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한국연안 해조류 생물량의 연간 변동 양상: 제주도 문섬지역
고영욱,성건희,이창호,김현희,최동문,고용덕,이욱재,고형범,옥정현,정익교,김정하,Ko, Young-Wook,Sung, Gun-Hee,Yi, Chang-Ho,Kim, Hyun-Hee,Choi, Dong-Mun,Ko, Yong-Deok,Lee, Wook-Jae,Koh, Hyoung-Bum,Oak, Jung-Hyun,Chung, Ik-Kyo,Kim, Jeong-H 한국조류학회(藻類) 2008 ALGAE Vol.23 No.4
Seaweed biomass was estimated using a nondestructive method in the rocky subtidal zones in Munseom, Jeju Island, Korea from July 2006 to April 2008. Seasonal samplings were done at the depth of 1, 5, 10 m using 50 x 50 cm quadrat. Mean biomass was comprised of 2,784 g wet wt m$^{-2}$ and the biomass values varied seasonally from 1,176 g wet wt m$^{-2}$ to 4,217 g wet wt m$^{-2}$ with the highest point in April. Biomass reached maximum at 5 m depth in spring, but was shifted to 10 m depth in summer. Common seaweeds appeared year round in Munseom were Codium minus, Ecklonia cava, Sargassum spp., articulated corallines and Plocamium telfairiae. Among them, E. cava showed the highest biomass (average of 1,288 g wet wt m$^{-2}$), comprising 4% of total biomass. Only 12 species’' biomass covered 98% of total value, which indicated the contribution of few common species to algal community. Seaweed biomass in Munseom represented one of the highest values in coastal regions in Korea.
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고영욱,성건희,김정하,Ko, Young-Wook,Sung, Gun-Hee,Kim, Jeong-Ha 한국조류학회(藻類) 2008 ALGAE Vol.23 No.4
To estimate seaweed biomass or standing crop, a nondestructive sampling can be beneficial because of not much destroying living plants and saving time in field works. We suggest a methodological procedure to estimate seaweed biomass per unit area in marine benthic habitats by using species-specific regression equations. Percent cover data are required from the field samplings for most species to convert them to weight data. However, for tall macroalgae such as kelps we need density data and their size (e.g., size class for subtidal kelps) of individuals. We propose that the field sampling should be done with 5 replicates of 50 cm x 50 cm quadrat at three zones of intertidals (upper, middle, lower) and three depth points (1, 5, 10 m) in subtidals. To obtain a reliable regression equation for a species, a substantial number of replicate is necessary from destructive samplings. The regression equation of a species can be further specified by different locality and different season, especially for the species with variable morphology temporally and spatially. Example estimation carried out in Onpyung, Jeju Island, Korea is provided to compare estimated values with real weight data.
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Effects of disturbance timing on community recovery in an intertidal habitat of a Korean rocky shore
김현희,고영욱,양권모,성건희,김정하 한국조류학회I 2017 ALGAE Vol.32 No.4
Intertidal community recovery and resilience were investigated with quantitative and qualitative perspectives as afunction of disturbance timing. The study was conducted in a lower intertidal rock bed of the southern coast of SouthKorea. Six replicates of artificial disturbance of a 50 cm × 50 cm area were made by clearing all visible organisms on therocky substrate in four seasons. Each of the seasonally cleared plots was monitored until the percent cover data reachedthe control plot level. There was a significant difference among disturbance timing during the recovery process in termsof speed and community components. After disturbances occurred, Ulva pertusa selectively preoccupied empty spacesquickly (in 2-4 months) and strongly (50-90%) in all plots except for the summer plots where non-Ulva species dominatedthroughout the recovery period. U. pertusa acted as a very important biological variable that determined the quantitativeand qualitative recovery capability of a community. The qualitative recovery of communities was rapid in summer plotswhere U. pertusa did not recruit and the community recovery rate was the lowest in winter plots where U. pertusa washighly recruited with a long duration of distribution. In this study, U. pertusa was a pioneer species while being a dominantspecies and acted as a clearly negative element in the process of qualitative recovery after disturbance. However, thenegative effect of U. pertusa did not occur in summer plots, indicating that disturbance timing should be considered as aparameter in understanding intertidal community resilience in temperate regions with four distinct seasons.
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