Macrozoobenthos community structure and water quality bioassess-ment in the mid-reaches of the Heilongjiang River

Anthropogenic disturbances in the Chesapeake Bay (USA) have depleted eastern oyster Crassostrea virginica abundance and altered the estuary’s environment and water quality. Efforts to rehabilitate oyster populations are underway; however, the effect of oyster biodeposits on water quality and plankton community structure are not clear. In July 2017, we used 6 shear turbulence resuspension mesocosms (STURMs) to determine differences in plankton composition with and without the daily addition of oyster biodeposits to a muddy sediment bottom. STURM systems had a volume-weighted root mean square turbulent velocity of 1.08 cm s-1, energy dissipation rate of ~0.08 cm2 s-3, and bottom shear stress of ~0.36-0.51 Pa during mixing-on periods during 4 wk of tidal resuspension. Phytoplankton increased their chlorophyll a content in their cells in response to low light in tanks with biodeposits. The diatom Skeletonema costatum bloomed and had significantly longer chains in tanks without biodeposits. These tanks also had significantly lower concentrations of total suspended solids, zooplankton carbon, and nitrite +nitrate, and higher phytoplankton carbon concentrations. Results suggest that the absence of biodeposit resuspension initiates nitrogen uptake for diatom reproduction, increasing the cell densities of S. costatum. The low abundance of the zooplankton population in non-biodeposit tanks suggests an inability of zooplankton to graze on S. costatum and negative effects of S. costatum on zooplankton. A high abundance of the copepod Acartia tonsa in biodeposit tanks may have reduced S. costatum chain length. Oyster biodeposit addition and resuspension efficiently transferred phytoplankton carbon to zooplankton carbon, thus supporting the food web in the estuary.

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Plankton community structure and its relation to the water quality in streams under urban impacts

SIL Proceedings 1922-2010 ◽

10.1080/03680770.1995.11900926 ◽

1998 ◽

Vol 26 (3) ◽

pp. 1266-1270

Author(s):

M. J. Santos ◽

O. Rocha

Keyword(s):

Water Quality ◽

Community Structure ◽

Plankton Community ◽

Urban Impacts ◽

Plankton Community Structure

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The Relationship between the Community Structure and Function of Bacterioplankton and the Environmental Response in Qingcaosha Reservoir

Water ◽

10.3390/w13223155 ◽

2021 ◽

Vol 13 (22) ◽

pp. 3155

Author(s):

Shumin Liu ◽

Fengbin Zhao ◽

Xin Fang

Keyword(s):

Water Quality ◽

Community Structure ◽

High Throughput Sequencing ◽

Scientific Basis ◽

Vital Role ◽

Structure And Function ◽

Environmental Response ◽

Temporal And Spatial ◽

Density And Biomass ◽

And Function

Phytoplankton and bacterioplankton play a vital role in the structure and function of aquatic ecosystems, and their activity is closely linked to water eutrophication. However, few researchers have considered the temporal and spatial succession of phytoplankton and bacterioplankton, and their responses to environmental factors. The temporal and spatial succession of bacterioplankton and their ecological interaction with phytoplankton and water quality were analyzed using 16S rDNA high-throughput sequencing for their identification, and the functions of bacterioplankton were predicted. The results showed that the dominant classes of bacterioplankton in the Qingcaosha Reservoir were Gammaproteobacteria, Alphaproteobacteria, Actinomycetes, Acidimicrobiia, and Cyanobacteria. In addition, the Shannon diversity indexes were compared, and the results showed significant temporal differences based on monthly averaged value, although no significant spatial difference. The community structure was found to be mainly influenced by phytoplankton density and biomass, dissolved oxygen, and electrical conductivity. The presence of Pseudomonas and Legionella was positively correlated with that of Pseudanabaena sp., and Sphingomonas and Paragonimus with Melosira granulata. On the contrary, the presence of Planctomycetes was negatively correlated with Melosira granulata, as was Deinococcus-Thermus with Cyclotella sp. The relative abundance of denitrifying bacteria decreased from April to December, while the abundance of nitrogen-fixing bacteria increased. This study provides a scientific basis for understanding the ecological interactions between bacteria, algae, and water quality in reservoir ecosystems.

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Macroinvertebrate community structure and water quality variation in an effluent impacted wetlands (Lake Coleman), Victoria, Australia

Wetlands Australia ◽

10.31646/wa.182 ◽

2010 ◽

Vol 17 (1) ◽

pp. 1

Author(s):

David Haynes ◽

Kerrie Lee ◽

Louisa Oswald

Keyword(s):

Water Quality ◽

Community Structure ◽

Macroinvertebrate Community ◽

Water Quality Variation ◽

Quality Variation

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STRUKTUR KOMUNITAS ZOOPLANKTON DI PERAIRAN KABUPATEN LOMBOK UTARA, PROVINSI NUSA TENGGARA BARAT

JURNAL BIOLOGI TROPIS ◽

10.29303/jbt.v18i2.800 ◽

2018 ◽

Vol 18 (2) ◽

Author(s):

Muhammad Junaidi ◽

Nurliah Nurliah ◽

Fariq Azhar

Keyword(s):

Water Quality ◽

Community Structure ◽

Aquatic Ecosystems ◽

Zooplankton Community ◽

Geographical Information ◽

Zooplankton Community Structure ◽

Ecological Index ◽

Physical Chemical ◽

Chemical Conditions

ABSTRAKMengingat peranan zooplankton dalam ekosistem perairan sangat penting, maka dilakukan penelitian dengan tujuan untuk menganalisis struktur komunitas zooplankton yang meliputi jenis, kelimpahan, dan indek ekologi, dan kaitan distribusi zooplankton dan kualitas perairan di Perairan Kabupaten Lombok Utara. Pengumpulan data dirancang dengan sistem informasi geografis (SIG) pada 23 stasiun pengamatan yang ditentukan dengan teknik acak sederhana. Hasil penelitian menunjukkan bahwa jenis dan kelimpahan zooplankton yang ditemukan di Perairan Kabupaten Lombok Utara cukup bervariasi dengan jumlah genus sebanyak 9 yang terbagi dari 5 kelas. Berdasarkan perhitungan indeks ekologi menunjukkan bahwa struktur komunitas zooplankton dalam kategori perairan yang kurang stabil. Kelimpahan dan indeks ekologi zooplankton dipengaruhi oleh kondisi lingkungan (fisik-kimia) perairan antara lain kecerahan, pH dan oksigen terlarut. Kata kunci : zooplankton, struktur komunitas, kualitas perairan, kelimpahanABSTRACTConsidering that the role of zooplankton in aquatic ecosystems is very important, research is carried out with the aim of analyzing zooplankton community structure which includes the type, abundance, and ecological index, and the relation of zooplankton distribution and water quality in North Lombok Regency Waters. Data collection was designed with a geographical information system (GIS) on 23 observation stations that were determined by simple random techniques. he results of this study indicate that the type and abundance of zooplankton found in the waters of North Lombok Regency are quite varied with the number of genus as many as 9 which are divided into 5 classes. Based on the calculation of the ecological index shows that the zooplankton community structure is in the category of less stable waters. The abundance and ecological index of zooplankton is influenced by the environmental (physical-chemical) conditions of the waters including brightness, pH and dissolved oxygen. Keywords: zooplankton, community structure, water quality, abundance

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