Publisher : Bulletin of Marine Science
Place of publication :
Publication year : 2003
Thematic : Coral Reef
Language : English
Note
Free-living marine nematode assemblages were studied at four sites in Banco
Chinchorro, Caribbean Sea, Mexico: Cayo Norte, Cayo Lobos, Isla Che, and Cayo Centro.
Three orders, 21 families, 65 genera, and 98 species represented the nematode fauna. The
order Chromadorida was the best represented with nine families, and 56 species, followed
by Enoplida (nine families, 22 species), and Monhysterida (three families, 16 species).
Desmodoridae had the highest number of species (31). The highest nematode density
(1.83 ¥ 105 nematodes m-3) was found at Cayo Centro, followed by Cayo Norte (1.77
¥ 105 nematodes m-3). Lowest nematode density was found at Isla Che (3.18 ¥ 104 nematodes
m-3). Cayo Norte had also the highest number of species (47), with a diversity of
H´= 5.03 bits ind-1 and an evenness value of 0.91; Cayo Lobos and Cayo Centro had a
similar number of species (41 and 40, respectively) and a similar diversity (H´= 4.76 bits
ind-1 and H´= 4.67 bits ind-1). Isla Che presented the lowest number of species (14) and
diversity (H´= 3.55 bits ind-1). At Cayo Lobos, an inner station, nematodes had small and
annulated bodies with many somatic setae, typical of sandy environments with high energy.
At the family level, the nematode fauna at Banco Chinchorro is similar to other
assemblages found in the Caribbean. All species registered in this study add new evidence
of their geographic range in the western Caribbean. The nematode fauna surveyed
represent possibly up to 69% of new species. Nematoda diversity values found at Banco
Chinchorro were higher than those known in similar environments.
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Keywords : Thermoregulation
Encoded by : Pauline Carmel Joy Eje
