Seasonal Variation in the Abundance of the Demersal Copepod Pseudodiaptomus sp. (Calanoida, Pseudodiaptomidae) in the Seomjin River Estuary, Southern Korea

  • Park Eun Ok (Department of Oceanography, Chonnam National University) ;
  • Suh Hae-Lip (Department of Oceanography, Chonnam National University) ;
  • Soh Ho Young (Bioresources Utilization Program, Yosu National University)
  • 발행 : 2005.12.01

초록

We conducted a year-long survey in 2000 to examine seasonal fluctuations in the abundance of the demersal copepod Pseudodiaptomus sp., the dominant copepod in the Seomjin River estuary, where the spring tide strongly affects changes in salinity gradients. Pseudodiaptomus sp. was found throughout the year in the entire range of salinities measured, but most individuals appeared at oligohaline conditions below 5.0 psu, and less than $2\%$ were observed in polyhaline conditions above 18.0 psu. The peak abundance occurred during autumn in oligohaline waters, and the density was relatively low during the rainy season in summer. In spring and autumn, copepodites were most abundant in oligohaline waters, although they were also fairly abundant in mesohaline conditions $(5\~18\;psu)$. Females with egg sacs appeared in oligo- and mesohaline waters during spring and autumn but were seldom found in polyhaline conditions throughout the year. Our results indicate that, despite the strong physical influence of the tide, Pseudodiaptomus sp. can manipulate its position to remain at its preferred salinity. We also found that spawning mainly occurred in oligohaline waters twice a year.

