scholarly journals Environmental factors modulating the bathymetric distribution of the demographic groups of Achelous spinimanus (Crustacea)

2019 ◽  
Vol 14 (1) ◽  
pp. 13-28 ◽  
Author(s):  
Camila H. Bernardo ◽  
Veronica Pereira Bernardes ◽  
Aline Nonato de Sousa ◽  
Gabriel Fellipe Barros Rodrigues ◽  
Thiago Elias da Silva ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Temporal Distribution ◽  
Southeastern Brazil ◽  
Adult Males ◽  
Bathymetric Distribution ◽  
Demographic Groups ◽  
Different Depths ◽  
Males And Females ◽  
Spatio Temporal ◽  
Very High

The spatio-temporal distribution of Achelous spinimanus demographic groups (juveniles, and adult males and females) and its relation with environmental factors was analyzed in the region of Ubatuba, southeastern Brazil. We performed the samplings from January to December 2000, at eight sites of different depths. A total of 402 specimens of A. spinimanus was captured. The lowest abundance of all demographic groups occurred in summer, while in winter and spring the abundance of adults was very high. Spatially, juveniles were found at 5 to 35m of depth, while adults at 15 to 40m, but were more abundant at 25m. The low abundance of all demographic groups during summer is probably due to the arrival of the South Atlantic Central Water in the region, which decreased the water temperature and salinity. These changes caused the migration of A. spinimanus to more sheltered places of the bay, possibly due to more favorable environmental conditions. The high abundance of the demographic groups at 25m of depth was due to its more heterogeneous sediment, and to avoid competition with other species more abundant in shallower areas. Therefore, the factors that modulate the distribution of A. spinimanus may differ depending on the ontogenetic phase.

scholarly journals Influence of environmental factors on the bathymetric distribution of the flecked box crab Hepatus pudibundus (Herbst, 1785) (Crustacea: Aethroidea) in the Southeastern Brazilian coast

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Veronica Pereira Bernardes ◽  
Fernando Luis Mantelatto ◽  
Thiago Elias da Silva ◽  
Aline Nonato de Sousa ◽  
Camila Hipólito Bernardo ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Food Availability ◽  
Organic Matter Content ◽  
Temporal Distribution ◽  
Predatory Behavior ◽  
Matter Content ◽  
Southeastern Brazil ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Spatio Temporal

Abstract: This study evaluated the relationships between environmental factors and the spatio-temporal distribution of H. pudibundus, with the hypothesis of differential occupation in coastal areas of southeastern Brazil. The samplings took place monthly in January-December 2000 period, along nine transects from 2 to 40 m of depth, in Ubatuba region, northern coast of São Paulo. We collected 1808 individuals of H. pudibundus. The highest abundance was recorded in winter in the transects 10-25 m deep. Abundance was positively correlated with organic matter content and texture sediment (phi values). With the retreat of the South Atlantic Central Water (SACW) in autumn and winter, the sediment swirls, suspending the detritivore and filter-feeding macrofauna, increasing the food availability. Sites characterized by finer sediment offer higher food availability, besides facilitating H. pudibundus burying behavior. Due to its opportunistic predatory behavior, this species feeds on a variety of organisms, including mollusks, annelids and foraminifera, which are preys more abundant in the studied area and in sediments of finer grain size.

scholarly journals A daytime climatological distribution of high opaque ice cloud classes over the Indian summer monsoon region observed from 25-year AVHRR data

2009 ◽  
Vol 9 (12) ◽  
pp. 4185-4196 ◽  
Author(s):  
A. Devasthale ◽  
H. Grassl
Keyword(s):  
Summer Monsoon ◽  
Indian Subcontinent ◽  
Deep Convection ◽  
Temporal Distribution ◽  
Radiative Balance ◽  
Ice Cloud ◽  
Brightness Temperatures ◽  
Spatio Temporal ◽  
Very High ◽  
Summer Monsoon Region

Abstract. A daytime climatological spatio-temporal distribution of high opaque ice cloud (HOIC) classes over the Indian subcontinent (0–40° N, 60° E–100° E) is presented using 25-year data from the Advanced Very High Resolution Radiometers (AVHRRs) for the summer monsoon months. The HOICs are important for regional radiative balance, precipitation and troposphere-stratosphere exchange. In this study, HOICs are sub-divided into three classes based on their cloud top brightness temperatures (BT). Class I represents very deep convection (BT<220 K). Class II represents deep convection (220 K

scholarly journals Bycatch: complementary information for understanding fish behaviour. Namibian Cape hake (M. capensis and M. paradoxus) as a case study

2006 ◽  
Vol 63 (8) ◽  
pp. 1513-1519 ◽  
Author(s):  
Ana Gordoa ◽  
Heinrich Lesch ◽  
Silvia Rodergas
Keyword(s):  
Negative Relationship ◽  
Temporal Distribution ◽  
Horse Mackerel ◽  
Sample Data ◽  
Strong Negative Relationship ◽  
Different Depths ◽  
Spatio Temporal ◽  
Catch Rates ◽  
Informative Component

