Diversity and distribution of assemblages of estuarine decapod larvae (Crustacea: Decapoda: Anomura, Brachyura) in tropical southeastern Brazil

Zootaxa ◽  
2011 ◽  
Vol 2758 (1) ◽  
pp. 26 ◽  
Author(s):  
R. A. MAGRIS ◽  
L. F. LOUREIRO FERNANDES
Keyword(s):  
Spatial Heterogeneity ◽  
Relative Abundance ◽  
Southeastern Brazil ◽  
Spatial Gradient ◽  
Estuarine System ◽  
Ecological Stability ◽  
Tropical Estuaries ◽  
Key Factor ◽  
Decapod Larvae

Decapod larvae assemblages were studied in the tropical estuaries off southeastern Brazil (Piraquê-açú and Piraquê-mirim rivers estuaries). A total of 32 taxa of decapod larvae were recorded. Brachyuran larvae dominated in Piraquê-açú estuary, with 62% of the relative abundance, and 49% in Piraquê-mirim estuary. Mean larvae concentrations ranged from 17.2 m -3 at Piraquê-mirim (August 2003) to 221.1 m -3 at Piraquê-açú (April 2003). The assemblage of larvae in both estuaries was diverse, especially at Piraquê-mirim, which showed higher ecological stability. The high spatial heterogeneity of the Piraquê-açú and Piraquê-mirim estuarine system resulted in the division of the assemblage into two well-defined groups (truly estuarine and euryhaline). Salinity spatial gradient was a key factor in the structure and distribution of larvae.

Abundance Estimates of Guiana Dolphins (Sotalia guianensis; Van Bénéden, 1864) Inhabiting an Estuarine System in Southeastern Brazil

2019 ◽  
Vol 45 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Aline B. de Mello ◽  
Julia M. B. Molina ◽  
Maja Kajin ◽  
Marcos C. de O. Santos
Keyword(s):  
Southeastern Brazil ◽  
Estuarine System ◽  
Sotalia Guianensis ◽  
Abundance Estimates

Dinocysts as a Tool for Palaeoenvironmental Reconstruction in Vitória Bay, Brazil

Radiocarbon ◽  
2020 ◽  
Vol 62 (2) ◽  
pp. 289-311
Author(s):  
Alex da Silva de Freitas ◽  
Javier Helenes Escamilla ◽  
Cintia Ferreira Barreto ◽  
Alex Cardoso Bastos ◽  
Estefan Monteiro da Fonseca ◽  
...  
Keyword(s):  
Sea Level ◽  
Saline Water ◽  
Sediment Cores ◽  
Isotopic Analysis ◽  
Southeastern Brazil ◽  
Geochemical Data ◽  
Estuarine System ◽  
Marine Transgression ◽  
The Holocene ◽  
Energy Environment

ABSTRACTMicropaleontological and geochemical data were applied to sediments from southeastern Brazil to study the hydrodynamics associated with the Holocene sea level rise. Sediment cores were taken around Vitória Bay, examined for dinoflagellate cysts and subjected to isotopic analysis. The cyst assemblage mainly dominated by autotrophic species most notably O. centrocarpum, L. machaerophorum and T. vancampoae. The influence of the marine transgression and subsequent regression observed during the Holocene along the coast of Brazil could have initially favored the establishment of an oligotrophic and higher energy environment. The inflow of continental water from tributaries combined with a higher inflow of saline water into the estuarine system could have favored the establishment and subsequent deposition of the dinocysts.

Mechanical Analysis of Functionally Graded Porous Structures: A Review

2020 ◽  
Vol 20 (13) ◽  
pp. 2041015
Author(s):  
Helong Wu ◽  
Jie Yang ◽  
Sritawat Kitipornchai
Keyword(s):  
Porous Materials ◽  
Material Properties ◽  
Mechanical Analysis ◽  
Functionally Graded ◽  
Future Research ◽  
Spatial Gradient ◽  
Porous Structures ◽  
Research Activities ◽  
Key Factor ◽  
New Generation

Functionally graded porous structures (FGPSs), characterized by a continuous spatial gradient in both porosity and material properties, have been considered as the new generation lightweight structures. Research activities on FGPSs have grown rapidly in recent years. This paper is devoted to review the existing research works on FGPSs and to highlight the important advances in this emerging area. It consists of: (i) a brief introduction of porous materials and Functionally graded porous materials (FGPMs); (ii) an elaboration of the key factor and micromechanical models related to material properties of FGPMs; (iii) a comprehensive review of mechanical analysis of FGPSs; (iv) a detailed discussion of the main challenges and future research directions; (v) a conclusion.

Key-factor analysis of immature stages of Aedes scapularis (Diptera: Culicidae) populations in southeastern Brazil

2002 ◽  
Vol 92 (4) ◽  
pp. 271-277 ◽  
Author(s):  
C. Casanova ◽  
A.P. do Prado
Keyword(s):  
Larval Instar ◽  
Southeastern Brazil ◽  
Population Fluctuations ◽  
Mortality Factors ◽  
Breeding Sites ◽  
Final Population ◽  
Key Factor ◽  
Synchronous Development ◽  
Population Sizes ◽  
Key Factor Analysis

AbstractDevelopment times and mortality factors were investigated for populations of Aedes scapularis (Rondani) occurring in natural temporary ground pools in southeastern Brazil. Analysis of life tables by the key-factor method showed that mortality caused by desiccation of breeding sites was the principal factor accounting for fluctuations in population sizes throughout the study period. For cohorts that completed development, mortality attributed to predation by aquatic insects ranged from 68 to 96% and was the most important cause of death. In these cohorts, final population size was determined by the high mortality rates that occurred during the fourth larval instar and pupal stages; however, the key-factor best accounting for the population fluctuations was predation of fourth instar larvae. The short mean time of 7.1 days for synchronous development of the larvae and the lack of evidence of density-dependent mortality suggested that the A. scapularis populations were not strongly regulated and can attain relatively high densities.

