from Part I - Ancient invaders
Published online by Cambridge University Press: 05 February 2014
Mangroves are woody plants that occur at the land and sea interface and inhabit the upper intertidal zones of saltwater areas, primarily in tropical and subtropical regions (Tomlinson 1986; Hutchings and Saenger 1987). Since mangrove forests are an ecotone between terrestrial and marine realms, they have both vegetative strata that are similar to many inland terrestrial ecosystems as well as an intertidal benthic component that is representative of the marine environment. As such, mangroves exhibit a very steep gradient from fresh to saline water (Mitsch and Gosselink 2000). The combination of terrestrial and marine environments occurring within mangrove forests can present many difficulties, in terms of abiotic stressors, such as salt water instead of fresh water and twice daily tidal inundations, for terrestrial species attempting to colonise this habitat (Mitsch and Gosselink 2000; Luther and Greenberg 2009). Salt water could present physiological challenges for some species and high tides could present challenges for ground-nesting and terrestrial species that prefer dry land to aquatic systems. Finally, competition or predation from estuarine and marine species has the potential to inhibit the colonisation of mangrove ecosystems by some terrestrial species. The aforementioned abiotic and biotic stressors could prevent some terrestrial species from invading mangrove habitats, which makes mangroves an excellent system in which to investigate the biological invasion of species into novel habitats.
Based on floral species composition, mangroves occur in two distinct biogeographical regions, the Indo-West Pacific and the Atlantic–Caribbean–East Pacific. These regions can be further subdivided into six distinct subregions: Eastern Pacific, West Atlantic–Caribbean, West African, East African, Indo-Malaysian and Australian (Duke 1992) (see Figure 6.1). The subregions of Australia and Indio-Malaysia have more than twice as many mangrove tree species as any other subregion (Duke 1992). Mangrove forests are one of the most productive ecosystems in the world with ample food resources for both marine and terrestrial animals (Mitsch and Gosselink 2000). However, mangroves are also cited as extremely depauparate of biodiversity when compared to other habitats (Tomlinson 1986; Hutchings and Saenger 1987; Hogarth 2007).
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.