Th e aims of this study were to determine whether the prevalence of the parasitic isopod Bopyrina abbreviata Richardson,1904 in the decapod Hippolyte zostericola Smith, 1873, varies intra-annually in the estuarine lagoon system of the NaturalProtected Area Laguna de Terminos (Mexico) and whether this variability was related to changes in environmental conditions. Hippolyte zostericola collections were carried out (monthly during an annual cycle, 2011-2012) at three shallow sites of seagrass meadows (Th alassia testudinum Banks ex König, 1805). Th e environmental factors measured were water temperature, salinity, dissolved oxygen, pH, and rainfall. In general, the physicochemical data measured at the sampling sites were similar throughout the annual cycle (temperature: 30.6–25.8°C, salinity: 39.5–18.6 ups, dissolved oxygen: 9.6–5.4 mg L-1, pH: 8.7–8.2, rainfall: 240–5.4 mm). O...

Th e aims of this study were to determine whether the prevalence of the parasitic isopod Bopyrina abbreviata Richardson,1904 in the decapod Hippolyte zostericola Smith, 1873, varies intra-annually in the estuarine lagoon system of the NaturalProtected Area Laguna de Terminos (Mexico) and whether this variability was related to changes in environmental conditions. Hippolyte zostericola collections were carried out (monthly during an annual cycle, 2011-2012) at three shallow sites of seagrass meadows (Th alassia testudinum Banks ex König, 1805). Th e environmental factors measured were water temperature, salinity, dissolved oxygen, pH, and rainfall. In general, the physicochemical data measured at the sampling sites were similar throughout the annual cycle (temperature: 30.6–25.8°C, salinity: 39.5–18.6 ups, dissolved oxygen: 9.6–5.4 mg L-1, pH: 8.7–8.2, rainfall: 240–5.4 mm). O...