly invasive species identified and distributions mapped including Haematoxylum campechianum (Logwood), Casuarina equisetifolia (Australian Pine) and Scaevola taccada (Beach Naupaka)
  • Target 11
  • No plant species in international trade
  • Target 12
  • No plant-based products produced
  • Target 13
  • No current indigenous use of plants
  • Target 14
  • Several on-going awareness raising programmes such as the National Trust for the Cayman Islands 'Know Your Islands' programme; regular educational visits to QEIIBP by school groups; Darwin Project newsletters published and circulated; regular press releases by DoE; Cayman Biodiversity website successfully launched
  • Target 15
  • Two QEIIBP staff completed the Botanic Garden Management course at RBG Kew; Department of Environment (DoE) staff attended the Defra sponsored Caribbean Regional GSPC Workshop; Darwin Initiative project workshops included seed collecting, invasive species monitoring and GIS mapping
  • Target 16
  • QEIIBP is an active member of Botanic Gardens Conservation International (BGCI) and the Caribbean Botanic Gardens for Conservation Network; Strong international partnerships with RBG Kew, RSPB, and The Marine Turtle Research Group


    Please use the links below to see further details on conservation activities in the UK Overseas Territories

    Anguilla

    Ascension Island

    Bermuda

    British Antarctic Territory

    British Indian Ocean Territory

    British Virgin Islands

    Falkland Islands

    Gibraltar

    Montserrat

    Pitcairn Islands

    South Georgia and the South Sandwich Islands

    Sovereign Base Areas on Cyprus

    St. Helena

    Tristan da Cunha

    Turks and Caicos Islands


    Homepage of the UKOTs Online Herbarium



    Site published by
    UK Overseas Territories Science Team, Royal Botanic Gardens Kew
    Please cite as
    UKOTs Online Herbarium (2011). Published on the internet at http://herbaria.plants.ox.ac.uk/bol/UKOT (date accessed).
    For further information
    Please contact Kew UKOTs Team


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