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Table 1 Hydrographic variables (at 5-m depth) and average abundance, RA, and OR of the Thaliacea in 2004

From: Influence of monsoon-driven hydrographic features on thaliacean distribution in waters around Taiwan, western North Pacific Ocean

Species Winter Summer
Mean ± SE RA OR Mean ± SE RA OR
  (individuals/1,000 m3) (%) (%) (individuals/1,000 m3) (%) (%)
Thalia rhomboides 454 ± 160 43.77 61.76 1,026 ± 404 32.13 82.35
Doliolum denticulatum 313 ± 96 30.15 97.06 634 ± 235 19.84 97.06
Doliolum nationalis 0 0 0 728 ± 547 22.81 14.71
Thalia orientalis 77 ± 29 7.43 61.76 207 ± 40** 6.49 76.47
Pyrosoma verticillatum 4 ± 4 0.35 2.94 232 ± 161 7.25 17.65
Thalia democratica 37 ± 11 3.53 50.00 134 ± 37* 4.21 79.41
Thalia cicar 50 ± 16 4.80 61.76 50 ± 12 1.57 64.71
Weelia cylindrica 4 ± 4 0.40 2.94 67 ± 29* 2.09 38.24
Salpa fusiformis 48 ± 25 4.65 44.12 12 ± 8 0.39 23.53
Iasis zonaria 14 ± 9 1.38 20.59 0 0 0
Salpa younti 0 0 0 13 ± 5* 0.40 26.47
Cyclosalpa sewelli 0 0 0 10 ± 4* 0.31 17.65
Dolioletta gegenbauri 3 ± 2 0.30 5.88 1 ± 1 0.04 2.94
Brooksia rostrata 2 ± 2 0.17 5.88 1 ± 1 0.03 2.94
Traustedtia multitenticulata 2 ± 2 0.16 5.88 1 ± 1 0.02 2.94
Doliolina mulleri 1 ± 1 0.08 5.88 1 ± 1 0.04 2.94
Pegea confoederata 0 0 0 1 ± 1 0.02 2.94
Cyclosalpa affinis 0 0 0 0.1 ± 0.1 0.004 2.94
Unidentified old nurse 29 ± 6 2.79 61.76 74 ± 14** 2.33 85.29
Unidentified Thaliacea 1 ± 0.4 0.05 5.88 1 ± 1 0.03 11.76
Total thaliaceans 1,037 ± 224 100 - 3,193 ± 705** 100 -
Species number 4.3 ± 0.4    5.7 ± 0.4*   
Species diversity 0.9 ± 0.1    1.0 ± 0.1   
Temperature (°C) 22.74 ± 0.45    28.96 ± 0.17***   
Salinity 34.24 ± 0.09    34.14 ± 0.04   
Chlorophyll a (μg/L) 0.12 ± 0.04    0.06 ± 0.02   
  1. RA, relative abundance; OR, occurrence rate. Asterisks indicate a significant difference between seasons according to an ANOVA at *p < 0.05, **p < 0.01, and ***p < 0.001.