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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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Post-disturbance Recovery Pattern in the Soft Corals-Macroalgae Mixed Habitat in Jeju Island, Korea
김준수,홍석우,양권모,Macias Daniela,김정하 (사)한국해양생명과학회 2021 한국해양생명과학회지 Vol.6 No.2
Post-disturbance recovery pattern of subtidal soft corals-macroalgae mixed community and the role of water depth were investigated. The experiment was conducted in a subtidal rock wall of Munseom, Jeju Island, Korea for 2.5 years. Artificial disturbance was done at established treatment plots at depths of 10, 15 and 20 m and were then compared with undisturbed control plots. After disturbance, recovery of soft corals was very slow, whereas macroalgae quickly occupied the plots and reached a similar level as the control in 6 months, and this pattern was consistent at all water depths. This unbalanced speed of recovery caused higher macroalgae establishment than soft corals in treatment compared to control plots, indicating a possible phase shift in the community structure. This study provides an important implication for the necessity of monitoring the influence of disturbance at a larger scale, from a conservation perspective of soft corals in Jeju coast.
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Changes in macroalgal assemblage with sea urchin density on the east coast of South Korea
Byung Hee Jeon,양권모,김정하 한국조류학회I 2015 ALGAE Vol.30 No.2
Urchin barrens have been a major issue of rocky coastal ecosystems in temperate regions. In South Korea, the east coast and Jeju Island have especially been a focus because the area of barren ground increases in spite of continual efforts to install artificial reefs. This study approached the urchin barrens issue in South Korea, by focusing on a correlational analysis of urchin and macroalgal abundance. Urchin density and algal species coverage were obtained using a quadrat image analysis. Subtidal sites were then classified into three groups according to the average densities of urchins to evaluate the characterization of the macroalgal community: no urchin (NU) zone; transition (TR) zone, 4 inds. m-2; and urchin (UR) zone, ≥8 inds. m-2. The average urchin density in the study site was 4.7 inds. m-2 and 57 macroalgal species were found in the study site. From the NU zone to UR zone, total species number, species diversity index and evenness gradually decreased, whereas the dominance index increased. The algae species with negative correlations were Grateloupia divaricata, Polysiphonia morrowii, Chondracanthus intermedius, Delesseria violacea, Desmarestia viridis; and those with positive correlations were the crustose corallines, Sargassum horneri. Other species were not significantly correlated with urchin density. The significant correlations indicate that the abundance of some macroalgal species is proportionally regulated by sea urchin density. This study also shows how macroalgal vegetation changes in response to an urchin’s density gradient in a natural condition; and there is a TR zone that existed with respect to an intermediate level of algal abundance.
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