Zooplankton community structure in relation to microcystins in the eutrophic Lake Zumpango (State of Mexico)

We studied the seasonal variation of rotifers, cladocerans and copepods in Lake Zumpango, Mexico City, from June 2010 to May 2011. Physical and chemical variables of the water were measured at three sites, while 50 L of water was filtered from these sites to study the zooplankton abundance, diversity and biomass. The water temperature ranged from 14 to 23 °C, and nitrate and phosphate concentrations from 0.2 to 1 and 4 to 14 mg L–1, respectively. Microcystis sp. Dolichospermum sp. and Planktothrix sp. were present throughout the year. Microcystin concentrations were between 0.06 to 11.7 μg L –1, but for six months the concentrations exceeded 1 μg L–1 (1.1 to 11.7 μg L –1), with the highest concentrations observed in August and October. We recorded 33 species of rotifers, including Brachionus angularis (1 to > 11000 ind. L–1) and Brachionus havanaensis (1 to 6683 ind. L –1), while the most abundant cladoceran was Moina micrura (about 10 ind. L–1). The species diversity ranged from 0.8 to 2.9 bits ind–1, but small (< 250 μm) zooplankton (rotifers and copepod nauplii) dominated the community.

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Water quality and potamoplankton evaluation of the Nile River in Upper Egypt

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x4014 ◽

2015 ◽

Vol 27 (2) ◽

pp. 171-190 ◽

Cited By ~ 8

Author(s):

Ahmed Mohamed El-Otify ◽

Isaac Agaiby Iskaros

Keyword(s):

Community Structure ◽

Zooplankton Community ◽

Water Level Fluctuations ◽

Main Stream ◽

Upper Egypt ◽

Physical And Chemical Variables ◽

Different Seasons ◽

High Current Velocity ◽

Major Nutrients ◽

Physical And Chemical

Aim: The composition, abundance, community structure of potamoplankton and major physical and chemical variables of the Nile water in Upper Egypt were investigated to assess its status in different seasons during 2007.MethodsWater samples were collected seasonally during 2007 from six investigated sites from variable depths at levels of 0, 2.5 and 5 m. The area of this investigation is defined as the southern 120 Km of the main stream of the Nile in Upper Egypt (24° 04’ – 25° 00’ latitudes and 32° 51’ – 32° 54’ longitudes), downstream of Aswan Old Dam.ResultsAltogether, 121 potamoplankton species, of which 85 related to phytoplankton and 36 appertaining to zooplankton were recorded. Most numerous phytoplankton were Chlorophyceae (42 species) followed by Bacillariophyceae (30 species). Cyanobacteria and Dinophyceae were less numerous with only 11 and 2 species, respectively. Zooplankton species were mainly belonging to three systematic groups namely; Rotifera (24 species), Copepoda (3 species) and Cladocera (9 species). Besides, other rare zooplankton including Platyhelminthes, Nemata and Ciliophora were sparsely encountered. The main hydrological conditions characterizing the investigated area include water level fluctuations (˂82 - ˃85 m above sea level), relatively high current velocity (0.8 - 1.3 m sec–1) and disposal of wastewater. Plankton populations were variably but rather weakly dependent on the major nutrients due to their excessive availability in accessible form for uptake by the producers. For phytoplankton, the community structure was categorized in relation to temperature, pH, SO42– and Mg2+. For zooplankton, the community structure was categorized in relation to conductivity as well as Mg2+. Sampling intervals were inadequate to demonstrate the existing successional pattern of the Nile potamoplankton community. Alterations in the phytoplankton community structure accompanied changes in water temperature represented by the alternate dominance between diatoms and cyanobacteria, while zooplankton community was always dominated by rotifers. Phytoplankton populations were numerically more abundant in autumn and zooplankton peaked in spring.ConclusionsWastewater disposal restricted the abundance of the Nile zooplankton assemblages mainly due to the numerical decline of Rotifera and Cladocera. Otherwise, wastewater did not exert major limits for phytoplankton. The data obtained in this investigation will be crucial to understand potamoplankton regulation and contribute to the knowledge regarding the Limnology of the Nile basin.

