Zooplankton Species Abundance and Biomass in Relation to Occurrence of Mysis relicta (Malacostraca: Mysidacea)

1986 ◽  
Vol 43 (2) ◽  
pp. 420-434 ◽  
Author(s):  
Redwood W. Nero ◽  
W. Gary Sprules
Keyword(s):  
Species Differences ◽  
Species Abundance ◽  
Canonical Analysis ◽  
Zooplankton Abundance ◽  
Zooplankton Species ◽  
Mysis Relicta ◽  
Isothermal Conditions ◽  
Competitive Release ◽  
Lakes And Reservoirs ◽  
Cyclops Scutifer

Year-long comparisons of the occurrence and abundance of zooplankton between two lakes where Mysis relicta is endemic and two where it is not show that in the former, hypolimnetic species Daphnia longiremis, Euhosmina longispina, Cyclops scutifer, and Diaptomus sanguineus are rare. Five other cladocerans were also lower in abundance in hypolimnetic strata and during isothermal conditions. Diaphanosoma spp. were more abundant in the metalimnion of lakes with Mysis; we suggest a competitive release through Mysis predation on Daphnia. Because each pair of lakes is comparable with respect to morphometry and chemistry, nonpredatory influences do not account for the observed distribution of zooplankton. Such species differences are also identical to trends occurring in a canonical analysis of zooplankton abundance for 497 lakes in eastern Ontario and western Quebec and corroborate declines in Cladocera associated with introductions of M. relicta into lakes and reservoirs.

scholarly journals Impact of changing oceanographic conditions on species composition and abundance of zooplankton on the fishing grounds at Cape Navarin and their importance for the Russian pollock fishery in the Bering Sea

2017 ◽  
Vol 189 (2) ◽  
pp. 103-120
Author(s):  
Yury I. Zuenko ◽  
Eugene O. Basyuk
Keyword(s):  
Species Composition ◽  
Bering Sea ◽  
Cold Water ◽  
Zooplankton Abundance ◽  
Zooplankton Species ◽  
Shape Dependence ◽  
Spawning Areas ◽  
Species Specific ◽  
Bering Sea Shelf ◽  
The Bering Sea

Seasonal and interannual variability of zooplankton in the area at Cape Navarin are considered on the base of long-term surveys. This area is the main fishing grounds for Russian pollock fishery in the Bering Sea. Species composition of zooplankton changes cardinally during the feeding period: large-size copepods prevail in summer, but euphausiids, mainly the krill Thysanoessa inermis - in autumn. Year-to-year changes of the zooplankton abundance are species-specific and driven by different environmental factors. The water circulation is crucially important for such allochtonous species as krill by transporting them from the spawning areas. Advection either from the south, i.e. from the continental slope (till 2006), or from the east and west, i.e. from the shelf (in 2007-2014), was observed in the last two decades that corresponded to replacing of relatively warm oceanographic regime by relatively cold regime and could be traced by dynamics of the ice cover and the cold water pool area on the eastern Bering Sea shelf. The advection from the slope provides the krill transport to the area at Cape Navarin, but conditions of the cold regime limit the transport. From the other hand, the cold oceanographic regime is favorable for reproduction of many zooplankton species, including krill, because of higher primary productivity. As the result, the krill and some other mass zooplankton species have a bell-shape dependence of their abundance on water temperature: they have the maximal biomass in relatively warm years within the cold periods and in relatively cold years within the warm periods. In the years with severe winters, the pollock starts its back migration early, in August-September because of seasonal depletion of copepods and lack of krill, while the years with warm winters are also unfavorable for long feeding of pollock in the Navarin area because of low abundance of many zooplankton species. «Moderate» conditions are optimal for long feeding of pollock in this area, when the Russian fishery continues here longer, till November-December, with the annual landings > 500,000 t (as in 1996-1999, 2001, 2007-2008).