scholarly journals Invertebrate and fish environmental preferences as the key factor for lowland riverbed biodiversity

2008 ◽  
Vol 40 (1) ◽  
pp. 125-130
Author(s):  
Paweł Oglęcki
Keyword(s):  
River Regulation ◽  
Ecological Stability ◽  
Environmental Preferences ◽  
Lowland Rivers ◽  
Biological Surveys ◽  
Key Factor

Invertebrate and fish environmental preferences as the key factor for lowland riverbed biodiversity Invertebrate and fish environmental preferences as the key factor for lowland riverbed biodiversity. Detailed biological surveys were carried out on four small and medium lowland rivers (regulated and close-to-nature ones). The typical, repeatable types of microhabitats of peculiar parameters were singled out and the relationships between the microhabitat types and animal taxa were studied. The paper presents the results of such analyses and points out the fact that some microhabitats (irrespective of the fact of river regulation or not) are especially important for the riverbed biodiversity and ecological stability.

scholarly journals Seasonal chaetognath abundance and distribution in a tropical estuary (Southeastern, Brazil)

2005 ◽  
Vol 53 (1-2) ◽  
pp. 47-53 ◽  
Author(s):  
Luiz Loureiro Fernandes ◽  
José Mauro Sterza ◽  
Keyla de Oliveira Neves
Keyword(s):  
Dominant Species ◽  
High Salinity ◽  
Tidal Effect ◽  
Southeastern Brazil ◽  
Estuarine System ◽  
Tropical Estuary ◽  
Freshwater Input ◽  
Wet Season ◽  
Outer Estuary ◽  
Abundance And Distribution

This study focuses on the seasonal variation of the chaetognath species in the Vitória Bay/Passage Channel estuarine system, Espírito Santo, Brazil, in terms of their abundance and distribution. Specimens of chaetognaths were collected between July 1997 and April 1998 at 10 sampling stations, with a cylindrical-conical plankton net of 200 µm mesh and 30 cm mouth, fitted with a mechanical flowmeter. Five chaetognath species were identified: Sagitta enflata, Sagitta decipiens, Sagitta hispida, Sagitta friderici and Sagitta minima. Most of them were distributed in areas of high salinity (e.g. at the stations closest to the outer estuary). The dominant species, S. enflata and S. friderici, were more frequent in the outer estuary where salinities varied from 32 (wet season - summer) to 28 (dry season - winter). S. friderici was the only species found right in the middle of the Passage Channel, at a station close to the main freshwater input into the estuary. Results showed that chaetognaths only enter the estuary due to the tidal effect, and that they are not typical residents of this system. This is to be expected because the group normally inhabits only truly marine regions.

Ecosystem-level carbon stocks and sequestration rates in mangroves in the Cananéia-Iguape lagoon estuarine system, southeastern Brazil

2021 ◽  
Vol 479 ◽  
pp. 118553
Author(s):  
Andre S. Rovai ◽  
Clemente Coelho-Jr ◽  
Renato de Almeida ◽  
Marília Cunha-Lignon ◽  
Ricardo P. Menghini ◽  
...  
Keyword(s):  
Carbon Stocks ◽  
Southeastern Brazil ◽  
Estuarine System ◽  
Ecosystem Level

scholarly journals Spatial And Temporal Distribution Patterns Of Larval Sciaenids In The Estuarine System And Adjacent Continental Shelf Off Santos, Southeastern Brazil

2014 ◽  
Vol 62 (2) ◽  
pp. 149-164 ◽  
Author(s):  
Renata Roque Porcaro ◽  
Maria de Lourdes Zani-Teixeira ◽  
Mario Katsuragawa ◽  
Cláudia Namiki ◽  
Márcio Hidekazu Ohkawara ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Abiotic Factors ◽  
Temporal Distribution ◽  
Distribution Patterns ◽  
Southeastern Brazil ◽  
Estuarine System ◽  
Frequency Of Occurrence ◽  
Reproductive Process ◽  
Average Abundance ◽  
Estuarine Region

Based on data collected during the project "The influence of the Santos-São Vicente estuarine system on the ecosystem of the adjacent continental shelf" (ECOSAN), from Nov/2004 to Mar/2006, the space-temporal distribution pattern of Sciaenidae larvae in relation to biotic and abiotic factors was investigated. Bongo net was used for sampling, aboard the R/V "Prof. W. Besnard" on the shelf, and the boats "Veliger II" and "Albacora" in the estuarine region. Twelve taxa were identified: Bairdiella ronchus, Ctenosciaena gracilicirrhus, Cynoscion spp., Isopisthus parvipinnis, Macrodon atricauda, Micropogonias furnieri, Menticirrhus spp., Nebris microps, Ophioscion punctatissimus, Paralonchurus brasiliensis, Stellifer rastrifer and Stellifer spp. Sciaenidae larvae were widespread on the continental shelf in both campaigns (frequency of occurrence >80%). They were most abundant in Mar/2006 (mean = 6.47 larvae.m-2; sd = 8.36) and least abundant in Sep/2005 (mean = 2.37 larvae.m-2; sd = 3.33). The average abundance in the estuarine region ranged from 0.12 larvae.m-2 (sd = 0.11) in Jun/2005 to 4.28 larvae.m-2 (sd = 1.99) in Nov/2004. Frequency of occurrence minimum occurred in Aug/2005 (50%) and the maximum in Nov/2004 (100%). The presence of Sciaenidae larvae in most locations and periods suggests that the reproductive process of this family in the region is continuous, spawning being more intense in the warmer months.

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