scholarly journals Diel vertical migration and spatial overlap between fish larvae and zooplankton in two tropical lakes, Brazil

2015 ◽  
Vol 75 (2) ◽  
pp. 352-361 ◽  
Author(s):  
PHS. Picapedra ◽  
FA. Lansac-Tôha ◽  
A. Bialetzki

The effect of fish larvae on the diel vertical migration of the zooplankton community was investigated in two tropical lakes, Finado Raimundo and Pintado lakes, Mato Grosso do Sul State, Brazil. Nocturnal and diurnal samplings were conducted in the limnetic region of each lake for 10 consecutive months from April 2008 to January 2009. The zooplankton community presented a wide range of responses to the predation pressure exerted by fish larvae in both environments, while fish larvae showed a typical pattern of normal diel vertical migration. Our results also demonstrated that the diel vertical migration is an important behaviour to avoid predation, since it reduces the spatial overlap between prey and potential predator, thus supporting the hypothesis that vertical migration is a defence mechanism against predation.

2015 ◽  
Vol 105 (2) ◽  
pp. 174-183 ◽  
Author(s):  
Marcos Marques Mendonça ◽  
Pablo Henrique dos Santos Picapedra ◽  
Michelli Caroline Ferronato ◽  
Paulo Vanderlei Sanches

ABSTRACT Based on the hypothesis that diel vertical migration (DVM) is a mechanism of predator avoidance, the objective of the present study was to test for the occurrence of DVM in planktivorous fish larvae of Hypophthalmus edentatus (Spix, 1829) (Siluriformes, Pimelodidae) and Plagioscion squamosissimus (Heckel, 1840) (Perciformes, Sciaenidae), and zooplankton (rotifers, cladocerans and copepods) in an isolated tropical lagoon in the floodplain of the Upper Paraná River, Brazil (region of Parque Nacional de Ilha Grande). We investigated spatial overlap between predators (planktivorous fish larvae) and prey (zooplankton), and tested which physical and chemical variables of the water are related to the DVM of the studied communities. We performed nocturnal (8:00 pm and 4:00 am) and diurnal sampling (8:00 am and 4:00 pm) in the limnetic region of the lagoon for six consecutive months, from October 2010 to March 2011, which comprises the reproductive period of the fish species analyzed. During the day the larvae tried to remain aggregated in the bottom of the lagoon, whereas at night they tried to disperse in the water column. Especially for cladocerans, the diel vertical migration is an important behavior to avoid predation larvae of H. edentatus and P. squamosissimus once decreased spatial overlap between secured and its potential predators, which corroborates the hypothesis that DVM is a mechanism of predator avoidance. Although significant correlations were observed between the abiotic factors and WMD of microcrustaceans at certain times of day, the effect of predation of fish larvae on zooplankton showed more important in this environment, because the small depth and isolation not allow great variation of abiotic factors seasonally and between strata the lagoon.


2003 ◽  
Vol 63 (2) ◽  
pp. 329-343 ◽  
Author(s):  
I. F. Neves ◽  
O. Rocha ◽  
K. F. Roche ◽  
A.A. Pinto

In the present study, two small lakes on the margins of the River Cuiabá were analyzed regarding taxonomic composition and population densities of the zooplankton. Diversity was evaluated for two groups, Rotifera and Cladocera; sampling was carried out on two dates: 2 March 1999, in the rainy season, and 25 August 1999, in the dry season. Seventy-nine rotifer taxa, 30 cladoceran taxa, and 6 copepod taxa were found. Comparing the species identified in the present study with those recorded by other authors for several water bodies in Mato Grosso and Mato Grosso do Sul states, it was found that 9 species of Cladocera, 2 of Copepoda, and 14 of Rotifera are new records for the region. The most abundant rotifer species were Keratella cochlearis, Brachionus angularis, Polyarthra vulgaris, and Keratella americana. Moina minuta and Bosminopsis deitersi were dominant among the cladocerans, and Notodiaptomus transitans and N. devoyorum among the copepods. Comparing both lakes, the greatest species richness of both Rotifera and Cladocera was observed in Lake Souza Lima, during the rainy season. This is probably linked to the fact that the littoral region of this lake is densely colonized by macrophytes. The lake also has better environmental conditions since it does not receive domestic sewage inputs, as does Lake Parque Atalaia. The diversity of the Rotifera was markedly low in Lake Parque Atalaia, during the dry season, again perhaps linked domestic sewage input found in this water body.


