Black sand deposits; their spatial distribution and hazards along the northern coast of Sinai Peninsula, Egypt

2020 ◽  
Vol 183 ◽  
pp. 104219
Author(s):  
Akram Aziz ◽  
Rehab Sief ◽  
Baher Ghieth ◽  
Mona Kaiser
Keyword(s):  
Spatial Distribution ◽  
Northern Coast ◽  
Sinai Peninsula ◽  
Black Sand

Temporal and spatial distribution of the commercial shrimp Litopenaeus schmitti (Dendrobranchiata: Penaeidae) in the south-eastern Brazilian coast

2014 ◽  
Vol 94 (5) ◽  
pp. 1001-1008 ◽  
Author(s):  
Gabriel L. Bochini ◽  
Adilson Fransozo ◽  
Antonio L. Castilho ◽  
Gustavo L. Hirose ◽  
Rogerio C. Costa
Keyword(s):  
Spatial Distribution ◽  
Abiotic Factors ◽  
Capture Rate ◽  
Organic Matter Content ◽  
Organic Content ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Temporal And Spatial Distribution ◽  
Temporal And Spatial ◽  
Number Of Individuals

The goal of the present study was to assess the temporal and spatial distribution of L. schmitti in three bays of the northern coast of the State of São Paulo, Ubatumirim (UBM), Ubatuba (UBA) and Mar Virado (MV), over a period of two years (1998 and 1999). Abiotic factors were monitored to test their influence on the distribution of the species through redundancy analysis. The shrimp were captured using a commercial fishing boat equipped with double-rig trawling nets at six sampling points. A total of 5658 individuals were collected during the study (4437 and 1221 in the first and second years, respectively). The number of individuals differed between years, bays, seasons and sampling locations. The highest number of L. schmitti was collected in MV (N = 2747), followed by UBM (N = 1649) and UBA (N = 1262). Shrimp abundance correlated positively with organic matter content, salinity and temperature, with the highest number of individuals collected from sites with intermediate levels of organic content (4 and 6%) and increasing when the sediment had a higher proportion of fine and very fine sand + clay. Abundance was also associated negatively with rainfall, given that the analysed population showed a seasonal pattern, with an increase in capture rate in those months following the rainy season. Average rainfall was 222.47 ± 138.68 mm, with a maximum of 538 mm and a minimum of 22.4 mm. The results obtained in this study suggest that, in the region of Ubatuba, temperature, salinity, organic content and rainfall modulate the distribution of these animals.

scholarly journals Temporal and Spatial Distribution of the Toxic Epiphytic Dinoflagellate Ostreopsis cf. ovata in the Coastal Waters off Jeju Island, Korea

2020 ◽  
Vol 12 (14) ◽  
pp. 5864
Author(s):  
Jaeyeon Park ◽  
Jinik Hwang ◽  
Jun-Ho Hyung ◽  
Eun Young Yoon
Keyword(s):  
Spatial Distribution ◽  
Water Temperature ◽  
Coastal Waters ◽  
Microscopic Analysis ◽  
Jeju Island ◽  
Northern Coast ◽  
Temporal And Spatial Distribution ◽  
Chain Reactions ◽  
Polymerase Chain Reactions ◽  
Temporal And Spatial

The temporal and spatial distribution of the toxic epiphytic dinoflagellate Ostreopsis cf. ovata was investigated off the Jeju coastal waters, Korea, from July 2016 to January 2019. The results showed that the presence of Ostreopsis cf. ovata in 184 macroalgae was 79.3%, and it was more frequently attached to red algae and brown algae than to green algae. The abundance of Ostreopsis cf. ovata as determined by quantitative real-time polymerase chain reactions (qPCR) and microscopic analysis was 4–3204 cells g−1, and the maximum abundance observed in September 2018, when the water temperature was 24.4 °C. The abundance was higher in summer and autumn than in spring and winter. Spatially, high abundance was observed in autumn on the northern coast of Jeju Island and, in summer, in the southern and eastern coastal waters. The water temperature of Jeju coastal waters in winter remained higher than 15 °C, and this species could be overwintering in the Jeju waters. Therefore, further monitoring and research are needed to evaluate the proliferation of Ostreopsis cf. ovata, which contains a novel toxin with unidentified effects on humans.

scholarly journals From Guaratuba to Babitonga: a geologicevolutionary contribution to the study of the spatial distribution of the shell mound builders on the northern coast of Santa Catarina.

