Temperature effects on hatching and viability of Juvenile Gill Lice, Salmincola californiensis.

Autor: Vigil EM; Colorado Cooperative Fish & Wildlife Research Unit, Colorado State University, Fort Collins, CO, USA., Christianson KR; Aquatic Research, Colorado Parks and Wildlife, Fort Collins, CO, USA., Lepak JM; Aquatic Research, Colorado Parks and Wildlife, Fort Collins, CO, USA., Williams PJ; Department of Fish, Wildlife and Conservation Biology, Colorado State University, Fort Collins, CO, USA.; Department of Statistics, Colorado State University, Fort Collins, CO, USA.
Jazyk: angličtina
Zdroj: Journal of fish diseases [J Fish Dis] 2016 Jul; Vol. 39 (7), pp. 899-905. Date of Electronic Publication: 2015 Nov 05.
DOI: 10.1111/jfd.12422
Abstrakt: Salmonids of the genus Oncorhynchus, distributed throughout the Pacific Rim, can be infected by the gill lice species Salmincola californiensis (Dana, 1852), which makes them one of the most broadly distributed gill lice species. Despite their broad distribution and valuable obligate salmonid hosts, relatively little is known about S. californiensis. We evaluated effects of temperature on timing of S. californiensis hatching and survival of copepodids, and provide information on brood size and variability. Our results suggest that temperature was a primary driver of timing of S. californiensis hatching and post-hatching survival. Prior to this study, the free-swimming stage of S. californiensis was reported to survive approximately 2 days without a suitable host. We observed active copepodids 13 days after hatch with some individuals from most (>90%) viable egg sacs at all temperature treatments surviving ≥5 days. Our findings indicate that warmer temperatures could increase development rates of gill lice at certain life stages, potentially increasing fecundity. This information coupled with predictions that warmer water temperatures could intensify crowding of coldwater fishes, stress, and parasite transmission suggests that climate change could exacerbate negative effects of S. californiensis on ecologically and economically important salmonids.
(© 2015 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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