Biological traits analysis of free-living nematodes as indicators of environmental quality at Lake Bacalar, Mexico

Periodo de realización: 1900/01/01 al 2022/01/01

Tipo: Artículo científico

Lugar(es) de estudio: Laguna Bacalar, Quintana Roo, México
Resumen: "Free-living nematode distribution, abundance, diversity, and biological traits at Lake Bacalar were evaluated to assess theenvironmental quality of the water body. Using an Ekman grab, triplicate sediment samples were collected at 15 samplingsites. Nematodes were identified at family and genus levels, while abundance and diversity indices were calculated. Additionally,functional traits were calculated, and a PCA analysis was applied. The nematode fauna was represented by 6 orders,18 families and 29 genera. Chromadorida had the highest number of taxa (9 genera), followed by Monhysterida (7 genera)and Enoplida (7 genera). Genera richness was higher at coarse sediments, with Simpson index values ranging 3.96-4.60,which were consistent with the Shannon index (H' > 3 bits. ind-1). The maturity index varied from 2.5 to 3.1, with a higherpercentage of cp-3–5 nematodes (> 55%). Multivariate analysis showed three nematode groups, one associated with chlorophylla, pH, salinity, and silicates, the second group with dissolved oxygen, and organic matter, and a third group relatedwith nutrient content in water. Biological traits showed a dominance of deposit feeders (37%) and epistrate feeders (35%).Nematode body shape was represented by slender (39%), medium plump (31%), while conical tails were dominant (68%)and the body length varied from < 500 to 3000 µm, with dominance of lengths > 500-750 (46%) and > 750-1250 (38%),organisms typical of oligotrophic lakes. Nematode assemblages, water chemical characteristics, mainly nutrient concentrations,and biological traits confirm the oligotrophic conditions at Lake Bacalar."

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