키워드

참고문헌

  1. Barlow JP. 1955. Physical and biological processes determining the distribution of zooplankton in a tidal estuary. Biol. Bull. 109:211-225 https://doi.org/10.2307/1538722
  2. Bucklin A, BW Frost and TD Kocher. 1995. Molecular systematics of six Calanus and three Metridia species (Calanoida: Copepoda). Mar. Biol. 121:655-664 https://doi.org/10.1007/BF00349301
  3. Castel J and J Veiga. 1990. Distribution and retention of the copepod Eurytemora affinis hirundoides in a turbid estuary. Mar. Biol. 107:119-128 https://doi.org/10.1007/BF01313249
  4. Chang CY and HS Kim. 1986. The freshwater calanoida (Crustacea: Copepoda) of Korea. Korean J. Syst. Zool. 2: 49-62
  5. Collins NR and R Williams. 1981. Zooplankton of the Bristol Channel and Severn Estuary. The distribution of four copepods in relation to salinity. Mar. Biol. 64:273-283
  6. Cronin LE, JC Daiber and EM Hulbert. 1962. Quantitative seasonal aspects of zooplankton in the Delaware River Estuary. Chesapeake Sci. 3:63-93 https://doi.org/10.2307/1351221
  7. Day JW, CA Hall, WM Kemp and AY Arancibia. 1989. Estuarine Ecology. John Wiley & Sons, New York, 559pp
  8. Durbin EG, AG Durbin and RG Campbell. 1992. Body size and egg production in the marine copepod Acartia hudsonica during a winter-spring diatom bloom in Narragansett Bay. Limnol. Oceanogr. 37:342-360 https://doi.org/10.4319/lo.1992.37.2.0342
  9. Engstrm, J, M Koski, M Viitasalo, M Reinikainen, S Repka and K sivonen. 2000. Feeding interactions of the copepods Eurytemora affinis and Acartia bifilosa with the cyanobacteria Nodularia sp. J. Plankton Res. 22:1403-1409 https://doi.org/10.1093/plankt/22.7.1403
  10. Gasparini S and J Castel. 1997. Autotrophic and heterotrophic nanoplankton in the diet of the estuarine copepods Eurytemora affinis and Acartia bifilosa. J. Plankton Res. 19:877-890 https://doi.org/10.1093/plankt/19.7.877
  11. Hough AR and E Naylor. 1991. Field studies on retention of the planktonic copepod Eurytemora affinis in a mixed estuary. Mar. Ecol. Prog. Ser. 76:115-122 https://doi.org/10.3354/meps076115
  12. Jerling HL and TH Wooldridge. 1991. Population dynamics and estimates of production for the calanoid copepod Pseudodiaptomus hessei in a warm temperate estuary. Estuar. Coast. Shelf Sci. 33:121-135 https://doi.org/10.1016/0272-7714(91)90002-S
  13. Kimmerer WJ, JR Burau and WA Bennett. 1998. Tidally oriented vertical migration and position maintenance of zooplankton in a temperate estuary. Limnol. Oceanogr. 43:1697-1709 https://doi.org/10.4319/lo.1998.43.7.1697
  14. Kim KS, JB Lee, KS Lee, JW Kang and HB Yoo. 2000. Ecological study of the Copepoda community in the lower Seomjin River System, Korea. Korean J. Limnol. 33:176-186
  15. Lance J. 1963. The salinity tolerance of some estuarine planktonic copepods. Limnol. Oceanogr. 8:440-449 https://doi.org/10.4319/lo.1963.8.4.0440
  16. Laprise R and JJ Dodson. 1994. Environmental variability as a factor controlling spatial patterns in distribution and species diversity of zooplankton in the St. Lawrence Estuary. Mar. Ecol. Prog. Ser. 107:67-81 https://doi.org/10.3354/meps107067
  17. Liang D and S Uye. 1997a. Seasonal reproductive biology of the egg-carrying calanoid copepod Pseudodiaptomus marinus in a eutrophic inlet of the Inland Sea of Japan. Mar. Biol. 128:409-414 https://doi.org/10.1007/s002270050106
  18. Liang D and S Uye. 1997b. Population dynamics and production of the plankton cope pods in an inlet of the Inland Sea of Japan. IV. Pseudodiaptomus marinus, the egg-carrying calanoid. Mar. Biol. 128:415-421 https://doi.org/10.1007/s002270050107
  19. Soh HY, H-L Suh, OH Yu and S Ohtsuka. 2001. The first record of two demersal calanoid copepods, Pseudodiaptomus poplesia and P. nihonkaiensis in Korea, with remarks on morphology of the genital area. Hydrobiologia 448:203-215 https://doi.org/10.1023/A:1017561607848
  20. Suh H-L, HY Soh and SS Cha. 1991. Salinity and distribution of zooplankton in the estuarine system of Mankyong River and Dongjin River. J. Oceanol. Soc. Korea 26: 181-192
  21. Ueda H, A Terao, M Tanaka, M Hibino and Md S Islam. 2004. How can river-estuarine planktonic copepods survive river floods? Ecol. Res. 19:625-632 https://doi.org/10.1111/j.1440-1703.2004.00677.x
  22. Uye S, Y Iwai and S Kasahara. 1982. Reproductive Biology of Pseudodiaptomus marinus (Copepoda: Calanoida) in the Inland Sea of Japan. Bull. Plankton Soc. Japan 29:25-35
  23. Uye S, T Shimazu, M Yamamuro, Y Ishitobi and H Kamiya. 2000. Geographical and seasonal variations in mesozooplankton abundance and biomass in relation to environmental parameters in Lake Shinji-Ohashi River-Lake Nakaumi brackish-water system, Japan. J. Mar. Syst. 26:193-207 https://doi.org/10.1016/S0924-7963(00)00054-3
  24. Wooldridge T and R Melville-Smith. 1979. Copepod succession in two South African estuaries. J. Plankton Res. 1: 329-341 https://doi.org/10.1093/plankt/1.4.329
  25. Wooldridge T and T Erasmus. 1980. Utilization of tidal currents by estuarine zooplankton. Estuar. Coast. Mar. Sci. 11:107-114 https://doi.org/10.1016/S0302-3524(80)80033-8