Fauna bentónica asociada a una pradera de Thalassia testudinum (Hydrocharitaceae) en el Parque Nacional Morrocoy, Venezuela / Benthic fauna associated to a Thalassia testudinum (Hydrocharitaceae) bed in the Parque Nacional Morrocoy, Venezuela
Rev. biol. trop
;
48(Supl.1): 243-249, dic. 2000.
Article
in Spanish
| LILACS
| ID: lil-503256
ABSTRACT
The benthic fauna and diel variation in a shallow seagrass bed (Thalassia testudinum) were studied in Playa Mero, Venezuela. Samples of organisms and sediments were taken using PVC cylinders, 5cm in diameter, along a transect perpendicular to the coast. Seagrass cover, shoot density and biomass were estimated. The seagrass cover was homogeneous along the transect. The intermediate zone had the highest number of shoots and of above-ground and rhizome biomass. Composition and abundance of benthic organisms were related with seagrass and sediment characteristics. Sediment organic matter content and organism abundance were highest near the shore Molluscs, polychaetes, oligochaetes and nematodes were the most abundant groups. Species richness was higher in daytime (40 versus 28 at night). Gastropods were the most abundant organisms both at day and night while polychaetes and crustaceans increased during the day, and holoturids were more numerous at night.
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Index:
LILACS (Americas)
Main subject:
Biomass
/
Hydrocharitaceae
/
Biodiversity
/
Invertebrates
Type of study:
Risk factors
Limits:
Animals
Country/Region as subject:
South America
/
Venezuela
Language:
Spanish
Journal:
Rev. biol. trop
Journal subject:
Biology
/
Tropical Medicine
Year:
2000
Type:
Article
Affiliation country:
Venezuela
Institution/Affiliation country:
Universidad Central de Venezuela/VE
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