CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...
CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ... CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...
LAVANIEGOS-ESPEJO ET AL.: EL NINO EFFECTS ON GULF OF CALIFORNIA EUPHAUSIIDS CalCOFl Rep., Vol. 30,1989 0 0 % 4 ,* YAACH 12-22 Figure 3. Surface salinity distributions (%.) in the Gulf of California. tongues of cool water extended along the eastern coast, and in 1984, on both sides of the gulf. The 1983 temperatures at 30-m depth were 1°C lower than at the surface, but the horizontal gradients were similar at the two levels (figure 5). In contrast, 1984 presented more isotherm distortion at 30-m depth in relation to surface distribution, with temperature differences between coasts as high as 4°C in the southern gulf. The interannual temperature difference persisted at 100-m depth (figure 6), with values about 2°C warmer in 1983 than in 1984. The depth of the 1.5 ml/l dissolved oxygen isopleth in March 1983 (figure 7) increased northward from the mouth (120 m) to the central gulf (>200 m). There are no available data for 1984. Distribution Species populations. Euphausiid mean abundance was 6,869 ind/1000 m3 in March 1983, with eleven species present (table 1). In spring 1984, in the same geographic area (24" to 29"N), euphausiid mean abundance was 29,921 ind/1000 m3. However, for each species, 95% confidence limits for the abundance estimates significantly overlapped between years (table 1). Two species not found inside the gulf (north of 24"N) in 1984 (Nematoscelisgvacilis and Stylocheivon cavinatum) were nevertheless present just outside the mouth, 23"-24"N, in that year. Significant differences between day and night abundances were found only in postlarval Nyctiphanes simplex (p = 0.042) and Euphausia eximia (p = 0.002), with nighttime abundances being greater and, therefore, used to determine abundances of those species. Larvae did not show significant daynight differences in abundance (p > 0.05). Therefore, both day and night samples were used to determine abundances of larvae of all species (table 2). The greater average euphausiid abundance in 1984 was mainly due to the generally coastal species Nyctiphanes simplex, since it constituted 60% of the euphausiids sampled in 1983, and 96% in 1984. Five 76
~~~~~ ~ -~ ~~ ~ ~~~~ ~ Stylocherrotr ~~~~ ~ Species ~~ LAVANIEGOS-ESPEJO ET AL.: EL NINO EFFECTS ON GULF OF CALIFORNIA EUPHAUSIIDS ColCOFl Rep., Vol. 30,1989 .' 0 0 "r .3a p Figure 4. Surface temperature distributions ("C) in the Gulf of California. TABLE 1 1983 and 1984 Mean Abundances (Antilogged), Also Showing Lower (LL) and Upper (UL) 95% Confidence Limits Geographical ~~ range' ~~~ 1983 (N = 17) 1984 (N = 14)' 2 (LL,S%-uL,,%) ~- Yo f (LLYs%-uLY5%) Warm-temperate North Neniafoscelrs drfficilrs 2,555 (1,432-4,560) 37 2 1,120 (243-5,150) 37 Pacific Marginal to eastern Nyctipharres srniplex' 4,133 (995-17,146) 60 2 28,770 (3,108-266,267) 96 1 tropical Pacific Euphansra exinua' 110 (16-718) 16 9 (0-180)
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- Page 38 and 39: SYMPOSIUM INTRODUCTION CalCOFl Rep.
- Page 40 and 41: POLOVINA: ARTIFICIAL REEFS: BENTHIC
- Page 42 and 43: BUCKLEY: ENHANCING MARINE FISHERIES
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~~~~ ~ Stylocherrotr<br />
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Species<br />
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LAVANIEGOS-ESPEJO ET AL.: EL NINO EFFECTS ON GULF OF CALIFORNIA EUPHAUSIIDS<br />
ColCOFl Rep., <strong>Vol</strong>. <strong>30</strong>,<strong>1989</strong><br />
.'<br />
0 0<br />
"r .3a p<br />
Figure 4. Surface temperature distributions<br />
("C) in the Gulf of <strong>California</strong>.<br />
TABLE 1<br />
1983 and 1984 Mean Abundances (Antilogged), Also Showing Lower (LL) and Upper (UL) 95% Confidence Limits<br />
Geographical<br />
~~ range' ~~~<br />
1983 (N = 17) 1984 (N = 14)'<br />
2 (LL,S%-uL,,%) ~- Yo f (LLYs%-uLY5%)<br />
Warm-temperate North Neniafoscelrs drfficilrs 2,555 (1,432-4,560) 37 2 1,120 (243-5,150) 37<br />
Pacific<br />
Marginal to eastern Nyctipharres srniplex' 4,133 (995-17,146) 60 2 28,770 (3,108-266,267) 96 1<br />
tropical Pacific Euphansra exinua' 110 (16-718) 16 9 (0-180)
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