본문 바로가기 주메뉴 바로가기
22대 대한민국 국회 국회정보길라잡이 국회의원검색
회원가입 로그인
HOME

정보검색

소장정보 검색

국회도서관 홈으로 정보검색 소장정보 검색

결과 내 검색

동의어 포함

고급검색

인명/단체명

저자정보 상세정보
인명/단체명을 입력하세요.

키워드

  • 대표어

  • 외국어

-

목차보기

표제지

목차

1. 서론 9

2. 재료 및 방법 12

정점 선정 및 시기 12

환경요인 측정 14

영양염 및 chlorophyll a 측정 14

동물플랑크톤 채집 14

사망률 측정 15

염분내성한계 측정 16

통계 분석 16

3. 결과 17

강우량 및 담수 방류량 변화 17

수온 및 염분 변화 19

영양염 농도 변화 23

Chlorophyll a 농도 변화 26

동물플랑크톤 분포 28

집괴분석 결과 36

우점 요각류의 사망률 37

우점 요각류의 염분 내성 37

4. 토의 43

영양염과 식물플랑크톤의 관계 43

수온, 염분과 동물플랑크톤 분포의 관계 47

식물플랑크톤과 동물플랑크톤 분포의 관계 51

담수방류에 따른 주요 우점 요각류의 사망률과 염분내성한계 53

5. 결론 56

참고문헌 57

ABSTRACT 65

표목차

Table 3-1. List and abundance (indiv./㎥) of zooplankton. Abundance data are pooled... 31

Table 3-2. Mortality of adult calanoid copepods (M, %) and number of... 38

Table 3-3. Mortality of Paracalanus parvus s. 1. (M, %) and number... 39

Table 3-4. Mortality of Acartia hongi (M, %) and number of... 40

Table 4-1. Correlation coefficients (r) between nutrients and chlorophyll a concentrations in Cheonsu Bay. 46

Table 4-2. Correlation coefficients (r) between environmental factors and zooplankton abundances in Cheonsu... 50

Table 4-3. Ranges of seawater temperatures (T, ℃) and salinities (S, psu) of copepod... 55

그림목차

Fig. 2-1. Map of sampling stations in Cheonsu Bay. 13

Fig. 3-1. Precipitation and freshwater discharge in Cheonsu Bay during the study period. Vertical arrows... 18

Fig. 3-2. Seawater temperatures at surface (A) and near bottom (B) in Cheonsu Bay from June 27 to... 21

Fig. 3-3. Salinities at surface (A) and near bottom (B) in Cheonsu Bay from June 27 to September 1, 2012. 22

Fig. 3-4. Spatio-temporal variations of nitrite+nitrate (A), ammonia (B),... 25

Fig. 3-5. Spatio-temporal variations of chlorophyll a concentrations at surface (A) and near bottom (B) in... 27

Fig. 3-6. Spatio-temporal variations of total zooplankton abundance... 32

Fig. 3-7. Spatio-temporal variations of total zooplankton abundance... 33

Fig. 3-8. Spatio-temporal variations of total zooplankton abundance... 34

Fig. 3-9. Abundance distribution (indiv./㎥) of major zooplankton taxa... 35

Fig. 3-10. Dendrogram showing the degree of co-occurrence among... 36

Fig. 3-11. Survival of Paracalanus parvus s. 1. in different salinities with lapse of time. Vertical bars are 95%... 41

Fig. 3-12. Survival of Acartia hongi in different salinities with lapse of time. Vertical bars are 95% confidence... 42

초록보기

 There are two large artificial lakes in the northern Cheonsu Bay, from which significant amount of freshwater was abruptly discharged during the rainy season. This study was to examine the impact of this abrupt freshwater discharge on zooplankton ecosystem.

Temporal changes were relatively gradual in seawater temperature than in salinity. After freshwater discharge, nutrient concentrations increased up to about twice and resultant increase of chlorophyll a concentrations followed within about 10 days. Zooplankton that feed on phytoplankton was numerically increased subsequently.

The rapid salinity changes, on the contrary, seemed to cause zooplankton mortality. Although fast sinking of carcass made it difficult to estimate reliable mortality caused by salinity shock, maximum mortality of copepods up to 40% was observed from the field observations. The salinity tolerance limits of Acartia hongi and Paracalanus parvus s. l. obtained in the laboratory seemed to be about 7 and 14 psu, respectively.

It was summarized that abrupt freshwater discharge had both positive and negative impacts on zooplankton. Positive one was the numerical response of zooplankton by the increased food supply (chlorophyll a), which resulted from nutrient supply of freshwater discharge. Negative one was increased mortality by sudden changes in salinity.

추천서가 (다양한 추천 자료를 만나보세요)

권호기사보기

권호기사 목록 테이블로 기사명, 저자명, 페이지, 원문, 기사목차 순으로 되어있습니다.
기사명 저자명 페이지 원문 기사목차

권호

기사명 원문보기 기사목차
닫기