scholarly journals Distribution of the mesozooplankton at continental shelf off Sergipe, Brazil

2008 ◽  
Vol 36 (1-2) ◽  
Author(s):  
Hortência Maria Pereira ARAUJO ◽  
Viviane RIBEIRO
Keyword(s):  
Continental Shelf ◽  
Zooplankton Community ◽  
Mesh Size ◽  
Bottom Layer ◽  
Abundant Species ◽  
Tropical Species ◽  
Dominant Group ◽  
Surface Salinity ◽  
Canonical Ordination ◽  
Coastal Species

The purpose of this work was to study the composition and abundance of the mesozooplankton at two stations at the continental shelf off Sergipe. At each station, oblique plankton tows were carried using plankton nets with 200 µm mesh size, in six hours intervals during three consecutive days. One hundred and three taxa were identified and Copepoda was the dominant group with fifty one species. The mesozooplankton assemblage was composed by coastal, neritic and oceanic tropical species. There were significant differences in composition and abundance between the two studied stations (p<0,05) but not between tidal stages. At station 1, the most abundant species were Creseis acicula, Oikopleura spp., Temora stylifera, Paracalanus quasimodo and Aglaura hemistoma, and at station 2 Paracalanus quasimodo, Paracalanus spp., Siphonophora, Gastropoda and Decapoda larvae. Coastal species such as Parvocalanus crassirostris, Acartia lilljeborgi, Euterpina acutifrons and Corycaeus giesbrechti occurred only at the last station, located close to the mouth of the São Francisco River, where surface salinity and transparency values were low. In this station the salinity average value at surface was 30,8±1,9 and at the bottom layer was 35.0±0.3 PSU. Mesozooplanhton density values ranged between 124 ind.m-3 and 2,658 ind.m-3 at station 1, and from 734 ind.m-3 to 3,061 ind.m-3 at station 2. A Monte Carlo test based on a canonical ordination revelead that local depth and water transparency were significantly correlated to the mesozooplankton distribution. Key words: zooplankton community, Copepoda, shelf off Sergipe, tropical.

scholarly journals Siphonophora from the coast of Brazil (17ºS to 24ºS)

1991 ◽  
Vol 39 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Catarina Ramis Nogueira ◽  
Sérgio dos Reis Oliveira Jr
Keyword(s):  
East Coast ◽  
Coastal Upwelling ◽  
Mesh Size ◽  
Abundant Species ◽  
Factorial Analysis ◽  
The Other ◽  
Trophic Interaction ◽  
Principal Axes ◽  
Bank System

This work is based on the analysis of 99 zooplankton samples collected during the Oceanographic Expedition "ESPÍRITO SANTO I", held along the east coast of Brazil, between Cabo Frio and Abrolhos Archipelago, an area characterized by the occurrence of coastal upwelling, from July to September 1984. Zooplankton was collected with vertical plankton net hauls of 250 µm mesh size in the upper 200 meters layer. A total of twenty one species of Siphonophora was observed, two of which were identified as being physonect and the other as calycophorans. Specific diversity close to the shore and at the neighborhood of the Vitória-Trindade Bank System, showed smaller values, in comparison with those in the oceanic regions. Factorial analysis was used in order to access the changes observed in the population of the eleven most abundant species. The first two principal axes represented the influence of the nearshore - offshore gradient and the role of trophic interaction, accounted for 60% of the total variance of the data.

scholarly journals Composition of Trichiuridae and Gempylidae larvae (Teleostei) and their association with water masses in the Southwest Atlantic Ocean

2009 ◽  
Vol 38 (4) ◽  
Author(s):  
Paulo Júnior ◽  
Christiane de Souza ◽  
Graciela Weiss
Keyword(s):  
Temperature Gradient ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
Mesh Size ◽  
Water Masses ◽  
Southwest Atlantic ◽  
Patos Lagoon ◽  
La Plata ◽  
Tropical Water ◽  
The Relationship

