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3. Lepeophtheirus simplex sp. n., a caligid copepod (Siphonostomatoida) parasitic on ''botete'' (bullseye puffer, Sphoeroides annulatus) in Sinaloa, Mexico

Creator:
Ho, Ju-shey, Gómez, Samuel, and Fajer-Avila, Emma
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Lepeophtheirus simplex, fish parasite, parasitic copepod, Caligidae, and Mexico
Language:
English
Description:
A new species of caligid copepod, Lepeophtheirus simplex sp. n., parasitic on bullseye puffer, Sphoeroides annulatus (Jenyns) in Sinaloa, Mexico is described. The new species is distinguished from its congeners by the possession of (1) a maxillule with simple dentiform process; (2) a sternal furca with sharply pointed, curved tines; (3) a 2-segmented exopod of leg 3 with simple, slender spine on proximal segment; (4) a 3-segmented exopod of leg 4 with a long proximal, outer spine; and (5) the terminal claw of male antenna with a large, tridentate, medial protuberance.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Natural and anthropogenic factors shape metazoan parasite community structure in mummichog (Fundulus heteroclitus) from two estuaries in New Brunswick, Canada

Creator:
Blanar, Christopher A., Marcogliese, David J., and Couillard, Catherine M.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
parasites, communities, Fundulus heteroclitus, pollution, salinity, pulpmill effluent, and municipal sewage
Language:
English
Description:
Previously published multidisciplinary studies in the Miramichi and Bouctouche rivers (New Brunswick, Canada) noted significant changes in fish health parameters, including elevated tissue levels of organic contaminants and a wide range of physiological disturbances, in mummichog Fundulus heteroclitus (L.) from a site on the Miramichi River that received bleached kraft pulpmill and municipal effluent. The present study reports differences in the abundance of individual parasite species, as well as parasite infracommunity and component community composition, in mummichog from both rivers. These differences were evaluated in relation to host (size, condition, immune function, tissue organochlorine contaminant levels) and environmental (faecal coliform counts, salinity, temperature) data derived from the previously published studies. Overall, 18 parasite species were identified, the most common of which were Ascocotyle sp. larv., Ornithodiplostomum sp. larv., Posthodiplostomum sp. larv., and Proteocephalus filicollis (Rudolphi, 1802). There were broad differences in parasite community structure and composition between rivers and within rivers, the most prominent pattern being a pronounced difference between sites in the upper and lower estuary of each river that was likely driven by salinity. Mean infracommunity richness was also positively related to faecal coliforms (considered here as a surrogate measure of eutrophication via municipal sewage), and both were highest at the most polluted site. We noted no other significant relationships. Thus our data suggest that the parasite communities in these two estuaries were primarily structured by large upstream / downstream ecological gradients in salinity, and secondarily by eutrophication due to pollution by municipal and industrial effluents. Overall, our results highlight the value of coordinated multidisciplinary studies for understanding the factors that shape parasite abundance and community structure.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public