2001 ◽  
pp. 55
Author(s):  
Mário Sérgio Celski de Oliveira ◽  
Norberto Olmiro Horn Filho
Keyword(s):  
Spatial Distribution ◽  
Northern Coast ◽  
Santa Catarina

O trabalho apresenta uma abordagem geológico-evolutiva dos sambaquis da planície costeira de Joinville cujos resultados indicam uma possível rota para deslocamento de sambaquianos entre o litoral sul paranaense e o litoral norte catarinense. O modelo paleogeográfico proposto e as datações absolutas de sambaquis atualmente disponíveis convergem para o canal do Palmital como região inicial de ocupação de Joinville por aquelas populações de pescadores-coletores.

scholarly journals Spatial distribution of the amazon river prawn Macrobrachium Amazonicum (Heller, 1862) (Decapoda, Caridea, Palaemonidae) in two perennial creeks of an estuary on the northern coast of Brazil (Guajará Bay, Belém, Pará)

2011 ◽  
Vol 71 (4) ◽  
pp. 925-935 ◽  
Author(s):  
BS. Bentes ◽  
JM. Martinelli ◽  
LS. Souza ◽  
DV. Cavalcante ◽  
MC. Almeida ◽  
...  
Keyword(s):  
Organic Matter ◽  
Spatial Distribution ◽  
Dry Season ◽  
Northern Coast ◽  
Tidal Creeks ◽  
Allochthonous Organic Matter ◽  
Macrobrachium Amazonicum ◽  
Freshwater Crustacean ◽  
Northern Brazil ◽  
River Communities

Macrobrachium amazonicum is the most frequently consumed freshwater crustacean by river communities of the Amazon. Despite its relative abundance and vast knowledge on the species from data on cultivated specimens, little is known regarding its biology in the natural environment, especially its use of creeks that are strongly influenced by the tide. Specimens of Macrobrachium amazonicum were collected in September 2006 (dry season) and March 2007 (rainy season) from two perennial creeks of the Guajará Bay in the state of Pará (northern Brazil), using traps similar to the matapis used by local fishermen to identify the spatial distribution of the species. Shrimps of all sizes use the tidal creeks in both seasons, including for breeding purposes. The greatest abundance of the species occurred in headwater areas and in the dry season. It is suggested that abundant allochthonous organic matter and the preference for protected areas may explain the abundance and breeding activity of this species in the headwaters of the creeks.

Spatial distribution and habitat selection of Barrow’s and Common goldeneyes wintering in the St. Lawrence marine system

2010 ◽  
Vol 88 (3) ◽  
pp. 306-314 ◽  
Author(s):  
Jean-François Ouellet ◽  
M. Guillemette ◽  
M. Robert
Keyword(s):  
Spatial Distribution ◽  
Large Scale ◽  
Distribution Patterns ◽  
Physical Factors ◽  
Northern Coast ◽  
Eastern Canada ◽  
Tidal Zone ◽  
Lawrence Estuary ◽  
Availability Analysis ◽  
Marine System

