[논문]남해안 봉강천과 미룡천 하구에서 기수갈고둥의 분포 및 서식지 환경 특성

장건강; 김민섭; 조수근; 이원호; 김형섭

doi:10.4217/opr.2021.43.3.127

남해안 봉강천과 미룡천 하구에서 기수갈고둥의 분포 및 서식지 환경 특성
Habitat Environments and Spatiotemporal Distribution of Clithon retropictum at the Estuaries of Bonggang and Miryoung Streams in the Southern Coast of Korea 원문보기

Ocean and polar research, v.43 no.3, 2021년, pp.127 - 140

장건강 (군산대학교 해양과학대학 해양생명응용과학부) , 김민섭 (국립해양생물자원관 해양생물연구본부) , 조수근 (군산대학교 해양과학대학 해양생명응용과학부) , 이원호 (군산대학교 해양과학대학 해양생명응용과학부) , 김형섭 (군산대학교 해양과학대학 해양생명응용과학부)

Abstract ▼ AI-Helper

At the estuaries of Bonggang and Miryong streams in the Korean southern coast, the spatiotemporal distribution and habitat environment of a nerite snail, Clithon retropictum (Gastropoda: Neritidae), which has been assigned as a legally protected species of Korea, were explored. Physicochemical environmental factors such as water temperature, salinity, tidal level distribution as well as biotic environments (chlorophyll-a concentration and epilithic microalgae composition) were monitored every month. The relationships between the environmental factors and spatiotemporal distribution of the nerite snail population were analyzed. Water temperature, salinity, and water level varied by season and lunar tidal rhythm. The spatiotemporal distribution of the nerite snail was mostly related to water salinity. Among epilithic algae which were the priority prey of snails, blue-green algae and green algae dominated in summer and autumn, while diatoms predominated during winter and spring. Chlorophyll-a concentration was highly and positively correlated with the population density of the nerite snail. The correlation coefficients were different depending on the taxon (Family) of epilithic algae. The mean population density was 302.2 inds m-2 and 271.8 inds m-2 in Bonggang Stream and Miryong Stream, respectively. The egg capsules of the nerite snail in the two habitats were observed from March (in Bonggang Stream) or April (in Miryong Stream) to August, and newly hatched juveniles recruited in the habitats from August were assessed with regard to frequency distributions of shell width. The occurrence of large-sized snails in upper stream reaches of both Bonggang and Miryong indicated the movement of spats from the mouth to the upper reaches during the whole life cycle.

주제어

표/그림 (14)

그림 Fig. 1. Maps showing the study area (a: Bonggang Stream, b: Miryong Stream, ▲: Mooring site)
그림 Fig. 2. Monthly variations in water temperature and salinity at sampling sites (△: St. 1, □: St. 2, ◇: St. 3, ○: St. 4) of Bonggang Stream (a, b) and Miryong Stream (c, d)
그림 Fig. 3. Time series of temperature, salinity, and water level fluctuation during 24 hours in Bonggang Stream (a–c) and Miryong Stream (d–f). Dotted line, bold line, and thin line indicated outer point, inner point, and tide level, respectively. Data for tidal levels observed Nockdong Port (a–c), Cheollanam-do and Nampo Port (d–f), Kyeong-sangnam-do, respectively
표 Table 1. The number of species (N) and mean abundance (A, x103 cells cm-2) of epilithic algae from monthly sampling sites in Bonggang Stream and Miryong Stream
그림 Fig. 4. Monthly variations in epilithic algae abundance and chlorophyll-a of Bonggang Stream (a) and Miryong Stream (b)
표 Table 2. Relative abundance (%) of epilithic algal groups in Bonggang Stream and Miryong Stream (BA: Bacillariophyceae, CY: Cyanophyceae, CH: Chlorophyceae)
그림 Fig. 6. Density (inds. m_-2), shell width (mm), and total weight (g) of Clithon retropictum at the sampling sites (△: St.1, □: St. 2, ◇: St. 3, ○: St. 4) in Bonggang Stream (a–c) and Miryong Stream (d–f)
그림 Fig. 5. Relative abundance (%) of epilithic algae groups in Bonggang Stream (b1–b4) and Miryong Stream (m1–m4) between 2018 and 2020. The family is listed algae group in species over 1% of total abundance Fig.
그림 Fig. 7. Relationships between shell width and shell height of Clithon retropictum (a: Bonggang Stream (n = 1,806), b: Miryong Stream (n = 1,225))
그림 Fig. 8. Relationships between shell width and total weight of Clithon retropictum (a: Bonggang Stream (n =1,806), b: Miryong Stream (n = 1,225))
표 Table 3. Shell width, shell height, and total weight of Clithon retropictum at sampling sites in Bonggang Stream and Miryong Stream
그림 Fig. 9. Size (shell width) frequency distribution of Clithon retropictum in Bonggang Stream (a) and Miryong Stream (b)
표 Table 4. Correlation coefficients between environmental factors and biotic measurements on Clithon retropictum collected in Bonggang Stream
표 Table 5. Correlation analysis between environmental factors and biotic measurements on Clithon retropictum collected in Miryong Stream

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