scholarly journals Zooplankton species composition and diversity in the seagrass habitat of Lawas, Sarawak, Malaysia

2021 ◽  
Vol 9 ◽  
Author(s):  
Johan Ismail ◽  
Abu Hena Mustafa Kamal ◽  
Mohd Hanafi Idris ◽  
S. M. Nurul Amin ◽  
Hadi Hamli ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Abiotic Factors ◽  
Species Abundance ◽  
Seagrass Habitat ◽  
Zooplankton Species ◽  
Analysis Model ◽  
Marine Fauna ◽  
Important Species ◽  
Parvocalanus Crassirostris ◽  
Chemical Conditions

Seagrass habitats are considered to be some of the most biodiverse ecosystems on the planet and safeguard some ecologically and economically important fauna, amongst which are some globally threatened species, including dugong. Malaysian seagrass ecosystems are not widespread, but their existence supports some significant marine fauna. A rigorous zooplankton study was conducted from May 2016 to February 2017, in the seagrass habitat of Lawas, Sarawak, Malaysia, to examine their temporal composition and diversity, together with their ecological influences. A total of 45 zooplankton species from 13 significant groups were recorded in the seagrass habitat. The population density of zooplankton ranged between 2,482 ind/m³ and 22,670 ind/m³ over three different seasons. A single zooplankton copepod was found to be dominant (47.40%), while bivalves were the second largest (31.8%) group in terms of total abundance. It was also noticed that the average relative abundance (0.62) and important species index (62.08) of copepods were higher than for other groups that exist in the seagrass meadow, whereas copepod Parvocalanus crassirostris showed both the highest average relative abundance (0.41) and the highest important species index (41.15). The diversity (H') and richness index of the intermediate season were found to be highest due to favourable physico-chemical conditions. Within the referred seasonal cluster, the wet and dry seasons were almost similar in terms of species abundance, while the intermediate season was distinct, with high species diversity backed by ANOSIM analysis results. Copepod and bivalves formed one group with a common similarity level of 0.80. The CCA (Canonical Correspondence Analysis) model established that abiotic factors, especially turbidity, NO2, rainfall, dissolved oxygen and pH were significantly correlated with abundance of individual groups of zooplankton. Zooplankton assemblage and abundance in Lawas were found to be very rich in multiple seasons, indicating that the productivity of uninterrupted seagrass habitat might be high and the system rich in biodiversity.

8. The Effect of Bythotrephes Longimanus on the Size Structure of Zooplankton Communities in the Muskoka Region, Ontario

2017 ◽  
Author(s):  
Johanna Pokorny
Keyword(s):  
Large Scale ◽  
Size Structure ◽  
Scale Effects ◽  
Regional Scale ◽  
Zooplankton Community ◽  
Zooplankton Abundance ◽  
Bythotrephes Longimanus ◽  
Zooplankton Species ◽  
Community Size ◽  
Zooplankton Communities

Invasive species are considered the greatest threat to aquatic ecosystem biodiversity. Bythotrephes longimanus, an exotic zooplankton species introduced to North America in the 1980s, is threatening the structure of indigenous aquatic ecosystems as it continues to invade inland Ontario lakes. As a predacious zooplankton species, B. longimanus has been shown to decrease zooplankton abundance, species richness and shift zooplankton community size structure in invaded lakes. However, much of the previous research concerning the predatory effects of B. longimanus has been on surveys of a small number of lakes or has been in controlled mesocosm or lab-based experiments. This study examines the effects of B. longimanus on the zooplankton community using size-structure characterizations (grouping individuals from the community based on size) as community measures for 311 lakes in the Muskoka Region, a highly invaded watershed in Southern Ontario. More specifically, the study explores the size-spectra of invaded versus uninvaded lakes, with reference to an array of environmental lake characteristics (water chemistry, lake morphometry,etc.), and the relevance of B. longimanus activity on the regional scale. By using such a large-scale survey we will be able to appreciate regional-scale effects, as well as encompass the multiple and more indirect trophic interactions that B. longimanus is likely having with the entire aquatic community. (Funding: NSERC & CAISN.)

