By Fritz Trillmich, Kathryn A. Ono
El Niño is a meteorological and oceanographic phenomenon, which happens at abnormal durations within the jap tropical Pacific. Its most evident attribute is the warming of floor waters, which motives huge, immense disturbances of the marine surroundings. A serious Niño can also have an effect on continental structures around the world. This publication gathers in a complete method the data on hand at the results of the awfully robust 1982-83 Niño on a gaggle of marine mammals, the pinnipeds. It provides an research of the consequences of environmental tension at the populations of most sensible predators. info and interpretations are in line with a most original selection of long term reviews of pinniped inhabitants dynamics, habit and ecology which spanned the El Niño occasion. The responses of pinniped populations to the El Niño disturbance of the marine environment additionally has vital implications for the administration and conservation of marine mammal populations.
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Extra resources for Pinnipeds and El Nino: Responses to Environmental Stress
Runs farther to the north were not unusually depressed, and in Alaska good pro duction was recorded during these years. The 1982-83 EN may have altered migration patterns of salmonids in the ocean. The migration of Fraser River sockeye around Vancouver Island is the classic example of migratory pathways that are related to ocean temperatures. During the recent years of high sea level and warm sea temperatures, a high percentage of the run has returned through the northern passage on the east side rather than along the west side of Vancouver Island (Groot and Quinn 1987).
1988) Haist et al. (1988) Haist et al. (1988) Haist et al. (1988) Haist et al. (1988) 1983 - Average 1984- Weak Year-c\ass strength 1983/84 - Average Haist et al. (1988) Haist et al. (1988) 1983/84 - Low Northwest Vancouver Is. C. Co ast Haist et al. (1988) 1983/84 - Average Availability abundance Southwest Vancouver Is. Species/stocks Table 2. (continued) w ~ ~ N' ~ >-.... ::l N Central British Columbia Sockeye Barkley Sound, Re. e. J ohnson (1988) PFMC (1989) PFMC(1989) PFMC (1985) 1983 - Low 1984 - Low 1984 - Low Johnson (1988) Nicholas and Hankin (1988) Johnson (1988), PFMC (1984) 1983 - Low 1983 - Average+ Northern Oregon Columbia River Tule Coho Oregon prod.
The species composition of zooplankton was altered during the 1983 summer off Oregon, with a persistence of southern species, which typically disappear in the summer (Miller et al. 1985). The abundance of larval fish was several times lower off Oregon during the summer of 1983 and the species composition was unusual. Species of larvae normally found offshore were found inshore, and the inshore species were reduced in abundance. Northern anchovy larvae (Engraulis mordax) were abundant in April 1983, months earlier than in previous years.