scholarly journals Macro-algae flora and succession characteristics in the mussel culture zones in Gouqi island, Zhejiang Province

2017 ◽  
Author(s):  
Yan Huang ◽  
Bin Sun ◽  
Pei Min He
Keyword(s):  
Diversity Index ◽  
Zhejiang Province ◽  
Human Disturbances ◽  
Grateloupia Turuturu ◽  
Algal Communities ◽  
Algae Biomass ◽  
Factors Affecting ◽  
Water Currents ◽  
Mussel Culture ◽  
Macro Algae

Macro-algae flora of the mussel culture zones in Gouqi island, Zhejiang Province, was surveyed from 2014 to 2015. Seventy species of macro-algae were identified, belonging to 31 genera, 21 families, 14 orders, and three phyla. Thirty-eight species from 16 genera belong to Rhodophyta, 21 species from seven genera belong to Phaeophyta, and 11 species from eight genera belong to Chlorophyta. Rhodophyta, Chlorophyta, and Phaeophyta contributed to 54.29%, 30%, and 15.71% of the total number of species, respectively. The dominant species were Undaria pinnatifida, Sargassum horneri, Grateloupia livida, Grateloupia turuturu, Ulva pertusa, Ulva lactuca, Hypnea boergesenii, Ulva linza, Cladophora utriculosa, and Amphiroa ephedraea. Seasonal alternation of macro-algae species was evident; there were 52 species in spring, 42 species in winter, 38 species in autumn, and 30 species in summer. Macro-algae biomass was highest in spring and lower in autumn > summer > and winter. The diversity of macro-algae communities also changed seasonally; the diversity index (H’) was highest in autumn and lower in summer > winter > and spring. The results of de-trended correspondence analysis suggested that temperature was the most important environmental factor affecting the distribution of the macro-algae in mussel culture zones. Wind, water currents, and human disturbances were also important factors affecting algal communities.

scholarly journals Macro-algae flora and succession characteristics in the mussel culture zones in Gouqi island, Zhejiang Province

2017 ◽  
Author(s):  
Yan Huang ◽  
Bin Sun ◽  
Pei Min He
Keyword(s):  
Diversity Index ◽  
Zhejiang Province ◽  
Human Disturbances ◽  
Grateloupia Turuturu ◽  
Algal Communities ◽  
Algae Biomass ◽  
Factors Affecting ◽  
Water Currents ◽  
Mussel Culture ◽  
Macro Algae

Macro-algae flora of the mussel culture zones in Gouqi island, Zhejiang Province, was surveyed from 2014 to 2015. Seventy species of macro-algae were identified, belonging to 31 genera, 21 families, 14 orders, and three phyla. Thirty-eight species from 16 genera belong to Rhodophyta, 21 species from seven genera belong to Phaeophyta, and 11 species from eight genera belong to Chlorophyta. Rhodophyta, Chlorophyta, and Phaeophyta contributed to 54.29%, 30%, and 15.71% of the total number of species, respectively. The dominant species were Undaria pinnatifida, Sargassum horneri, Grateloupia livida, Grateloupia turuturu, Ulva pertusa, Ulva lactuca, Hypnea boergesenii, Ulva linza, Cladophora utriculosa, and Amphiroa ephedraea. Seasonal alternation of macro-algae species was evident; there were 52 species in spring, 42 species in winter, 38 species in autumn, and 30 species in summer. Macro-algae biomass was highest in spring and lower in autumn > summer > and winter. The diversity of macro-algae communities also changed seasonally; the diversity index (H’) was highest in autumn and lower in summer > winter > and spring. The results of de-trended correspondence analysis suggested that temperature was the most important environmental factor affecting the distribution of the macro-algae in mussel culture zones. Wind, water currents, and human disturbances were also important factors affecting algal communities.

STRUKTUR KOMUNITAS MAKRO ALGA DI PESISIR PULAU KECAMATAN BULANG

SIMBIOSA ◽  
2014 ◽  
Vol 3 (2) ◽  
Author(s):  
Notowinarto Notowinarto ◽  
Ramses Ramses ◽  
Mulhairi Mulhairi
Keyword(s):  
Community Structure ◽  
Diversity Index ◽  
Algal Species ◽  
Algal Communities ◽  
Marine Life ◽  
Ph Values ◽  
Abundance Patterns ◽  
Coastal Marine ◽  
Temperature Parameter ◽  
Important Value Index