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ZOOPLANKTON SPATIAL DISTRIBUTION AND COMMUNITY STRUCTURE IN BANGGAI SEA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v4i2.7787 ◽

2012 ◽

Vol 4 (2) ◽

Author(s):

Arief Rachman ◽

Elly Asniariati

Keyword(s):

Spatial Distribution ◽

Community Structure ◽

Hot Spot ◽

Zooplankton Community ◽

Anthropogenic Activity ◽

Zooplankton Abundance ◽

Total Density ◽

Importance Value ◽

Zooplankton Community Structure ◽

Specific Distribution

Banggai Sea is an interesting ecosystem due to mixing influences from Banda Sea in the west and Maluccas Sea in the east. Therefore, a unique zooplankton community structure and specific distribution pattern should be found in this area. This research was carried on using Baruna Jaya VIII research vessel and samples were collected in 14 sampling stations. Vertical towing using NORPAC plankton net (300 μm) was conducted to collect zooplankton samples. Result showed that inner Mesamat Bay had the lowest abundance of zooplankton, probably due to low water quality resulted from anthropogenic activity. Meanwhile the strait between Liang and Labobo Island had the highest zooplankton abundance in Banggai Sea. Calanoids was the dominant zooplankton taxa in the ecosystem and contributing 55.7% of total density of zooplankton community. The highest importance value made this taxa to be very important factor that regulates the lower trophic level organisms. Results also showed that zooplankton was distributed nearly uniform in eastern but aggregated to several stations in western Banggai Sea. Zooplankton abundance was higher in the central of Banggai Sea, compared to western and eastern area. According to Bray-Curtis clustering analysis the strait between Liang and Labobo Island has unique zooplankton community structure. This might happened due to mixing of water from two highly productive seas that influenced the Banggai Sea ecosystem. From this research we conclude that this strait probably was the zooplankton hot spot area which might also indicate that this area also a hot spot of fishes in the Banggai Sea.Keywords: spatial distribution, zooplankton, community structure, hot spot, Banggai

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Seasonal variation of zooplankton community structure and trophic position in the Celtic Sea: A stable isotope and biovolume spectrum approach

Progress In Oceanography ◽

10.1016/j.pocean.2018.03.012 ◽

2019 ◽

Vol 177 ◽

pp. 101943 ◽

Cited By ~ 8

Author(s):

Sarah L.C. Giering ◽

Seona R. Wells ◽

Kyle M.J. Mayers ◽

Hanna Schuster ◽

Louise Cornwell ◽

...

Keyword(s):

Community Structure ◽

Seasonal Variation ◽

Stable Isotope ◽

Trophic Position ◽

Zooplankton Community ◽

Zooplankton Community Structure ◽

Celtic Sea

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Meso- and macro-zooplankton community structure of the Amundsen Sea Polynya, Antarctica (Summer 2010–2011)

Elem Sci Anth ◽

10.12952/journal.elementa.000033 ◽

2015 ◽

Vol 3 ◽

Cited By ~ 10

Author(s):

Stephanie E. Wilson ◽

Rasmus Swalethorp ◽

Sanne Kjellerup ◽

Megan A. Wolverton ◽

Hugh W. Ducklow ◽

...

Keyword(s):

Community Structure ◽

Trophic Position ◽

Mixed Layer Depth ◽

Zooplankton Community ◽

Thick Layer ◽

Trophic Levels ◽

Zooplankton Abundance ◽

Amundsen Sea ◽

Zooplankton Community Structure ◽

Pigment Ratios

Abstract The Amundsen Sea Polynya (ASP) has, on average, the highest productivity per unit area in Antarctic waters. To investigate community structure and the role that zooplankton may play in utilizing this productivity, animals were collected at six stations inside and outside the ASP using paired “day-night” tows with a 1 m2 MOCNESS. Stations were selected according to productivity based on satellite imagery, distance from the ice edge, and depth of the water column. Depths sampled were stratified from the surface to ∼ 50–100 m above the seafloor. Macrozooplankton were also collected at four stations located in different parts of the ASP using a 2 m2 Metro Net for krill surface trawls (0–120 m). The most abundant groups of zooplankton were copepods, ostracods, and euphausiids. Zooplankton biovolume (0.001 to 1.22 ml m-3) and abundance (0.21 to 97.5 individuals m-3) varied throughout all depth levels, with a midsurface maximum trend at ∼ 60–100 m. A segregation of increasing zooplankton trophic position with depth was observed in the MOCNESS tows. In general, zooplankton abundance was low above the mixed layer depth, a result attributed to a thick layer of the unpalatable colonial haptophyte, Phaeocystis antarctica. Abundances of the ice krill, Euphausia crystallarophias, however, were highest near the edge of the ice sheet within the ASP and larvae:adult ratios correlated with temperature above a depth of 60 m. Total zooplankton abundance correlated positively with chlorophyll a above 150 m, but negative correlations observed for biovolume vs. the proportion of P. antarctica in the phytoplankton estimated from pigment ratios (19’hexanoyloxyfucoxanthin:fucoxanthin) again pointed to avoidance of P. antarctica. Quantifying zooplankton community structure, abundance, and biovolume (biomass) in this highly productive polynya helps shed light on how carbon may be transferred to higher trophic levels and to depth in a region undergoing rapid warming.