scholarly journals Remembrance of things past: modelling the relationship between species' abundances in living communities and death assemblages

2011 ◽  
Vol 8 (1) ◽  
pp. 131-134 ◽  
Author(s):  
Thomas D. Olszewski
Keyword(s):  
Half Life ◽  
Species Differences ◽  
Species Abundance ◽  
Time Averaging ◽  
Ecological Communities ◽  
Post Mortem ◽  
Death Assemblages ◽  
Species Abundances ◽  
The Relationship ◽  
Range Of Variation

Accumulations of dead skeletal material are a valuable archive of past ecological conditions. However, such assemblages are not equivalent to living communities because they mix the remains of multiple generations and are altered by post-mortem processes. The abundance of a species in a death assemblage can be quantitatively modelled by successively integrating the product of an influx time series and a post-mortem loss function (a decay function with a constant half-life). In such a model, temporal mixing increases expected absolute dead abundance relative to average influx as a linear function of half-life and increases variation in absolute dead abundance values as a square-root function of half-life. Because typical abundance distributions of ecological communities are logarithmically distributed, species' differences in preservational half-life would have to be very large to substantially alter species' abundance ranks (i.e. make rare species common or vice-versa). In addition, expected dead abundances increase at a faster rate than their range of variation with increased time averaging, predicting greater consistency in the relative abundance structure of death assemblages than their parent living community.

scholarly journals Aquatic invertebrate of mikulovské rybníky ponds

2007 ◽  
Vol 55 (2) ◽  
pp. 77-84
Author(s):  
Ivo Sukop
Keyword(s):  
Species Composition ◽  
Daphnia Magna ◽  
Aquatic Invertebrates ◽  
Fish Stock ◽  
Zooplankton Abundance ◽  
Qualitative Composition ◽  
Zooplankton Species ◽  
Fish Stocks ◽  
Bosmina Longirostris ◽  
High Fish

The qualitative composition of aquatic invertebrates and zooplankton abundance of the Mikulovské rybníky ponds is presented in the study. Size and species composition of zooplankton in studied ponds was influenced by high fish stocks in 1992–1994. In many cases, small taxa (Rotatoria, copepod Acanthocyclops robustus and cladoceran Bosmina longirostris) formed the zooplankton assemblage. Large zooplankton species (e.g. Daphnia magna) dominated only occasionaly and exclusively in ponds with low fish stock.

scholarly journals The Dynamic of Blue-Green Algae (Cyanobacteria) in Eutrophic Tropical Waters, The Cirata Reservoir

2021 ◽  
Vol 1 (1) ◽  
pp. 1-6
Author(s):  
Fariha Luthfiani ◽  
Sunardi Sunardi ◽  
Hikmat Kasmara
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Green Algae ◽  
Diversity Index ◽  
Species Abundance ◽  
Secondary Data ◽  
Environmental Parameters ◽  
Quality Parameters ◽  
Zooplankton Abundance ◽  
Blue Green Algae

The quality of reservoir waters depends on changes in their physical, chemical, and biological components. Changes in these parameters lead to the emerging of many problems in the reservoir, such as eutrophication and changes in the composition of the phytoplankton community in the reservoir ecosystem. This eutrophication impact can trigger an explosion of dangerous phytoplankton population, such as blue-green algae (Cyanobacteria). Research on the relationship between water quality and the community structure of Cyanobacteria has been carried out. This study used secondary data from the water monitoring report of the Cirata Reservoir from 2013-2017. This study aimed to obtain information on the community structure of Cyanobacteria and environmental parameters that affected the abundance of Cyanobacteria in the reservoir. Species abundance, diversity index, and dominance index were analyzed to determine changes in the community structure of Cyanobacteria in each of the years. Cyanobacteria abundances were classified using cluster analysis. Water quality parameters such as temperature, transparency, pH, carbon dioxide, nitrate, nitrite, and zooplankton abundance as independent variables, and levels of Cyanobacteria abundances as the dependent variable was analyzed using discriminant analysis. This study showed that the abundance of Cyanobacteria in the Cirata Reservoir is dominated by the Stanieria (a genus of the Pleurocapsales order) every year and the parameter that significantly affects the level of Cyanobacteria abundance was nitrate (NO3-N).