2008 ◽  
Vol 33 (4) ◽  
pp. 53-60 ◽  
Author(s):  
I. D. Coutinho ◽  
R. G. Coelho ◽  
V. M. F. Kataoka ◽  
N. K. Honda ◽  
J. R. M. Silva ◽  
...  

Five flavanones and three chalcones were isolated from Campomanesia adamantium Berg. (Myrtaceae) leaves. The contents of these compounds were determined by HPLC. The phenolic contents were also determined. The monitoring of the antioxidant activity was carried out by inhibition of peroxidation using the linoleic acid system and radical-scavenging (DPPH). The plants were collected from 4 distinct cities of the Mato Grosso do Sul State, Brazil. The different samples exhibited a range of 4.67-232.35 mg/g chalcones and 15.62-50.71 mg/g flavanones and phenolic contents of the 7.24-21.19 mg/g gallic acid. All extracts showed high antioxidant activity with a wide range of the radical-scavenging (DPPH) from 52.0 to 92.2 % and inhibition oxidation of linoleic acid from 14.6 to 94.2%.


2013 ◽  
Vol 22 (4) ◽  
pp. 525-531 ◽  
Author(s):  
Keyla Carstens Marques de Sousa ◽  
Marcos Rogério André ◽  
Heitor Miraglia Herrera ◽  
Gisele Braziliano de Andrade ◽  
Marcia Mariza Gomes Jusi ◽  
...  

Tick-borne pathogens affect a wide range of vertebrate hosts. To identify tick-borne pathogens among dogs from Campo Grande, MS, Brazil testing seropositive for Leishmania infantum (syn. L. chagasi), a serological and molecular study was conducted to detectEhrlichia canis, Anaplasma platys and Babesia vogeli in 60 serum and spleen samples. A confirmatory diagnosis ofL. infantum based on serological and molecular assays was also performed, as was sequence alignment and phylogenetic analysis to assess the identity of the parasite species infecting these animals. IgG antibodies toEhrlichia spp., B. vogeli and L. infantum were found, respectively, in 39 (65%), 49 (81.6%) and 60 (100%) of the sampled dogs. Twenty-seven (45%), fifty-four (90%), fifty-three (88.3%), two (3.3%) and one (1.6%) dog were positive, respectively, forE. canis, Leishmania spp., Leishmania donovani complex, Babesia sp. and Anaplasma sp. in PCR assays. After sequencing, the amplicons showed 99% of identity with E. canis, B. vogeli, A. platys andLeishmania chagasi isolates. The findings of this study indicate that L. infantum-seropositive dogs from Campo Grande are exposed to multiple tick-borne pathogens, which should therefore be included in the differential diagnosis of dogs with clinical suspicion of leishmaniasis.


2008 ◽  
Vol 65 (6) ◽  
pp. 1144-1152 ◽  
Author(s):  
Sandra L. Cooke ◽  
Craig E. Williamson ◽  
Dina M. Leech ◽  
Wiebke J. Boeing ◽  
Lisette Torres