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ZOOPLANKTON COMMUNITY STRUCTURE AT MAJAKERTA ESTUARY AND ITS SURROUNDING WATERS, INDRAMAYU REGENCY, WEST JAVA PROVINCE

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v9i1.17919 ◽

2017 ◽

Vol 9 (1) ◽

pp. 91

Author(s):

Happy Widyarini ◽

Niken T.M. Pratiwi ◽

. Sulistiono

Keyword(s):

Community Structure ◽

Diversity Index ◽

Zooplankton Community ◽

Chemical Parameters ◽

Zooplankton Community Structure ◽

Fishery Resource ◽

Group 2 ◽

Station Group ◽

Physical And Chemical ◽

Group 1

Majakerta estuary and its surrounding waters have a high potential fishery resource which is commonly utilized by the community around the area. Fluctuation of physical and chemical parameters of the waters and fishery activities around the estuary can influence the existence of zooplankton. This study was conducted from December 2014 to May 2015. Samples of the zooplankton were collected monthly at four stations (consisted of sea, river and estuary areas). Based on the study, zooplankton in the Majakerta estuary and its surrounding waters consisted of six classes; i.e. Protozoa (11 genera), Crustaceae (4 genera, 1 nauplius stadia), and Rotifera (4 genera). A higher abundance was found at the sea (29025 ind./m3), while a lower abundance was at the river and estuary (7147 ind./m3 dan 7582 ind./m3). Based on the zooplankton diversity index, it can be inferred that the value was relatively low. There were two habitat groups, namely Station Group 1 (Station 1 and 2; river and estuary) and Station Group 2 (Station 3 and 4; sea) with influencing parameters such as transparency, pH, and salinity. Keywords: estuary, Majakerta, zooplankton, community structure

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Distribution of zooplankton in the Indian sector of the Southern Ocean

Antarctic Science ◽

10.1017/s0954102019000579 ◽

2020 ◽

Vol 32 (3) ◽

pp. 168-179 ◽

Cited By ~ 2

Author(s):

V. Venkataramana ◽

N. Anilkumar ◽

K. Swadling ◽

R.K. Mishra ◽

S.C. Tripathy ◽

...

Keyword(s):

Community Structure ◽

Southern Ocean ◽

Temperature Region ◽

Zooplankton Community ◽

Polar Front ◽

Zooplankton Abundance ◽

Dominant Group ◽

Zooplankton Community Structure ◽

Frontal Zones ◽

Indian Sector

AbstractThe community composition of zooplankton with an emphasis on copepods was assessed in the frontal zones of the Indian sector of the Southern Ocean (SO) during summer 2013. Copepods were the dominant group in both the bongo net and multiple plankton sampler across the entire region. High zooplankton abundance was recorded along each transect in the Polar Front (PF). Community structure in this front was dominated by common taxa, including Ctenocalanus citer, Clausocalanus spp., Calanoides acutus, Calanus propinquus, Calanus australis and Rhincalanus gigas, which together accounted for > 62% of the total abundance. Calocalanus spp., Neocalanus tonsus and C. propinquus were indicator species in the Sub-Tropical Front (STF), Sub-Antarctic Front and PF, respectively. A strong contrast in population structure and biovolume was observed between then PF and the STF. The community structure of smaller copepods was associated with the high-temperature region, whereas communities of larger copepods were associated with the low-temperature region. Thus, it seems probable that physical and biological characteristics of the SO frontal regions are controlling the abundance and distribution of zooplankton community structure by restricting some species to the warmer stratified zones and some species to the well-mixed zone.

