[논문]Distribution Pattern of Zooplankton in the Han River Estuary with respect to Tidal Cycle

Youn, Seok-Hyun; Choi, Joong-Ki

doi:10.1007/bf03020694

[국내논문] Distribution Pattern of Zooplankton in the Han River Estuary with respect to Tidal Cycle 원문보기

Ocean science journal : OSJ, v.43 no.3, 2008년, pp.135 - 146

Youn, Seok-Hyun (Environment Research Division, East Sea Fisheries Research Institute, NFRDI) , Choi, Joong-Ki (Department of Oceanography, Inha University)

Abstract ▼ AI-Helper

The monthly distribution of zooplankton communities in Han River estuary was investigated at two stations from July 1998 to June 1999. Monthly mean abundance of total zooplankton varied remarkably, with the range from 20 $indiv.{\cdot}m^{-3}$ to 19,600 $indiv.{\cdot}m^{-3}$. During the study period, dominant species of zooplankton community were dinoflagellate Noctiluca scintillans, copepods Paracalanus indicus, Paracaanus crassirostris, Acartia hongi, Acartia ohtsukai, and meroplanton cirriped larvae. According to tidal states, relative high abundance occurred at high tide without regard to season. The temporal distribution of abundance implied that the reduced salinity probably limited the zooplankton populations and the fluctuations of salinity were an important factor in the variation of abundance. However, the results of salinity tolerance test shows that the variations in salinity do not directly influence the decrease of abundance. This study shows that the relatively high abundance of zooplankton near high tide seems to be related with the expansion of abundant zooplankton inhabiting Incheon coastal waters through tidal currents.

주제어

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문제 정의

We express our gratitude to Dr. W.D. Yoon and Dr. G.S. Park for providing us with the comments on this manuscript. We also thank Mr.

제안 방법

This study would be dealt with the monthly distribution of zooplankton community in Han River estuary with respect to tidal states and discussed the temporal distribution patterns of the community, with relations to temperature and salinity.
To evaluate the salinity tolerance of dominant copepods inhabiting Han River estuary, zooplankton was sampled severally from 24 March to 2 April 2002 in Incheon coastal waters by oblique hauls with a 200 µm conical net, then transported to the laboratory in cold boxes filled with 15 l of surface water (30.8±0.9 psu).

대상 데이터

All experiments were run at ambient field temperature (6.2±1.8 o C) and three replicates were prepared.
These experiments were repeated three times, respectively. In the latter experiment, active 400~500 individuals in Acartia hongi of mixed stages (mainly late copepodtes and adults) were prepared in each container. Copepods were placed initially in three 5 l beakers with GF/C filtered seawater at 31 psu.
The samplings were carried out at two stations in channels located in Han River estuary from July 1998 to June 1999 (Fig. 1). Temperature and salinity were measured with a salinity meter (YSI, Model 30) at 1 m depth.
1. The station map located in Han River estuary. C (Fig.

데이터처리

As the statistical analysis of laboratory, analysis of variance (ANOVA) was used for the detection of any significant mortality differences in each salinity range. If the results from ANOVA were statistically significant, multiple comparison procedure (Tukey-test) was used in this study.

성능/효과

10). According to our results, Acartia hongi was shown to have higher adaptive ability than Paracalanus crasisrostris and P. indicus. It is common that the changes of salinity in the field are rather gradual than abrupt.
In conclusion, the temporal distribution of zooplankton community in Han River estuary varied surprisingly with respect to tidal cycle. The zooplankton communities in the study waters were mainly comprised of estuarine-marine species.
, 1991). In mixo-oligohaline zone (0.5~5 psu), Thermocyclops hyalinus, Pseudodiaptomus poplesia (as P. inopinus) and Sinocalanus sinensis were abundant, and Acartia hudsonica, Acartia ohtsukai (as A. pacifica, personal communication with Soh H.Y.), Centropages abdominalis, Centropages tenuiremis, Labidocera euchaeta, Tortanus derjugini (as T. spinicaudatus) and Corycaeus affinis mainly occurred in mixo-mesohaline zone (5~28 psu). Otherwise, in mixoeuhaline zone (>28 psu), Calanus sinicus, Labidocera bipinnata, Acartia omorii and Oithona similes occurred frequently.
On the other hand, for Paracalanus crassirostris, the mortality showed a significant increase at 22 psu (ANOVA tukey-test, p<0.05), and, for P. indicus, a significant increase of mortality occurred at 25 psu (ANOVA tukey-test, p<0.05).
The proportions of Paracalanus crassirostris were 5% in Yeomha channel and 21% in Seokmo channel and those of Paracalanus indicus were 7% in both channels.

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원문보기 상세보기
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