scholarly journals Effects of Artificial Reefs on Phytoplankton Community Structure in Baiyangdian Lake, China

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1802
Author(s):  
Hao Zhu ◽  
Xingguo Liu ◽  
Shuiping Cheng ◽  
Jie Wang
Keyword(s):  
Community Structure ◽  
Phytoplankton Community ◽  
Artificial Reef ◽  
Artificial Reefs ◽  
Biomass Composition ◽  
Benthic Fish ◽  
Phytoplankton Community Structure ◽  
Freshwater Lakes ◽  
Surrounding Water ◽  
Significant Enrichment

The habitat and feeding environment of freshwater fish in freshwater lakes have been destroyed, with the problem of miniaturization and simplification of catches being serious. An artificial reef is an effective technical measure to protect and proliferate offshore fishery resources, but little research has been conducted on its application in freshwater lakes. A small artificial reef for freshwater lakes was designed according to the water depth of the lake and the habits of benthic fish. The artificial reef is composed of biomass modules, each of which is 900 × 120 mm. The community structure of phytoplankton around the artificial reef and its adjacent waters was studied. The results showed that 77 species from seven phyla were identified, with a high number of species from the Chlorophyceae. In terms of density composition, the density of cyanobacteria decreased month by month, while the phylum Chlorophyta and Cryptophyta increased first and then decreased. As for biomass composition, Chlorophyta and Cryptophyta increased first and then decreased. RDA analysis showed that water temperature, dissolved oxygen, and total phosphorus were the main influencing factors. To sum up, the artificial reef can improve the algae phase in the surrounding water column, inhibit the growth and reproduction of cyanobacteria to a certain extent, and have a significant enrichment and promotion effect on diatoms. Artificial fish reef affects the phytoplankton community structure of the surrounding water bodies mainly through the absorption of phosphorus nutrients. Artificial reefs can be popularized and applied in freshwater lakes to provide foraging and shelter for benthic fish in the lake.

Community Structure and Environmental Adaptation of Phytoplankton in Yangmeikeng Artificial Reef Area in Daya Bay, South China Sea

2013 ◽  
Vol 807-809 ◽  
pp. 52-60
Author(s):  
Xiu Li Liao ◽  
Pi Mao Chen ◽  
Sheng Wei Ma ◽  
Hai Gang Chen
Keyword(s):  
Community Structure ◽  
Primary Productivity ◽  
Phytoplankton Community ◽  
Artificial Reef ◽  
Community Diversity ◽  
Daya Bay ◽  
Diatom Species ◽  
Phytoplankton Community Structure ◽  
Phytoplankton Abundance ◽  
Reef Area

Seasonal species composition, abundance variations of phytoplankton were investigated during six cruises conducted in Yangmeikeng artificial reef area in Daya Bay, between April 1997 and May 1999. The results showed that there were 181 species of phytoplankton were identified and most belong to diatom species. The seasonal change of species and dominant species were obvious. Phytoplankton abundance was on the trend of rising with diatom dominated which showed that the artificial reef putted in this area played a role in promoting the primary productivity. TheK-dominance curve suggested that the community diversity of the phytoplankton decreased from May 2008, August 2008, April 2007, May 2009, March 2008 to November 2008, and the range of seasonal variations were obvious, which showed that the phytoplankton community structure was unstable. The canonical correspondence analysis (CCA) showed that the abundance and spatial distribution of phytoplankton were affected greatly by the water temperature, salinity, transparency, suspended matter and dissolved oxygen.

Seasonal changes in phytoplankton community structure in a bioluminescent lagoon, St. Croix, US Virgin Islands

2018 ◽  
Vol 81 (2) ◽  
pp. 109-124 ◽  
Author(s):  
JL Pinckney ◽  
C Tomas ◽  
DI Greenfield ◽  
K Reale-Munroe ◽  
B Castillo ◽  
...  
Keyword(s):  
Community Structure ◽  
Seasonal Changes ◽  
Phytoplankton Community ◽  
Virgin Islands ◽  
Phytoplankton Community Structure ◽  
Us Virgin Islands

scholarly journals Response of ocean phytoplankton community structure to climate change over the 21st century: partitioning the effects of nutrients, temperature and light

2010 ◽  
Vol 7 (12) ◽  
pp. 3941-3959 ◽  
Author(s):  
I. Marinov ◽  
S. C. Doney ◽  
I. D. Lima
Keyword(s):  
Climate Change ◽  
Community Structure ◽  
Sea Ice ◽  
Phytoplankton Biomass ◽  
Phytoplankton Community ◽  
Vertical Mixing ◽  
Phytoplankton Community Structure ◽  
Marginal Sea ◽  
Small Phytoplankton ◽  
The Impact

Abstract. The response of ocean phytoplankton community structure to climate change depends, among other factors, upon species competition for nutrients and light, as well as the increase in surface ocean temperature. We propose an analytical framework linking changes in nutrients, temperature and light with changes in phytoplankton growth rates, and we assess our theoretical considerations against model projections (1980–2100) from a global Earth System model. Our proposed "critical nutrient hypothesis" stipulates the existence of a critical nutrient threshold below (above) which a nutrient change will affect small phytoplankton biomass more (less) than diatom biomass, i.e. the phytoplankton with lower half-saturation coefficient K are influenced more strongly in low nutrient environments. This nutrient threshold broadly corresponds to 45° S and 45° N, poleward of which high vertical mixing and inefficient biology maintain higher surface nutrient concentrations and equatorward of which reduced vertical mixing and more efficient biology maintain lower surface nutrients. In the 45° S–45° N low nutrient region, decreases in limiting nutrients – associated with increased stratification under climate change – are predicted analytically to decrease more strongly the specific growth of small phytoplankton than the growth of diatoms. In high latitudes, the impact of nutrient decrease on phytoplankton biomass is more significant for diatoms than small phytoplankton, and contributes to diatom declines in the northern marginal sea ice and subpolar biomes. In the context of our model, climate driven increases in surface temperature and changes in light are predicted to have a stronger impact on small phytoplankton than on diatom biomass in all ocean domains. Our analytical predictions explain reasonably well the shifts in community structure under a modeled climate-warming scenario. Climate driven changes in nutrients, temperature and light have regionally varying and sometimes counterbalancing impacts on phytoplankton biomass and structure, with nutrients and temperature dominant in the 45° S–45° N band and light-temperature effects dominant in the marginal sea-ice and subpolar regions. As predicted, decreases in nutrients inside the 45° S–45° N "critical nutrient" band result in diatom biomass decreasing more than small phytoplankton biomass. Further stratification from global warming could result in geographical shifts in the "critical nutrient" threshold and additional changes in ecology.

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