Abundance dynamics and functional role of predaceous Leptodora kindtii in the Curonian Lagoon

2012 ◽  
Vol 7 (1) ◽  
pp. 91-100
Author(s):  
Jūratė Lesutienė ◽  
Anna Semenova ◽  
Evelina Grinienė ◽  
Zita Gasiūnaitė ◽  
Viktorija Savickytė ◽  
...  
Keyword(s):  
Active Sites ◽  
Small Body ◽  
Zooplankton Community ◽  
Fish Predation ◽  
Curonian Lagoon ◽  
Daily Consumption ◽  
Leptodora Kindtii ◽  
Population Peak ◽  
Estuarine Lagoon ◽  
Peak Abundance

AbstractThe abundance and distribution of predatory cladoceran Leptodora kindtii was investigated in the estuarine lagoon (Curonian Lagoon, SE Baltic Sea). Three hydrodynamically different parts of the lagoon were selected, representing transitory oligohaline, intermediate freshwater and stagnant freshwater sites. L. kindtii was least abundant at the oligohaline site, never occurring at salinities greater than 4 psu. At the two freshwater sites, the abundance of L. kindtii varied from a low of <0.1 up to 2.2 indv. L−1 during peak abundance. Two peaks of L. kindtii abundance were observed with timing differences between stations: at the stagnant site the population of L. kindtii peaked two weeks earlier relative to the more hydrodynamically active sites, likely due to a 2°C higher May temperature. The small body size of L. kindtii in the lagoon (seasonal mean 2.68±0.6 mm) shows high fish predation pressure and predicts small cladocerans, juvenile copepods and rotifers being in the preferred prey size range. The calculated L. kindtii daily consumption during the population peak was as high as 100% of the daily zooplankton production, which implies high potential of this predator to shape the grazing zooplankton community in the lagoon.

Fish predation effects on body length of planktonic cladocerans and copepods in Chilean lakes

Crustaceana ◽  
2015 ◽  
Vol 88 (10-11) ◽  
pp. 1193-1199 ◽  
Author(s):  
Patricio De los Ríos-Escalante
Keyword(s):  
Body Length ◽  
Zooplankton Community ◽  
Fish Predation ◽  
Total Body Length ◽  
Calanoid Copepods ◽  
Main Prey ◽  
Species Numbers ◽  
Zooplankton Size ◽  
Predation Effects ◽  
Total Body

The zooplankton assemblages in Chilean lakes are characterized by their markedly low species numbers and dominance of calanoid copepods. Nevertheless, the effects of zooplanktivorous fish predation on zooplankton size in these communities have not yet been studied in detail. The aim of the present study was to analyse the total length in the main groups of zooplanktonic crustaceans in Chilean lakes: Copepoda: Calanoida, and Cladocera: Daphniidae, as well as “small cladocerans” (specifically the families Bosminidae and Chydoridae). The results revealed that in the presence of fish, total body length decreased significantly for calanoid copepods, whereas for other groups that presence has no significant effect. In sites with fishes, daphniids are significantly larger in comparison with the other groups of the zooplankton community, whereas in sites without fishes calanoids are significant larger in comparison with those other groups. These results would indicate that calanoids would be the main prey for zooplanktivorous fishes in Chilean lakes. Similar results have been reported for Argentinean Patagonian lakes.

scholarly journals Environmental changes and zooplankton temporal and spatial variation in a disturbed brazilian coastal lagoon

2007 ◽  
Vol 67 (2) ◽  
pp. 251-262 ◽  
Author(s):  
CWC. Branco ◽  
B. Kozlowsky-Suzuki ◽  
FA. Esteves
Keyword(s):  
Spatial Variation ◽  
Coastal Lagoon ◽  
Environmental Changes ◽  
Zooplankton Community ◽  
Fish Predation ◽  
Residential Areas ◽  
Temporal And Spatial Variation ◽  
Total Organic Nitrogen ◽  
Temporal And Spatial ◽  
Sand Bar

The Imboassica lagoon, located in the Municipality of Macaé (RJ), is separated from the sea by a sand bar, and its surroundings are partially occupied by residential areas. This coastal lagoon has undergone environmental degradation due to sewage input and artificial sand bar openings. The temporal and spatial variation of environmental variables and zooplankton were studied monthly for four years. There were five artificial openings of the sand bar during the period of study, mostly in the rainy season. Besides osmotic changes, these events caused the drainage of the water of the lagoon into the sea, loss of total organic nitrogen, and an increase of total phosphorus. The zooplankton community of Imboassica lagoon included freshwater and marine taxa, holoplanktonic, meroplanktonic and nectobenthonic forms. Polychaeta, Bivalvia and Gastropoda larvae, and the taxa of Rotifera Hexarthra spp., Lecane bulla, Synchaeta bicornis, nauplii of Cyclopoida and Calanoida copepods were considered constant taxa. Distinct zooplankton assemblages were found during zooplankton spatial surveys in oligohaline and mesohaline conditions. The successful zooplankton populations were either favored by the disturbance of the sand bar opening, such as the veligers of the gastropod Heleobia australis, or capable of fast recovery after the closing of the sand bar, during the succession from a marine into an oligohaline environment, such as Hexarthra spp.. Such populations seemed well adapted to the stress conditions usually found in the lagoon due to osmotic changes, column mixing, nutrient input, and high fish predation pressure. Rare species in the community, such as Moina minuta, presented population increases all over the lagoon under oligohaline conditions.