Bulang districts Batam Islands of  Riau province (Riau Islands), its consists of many islands with as well as having the potential diversity of coastal marine life in particular kinds of macro algae or seaweed. Conducted research aimed to determine the structure of macro- algal communities in the intertidal zone islands. The results of the identification of algal species found 16 species are: the Order of Chlorophyceae as 6 spesies; Order Phaeophyceae as 2 spesies; and Order Rhodophyceae as 8 spesies. The community structure at the five stations showed the highest values were found in the island of dominance Cicir (D ' = 0.79) , uniformity index values on Tengah Island (E ' = 0.99) , while the island Balak had the highest diversity index (H ' = 0.88) , with the abundance patterns of population structure on the island is pretty good Central . Results of correlation analysis of regression between IVI types of algae with the conditions of environmental quality suggests that there is a significance (Fhit ˃ F table and the value of r = > 90 %) between IVI algae Halimeda sp and Cryptarachne polyglandulosa at each station with a temperature parameter surface (⁰C) , depth temperature (⁰C) and pH values. Keywords : Algae, Community Structure, Important Value Index.

scholarly journals Epilithic community development on artificial reefs deployed along a cross-shelf environmental gradient off Paraná state, southern Brazil

2011 ◽  
Vol 59 (spe1) ◽  
pp. 43-53 ◽  
Author(s):  
Frederico Brandini ◽  
Ariel Scheffer da Silva
Keyword(s):  
Large Scale ◽  
Diversity Index ◽  
Artificial Reef ◽  
Larval Abundance ◽  
Percent Cover ◽  
Southern Brazil ◽  
Factors Affecting ◽  
Hydrographic Conditions ◽  
One Year ◽  
General Community

Concrete modules were deployed on the bottom of the 11, 18 and 30 meters isobaths along a cross-shelf hydrographic gradient off Paraná State, Southern Brazil, with the purpose of studying the colonization of sessile epilithic macroinvertebrates on artificial surfaces. After one year of submersion a total of 63 species of epilithic organisms were identified, dominated by Ostrea puelchana, Chthamalus bisinuatus, Balanus cf spongicola, Astrangia cf rathbuni, Didemnum spp, poryphers and bryozoans. Diversity index and percent cover at reef stations placed at 11, 18 and 30 meters isobaths were respectively 2.28 and 66.7%, 2.79 and 96.6% and 1.66 and 77.4%. Differences of general community structure among the three assemblages were not clearly related to the general environmental conditions at the bottom layers near the reef stations. Turbidity and larval abundance are discussed as important factors affecting colonization processes. Results indicate that depths between 15-20 meters are more suitable for the implementation of large scale artificial reef systems in the inner shelf off Paraná and, possibly, throughout the inner shelves off southern Brazil with similar hydrographic conditions.

Production of hydrogen from marine macro-algae biomass using anaerobic sewage sludge microflora

2009 ◽  
Vol 14 (3) ◽  
pp. 307-315 ◽  
Author(s):  
Jae-Il Park ◽  
Jinwon Lee ◽  
Sang Jun Sim ◽  
Jae-Hwa Lee
Keyword(s):  
Sewage Sludge ◽  
Algae Biomass ◽  
Production Of Hydrogen ◽  
Macro Algae

scholarly journals Comparative Study on Phytoplankton Community in Two Newly Dug Ponds in Institut Teknologi Sumatera

2020 ◽  
Vol 5 (1) ◽  
pp. 63-69
Author(s):  
Hendry Wijayanti ◽  
Andy Darmawan
Keyword(s):  
Phytoplankton Community ◽  
Diversity Index ◽  
Species Abundance ◽  
Mean Value ◽  
Linear Mixed Effect Model ◽  
Reservoir Water ◽  
Mixed Effect ◽  
Algae Biomass ◽  
Phytoplankton Diversity ◽  
Wiener Diversity Index

Phytoplankton community plays an important ecological role in the aquatic ecosystems as the primary producers and forms the fundament of the aquatic food chain for supporting the water community. Thus, the phytoplankton community structure is a good indicator of water quality due to its sensitiveness to environmental stresses. Two newly dug ponds in Institut Teknologi Sumatera may give an opportunity to study the early colonizing stages of various freshwater communities including phytoplankton. The study attempted to determine the composition and abundance of phytoplankton. Samples were collected from two ponds (A and C) in the reservoir water of Institut Teknologi Sumatera. The content of Phosphorus (P), Nitrogen (N), and Chlorophyll-a (algae biomass) were determined. Phytoplankton had higher diversity in Pond C than Pond A in the study period, in which a total of seven taxa were found, namely Bacillariophycea, Cyanophyceae, Chlorophyceae, Conjugatophyceae, Dinophyceae, Euglenophyceae, Gymnodiniaceae. The most species abundance of both ponds was Peridinium sp. and Trachelomonas sp. The Pond C had the highest mean value of the Shannon-Wiener diversity index. The Linear mixed-effect model showed that low turbidity will result in high phytoplankton diversity. The finding of this study suggests that higher phytoplankton diversity would achieve a natural carrying capacity, and thus would serves as an indicator of ecosystem health.

