Assessment of turtle grass (Thalassia testudinum ex Banks Konig) community structure in a UNESCO Biosphere Reserve

Paul Bologna, Rita Papagian, Suzann Regetz, Cathleen Dale

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

Tropical turtle grass beds (Thalassia testudinum) were investigated in an UNESCO Biosphere Reserve in St. Johns Island, United States Virgin Islands. Four coastal bays were studied to assess floral characteristics, benthic invertebrate density and secondary production. These bays varied with respect to oceanic exposure and anthropogenic stresses. Results indicate that Coral Bay Harbor, the most anthropogenetically impacted site, had the highest T. testudinum biomass, but the lowest floral diversity. Its faunal community was dominated by small polychaetes with significantly lower secondary production. The most protected site (Hurricane Hole) maintained the highest floral and faunal species richness, faunal density, faunal diversity, and secondary production. The other two bays, Great Lameshur and Little Lameshur, demonstrated intermediate plant biomass and species richness, faunal density and secondary production. Each of these bays, however, had high oceanic exposure due to their orientation which also demonstrated a sediment size shift to larger particles compared to the other sites. One unique finding was a significant increase in the shoot:root ratio in Little Lameshur where green turtle (Chelonia mydas) grazing was frequently observed, suggesting a potential top-down structuring force in this bay.

Original languageEnglish
Pages (from-to)148-155
Number of pages8
JournalJournal of Experimental Marine Biology and Ecology
Volume365
Issue number2
DOIs
StatePublished - 31 Oct 2008

Fingerprint

secondary productivity
UNESCO
turtle
community structure
secondary production
grass
Chelonia mydas
Virgin Islands
species diversity
hurricanes
root shoot ratio
species richness
Polychaeta
island state
corals
root-shoot ratio
invertebrates
biomass
grazing
sediments

Keywords

  • Community structure
  • Diversity
  • Secondary production
  • Thalassia testudinum
  • Turtle grass

Cite this

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title = "Assessment of turtle grass (Thalassia testudinum ex Banks Konig) community structure in a UNESCO Biosphere Reserve",
abstract = "Tropical turtle grass beds (Thalassia testudinum) were investigated in an UNESCO Biosphere Reserve in St. Johns Island, United States Virgin Islands. Four coastal bays were studied to assess floral characteristics, benthic invertebrate density and secondary production. These bays varied with respect to oceanic exposure and anthropogenic stresses. Results indicate that Coral Bay Harbor, the most anthropogenetically impacted site, had the highest T. testudinum biomass, but the lowest floral diversity. Its faunal community was dominated by small polychaetes with significantly lower secondary production. The most protected site (Hurricane Hole) maintained the highest floral and faunal species richness, faunal density, faunal diversity, and secondary production. The other two bays, Great Lameshur and Little Lameshur, demonstrated intermediate plant biomass and species richness, faunal density and secondary production. Each of these bays, however, had high oceanic exposure due to their orientation which also demonstrated a sediment size shift to larger particles compared to the other sites. One unique finding was a significant increase in the shoot:root ratio in Little Lameshur where green turtle (Chelonia mydas) grazing was frequently observed, suggesting a potential top-down structuring force in this bay.",
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Assessment of turtle grass (Thalassia testudinum ex Banks Konig) community structure in a UNESCO Biosphere Reserve. / Bologna, Paul; Papagian, Rita; Regetz, Suzann; Dale, Cathleen.

In: Journal of Experimental Marine Biology and Ecology, Vol. 365, No. 2, 31.10.2008, p. 148-155.

Research output: Contribution to journalArticleResearchpeer-review

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