scholarly journals Recruitment dynamics of the Gulf of Riga herring stock: density-dependent and environmental effects

2010 ◽  
Vol 67 (9) ◽  
pp. 1914-1920 ◽  
Author(s):  
Tiit Raid ◽  
Georgs Kornilovs ◽  
Ain Lankov ◽  
Anne-Marin Nisumaa ◽  
Heli Shpilev ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Egg Production ◽  
Age Groups ◽  
Zooplankton Community ◽  
Density Dependent ◽  
Current Period ◽  
Open Sea ◽  
Gulf Of Riga ◽  
The Baltic ◽  
Peak Abundance

Abstract Raid, T., Kornilovs, G., Lankov, A., Nisumaa, A-M., Shpilev, H., and Järvik, A. 2010. Recruitment dynamics of the Gulf of Riga herring stock: density-dependent and environmental effects. – ICES Journal of Marine Science, 67: 1914–1920. The Gulf of Riga and open-sea stocks of the Baltic herring have displayed remarkably consistent inverse recruitment and stock development patterns since the 1970s: the open-sea stocks steadily declined, whereas the Gulf stock increased rapidly in the early 1990s, reaching a peak abundance in the early 2000s and exceeding the level of the 1970s by a factor of 2–3. The increase was accompanied by a decline in the mean weight-at-age and the condition factor. The estimated decline (by 30–40%) in the average annual consumption rate per individual and changes observed in the zooplankton community suggest that density-dependent effects may have increased since the 1970s. The current period of high stock sizes is also characterized by greater recruitment variability. Historical fecundity investigations have established that the average egg production per individual has decreased in all age groups by 20–50%, along with a decrease in mean weight and condition. Yet, the effect on recruitment has been low so far, because lower fecundity has been compensated by the greater abundance and population fecundity has been maintained at the original level. Recruitment appears to be more influenced by environmental conditions than by spawning-stock biomass.

scholarly journals Impact of juvenile cyprinid fish predation on the food availability and zooplankton community

1991 ◽  
Vol 24 (4) ◽  
pp. 2519-2522
Author(s):  
István Tátrai ◽  
Judit Padisák ◽  
Simonian Aschot
Keyword(s):  
Food Availability ◽  
Zooplankton Community ◽  
Fish Predation ◽  
Cyprinid Fish

scholarly journals Calanoid copepods in central Chilean and Chilean Patagonian lakes (33-55°S, Chile), probable ecological key role in pelagic environments

Crustaceana ◽  
2017 ◽  
Vol 90 (14) ◽  
pp. 1793-1802
Author(s):  
Patricio R. De los Ríos Escalante ◽  
Fatima Kies
Keyword(s):  
Trophic Status ◽  
Zooplankton Community ◽  
Fish Predation ◽  
Crustacean Zooplankton ◽  
Calanoid Copepods ◽  
Number Of Species ◽  
Group Data ◽  
Patagonian Lakes ◽  
Freshwater Bodies ◽  
Ecological Importance

The Patagonian lakes (38-55°S) are characterized by their marked oligotrophy, low number of species of crustacean zooplankton, and a marked predominance of calanoid copepods. Within this context, we considered that a review about the ecology of the zooplankton in central and southern Chilean lakes would be useful, aiming to understand the ecological importance of this group. Data obtained from the literature for freshwater bodies in central and southern Chilean lakes were analysed. In addition, data from various bays with widely differing trophic status in Llanquihue Lake were examined. The results revealed the existence of originally pristine and oligotrophic sites, all with a low number of species and marked calanoid dominance. However, in northern Patagonia there are many lakes in which human intervention has caused an increase in phytoplankton activity, with a consequent replacement of calanoid copepods by daphniid cladocerans. Other important factors that could affect the zooplankton community would be fish predation, which is due to generate a decrease in large-bodied groups of zooplankton; and stress due to exposure to natural ultraviolet radiation. Ecological, biogeographical, and evolutionary topics are discussed within the framework described.

How much can the occurrence and coverage of charophytes in an estuarine lagoon (Curonian Lagoon) be explained by environmental factors?