scholarly journals Extent and financial cost of cassava postharvest loss along the cassava value chain in Kwara State, Nigeria

2019 ◽  
Vol 114 (2) ◽  
pp. 149
Author(s):  
Samuel Temitope DANILOLA ◽  
Raphael BABATUNDE ◽  
Jubril ANIMASHAUN
Keyword(s):  
Value Chain ◽  
Diversity Index ◽  
Economic Status ◽  
Analytical Techniques ◽  
Sampling Technique ◽  
Tobit Regression ◽  
Factors Affecting ◽  
Postharvest Loss ◽  
Financial Implication ◽  
Structured Questionnaire

<p>Cassava has been identified as Africa’s second most important staple food after maize, in terms of calories consumed, with Nigeria as the World leading producer. This study estimated postharvest loss of cassava along the cassava value chain in Kwara State. It estimated the size of postharvest loss of cassava; analysed the factors responsible and the financial implications of loss; and identified the strategies employed in the mitigation of loss in the study area. A three-stage random sampling technique was used to select 117 cassava farmers whom were administered structured questionnaire to elicit data analysed by the study. Descriptive statistics, Shannon’s diversity index and Tobit regression model were the analytical techniques utilised. The results show that 68 % of the loss occurred at the harvesting. The loss was estimated to be about 3.8 t ha<sup>-1</sup>. The financial implication was valued at $ 300 ha<sup>-1</sup>. Analysis of the factors responsible for cassava postharvest loss showed that the quantity expected at harvesting, household size and age of the farmer were significant factors affecting cassava postharvest loss. The result also revealed that farmers mitigate these losses by processing the roots and reburying unused roots into the soil. Steps needed to reduce loss have to take these factors into consideration to improve the economic status of cassava farmers-processors.</p>

scholarly journals Algae in sphagnum epiphyton from the mires of the Subpolar Urals

2017 ◽  
Vol 23 (1) ◽  
pp. 3-16
Author(s):  
Irina Sterlyagova ◽  
Julia Shabalina
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Sea Level ◽  
High Abundance ◽  
Algal Communities ◽  
Factors Affecting ◽  
Subpolar Urals ◽  
Main Factors

Abstract Species diversity of algal communities of sphagnum epiphyton was studied in six mountain and plain mires of the Subpolar Urals (Russia). A total of 154 species and intraspecific taxa from six divisions were identified. The highest species richness was recorded for Bacillariophyta (96 taxa) and Charophyta (33) divisions. Species Kobayasiella parasubtilissima, Tabellaria flocculosa and Eunotia lunaris had high abundance. Dominant communities were often formed by Eunotia lunaris, E. mucophila, Kobayasiella parasubtilissima and Pinnularia subcapitata. CCA analysis showed that conductivity and altitude above the sea level are the main factors affecting the development of algae in the studied mires.

Population density in Podarcis lilfordi (Squamata, Lacertidae), a lizard species endemic to small islets in the Balearic Islands (Spain)

2008 ◽  
Vol 29 (1) ◽  
pp. 49-60 ◽  
Author(s):  
Valentín Pérez-Mellado ◽  
Javier Martín-Vallejo ◽  
Richard Brown ◽  
Antonia Picornell ◽  
José Castro ◽  
...  
Keyword(s):  
Rattus Rattus ◽  
Habitat Diversity ◽  
Balearic Islands ◽  
Lizard Species ◽  
Human Disturbances ◽  
Factors Affecting ◽  
Island Area ◽  
Podarcis Lilfordi ◽  
Independent Variable ◽  
Insular Populations

Abstract The Balearic lizard, Podarcis lilfordi, is present in 43 insular populations in the Cabrera archipelago and around the coasts of Mallorca and Menorca islands (Spain). We studied lizard densities over the entire range of distribution, analyzing observed differences of density in relation to island area, habitat diversity, availability of resources, presence of predators, competitors and human disturbances. The density of the Balearic lizard varies from less than 35 to almost 8000 lizards ha–1, with an average of around 1500 lizards ha–1. In some very small islets we detected no more than 10 individuals. Using a subsample of nine coastal islets (Menorca) we did not find any significant correlation between ground arthropod biomass and lizard density. The combination of island area and its maximal altitude, its so-called biotic capacity, was also uncorrelated with lizard density. In addition, neither degree of island accessibility nor presence/absence of seagull breeding colonies, were able to explain lizard densities. Islands without ship rats (Rattus rattus) showed a significantly higher lizard density, but islands in which rat eradication programs were launched during the study period, showed lower densities than those with rats but no eradication actions. Genetic variability was significantly higher on bigger lizard populations, lacking a correlation with lizard densities. No single independent variable can explain density differences among populations under study. Our results are discussed in the light of available hypotheses on factors affecting population densities.

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