RESUMO
Aquatic ecosystems around the world face serious threats from anthropogenic contaminants. Results from 8 years of field and laboratory investigations indicate that sublethal contaminant exposure is occurring in the early life stages of striped bass in the San Francisco Estuary, a population in continual decline since its initial collapse during the 1970s. Biologically significant levels of polychlorinated biphenyls, polybrominated diphenyl ethers, and current-use/legacy pesticides were found in all egg samples from river-collected fish. Developmental changes previously unseen with standard methods were detected with a technique using the principles of unbiased stereology. Abnormal yolk utilization, brain and liver development, and overall growth were observed in larvae from river-collected fish. Histopathological analyses confirmed and identified developmental alterations. Using this methodology enabled us to present a conclusive line of evidence for the maternal transfer of xenobiotics and their adverse effects on larval striped bass in this estuary.
Assuntos
Bass/crescimento & desenvolvimento , Larva/efeitos dos fármacos , Poluentes da Água/toxicidade , Xenobióticos/toxicidade , Animais , Feminino , Pesqueiros , Éteres Difenil Halogenados/toxicidade , Larva/crescimento & desenvolvimento , Masculino , Oceanos e Mares , Óvulo/efeitos dos fármacos , Praguicidas/toxicidade , Bifenilos Policlorados/toxicidade , Rios , São Francisco , Saco Vitelino/efeitos dos fármacosRESUMO
Capnocytophaga cynodegmi is a zoonotic, gram-negative, capnophilic bacterium that is usually seen in people with infections associated with dog or cat bites. The first reported case of C. cynodegmi infection in a dog is described here.