scholarly journals Abundance and seasonal diversity of zooplankton in coastal aquatic environments of Mathbaria, Bangladesh

1970 ◽  
Vol 20 (2) ◽  
pp. 163-171
Author(s):  
Pronob Kumar Mozumder ◽  
M Niamul Naser ◽  
Monirul Alam ◽  
Anwar Huq
Keyword(s):  
Surface Water ◽  
Key Words ◽  
Water Column ◽  
Relative Abundance ◽  
Frequent Occurrence ◽  
Aquatic Environments ◽  
Zooplankton Abundance ◽  
Zooplankton Species ◽  
Seasonal Diversity

Monthly seasonal diversity and abundance of zooplankton species at three ponds of Mathbaria were investigated from surface water column during January 2008 to December 2008. Thirty?six species of zooplankton were identified from the ponds. Among these, 25 belonged to rotifer, six were of protozoan, three were copepods and one each from cladocera and ostracoda. Nauplii (copepods) were the most abundant (39.09% in site 1, 36.81% in site 2, and 33.06% in site 3) group, while the ostracoda were the least abundant (0.1% in site 2) group. The relative abundance was maximum (39.09%) for nauplii and minimum (4.56%) for cladocera in site 1; maximum (36.81%) for nauplii and minimum (0.1%) for ostracoda in site 2; maximum (33.15%) for rotifer and minimum (1.17%) for Cladocera in site 3. The species of frequent occurrence (100%) were Cyclops sp. and copepoda nauplius. In Bangladesh, cholera outbreaks have two major peaks, one between March to May and other between August to October. This study shows that, seasonal diversity and abundance of zooplankton species varied with seasons, the zooplankton peaks coincide to the reported peak outbreak of cholera at the area. Key words: Seasonal diversity; Mathbaria; Zooplankton; Abundance DOI: http://dx.doi.org/10.3329/dujbs.v20i2.8977 DUJBS 2011; 20(2): 163-171

Bioaccumulation of heavy metals in mesozooplankton from a human-impacted south western Atlantic estuary (Argentina)

2019 ◽  
Vol 77 (1) ◽  
pp. 217-241 ◽  
Author(s):  
Diana M. Villagran ◽  
Melisa Fernández D. Severini ◽  
Florencia Biancalana ◽  
Carla V. Spetter ◽  
Eleonora M. Fernández ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Larval Stage ◽  
Anthropogenic Impacts ◽  
Acartia Tonsa ◽  
Zooplankton Abundance ◽  
Zooplankton Species ◽  
Western Atlantic ◽  
Maritime Traffic ◽  
High Concentrations ◽  
Eurytemora Americana