2019 ◽  
Vol 216 ◽  
pp. 128-138 ◽  
Author(s):  
Martynas Bučas ◽  
Zofija Sinkevičienė ◽  
Marija Kataržytė ◽  
Diana Vaičiūtė ◽  
Jolita Petkuvienė ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Curonian Lagoon ◽  
Estuarine Lagoon

Zooplankton Community and Species Responses to a Natural Turbidity Gradient in Lake Temiskaming, Ontario–Quebec

1986 ◽  
Vol 43 (3) ◽  
pp. 665-673 ◽  
Author(s):  
Erik R. Zettler ◽  
John C. H. Carter
Keyword(s):  
Zooplankton Community ◽  
Daphnia Galeata ◽  
Mysis Relicta ◽  
Leptodora Kindtii ◽  
Turbid Waters ◽  
Fish Predators ◽  
Vertical Distributions ◽  
Crustacean Plankton ◽  
Daphnia Galeata Mendotae ◽  
Plankton Community Structure

Lake Temiskaming, a long, narrow lake between Ontario and Quebec, contains a permanent turbidity gradient, although seasonal turbidity values continually change throughout. Polar ordination indicated that the crustacean plankton community structure was closely related to the first (turbidity) axis. Mean body size was also positively related to turbidity, suggesting that reduced transparency in turbid waters might protect large zooplankters from visually seeking fish predators. Mysis relicta and Leptodora kindtii, the two largest species, were most abundant at the lake's turbid (northern) end with declining numbers toward the clear (southern) end. Many smaller copepods and cladocerans showed reduced numbers at the northern stations during the turbidity maximum in early June, possibly because of impaired feeding ability, after which they progressively increased through the season relative to numbers in the south. Daphnia galeata mendotae failed to show this seasonal increase at the turbid end, possibly because of selective cropping by Mysis and Leptodora. Many species displayed somewhat higher midday vertical distributions in turbid than in clear waters.

scholarly journals Changes in Planktivory and Herbivory Regimes in a Shallow South American Lake (Lake Blanca Chica, Argentina) Over the Last 250 Years

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 597
Author(s):  
David Carrozzo ◽  
Simona Musazzi ◽  
Andrea Lami ◽  
Francisco E. Córdoba ◽  
María de los Ángeles González Sagrario
Keyword(s):  
Size Structure ◽  
Generalized Additive Models ◽  
Management Strategies ◽  
Zooplankton Community ◽  
Fish Predation ◽  
Additive Models ◽  
Fish Scales ◽  
Pheophorbide A ◽  
Food Web Structure ◽  
Species Dominance

Shallow lakes are vulnerable ecosystems impacted by human activities and climate change. The Cladocera occupy a central role in food webs and are an excellent paleoecological indicator of food web structure and trophic status. We conducted a paleolimnological study in Lake Blanca Chica (Argentina) to detect changes on the planktivory and herbivory regimes over the last 250 years. Generalized additive models were fitted to the time series of fish predation indicators (ephippial abundance and size, mucrone size, fish scales, and the planktivory index) and pheophorbide a concentration. The cladoceran assemblage changed from littoral-benthic to pelagic species dominance and zooplankton switched from large-bodied (Daphnia) to small-bodied grazers (Bosmina) ca. 1900 due to increased predation. The shift in planktivory regime (ca. 1920–1930), indicated by fish scales and the planktivory index, as well as herbivory (ca. 1920–1950), was triggered by eutrophication. Changes in planktivory affected the size structure of Bosmina, reducing its body size. This study describes the baseline for the lake as well as the profound changes in the composition and size structure of the zooplankton community due to increased predation and the shift in the planktivory regime. These findings will provide a reference status for future management strategies of this ecosystem.

Competition between Brachionus calyciflorus and Brachionus angularis (Rotifera) in relation to algal food level and initial population density

2019 ◽  
Vol 55 ◽  
pp. 2
Author(s):  
Kun Zhang ◽  
Quan Wan ◽  
Yi-Long Xi
Keyword(s):  
Zooplankton Community ◽  
Limited Resource ◽  
Brachionus Calyciflorus ◽  
Food Level ◽  
Initial Population ◽  
High Food ◽  
Initial Population Density ◽  
Population Growth Rates ◽  
Peak Abundance ◽  
Brachionus Angularis

Intensive interspecific competition for limited resource often can result in the exclusion of inferior competitors, decrease the species diversity and alter the structure of the zooplankton community. Competitive experiments between Brachionus calyciflorus and Brachionus angularis were conducted at three Scenedesmus densities (0.5 × 106, 1.0 × 106 and 2.0 × 106 cells ml−1) and four initial inoculation densities (numerically, 100% B. calyciflorus, 75% B. calyciflorus and 25% B. angularis, 50% each of the two species, 25% B. calyciflorus and 75% B. angularis, and 100% B. angularis). The results showed that at the low food level, B. angularis outcompeted B. calyciflorus and vice versa at the high food levels. At the intermediate food level, B. angularis was displaced by B. calyciflorus at nearly all the initial inoculation densities except for 75% B. angularis, at which both species coexisted until the termination of the experiment. When grown alone at 0.5 × 106, 1.0 × 106 and 2.0 × 106 cells ml−1 of Scenedesmus, B. calyciflorus reached the peak abundance values of 34 ± 4, 69 ± 5 and 101 ± 9 individuals ml−1 and had population growth rates of 0.608 ± 0.032, 0.654 ± 0.033 and 0.518 ± 0.039 d−1, respectively. The corresponding values for B. angularis were 265 ± 8, 330 ± 30 and 802 ± 87 individuals ml−1 and 0.623 ± 0.020, 0.770 ± 0.036 and 0.871 ± 0.013 d−1. The results suggest that the outcome of competition depends not only on the size of the competing species and food availability but also on their colonizing density.

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