Long-term dynamics of the zooplankton community during large salinity fluctuations in a coastal lagoon

2015 ◽  
Vol 66 (4) ◽  
pp. 352 ◽  
Author(s):  
Luciana Rabelo Araújo ◽  
Paloma Marinho Lopes ◽  
Jayme Magalhães Santangelo ◽  
Francisco de Assis Esteves ◽  
Reinaldo Luiz Bozelli
Keyword(s):  
Species Richness ◽  
Total Phosphorus ◽  
Coastal Lagoon ◽  
Zooplankton Community ◽  
Zooplankton Community Structure ◽  
Egg Bank ◽  
Resting Egg ◽  
Low Salinity ◽  
Resting Egg Bank

Aquatic coastal systems are affected by high fluctuations in salinity and the zooplankton may rely on dispersal or dormancy to recolonise these environments. Here, we analysed the long-term dynamics of the zooplankton community over 6 years during large salinity fluctuations in a coastal lagoon (Garças Lagoon, Brazil) and the effect of salinity on the hatching patterns of the resting egg bank. We hypothesised that salinity is the main driving factor of the zooplankton community structure, and that increases in salinity reduce the species richness and the abundance of hatchlings. Multiple regression analysis showed that salinity was associated negatively with species richness in the open water, whereas total phosphorus and chlorophyll-a concentrations were negatively and positively related to abundance respectively. Redundancy analysis demonstrated that temporally structured environmental variables (total phosphorus and salinity) were important for zooplankton composition. Periods of low salinity allowed the presence of freshwater organisms, changing the zooplankton composition over the years. However, our hatchling experiment showed a depauperate resting egg bank. Overall, our results showed a strong influence of salinity on the structure and dynamics of the zooplankton at Garças Lagoon, and that the resting egg bank likely plays a minor role in the zooplankton colonisation during low-salinity periods.

Historic Changes in Lake Michigan Zooplankton Community Structure: The 1960s Revisited with Implications for Top-Down Control

1992 ◽  
Vol 49 (8) ◽  
pp. 1734-1749 ◽  
Author(s):  
Marlene S. Evans
Keyword(s):  
Community Structure ◽  
Lake Michigan ◽  
Species Abundance ◽  
Zooplankton Community ◽  
Water Clarity ◽  
Phosphorus Loading ◽  
Top Down ◽  
Zooplankton Community Structure ◽  
The 1960S

Recent changes in the Lake Michigan ecosystem provide a benchmark against which to reevaluate historic data. During the 1960s, the alewife (Alosa pseudoharengus) population exploded and then crashed. Offshore zoo-plankton data for the summers of 1954, 1966, and 1968 provided evidence that variations in alewife abundance had a major effect on zooplankton community structure. Based on these observations, other researchers have hypothesized that increased and decreased phytoplankton abundances during the 1960s as recorded at the Chicago water filtration plant were due to top-down effects rather than to phosphorus loading. This argument is reevaluated using two approaches. First, from the relationship between interannual variability in alewife and zooplankton species abundance during the summers of 1954, 1966, 1968, 1977, 1982, and 1984–87, I conclude that the effects of alewife predation on zooplankton community structure during the 1960s are less clear then originally proposed. Second, from estimates of Daphnia spp. grazing rates, considerations of the source of the long-term phytoplankton data used to support the top-down argument, regional differences in phytoplankton, zooplankton and alewife abundance trends, and historic water clarity observations, I conclude that existing data are insufficient to support the top-down argument that long-term trends in phytoplankton abundance were primarily affected by fluctuations in alewife abundance.

scholarly journals Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity

2008 ◽  
Vol 5 (6) ◽  
pp. 1765-1782 ◽  
Author(s):  
V. Raybaud ◽  
P. Nival ◽  
L. Mousseau ◽  
A. Gubanova ◽  
D. Altukhov ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Zooplankton Community ◽  
Mesh Size ◽  
Temporal Variations ◽  
Water Masses ◽  
Short Term ◽  
Low Salinity ◽  
Low Salinity Water ◽  
Salinity Water