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Spatial variability of zooplankton community structure in Colombian Caribbean waters during two seasons

Revista de Biología Tropical ◽

10.15517/rbt.v66i2.33401 ◽

2018 ◽

Vol 66 (2) ◽

Cited By ~ 1

Author(s):

Johanna Medellín-Mora ◽

Rubén Escribano ◽

Wolfgang Schneider ◽

Marco Correa-Ramírez ◽

Nestor Campos

Keyword(s):

Community Structure ◽

Sea Level ◽

Chlorophyll A ◽

Environmental Variables ◽

Stepwise Regression ◽

Zooplankton Community ◽

Automated Image Analysis ◽

Taxonomic Structure ◽

Zooplankton Abundance ◽

Zooplankton Community Structure

Zooplankton is an important component to understand oceanographic dynamics, they are considered good indicators of environmental variability, since most species are short-lived they can be tight coupling of climate and population dynamics, and some taxa are sensitive to variables such as temperature, quality and quantity of food, oxygenation and stratification. In the Colombian Caribbean two oceanographic cruises were carried out, in order to characterize and analyze the biodiversity of the continental margin, for the periods May-June 2008 and November-December 2009. The objective of this study was to determine which oceanographic variable was the most important in the distribution of zooplankton in the oceanic waters, and how the variables structure the community. In each cruise, zooplankton samples were obtained by vertical hauls with a 1 m2 diameter conical net (200 μm mesh size). The zooplankton community structure was studied by automated image analysis (ZooImage), which combined with abundance data, allowed to calculate the slope of size spectrum, and diversity indexes of taxa and sizes. The environmental variables included temperature, salinity, oxygen and chlorophyll a of the water column, and were used to calculate the stratification with the Brunt-Vaiisala frequency; this information was complemented by satellite images of temperature, surface chlorophyll, geostrophic currents and sea level, obtained from MODIS and AQUA products. The association between environmental variables and the zooplankton community structure was determined using Spearman’s correlation ranges with the Bioenv routine and a stepwise regression model, and Principal component analysis (PCA). Our results showed spatial and temporal patterns in the oceanographic conditions of the study area, such as upwelling in the Northeast region, strong stratification in the Southwest, and mesoscale activity. The abundance of zooplankton exhibited differences between the two climatic seasons and zones. Temporal differences were also evident in the size and diversity of taxa (ANOVA 2-way p <0.05). These changes were related to the moderate upwelling and the activity of mesoscale eddies. Cyclonic and anticyclonic eddies of variable size can either transport or retain zooplankton over cross-shelf and oceanic areas, thus modifying the taxonomic structure of the community. According to the Bioenv analysis, the main variables that explained the abundance and composition of zooplankton were sea level and chlorophyll a (Spearman correlation = 0.49). The stepwise regression showed that stratification, oxygen and chlorophyll a were the most important predictors of zooplankton abundance and size. Rev. Biol. Trop. 66(2): 688-708. Epub 2018 June 01.

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ZOOPLANKTON COMMUNITY STRUCTURE AT MAJAKERTA ESTUARY AND ITS SURROUNDING WATERS, INDRAMAYU REGENCY, WEST JAVA PROVINCE

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v9i1.17919 ◽

2017 ◽

Vol 9 (1) ◽

pp. 91-103 ◽

Cited By ~ 1

Author(s):

Happy Widyarini ◽

Niken T.M. Pratiwi ◽

. Sulistiono

Keyword(s):

Community Structure ◽

Diversity Index ◽

Zooplankton Community ◽

Chemical Parameters ◽

Zooplankton Community Structure ◽

Fishery Resource ◽

Group 2 ◽

Station Group ◽

Physical And Chemical ◽

Group 1

Majakerta estuary and its surrounding waters have a high potential fishery resource which is commonly utilized by the community around the area. Fluctuation of physical and chemical parameters of the waters and fishery activities around the estuary can influence the existence of zooplankton. This study was conducted from December 2014 to May 2015. Samples of the zooplankton were collected monthly at four stations (consisted of sea, river and estuary areas). Based on the study, zooplankton in the Majakerta estuary and its surrounding waters consisted of six classes; i.e. Protozoa (11 genera), Crustaceae (4 genera, 1 nauplius stadia), and Rotifera (4 genera). A higher abundance was found at the sea (29025 ind./m3), while a lower abundance was at the river and estuary (7147 ind./m3 dan 7582 ind./m3). Based on the zooplankton diversity index, it can be inferred that the value was relatively low. There were two habitat groups, namely Station Group 1 (Station 1 and 2; river and estuary) and Station Group 2 (Station 3 and 4; sea) with influencing parameters such as transparency, pH, and salinity. Keywords: estuary, Majakerta, zooplankton, community structure

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