Abstract To identify spatio-temporal distribution in Namibian Cape hake (M. paradoxus and M. capensis), incidental hake catch by the horse mackerel fleet and targeted catch by the hake fleet were analysed for the period 1999–2004. The targeted catch, 45 955 fishing days, came from hake fishery logbooks and the incidental catch, 24 689 trawls, from observers' sample data collected aboard vessels of the horse mackerel fleet. A strong negative relationship between monthly catch rates (cpue) and bycatch was observed, confirming that the seasonal change in catchability is caused by differences in hake vertical dispersion. The October trends were an exception: both cpue and bycatch were negative. A drop in catchability at different depths of the fishing grounds indicates that M. capensis migrates to shallower water (<200 m) at the peak of spawning. Although there was no significant relationship between annual catch rates and bycatch, probably because of the short length of the time-series, annual bycatch should not be discarded as an indicator of hake recruitment. The results highlight the potential informative component of bycatch in identifying population patterns that cannot be extracted from the targeted catch.

scholarly journals Spatio-temporal distribution of phytoplankton and environmental factors in the north part of Lake Gehu(Jiangsu) after muti-treatment

2015 ◽  
Vol 27 (4) ◽  
pp. 649-656
Author(s):  
GAO Ya ◽  
◽  
PAN Jizheng ◽  
LI Yong ◽  
HE Shangwei ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Temporal Distribution ◽  
The North ◽  
North Part ◽  
Spatio Temporal

scholarly journals Spatial and temporal distribution of stream macroalgae in a tropical river basin

2015 ◽  
Vol 15 (4) ◽  
Author(s):  
Aurélio Fajar Tonetto ◽  
Cleto Kaveski Peres ◽  
Rafael Taminato Hirata ◽  
Ciro Cesar Zanini Branco
Keyword(s):  
Environmental Factors ◽  
Light Availability ◽  
Temporal Distribution ◽  
Southeastern Brazil ◽  
Spatial And Temporal Variation ◽  
Major Influence ◽  
Spatial And Temporal Distribution ◽  
Tropical River ◽  
Stream Macroalgae ◽  
One Year

Spatial and temporal distribution of stream macroalgae in streams from southeastern Brazil were assessed for one year. The fluctuations in macroalgal species composition and environmental factors were monitored monthly. The region exhibit a tropical climate, with defined rainy and dry seasons. Nineteen species were found, with a predominance of Chlorophyta (52.7% of the species), followed by Cyanobacteria (26.3%), Ochrophyta and Rhodophyta (10.5% each). Scytonema arcangeli had the highest number of records (63.6%), while Mougeotia capucina occurred in all sampling sites. Community structure had low similarity (20-26%) and the environmental factors showed a weak contribution to the distribution pattern observed. Despite this, the light availability at the stream-bed seems to be a major influence on the macroalgal seasonal dynamics. We suggest that macroalgae communities are predominantly composed of rare species, and this could explain the lack of a clear spatial and temporal variation pattern of these organisms.

Spatio-temporal Distribution of Meningitis in HIV Patients in Northern Egypt (2000-2018)

2020 ◽  
Vol 18 (6) ◽  
pp. 405-414
Author(s):  
Ekram W. Abd El-Wahab ◽  
Yamen Hegazy ◽  
Talaat Farrag ◽  
Mohammed Metwally
Keyword(s):  
Rural Areas ◽  
Clinical Stage ◽  
Tertiary Care ◽  
Temporal Distribution ◽  
Fever Hospital ◽  
Adult Males ◽  
Hiv Patients ◽  
Focal Neurological Deficit ◽  
Northern Egypt ◽  
Spatio Temporal

Background: Meningitis is a leading cause of death among patients living with HIV. There is no adequate tracking of the disease occurrence, distribution and etiologic agents among this risk group in Egypt, although the pattern could differ than that of the general population. Objectives: We aimed to describe the spatio-temporal distribution of meningitis in HIV patients in a region of Northern Egypt over an 18-years period (2000-2018). Methods: We conducted a retrospective study of 352 adults HIV patients admitted to a tertiary care fever hospital with neurological manifestations suggesting meningitis. We retrieved from inpatient records all data relevant to patient demographics, clinical presentation, diagnostic work-up, results of laboratory investigations (CSF, blood, imaging), definitive diagnosis, and in-hospital mortality. Results: The overall trend over 2 decades showed fluctuating incidence of meningitis in HIV infected patients and increasingly spread into rural areas, with a uniform circulation among adult males. Cryptococcal meningitis was the most common etiologic agent (26.9%) and was associated with worse outcomes. Focal neurological deficit (38.5%), cranial nerve involvement (48.1%) were common features in TB Meningitis. The mortality was high (56.8%) and was significantly associate with low CD4+ count, advanced AIDs clinical stage and the presence of co-morbidities. Conclusion: Despite the availability of cART, meningitis particularly cryptococcal is common in HIV/AIDS population in Egypt. Continued efforts are desperately needed to improve outcomes of HIV-infected patients.

scholarly journals Environmental factors influencing the spatio-temporal distribution of Carybdea marsupialis (Lineo, 1978, Cubozoa) in South-Western Mediterranean coasts

PLoS ONE ◽  
2017 ◽  
Vol 12 (7) ◽  
pp. e0181611 ◽  
Author(s):  
Antonio Canepa ◽  
Verónica Fuentes ◽  
Mar Bosch-Belmar ◽  
Melissa Acevedo ◽  
Kilian Toledo-Guedes ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Temporal Distribution ◽  
Western Mediterranean ◽  
Factors Influencing ◽  
Spatio Temporal ◽  
Carybdea Marsupialis
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