Abstract. Short term changes in zooplankton community were investigated at a fixed station in offshore waters of the Ligurian Sea (DYNAPROC 2 cruise, September–October 2004). Mesozooplankton were sampled with vertical WP-II hauls (200 μm mesh-size) and large mesozooplankton, macrozooplankton and micronekton with a BIONESS multinet sampler (500 μm mesh-size). Temporal variations of total biomass, species composition and abundance of major taxa were studied. Intrusions of low salinity water masses were observed two times during the cruise. The first one, which was the most intense, was associated with changes in zooplankton community composition. Among copepods, the abundance of Calocalanus, Euchaeta, Heterorhabdus, Mesocalanus, Nannocalanus, Neocalanus, Pleuromammaand also calanoid copepodites increased markedly. Among non-copepod taxa, only small ostracods abundance increased. After this low salinity event, abundance of all taxa nearly returned to their initial values. The influence of salinity on each zooplankton taxon was confirmed by a statistical analysis (Perry's method). The Shannon diversity index, Pielou evenness and species richness were used to describe temporal variations of large copepod (>500 μm) diversity. The Shannon index and Pielou evenness decreased at the beginning of the low salinity water intrusions, but not species richness. We suggest that low salinity water masses contained its own zooplankton community and passed through the sampling area, thus causing a replacement of the zooplankton population.

Phosphorus–Chlorophyll Relationships under Contrasting Zooplankton Community Structure: Potential Mechanisms

1994 ◽  
Vol 51 (2) ◽  
pp. 401-407 ◽  
Author(s):  
Asit Mazumder
Keyword(s):  
Community Structure ◽  
Chlorophyll A ◽  
Total Phosphorus ◽  
Zooplankton Community ◽  
Opposite Pattern ◽  
Zooplankton Community Structure

Data from experimental enclosures and natural and manipulated lakes were used to test whether the variable chlorophyll a (Chl) yields to total phosphorus (TP) can be explained by the variable contributions of dissolved (TDP) and zooplankton phosphorus (ZP; P > 200 μm) to TP. Results indicate that low Chl yields to TP in systems with abundant large Daphnia are closely related to greater contributions of TDP and ZP to TP. An opposite pattern is produced by systems lacking large Daphnia. These patterns seem to be consistent among mesoeutrophic to hypereutrophic systems; Chl yields to TP decline with increasing contributions of TDP to TP. In the large-Daphnia-dominated systems, both high grazing and reduced phosphate demand allow a greater sequestering of P into zooplankton and dissolved pools rather than in algae, which generate a lower observed Chl yields to TP. Conversely, lack of large Daphnia and low grazing rates allow proliferation of small algae, and an associated intense phosphate demand allows greater sequestering of P into small algae rather than into zooplankton and dissolved pools, and consequently, a higher Chl yield to TP is produced.

Disturbances due to increased salinity and the resilience of zooplankton communities: the potential role of the resting egg bank

Hydrobiologia ◽  
2013 ◽  
Vol 722 (1) ◽  
pp. 103-113 ◽  
Author(s):  
Jayme M. Santangelo ◽  
Francisco de A. Esteves ◽  
Marina Manca ◽  
Reinaldo L. Bozelli
Keyword(s):  
Potential Role ◽  
Egg Bank ◽  
Resting Egg ◽  
Resting Egg Bank ◽  
Zooplankton Communities

scholarly journals A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

2015 ◽  
Author(s):  
Marlene S. Arcifa ◽  
Tânia C. Dos Santos Ferreira ◽  
Claudia Fileto ◽  
Maria S. Maioli Castilho-Noll ◽  
Taís C. Bunioto ◽  
...  
Keyword(s):  
Species Richness ◽  
Zooplankton Community ◽  
Tropical Lake ◽  
Long Term Study ◽  
Cladoceran Species ◽  
Before And After ◽  
Crustacean Plankton ◽  
Predator Abundance ◽  
Long Term Impact

