[논문]저층수 용존산소가 당동만 저서다모류군집 구조의 시간적 변동에 미친 영향

양진경; 신현출

doi:10.4217/opr.2020.42.3.233

저층수 용존산소가 당동만 저서다모류군집 구조의 시간적 변동에 미친 영향
The Influence of the Dissolved Oxygen of Bottom Water on the Temporal Variation of the Benthic Polychaetous Community Structure in Dangdong Bay 원문보기

Ocean and polar research, v.42 no.3, 2020년, pp.233 - 247

양진경 (전남대학교 수산해양대학 해양융합과학과) , 신현출 (전남대학교 수산해양대학 해양융합과학과)

Abstract ▼ AI-Helper

This study was carried out at 5 sites 11 times over two years to identify the variation of benthic environments and benthic polychaetous community and analyze the benthic healthiness in Dangdong Bay, a small semi-enclosed inner bay of Jinhae Bay. The temperature of bottom water showed the typical temporal fluctuation of a temperate zone and was in the range of 5.94 ~ 23.94℃. The salinity did not change significantly during the study period and was in the range of 32.93 ~ 35.72 psu. The concentration of dissolved oxygen of bottom water fluctuated a great deal and was in the range of 0.31 ~ 10.20 mg/L. The lowest DO value was recorded in July 2015, as 0.31±0.04 mg/L corresponding to the hypoxic water mass. The hypoxic water mass was formed continuously at some sites also in July and August 2016. The mean grain size was in the range of 7.57 ~ 9.81Ø and the average was 8.89±0.20Ø. The surface sediments were mainly composed of fine sediment (mud) above 85%. The mean of TOC was 3.09±0.22% and LOI was 13.30±0.47%, showing very high levels in Korean coastal waters. The concentration of AVS was in the range of 0.33 ~ 1.28 mgS/g-dry. The high values of organic contents and AVS indicated that there had been the serious organic enrichment in Dangdong Bay. The number of species and the density of the benthic polychaetous community in Dangdong Bay were in the range of 2 ~ 38 species and 2 ~ 2,185 ind./㎡ during the study period. The number of species and density were highly sustained in winter and spring, and then decreased gradually with the formation of a hypoxic water mass in summer, and the lowest number of species and density were recorded in autumn. In September and November 2015, the dead zone expanded to almost the whole study area. Dominant polychaetous species were Capitella capitata, Lumbrineris longifolia, Paraprionospio patiens and Sigambra tentaculata, each known as opportunistic species and potential organic pollutant indicator species. In particular, Paraprionospio patiens showed a very high population density of 2,019 ind./㎡ in December 2016. Polychaetous communities at each sampling time were classified into 4 temporal groups according to dominant species in each period by cluster analysis and nMDS. 'Period Group AI' was formed in winter and spring of 2015, dominated by Capitella capitata, 'Period AII' in summer dominated by Lumbrineris longifolia, 'Period B' in autumn with no fauna in the dead zone, and particularly 'Period C' in winter of 2016 dominated by Paraprionospio patiens. As a result of analysis of benthic healthiness, the study area was estimated to be in a Fair~Very Poor condition by AMBI and in a Poor~Very Poor condition by BPI during the study period. Both AMBI and BPI showed that the study area was in a Very Poor condition in September and November 2015, and when the dead zone occurred. In Dongdong Bay, the fact that the formation of a hypoxic water mass occurred in summer and a dead zone in autumn were confirmed. In addition, the dominance of opportunistic and organic pollutant indicator species was also observed clearly. The benthic healthiness indexes such as AMBI and BPI showed that organic enrichment was serious in Dangdong Bay.

주제어

표/그림 (11)

그림 Fig. 1. A map showing the sampling stations and bathymetry in Dangdong Bay
그림 Fig. 2. Temporal variations of temperature (℃), salinity (psu) and dissolved oxygen (mg/L) of bottom water in Dangdong Bay
표 Table 1. The classification criteria of each benthic biotic index
그림 Fig. 3. Temporal variations of mean grain size, TOC, LOI, AVS, chl-a and phaeo-pigment of surface sediment in Dangdong Bay
그림 Fig. 4. Temporal variations of species number and density of benthic polychaetous community in Dangdong Bay
그림 Fig. 5. Temporal variations of ecological indices in Dang-dong Bay
표 Table 2. Density variations of four dominant benthic polychaetes collected in the Dangdong Bay (Unit: ind./m²)
그림 Fig. 6. Dendrogram of sampling periods from cluster analysis and two dimensional plot from the non-multidimensional scaling ordinations (nMDS) based on the benthic polychaetous species composition with sampling period
표 Table 3. Environmental and biological parameters f or e ach period group s eparated b y cluster analysis based on the benthic polychaetous species composition data in Dangdong Bay
그림 Fig 7. Dendrogram and table of sampling site from cluster analysis based on the Bray-Curtis similarity based on the benthic polychaetes data of Dangdong Bay.
그림 Fig. 8. Temporal variations of AMBI(Azti's Marine Biotic Index)and BPI (Benthic Pollution Index) in Dangdong Bay. The colors indicate the grades of benthic ecological quality status as ☐ Excellent, ☐ Good, ☐ Fair, ☐ Poor and ☐ Very Poor

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저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

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