Our study addresses winter spatial distribution of Barrow’s Goldeneyes ( Bucephala islandica (Gmelin, 1789)) and Common Goldeneyes ( Bucephala clangula (L., 1758)) at the scale of the St. Lawrence marine system (estuary and northwestern gulf), eastern Canada. Our objectives were (i) to identify and compare the physical factors that control their distributions, (ii) to quantify the level of sympatry between the two species, and (iii) to compare their distribution patterns. We analyzed large-scale synoptic views of winter distribution of both goldeneye species obtained through helicopter-borne surveys. Habitat description was obtained through spatial analyses and remote sensing. Both species showed strong preference for the tidal zone and river mouths. A multiscale analysis showed a decreasing level of sympatry as spatial resolution was refined. The distribution of the Barrow’s Goldeneye was more clustered compared with that of the Common Goldeneye, and Barrow’s Goldeneye was repeatedly observed in the same few areas. A use-availability analysis identified the northern coast of the St. Lawrence estuary as the main wintering ground for Barrow’s Goldeneye in eastern North America.

scholarly journals Radionuclide activities in sediments on the northern coast of Spitsbergen

2017 ◽  
Vol 38 (3) ◽  
pp. 291-312
Author(s):  
Barbara Wojtasik ◽  
Sławomir Świrydowicz ◽  
Dorota Burska ◽  
Kamil Nowiński
Keyword(s):  
Surface Layer ◽  
Spatial Distribution ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Specific Activity ◽  
Natural Radionuclides ◽  
Specific Radioactivity ◽  
Northern Coast ◽  
Natural Gamma ◽  
Specific Activities

Abstract The specific activity of natural gamma emitters like actinium (228Ac), bismuth (212Bi, 214Bi), lead (212Pb, 214Pb), potassium (40K), radium (224Ra), thallium (208Tl) and artificial radioisotope caesium (137Cs) was measured in 2005 in the surface layer of marine sediments in the northern Svalbard: Wijdefjorden, Woodfjorden, Vestfjorden and Bockfjorden as well as in the freshwater reservoirs in Andre Land. Nonuniform spatial distribution of these radionuclides was found. Sediment sample from Bockfjorden had the highest specific activities of all natural radionuclides. The specific radioactivity of 137Cs was much lower than specific radioactivities of natural radionuclides but there were differences between investigated locations. The distribution of 137Cs is similar to persistent organic pollutants of the lake sediments in the area.

Geographic distribution of livestock products in China- an application of spatial autocorrelation analysis

2016 ◽  
Author(s):  
Ling Gan ◽  
Xisheng HU
Keyword(s):  
Spatial Distribution ◽  
Spatial Autocorrelation ◽  
Geographic Distribution ◽  
Hot Spots ◽  
Hot Spot ◽  
Cold Spot ◽  
Northern Coast ◽  
Livestock Industry ◽  
North Eastern ◽  
Livestock Products

The rapid increase in the livestock industry in China in recent two decades has played an important role in the livelihoods of people and has become a very significant issue in terms of sustainable animal food supply chains. Knowledge gaps in the geographic distribution may hinder the sustainable development of livestock industry. This paper investigates the spatial distribution in the outputs of livestock products (meat, milk and egg, respectively) in China using exploratory spatial data analysis. This method is a set of GIS spatial statistical techniques that are useful in describing and visualizing the spatial distribution, detecting patterns of hot-spots, and suggesting spatial regimes. The global Moran’s I statistics for the three products reveal strong positive and significant spatial autocorrelation. Furthermore, the Moran significance maps indicate four hot-spots (North-eastern cluster, Northern Coast cluster, Central Inland cluster and Southern cluster) and one cold-spot (Western cluster) in the meat product distribution, one large hot-spot (Northern cluster) and one large cold-spot (South-central cluster) for the milk product, four relatively small hot-spots (North-eastern cluster, Northern Coast cluster, Eastern Coast cluster and Central Inland cluster) and one large cold-spot (Western cluster) for the egg product. Based on the results, we show that livestock products are polarized into clusters and the outputs of the products tend to be reducing from east to west and from north to south China. Implications are drawn, such as priority of resource allocations for hot-spot area in terms of animal-source food security and the utilization of spillover effects from hot-spots.

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