<p>The primary factor that governs the size and species composition of zooplankton is still a controversial issue and temperature is considered the main factor responsible for latitudinal differences. In waters with a narrow temperature range, such as in the tropics, predation may be a more important factor. Nearly three decades of intermittent studies of the crustacean plankton in a shallow tropical lake revealed that the main event that led to their restructuring was the appearance of a second predator, the water mite <em>Krendowskia </em>sp. The new predator and larvae of the dipteran <em>Chaoborus brasiliensis</em> Theobald exerted a combined, although asymmetrical effect on microcrustaceans. The period when the mite was detected was followed by the restructuring of the crustacean plankton community. Predation by these two invertebrates emerged as the factor responsible for community changes, involving an increased contribution of copepods and decreases in the relative abundance of smaller cladoceran species. In the short term, the mite caused a decrease in species richness and the annual mean instantaneous composition of cladocerans, a predominance of large-sized species (<em>Daphnia ambigua </em>Scourfield<em> </em>and <em>Daphnia gessneri</em> Herbst) and the virtual disappearance of small species (e.g., <em>Bosmina tubicen</em> Brehm). The long-term impact resulted in increased species richness and the dominance of large and medium-sized cladocerans, such as <em>D. gessneri</em> and <em>Ceriodaphnia richardi</em> Sars. The larger body size of three cladocerans, the two <em>Daphnia</em> species and <em>B. tubicen</em>, in the long term, may be a response to the dominant predator, <em>Chaoborus</em>. The seasonal variation in the predator abundance, mainly <em>Chaoborus </em>larvae, allowed the prey to recover during the cool season. The copepods <em>Tropocyclops prasinus meridionalis</em> (Fischer) and <em>Thermocyclops decipiens</em> Kiefer were less affected by predation than the cladocerans; their contribution to the crustacean plankton increased 12-28% after the mite appeared. The top-down effect on crustacean plankton did not affect the phytoplankton, which remained dominated by chlorophyceans and the nanoplankton fraction before and after the zooplankton community restructuring.</p>

scholarly journals Zooplankton community structure of the lower Xingu River (PA) related to the hydrological cycle

2015 ◽  
Vol 75 (3 suppl 1) ◽  
pp. 47-54 ◽  
Author(s):  
T. Matsumura-Tundisi ◽  
JG. Tundisi ◽  
F. Souza-Soares ◽  
JEM. Tundisi
Keyword(s):  
Species Richness ◽  
Water Level ◽  
Reproductive Strategies ◽  
Hydrological Cycle ◽  
Zooplankton Community ◽  
Aquatic Biodiversity ◽  
Zooplankton Community Structure ◽  
Fundamental Factor ◽  
Xingu River ◽  
Zooplankton Communities

Abstract The zooplankton community of the lower Xingu River shows strong fluctuations in species richness and number of organisms during periods of water level fluctuation. Pulses of density and species richness are adapted to the pulses in water flows and water level. This is conected with reproductive strategies of some zooplankton groups. The spatial heterogeneity of the lower Xingu River consisting of braided channels, bedrocks, macrophyte stands, is probably a relevant factor for the species richness of the zooplankton communities, and may be a fundamental factor for the overall aquatic biodiversity of the lower Xingu River.

scholarly journals Impact of climate change on long-term zooplankton biomass in the upwelling region of the Gulf of Guinea

2008 ◽  
Vol 65 (3) ◽  
pp. 318-324 ◽  
Author(s):  
George Wiafe ◽  
Hawa B. Yaqub ◽  
Martin A. Mensah ◽  
Christopher L. J. Frid
Keyword(s):  
Climate Change ◽  
Climatic Factors ◽  
Southern Oscillation ◽  
Global Climate ◽  
Zooplankton Community ◽  
Zooplankton Biomass ◽  
Gulf Of Guinea ◽  
Zooplankton Community Structure ◽  
Impact Of Climate Change

Abstract Wiafe, G., Yaqub, H. B., Mensah, M. A., and Frid, C. L. J. 2008. Impact of climate change on long-term zooplankton biomass in the upwelling region of the Gulf of Guinea. – ICES Journal of Marine Science, 65: 318–324. We investigated long-term changes in coastal zooplankton in the upwelling region in the Gulf of Guinea, 1969–1992, in relation to climatic and biotic factors. We considered the role of hydrographic and climatic factors, i.e. sea surface temperature (SST), salinity, sea level pressure, windfield, and Southern Oscillation Index (SOI), in the long-term variation of zooplankton in a multiple regression analysis, along with the abundance of Sardinella. Annual variation in zooplankton biomass was cyclical, with the annual peak occurring during the major upwelling season, July–September. Over the 24-year period, there was a downward trend in zooplankton biomass (equivalent to 6.33 ml per 1000 m3 per year). The decomposed trend in SST during the major upwelling revealed gradual warming of surface waters. This trend was believed to be the main influence on the abundance of the large copepod Calanoides carinatus (sensitive to temperatures above 23°C), which appears in the coastal waters only during the major upwelling season. The warming trend associated with global climate change could affect zooplankton community structure, especially during the major upwelling season. Global warming coupled with “top–down” (predation) control by Sardinella might be responsible for the long-term decline in zooplankton biomass in the upwelling region of the Gulf of Guinea.

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