Composition of Trichiuridae and Gempylidae larvae (Teleostei) and their association with water masses in the Southwest Atlantic OceanIn this paper the relationship between temporal changes in the occurrence of water masses and Trichiuridae and Gempylidae larvae composition and distribution in the Southwest Atlantic ocean were analysed between 25° and 40° S. Ichthyoplankton was collected during the three expeditions of the Subtropical Convergence Project: Winter and Spring 1977, Autumn 1978 and Summer 1981, realized in the Southwest Atlantic waters. Oblique tows were conducted using a Hensen net with 250 μm mesh size. Steep salinity and temperature gradient were found, where the river outflows from La Plata river (Argentina) and Patos Lagoon (Brazil) met the Tropical Water over the continental shelf between 32 and 36° S. We examined 524 Hensen-net samples that contained about 283 larvae from five species of Trichiuridae and Gempylidae. The most abundant and frequent specie were

Arthropod community structures of rice ecosystems in the Philippines

1991 ◽  
Vol 81 (4) ◽  
pp. 407-416 ◽  
Author(s):  
K.L. Heong ◽  
G.B. Aquino ◽  
A.T. Barrion
Keyword(s):  
Abundant Species ◽  
Diversity Indices ◽  
Nilaparvata Lugens ◽  
The Philippines ◽  
Arthropod Community ◽  
Dominant Group ◽  
Cropping Patterns ◽  
Cyrtorhinus Lividipennis ◽  
Positive Correlations ◽  
Relative Differences

AbstractThe arthropod community associated with irrigated rice grown in five sites in Luzon Island, Philippines, was analysed using guild categories. Phytophages and predators were predominant in all sites. The phytophage species were mainly Homoptera and dominated by Nephotettix virescens (Distant), N. nigropictus (Stål) (Cicadellidae), and Nilaparvata lugens (Stål) and Sogatella furcifera (Horváth) (Delphacidae). Predators were mainly Heteroptera with Microvelia douglasi atrolineata Bergoth (Veliidae), Mesovelia vittigera (Horváth) (Mesoveliidae), and Cyrtorhinus lividipennis Reuter (Miridae) as the most abundant species. Spiders were the next dominant group with Pardosa pseudoannulata (Böesenberg & Strand) and three species of Tetragnatha the most common. Differences in species diversity between the sites were easily differentiated using diversity indices. The relative differences in arthropod abundance, species richness and diversity may be attributed to the median temperatures, cropping patterns, and diversity in crop stages and germplasm in the sites. Predator-Homoptera correlations were significant in all cases. High positive correlations were obtained for veliids, spiders and Cyrtorhinus lividipennis, in most sites.

scholarly journals Spatial distribution and secondary production of Copepoda in a tropical reservoir: Barra Bonita, SP, Brazil

2007 ◽  
Vol 67 (2) ◽  
pp. 223-233 ◽  
Author(s):  
MJ. Santos-Wisniewski ◽  
O. Rocha
Keyword(s):  
Spatial Distribution ◽  
Secondary Production ◽  
General Pattern ◽  
Winter Season ◽  
Zooplankton Community ◽  
Zooplankton Biomass ◽  
Tropical Lakes ◽  
Numerical Density ◽  
Dominant Group ◽  
Tropical Reservoir

The present paper aims to describe the spatial distribution of zooplankton copepods, their biomass and instantaneous secondary production, in Barra Bonita, a large eutrophic, polymitic reservoir (22° 29' S and 48° 34' W) on the Tietê River, of the Paraná basin. Sampling was carried out during two seasons: dry winter and rainy summer. Species composition, age structure and numerical density of each copepod species population were analyzed at 25 sampling stations. Secondary production was calculated for Copepoda, the dominant group in zooplankton communities, taking Calanoida and Cyclopoida separately. Copepoda represented the largest portion of the total zooplankton biomass, the dominant species being Notodiaptomus iheringi among the Calanoida and Mesocyclops ogunnus and Thermocyclops decipiens among the Cyclopoida. The production of Copepoda was higher during the rainy summer (23.61 mgDW.m-3.d-1 in January 1995) than during the dry winter season (14 mgDW.m-3.d-1 in August 1995), following the general pattern of abundance for the whole zooplankton community. Among the copepods, Cyclopoida production was higher than that of Calanoida, a pattern commonly observed for tropical lakes and reservoirs. Barra Bonita copepods are very productive, but there was a great degree of spatial heterogeneity, related to the physical and chemical conditions, particularly the level of nutrients and also to phytoplankton biomass.