The total metal concentrations (Cd, Cu, Pb, Zn, Mn, Ni, Cr, and Fe) in the mesozooplankton (200 μm–2 mm) were studied for a year in a human-impacted estuary strongly affected by urban and industrial discharges located in the South Atlantic. Over the last 25 years, this estuary has been the site of significant anthropogenic impacts including industrial activities, maritime traffic, and regular dredging. A quantitative and qualitative analysis was also carried out to identify the mesozooplanktonic community that was sampled for metal determinations. The mesozooplankton had high concentrations of toxic metals such as Cd, Pb, Cr, and Ni, which may indicate that these organisms are strong accumulators of these metals. Also, the analyzed metals had a wide temporal variation, the highest levels being in autumn and spring. The ranges were as follows: cadmium (Cd): 0.3–3.8; copper (Cu): 35.3–226.6; chromium (Cr): 1.4–57.9; iron (Fe): 1060–57370; manganese (Mn): 18–1102; nickel (Ni): 2.8–57.3; lead (Pb): 2.4–66.7; zinc (Zn): 97.6–1872.2 (μg g –1dry weight). Total zooplankton abundance also showed a significant temporal variation and the most important taxa were the copepods Acartia tonsa, Eurytemora americana, the barnacle Balanus spp. (in the nauplius larval stage), and the crab Cyrtograpsus altimanus (in the zoea larval stage).<br/> In zooplankton, all the metals were detected throughout the whole sampling year and at all sampling sites, which suggests the presence of continuous or quasi-continuous sources of these contaminants. Thus, the most abundant zooplankton species could be considered as potential biomonitors for trace metals in heavily impacted marine environments like estuaries.

scholarly journals Temporary fragmentation of a marginal lake and its effects on zooplankton community structure and organization

2009 ◽  
Vol 69 (3) ◽  
pp. 819-835 ◽  
Author(s):  
R. Nadai ◽  
R. Henry
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Zooplankton Community ◽  
Zooplankton Abundance ◽  
Abiotic Factor ◽  
Zooplankton Species ◽  
Drought Period ◽  
Zooplankton Community Structure ◽  
Species Richness And Diversity ◽  
Disturbance Factor

A river lateral lake (Coqueiral Lake marginal to Paranapanema River in its mouth zone into Jurumirim Reservoir, São Paulo, Brazil) presented fragmentation into four small isolated bodies of water during a prolonged drought period, disrupting the link with the river. The aim of this work was to compare the temporal modifications on zooplankton community structure (total abundance, species richness, and diversity) in the four water bodies. Zooplankton samplings and abiotic factor measurements were made in two periods - during isolation phase of the lake in relation to river and after re-establishment of hydrologic connectivity. A concentration effect on zooplankton abundance was recorded with drought progression, but without significant modifications in species richness and diversity. When the river inundation pulse occurred, a reduction in total zooplankton density was observed due to the dilution effect and a significant increase in species richness and diversity was recorded. Lateral water influx from the river to the lacustrine environment acts as a temporary disturbance factor on the zooplankton community structure. Zooplankton species composition presented some modifications between the two periods. Zooplankton organism drift in water from the river to the lake, removal of individuals from the aquatic macrophytes, and eclosion of resting eggs from sediment are probable factors that can increase zooplankton species richness immediately after lateral pulse inundation with water by the river.

scholarly journals Experimental evidence of competitive release in sympatric carnivores

2007 ◽  
Vol 4 (2) ◽  
pp. 170-172 ◽  
Author(s):  
Iain D Trewby ◽  
Gavin J Wilson ◽  
Richard J Delahay ◽  
Neil Walker ◽  
Richard Young ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Vulpes Vulpes ◽  
Management Practices ◽  
Red Fox ◽  
Species Abundance ◽  
Meles Meles ◽  
Zoonotic Diseases ◽  
Competitive Release ◽  
Sympatric Carnivores ◽  
Species Declines

Changes in the relative abundance of sympatric carnivores can have far-reaching ecological consequences, including the precipitation of trophic cascades and species declines. While such observations are compelling, experimental evaluations of interactions among carnivores remain scarce and are both logistically and ethically challenging. Carnivores are nonetheless a particular focus of management practices owing to their roles as predators of livestock and as vectors and reservoirs of zoonotic diseases. Here, we provide evidence from a replicated and controlled experiment that culling Eurasian badgers Meles meles for disease control was associated with increases in red fox Vulpes vulpes densities of 1.6–2.3 foxes km −2 . This unique experiment demonstrates the importance of intraguild relations in determining species abundance and of assessing the wider consequences of intervention in predator populations.

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