Coastal urbanization leads to remarkable seaweed species loss and community shifts along the SW Atlantic

We examined seasonal variation in the structure of marine macroalgal communities at five sites around the Byeonsan Peninsula, Korea, from January to October 2011. Sixty eight species were identified, including 11 green, 17 brown and 40 red algae. Species richness was highest at Gyeokpo (51 species) followed by Sambal (47), Gosapo (34), Byeonsan (33), and Habgoo (18). Seaweed biomass ranged from 12.98 to 145.33 g dry wt/m 2 , with maximum and minimum biomasses at Gyeokpo and Habgoo, respectively. Sargassum thunbergii was the representative alga species occupying 47.89% of the total biomass. The dominant seaweeds were S. thunbergii, Corallina pilulifera, Ulva spp, Gracilaria vermiculophylla, and Carpopeltis affinis. No distinctive vertical distribution of seaweeds was found because S. thunbergii, Ulva spp, and G. vermiculophylla were all distributed from high to low shore. Community indices were as follows: dominance index (DI), 0.44-0.61; richness index (R), 6.27-10.35; evenness index (J'), 0.38-0.59; and diversity index (H'), 1.48-1.71. Gyeokpo had the most biomass and highest species richness, and the lowest percentage of Ulva species. However, species richness declined at Gyeokpo, from 78 to 51 species within 10 years, implying that eutrophication and sedimentation from Mankyeong and Dongjin rivers have reduced the stability of seaweed communities.

“…(biofilter) , (biological indicator) (Worm et al, 2000;Wells et al, 2007;Scherner et al, 2013). , , ,…”

Section: %mentioning

confidence: 99%

Seasonal Variation in Macroalgal Community Structure around the Byeonsan Peninsula, Korea

Han¹,

Lee²,

Jeon³

et al. 2014

“…, (indicator organism) (bio-indicator) (Abbott and North, 1971;Orfanidis et al, 2001;Wells et al, 2007;Yoo et al, 2007;Scherner et al, 2013). , , ,…”

mentioning

confidence: 99%

Species Composition and Vertical Distribution of Marine Algal Communities at the Taean Peninsula of the West Coast of Korea

Ahn¹,

Yoo²,

Oh³

et al. 2017

Seasonal variability in algal community structure was examined at the intertidal zones of five study sites on the Taean Peninsula, on the western coast of Korea, from February 2014 to November 2015. A total of 118 species of marine algae, comprising 17 green, 24 brown and 77 red algae, were identified. The maximum number of species was observed at the Mohang site (75 species), and the minimum at the Yeonpo site (46 species). The seaweed biomass was 160.24 g dry wt./m 2 on average, and was maximal at Uihang (519.04 g dry wt./m 2 ) and minimal at Yeonpo (19.03 g dry wt./m 2 ). Based on biomass, the dominant seaweeds at Taean peninsula were Sargassum thunbergii and Corallina pilulifera. Community indices were as follows: richness index (R), 3.21-5.01; evenness index (J'), 0.33-0.38; and diversity index (H'), 0.90-1.12. Based on evaluation of the environmental states by the community indices, the ecological evaluation index (EEI) of Taean peninsula was "moderate". The overall species and biomass of seaweeds decreased after the oil spill. However, Hakampo previously showed a similar algal community structure. In conclusion, the algal community was temporarily affected by the oil spill, but rapidly recovered.

“…(Wan et al, 2009;Ja niak and Whitlatch, 2012;Satheesh and Wesley, 2012). , (bio filter) , (biological indicator) (Worm et al, 2000;Wells et al, 2007;Scherner et al, 2013). (turf-forming) (phase shift) (Kraufvelin et al, 2010), , ( ) , (Whitaker et al, 2010), (Arévalo et al, 2007;Pinedo et al, 2007;Wells et al, 2007).…”

mentioning

confidence: 99%

Seasonal Variations in the Macroalgal Flora and Community Structure in Hallyeohaesang National Park on the South Coast of Korea

Oh¹,

Ahn²,

Kim³

et al. 2015

Seasonal variability in the marine seaweed community structure was examined in the intertidal zones at nine study sites in Hallyeohaesang National Park, on the southern coast of Korea from March to October 2014. A total of 145 seaweeds were indentified, comprising 15 green, 41 brown and 89 red algae. Coarsely branched seaweeds were the dominant functional group, comprising 58.95% in species number, whereas filamentous, sheet, thick leathery, crustose and jointed calcareous forms comprised 2.63-17.72% each. The seaweed biomass averaged 358.00 g dry wt/ m 2 and it was maximal at Somaemuldo (847.64 g dry wt/m 2 ) and minimal at Gamam (56.51 g dry wt/m 2 ). Based on biomass, the dominant and subdominant seaweeds were Ulva australis at Gamam, Sargassum thunbergii at Sangju, Ulva australis and S.fulvellum at Neukdo, S.horneri at Dala-Bijindo-Somaemuldo, S. thunbergii at Dapo, and Corallina pilulifera at Songdo. Community indices were as follows: dominance index (DI), 0.43-0.71; richness index (R), 8.26-16.50; evenness index (J'), 0.36-0.54; and diversity index (H'), 1.57-2.19. In conclusion, we found that both biomass and the community structure of seaweeds in Hallyeohaesang National Park were similar to those in other studies of the Southern Sea along the Korean peninsula, and that Hallyeohaesang National Park is a relatively favorable habitat for seaweeds. Future studies should examine the changes in seaweed composition and biomass as they relate to climate change and environmental pollution.Key words: Biomass, Community structure, Seaweed, Hallyeohaesang National Park This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial Licens (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.