scholarly journals Abiotic parameters and planktonic community of an earthen fish pond with continuous water flow

2019 ◽  
Vol 31 ◽  
Author(s):  
Lúcia Helena Sipaúba-Tavares ◽  
Rodrigo Ney Millan ◽  
Érica Camargo Oliveira Capitano ◽  
Bruno Scardoelli-Truzzi
Keyword(s):  
Water Flow ◽  
Zooplankton Community ◽  
Information Criterion ◽  
Sampling Period ◽  
Plankton Community ◽  
Dominant Group ◽  
Small Water ◽  
Management Protocol ◽  
Thermotolerant Coliforms ◽  
Zooplankton Communities

Abstract Aim Limnological conditions, phytoplankton and zooplankton communities in a fishpond highly affected by management during the dry and rainy seasons are investigated. Methods Water samples were analyzed for physicochemical parameters; soil samples were analyzed for macro- and micro-nutrients, phytoplankton and zooplankton communities, at four sites, during eight months in the rainy and dry seasons. Distance-based linear model (DISTLM) was applied with Akaike Information Criterion (AIC), where the influence of environmental variables in the variation of phytoplankton and zooplankton composition could be assessed and the best model could be selected. Results The multiparameter test revealed that variables pH, TSS and TP better explain the composition of the biotic community (AICc = 45.6; R2 = 0.80). Chlorophyceae was the dominant group with 32 taxa, or rather, 75-85% of total phytoplankton, with high density at 2,365-4,180 ind.L-1 during the sampling period. Rotifera was the most abundant group in the zooplankton community during the two seasons, except at IW2 during the dry season, when Copepoda had a higher density, namely, 52% of total zooplankton community at this site. Conclusions The contribution of allochthonous material to the fishpond during the two seasons mainly consists of macro- and micro-nutrients and thermotolerant coliforms that influenced the plankton community and enhanced high Cyanobacteria density in the rainy season. Plankton community in the studied pond was characteristic of small water bodies. Management protocol in places with continuous water flow according to the region may be an important tool to optimize and to avoid risks in fish production.

How does mesh-size selection reshape the description of zooplankton community structure in coastal lakes?

2014 ◽  
Vol 151 ◽  
pp. 221-235 ◽  
Author(s):  
Marco Pansera ◽  
Antonia Granata ◽  
Letterio Guglielmo ◽  
Roberta Minutoli ◽  
Giacomo Zagami ◽  
...  
Keyword(s):  
Community Structure ◽  
Zooplankton Community ◽  
Mesh Size ◽  
Zooplankton Community Structure ◽  
Coastal Lakes ◽  
Size Selection

The diversity and longitudinal changes of zooplankton in the lower course of a large, regulated European river (the lower Vistula River, Poland)

Biologia ◽  
2013 ◽  
Vol 68 (6) ◽  
Author(s):  
Paweł Napiórkowski ◽  
Teresa Napiórkowska
Keyword(s):  
Species Diversity ◽  
Zooplankton Community ◽  
Abundant Species ◽  
Main Channel ◽  
Brachionus Calyciflorus ◽  
Longitudinal Variation ◽  
Zooplankton Species ◽  
Larval Stages ◽  
Vistula River ◽  
Brachionus Angularis

AbstractThe diversity and longitudinal variation of zooplankton in the lower Vistula River were analyzed. Samples were taken from 40 stations located along a 272-km long section of the lower river course. During the study the unique technique of taking samples from “the same water” was used. The zooplankton community was dominated by rotifers and nauplii — larval stages of copepods. The most abundant species were: Brachionus angularis, Brachionus calyciflorus and Brachionus budapestiensis. The zooplankton species diversity in the main channel of the lower Vistula River was similar to other large European rivers; however, its abundance was lower. The diversity, abundance and biomass of potamoplankton steadily decreased downstream. This could be related both to scarcity of storage zones for potamoplankton development in the river due to the extensive regulation processes, and changes in hydrological conditions of the main channel (by the straightening of riverbed) where the samples were collected.

