Status of Mangrove Forests in Trinidad and Tobago, West Indies

Juman, Rahanna A.; Ramsewak, Deanesh

doi:10.18475/cjos.v47i3.a18

Cited by 9 publications

(11 citation statements)

References 3 publications

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“…The Caroni Swamp covers 52.63 km 2 on the Gulf of Paria coast of Trinidad and Tobago in the Orinoco River estuary (Juman & Ramsewak 2013). It is characterised by an estuarine mangrove forest dominated by Rhizophora mangle.…”

Section: Study Areamentioning

confidence: 99%

Mangrove and mudflat food webs are segregated across four trophic levels, yet connected by highly mobile top predators

Marley¹,

Lawrence²,

Phillip³

et al. 2019

Mar. Ecol. Prog. Ser.

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Seascape connectivity is crucial for healthy, resilient ecosystems and fisheries. Yet, our understanding of connectivity in turbid mangrove-lined estuaries -some of the world's most productive ecosystems -is limited to macrotidal systems, and rarely incorporates highly mobile top predators. We analysed d 13 C and d 15 N isotope values of seven primary producers, 24 invertebrate taxa, 13 fishes, four birds and one reptile to reveal trophic interactions within and between a mangrove and adjacent mudflat in a microtidal system of the Gulf of Paria, Orinoco River estuary. Primary producers, invertebrates and fishes collected within the mangrove were significantly depleted in 13 C and 15 N compared to those collected on the mudflat. Stable isotope mixing models showed that mangrove-derived carbon was predominantly assimilated by invertebrates (78±5%) and fishes (88±11%) sampled in the mangrove. In contrast, invertebrates and fishes sampled in the mudflat derived less than 21% of their carbon from mangrove sources.Instead, microphytobenthos and phytoplankton underpinned the mudflat food web. Scarlet ibis (Eudocimus ruber) and night heron (Nyctanassa violacea) were also highly associated with mangrove carbon sources. However, osprey (Pandion haliaetus), snowy egret (Egretta thula), and caiman (Caiman crocodilus) obtained carbon from both mangrove and mudflat sources, effectively integrating the food webs. The present study demonstrates simultaneous aspects of food web segregation and connectivity, as well as the importance of surveying the entire food web across a range of tidal systems when investigating seascape connectivity.

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Section: Study Areamentioning

confidence: 99%

Mangrove and mudflat food webs are segregated across four trophic levels, yet connected by highly mobile top predators

Marley¹,

Lawrence²,

Phillip³

et al. 2019

Mar. Ecol. Prog. Ser.

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“…1). The mangrove is comprised predominantly of the species Rhizophora mangle, Avicennia germinans and Laguncularia racemose (Juman & Ramsewak 2013). A tidal range of approximately 1 m on spring tides is sufficient for mangrove creeks to remain flooded at low tide.…”

Section: Study Areamentioning

confidence: 99%

Mangrove or mudflat: Prioritising fish habitat for conservation in a turbid tropical estuary

Marley

Deacon

Phillip

et al. 2020

Estuarine, Coastal and Shelf Science

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“…Presently, there is no more rice cultivation due to the intrusion of saltwater and changes in government policies (Juman & Ransewak, 2013). Some abandoned fields are used for grazing of cattle, goats and sheep, and are referred to as wet pastures.…”

Section: Regional Settingmentioning

confidence: 99%

“…Some abandoned fields are used for grazing of cattle, goats and sheep, and are referred to as wet pastures. There are, however, small areas of vegetable farming, mainly for the production of the short-term traditional crops (Juman & Ransewak, 2013).…”

Section: Regional Settingmentioning

confidence: 99%

Benthic Foraminifera and Thecamoebians of Godineau River Estuary, Gulf of Paria, Trinidad Island

et al. 2017

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In the Godineau River Estuary, located in Trinidad Island (off the northeast coast of Venezuela), were found 114 taxa of foraminifera and 17 of thecamoebians in the dead fauna. Most of the identified foraminiferal species were rare because they were transported from the Gulf of Paria to this estuary. The autochthonous foraminiferal assemblage was represented by several tropical estuarine species such as Ammonia tepida, Ammotium salsum, Arenoparrella mexicana, Cribroelphidium excavatum, Ammonia parkinsoniana, Haplophragmoides wilberti, Miliammina fusca and Ammotium cassis. The thecamoebians assemblages, found in the inner part of this estuary, were dominated by Cyclopyxis spp., Centropyxis spp., Difflugia corona and Difflugia urceolata. The relative abundance of the main species of foraminifera and thecamoebians were analyzed through Q-mode and R-mode cluster analyses. Statistical results revealed the presence of three different environments in the Godineau River Estuary related to different hydrodynamic conditions and more or less oceanic or fluvial influence. The first sector represents the most confined region of the estuary and was mainly composed by agglutinated foraminifera together with thecamoebians. The second sector was located in the middle part of the estuary and was associated with the presence of brackish waters. The third sector denotes the outermost part of the estuary characterized by the greatest hydrodynamic activity and highest oceanic influence within the estuary. This sector was marked by the occurrence of a large number typical-marine foraminifera species. Keywords: Estuarine compartments; Foraminifera; thecamoebians; microtidal estuary; tropical coastal environment ResumoNo estuário do Godineau localizado na ilha de Trinidad (ao noroeste da costa de Venezuela) foram identificados 114 táxons de foraminíferos e 17 de tecamebas da fauna morta. Muitas das espécies de foraminíferos identificadas são raras e pequenas indicando transporte do Golfo de Paria para dentro do estuário. Os foraminíferos autóctones foram representados por espécies típicas de estuários tropicais como Ammonia tepida, Ammotium salsum, Arenoparrella mexicana, Cribroelphidium excavatum, Ammonia parkinsoniana, Haplophragmoides wilberti, Miliammina fusca e Ammotium cassis. As tecamebas eram abundantes na região mais interna do estuário. As espécies dominantes foram Cyclopyxis spp., Centropyxis spp., Difflugia corona e Difflugia urceolata. A abundância relativa das principais espécies foi analisada através da análise de agrupamento em modo Q e R. As análises estatísticas revelaram a existência de três ambientes distintos no estuário que são relacionados a diferentes condições hidrodinâmicas de maior ou menor influência marinha ou fluvial. O primeiro setor representou a região mais confinada do estuário composta por foraminíferos aglutinantes junto com tecamebas O segundo setor foi localizado na região intermediária do estuário e era tipicamente um ambiente salobro (mixohalino). O terceiro sector, situado na parte mais e...

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Status of Mangrove Forests in Trinidad and Tobago, West Indies

Cited by 9 publications

References 3 publications

Mangrove and mudflat food webs are segregated across four trophic levels, yet connected by highly mobile top predators

Mangrove and mudflat food webs are segregated across four trophic levels, yet connected by highly mobile top predators

Mangrove or mudflat: Prioritising fish habitat for conservation in a turbid tropical estuary

Benthic Foraminifera and Thecamoebians of Godineau River Estuary, Gulf of Paria, Trinidad Island

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