In transparent, thermally stratified lakes, ultraviolet radiation (UV) and temperature are among the primary factors influencing diel vertical migration (DVM) of zooplankton. It is not well known how behavioral responses will vary across a wide range of depths with steep gradients in UV, photosynthetically active radiation (PAR), and temperature. Our objective was to determine the relative importance of UV and temperature on DVM of Daphnia catawba and Leptodiaptomus minutus in a high UV, thermally stratified lake. Using UV-transparent (+UV) and UV-opaque (–UV) columns suspended within the mixed layer and metalimnion, we found that both species were generally shallower in the –UV than in the +UV columns. Daphnia catawba responded negatively to UV, even below the 1% depth for 320 nm, whereas L. minutus responded to UV only within the mixed layer and upper metalimnion. Daphnia catawba did not migrate in the –UV in the mixed layer, but migrated upwards in the –UV in the deep part of the metalimnion, indicating a temperature-induced rather than phototactic response. At night, both species migrated upwards in the metalimnion and were evenly distributed in the mixed layer. These results indicate that in transparent lakes, UV may constrain some zooplankton to cooler, suboptimal temperatures, which may compromise fitness.


Polar Biology ◽  
2011 ◽  
Vol 34 (9) ◽  
pp. 1301-1317 ◽  
Author(s):  
Letterio Guglielmo ◽  
Roberta Minutoli ◽  
Alessandro Bergamasco ◽  
Antonia Granata ◽  
Giacomo Zagami ◽  
...  

2005 ◽  
Vol 65 (4) ◽  
pp. 651-659 ◽  
Author(s):  
P. B. Medina-Júnior ◽  
A. C. Rietzler

Limnological studies involving physical, chemical and biological aspects, with emphasis on the zooplankton community, were carried out in a saline lake of the Pantanal floodplain, in the subregion of Nhecolândia (Mato Grosso do Sul, Brazil), during the dry and wet seasons of the local hydrological cycle. The results show that the lake is not directly affected by the flood-pulse through superficial coalescence, probably receiving groundwater instead. Most of the measured variables showed extremely high values, particularly dissolved salts, pH, conductivity, nutrients and chlorophyll a. These values were highest during the dry period due to the system's low water volume. The zooplankton community was basically represented by Metacyclops mendocinus, which displayed high population densities throughout the periods studied. The low diversity recorded is congruent with other studies on continental saline water-bodies.


2019 ◽  
Vol 6 (4) ◽  
pp. 75-78
Author(s):  
Eliamara Marques Silva ◽  
Luciana Cláudia Toscano ◽  
Fábio Steiner ◽  
Wilson Itamar Maruyama

Phytophagous mites belonging to the family Tetranychidae are considered pests of a wide range of plant species of agricultural importance in the Annonaceae family. This study aimed to reports the occurrence and attack symptoms of the mite Tetranychus mexicanus (McGregor) (Acari: Tetranychidae) on soursop seedlings (Anonna muricata L.). High mite infestation on the leaves of soursop seedlings was reported in a seedling production nursery made of black Sombrite® screen with 35% restriction of full daylight, located at the State University of Mato Grosso do Sul (UEMS), in Cassilândia, MS, Brazil, during the month of October 2015. Attack symptoms were on the adaxial side of the leaves, whereas mite colonies were located on the abaxial face of the leaves. The injuries started by yellowing of the leaves and curled edges, and later by the fall of the attacked leaves. This is the first record of the occurrence of T. mexicanus in soursop seedlings produced on agricultural screenhousein the state of Mato Grosso do Sul, Brazil.


2007 ◽  
Vol 7 (1) ◽  
pp. 227-230 ◽  
Author(s):  
William Marcos Silva ◽  
Kennedy Francis Roche

The occurrence of the freshwater jellyfish Craspedacusta sowerbii (=sowerbyi) Lankester, 1880 was recorded in April 2006 in the Lagoa Misteriosa water body, a calcareous lake (doline) in Mato Grosso do Sul State, Brazil. Only Rotifera composed the zooplankton community was composed only of Rotifera and the environment was meso-eutrophic system. The nomenclature of C. sowerbii is discussed with regard to the use of the correct spelling and an alternative one. The distributions of C. sowerbii in Brazil include eight states and in South America the distribution includes four countries.


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