Distribution of benthic fauna in sediment grains and prop roots of a mangrove channel in south-eastern Brazil

2016 ◽  
Vol 97 (2) ◽  
pp. 377-385 ◽  
Author(s):  
Debora De Souza Silva-Camacho ◽  
Rafaela De S. Gomes ◽  
Joaquim N.S. Santos ◽  
Francisco Gerson Araújo
Keyword(s):  
Benthic Fauna ◽  
Fine Sand ◽  
Abundant Species ◽  
High Abundance ◽  
Dominant Group ◽  
Medium Sand ◽  
Spatial Partitioning ◽  
South Eastern ◽  
Eastern Brazil ◽  
Different Types

We examined the benthic fauna in four areas along a mangrove tidal channel in south-eastern Brazil, between October 2008 and August 2009. The tested hypothesis is that the most abundant groups avoid competition as they occupy different types of substrata and that the longitudinal distance from the sea also affects the occurrence of benthic fauna along the channel. We also examined the prop root epibiont fauna to describe this different community. Polychaeta was the dominant group in the sediment whereas Isopoda and Tanaidacea were the dominant groups on the prop roots. We found a tendency for higher infauna species richness and diversity in the innermost channel area during the summer. Higher abundance of epibiont fauna was also found in summer with tidal movements allowing the colonization of the prop roots of the mangrove forest by some taxa. The polychaetes Ceratocephale sp. and Laeonereis acuta had indication of habitat partitioning, with the first occurring mainly in very fine sand sediment whereas the latter preferred medium sand sediment. The microcrustaceans Chelorchestia darwini and Tanaidacea sp. 1 occurred in high abundance colonizing the prop roots. Exosphaeroma sp. was found in high abundance in infauna and epibiont fauna. The tested hypothesis of spatial partitioning of the mangrove channel by the benthic fauna was confirmed with the most abundant species occupying the substrata with different grain fractions and prop roots in different stations.

scholarly journals Daily variation of zooplankton abundance and evenness in the Rosana reservoir, Brazil: biotic and abiotic inferences

2014 ◽  
Vol 104 (1) ◽  
pp. 21-31 ◽  
Author(s):  
Érica M. Takahashi ◽  
Fábio A. Lansac-Tôha ◽  
Juliana D. Dias ◽  
Claudia C. Bonecker
Keyword(s):  
Resource Availability ◽  
Environmental Conditions ◽  
Daily Variation ◽  
Food Resource ◽  
Zooplankton Community ◽  
Abundant Species ◽  
Zooplankton Abundance ◽  
Temporal Fluctuation ◽  
Abiotic Variables ◽  
Temporal And Spatial

The zooplankton community presents stochastic temporal fluctuation and heterogeneous spatial variation determined by the relationships among the organisms and environmental conditions. We predicted that the temporal and spatial zooplankton distribution is heterogeneous and discrete, respectively, and that the daily variation of most abundant species is related to environmental conditions, specifically the availability of resources. Zooplankton samples were collected daily at three sampling stations in a lateral arm of the Rosana Reservoir (SP/PR). The zooplankton did not present significant differences in abundance and evenness among sampling stations, but the temporal variation of these attributes was significant. Abiotic variables and algal resource availability have significantly explained the daily variation of the most abundant species (p<0.001), however, the species distribution makes inferences on biotic relationships between them. Thus, not only the food resource availability is influential on the abundance of principal zooplankton species, but rather a set of factors (abiotic variables and biotic relationships).

Sign in / Sign up

Export Citation Format

Share Document