• 한국항해항만학회지
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• 제30권4호
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• pp.309-314
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• 2006

Community structure and biodiversity of benthic marine algae were studied in the rocky shore of Phohang New Port, Yeoungil Bay. A total of 79 species of marine algae including 8 Chlorophyta, 23 Phaeophyta and 48 Rhodophyta are listed. The dominant algal species were Corallina pilulifera in all seasons, and Sargassum homeri in winter. Lomentaria catenata, Lomentaria hakodatensis, Grateloupia laceolata, Sargassum thunbergii, Chondria crassicaulis, Ulva pertusa, and Hypnea charoides were subdominant at different seasons. The algal biomass per unit area of the benthic algal community in Pohang New Port under construction was 14506 - 398.93 g dry wt m-2, which means that its annually averaged value is 273.45 g dry wt m-2 . The seasonal change in algal biomass showed highs in winter and spring, and lows in summer and autumn. The algal species diversity (H') based on algal biomass was 2.07 annually in average, with 2.42 in winter, 2.65 in spring, 1.79 in summer and 1.43 in autumn. It was high in winter and spring seasons and low in summer and autumn seasons. It is caused by that spring and winter are the profitable growth time for algae and species components in this study were dominated by the annual or seasonal rather than perennial plants.

• Asian-Australasian Journal of Animal Sciences
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• 제31권1호
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• pp.54-62
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• 2018

Objective: Due to the threat of global warming, the livestock industry is increasingly interested in exploring how feed additives may reduce anthropogenic greenhouse gas emissions, especially from ruminants. This study investigated the effect of Rhodophyta supplemented bovine diets on in vitro rumen fermentation and rumen microbial diversity. Methods: Cannulated Holstein cows were used as rumen fluid donors. Rumen fluid:buffer (1:2; 15 mL) solution was incubated for up to 72 h in six treatments: a control (timothy hay only), along with substrates containing 5% extracts from five Rhodophyta species (Grateloupia lanceolata [Okamura] Kawaguchi, Hypnea japonica Tanaka, Pterocladia capillacea [Gmelin] Bornet, Chondria crassicaulis Harvey, or Gelidium amansii [Lam.] Lamouroux). Results: Compared with control, Rhodophyta extracts increased cumulative gas production after 24 and 72 h (p = 0.0297 and p = 0.0047). The extracts reduced methane emission at 12 and 24 h (p<0.05). In particular, real-time polymerase chain reaction analysis indicated that at 24 h, ciliate-associated methanogens, Ruminococcus albus and Ruminococcus flavefaciens decreased at 24 h (p = 0.0002, p<0.0001, and p<0.0001), while Fibrobacter succinogenes (F. succinogenes) increased (p = 0.0004). Additionally, Rhodophyta extracts improved acetate concentration at 12 and 24 h (p = 0.0766 and p = 0.0132), as well as acetate/propionate (A/P) ratio at 6 and 12 h (p = 0.0106 and p = 0.0278). Conclusion: Rhodophyta extracts are a viable additive that can improve ruminant growth performance (higher total gas production, lower A/P ratio) and methane abatement (less ciliateassociated methanogens, Ruminococcus albus and Ruminococcus flavefaciens and more F. succinogenes.

• 한국수산과학회지
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• 제25권5호
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• pp.392-398
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• 1992

본 연구는 홍조 16종에 대해서 경남 양산군 대송리의 자연개체군을 대상으로 사분포자체 및 과포자체의 출현시기를 파악하였다. 그 결과 G. furcata가 춘$\cdot$하계에 L. intermedia, L. undulata, R. intricata는 하계에, C. dasyphylla, H. charoides는 추계에, C. affinis, P lanceolata, C. ocellatus, A. polyneurum, G. flabelliformis, G. intermedia, C. parvula, C. Paniculatum는 하계와 추계에 사분포자 및 과포자를 형성하여 뚜렷한 계절성을 보였다. 조사대상 16종 중에서 G. flabelliformis, G. intermedia, R. intricate에서는 과포자상(carposporic phase)만 관찰되었고, P. telfairiae, H. charoides, C. parvula, C. Paniculatum에서는 사분포자상(tetrasporic phase)만이 관찰되었다. 이 중 G. flabelliformis는 고수온역인 고리 원자력 발전소취수구에서는 사분포자상만이, 또 C. paniculatum는 과포자상만이 형성되어 자연개체군의 생활사는 불안정하며, 또 수온에 의해 지역적으로 제한됨을 시사하였다. 또한 과포자상 및 사분포자상을 갖는 종 중에서 C. affinis는 과포자상이 우세한 종이며, G. furcata, C. ocellaltus, C. dasyphylla, S. latiuscula는 사분포자상이 우세하였다. 또 C. affinis, C. ocellatus, A. polyneurum, C. dasyphylla, L. intermedia, L. undulata에서는 과포자상의 출현후 1개월 이내에 사분포자상이 출현하는 것으로 나타났다. 생식세포의 형성시기와 생체량의 변동은 생식세포를 형성하는 시점에서 생체량이 극대화되고, 생식세포를 방출하면서 생체량이 점차 감소하는 것으로 나타났다.