scholarly journals Spatial–Temporal Distribution of the Euphausiid Euphausia pacifica and Fish Schools in the Coastal Southwestern East Sea

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 203
Author(s):  
Hyungbeen Lee ◽  
Junghwa Choi ◽  
Yangjae Im ◽  
Wooseok Oh ◽  
Kangseok Hwang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Temporal Distribution ◽  
Detection Algorithm ◽  
East Sea ◽  
Acoustic Backscatter ◽  
Euphausia Pacifica ◽  
Temporal And Spatial Distribution ◽  
Fish Schools ◽  
Acoustic Data ◽  
Temporal And Spatial

The spatial and temporal distribution of euphausiid Euphausia pacifica and fish schools were observed along acoustic transects in the coastal southwestern East Sea. Two-frequency (38- and 120-kHz) acoustic backscatter data were examined from April to July 2010. A dB identification window (SV120–38) and school detection algorithm identified E. pacifica and fish schools in the acoustic backscatter, respectively. The E. pacifica was regularly observed in middle of southern waters, where phytoplankton was abundant during spring, and irregularly during summer, when phytoplankton was homogeneously distributed. Using the distorted-wave Born approximation model, the acoustic density of E. pacifica calculated was higher in spring (April: 75.9 mg m−2, May: 85.3 mg m−2) than in summer (June: 71.4 mg m−2, July: 54.1 mg m−2). The fish schools in the acoustic data tended to significantly increase from spring to summer. Although major fish species, such as anchovies and herring, fed on copepods and euphausiids in the survey area, the temporal and spatial distribution of E. pacifica was weakly correlated with the distribution of the fish schools. These findings aid in our understanding of the temporal and spatial distribution dynamics of euphausiids and fish schools in the food web of the coastal southwestern East Sea.

scholarly journals Distribusi Temporal dan Spatial Arthropoda Pada Berbagai Jenis Tumbuhan Liar di Agroekosistem

bionature ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Muhammad Richsan Yamin ◽  
Siti Annisaa'ul Kariimah ◽  
Nadya Rizky Nuzul Ramadhanti ◽  
Intan Ayu Idha Wulandari
Keyword(s):  
Spatial Distribution ◽  
Data Collection ◽  
Light Intensity ◽  
Abiotic Factors ◽  
Biological Clock ◽  
Temporal Distribution ◽  
Wild Plant ◽  
Temporal And Spatial Distribution ◽  
Temperature And Humidity ◽  
Temporal And Spatial

Abstract. The purpose of this research were to (1) analyse the temporal and spatial distribution of arthropods in the cassava and eggplant agroecosystem areas. (2) Analysing the temporal and spatial distribution of arthropods in the maize agroecosystem. This research was divided into 2 stations,  the first station which is near the trail in the eggplant and corn agroecosystem, while for the second station on the corn agroecosystem, the two research locations are in Maccorawalie Village, Watang Sawitto District, Pinrang Regency, South Sulawesi. This research use the analytical method to analyse the observations and also identify the families of each arthropod found, then count the number of arthropods in each species and measure the diversity and abundance of each wild plant found at station 1 and station 2 in the morning and afternoon. The translation of the results obtained from the results of data collection at two stations in two data collection times (morning and afternoon) in the day, where the morning is 06.00-8.00 WITA Zone, while in the afternoon at 16.00-17.30 WITA zone. This is due to abiotic factors such as temperature and humidity, where the temperature in the morning is 23°C with 92% humidity, while the afternoon temperature is 25°C with 77% humidity. Arthropods have a different temporal distribution because this is related to the biological clock in each Arthropod. Biological clock allows Arthropods to determine when to work and rest. The existence of a rhythm in insects resulted in the division of two living groups, known as diurnal (active during the day) and nocturnal. Abiotic factors in the form of light intensity, temperature and humidity, affect the activity patterns of insects that have a certain temperature range, light intensity and humidity in Maccorawalie Village, Watang Sawitto District, Pinrang Regency.Keywords: temporal distribution, spatial distribution, arthropods, agroecosystem.

scholarly journals Application of Morishita Spread Index to temporal and spatial distribution characteristics of landslides in Shanxi and Gansu provinces of China

2000 ◽  
Vol 21 ◽  
Author(s):  
Luo Wenqiang ◽  
Zhang Zhuoyuan ◽  
Huang Runqiu
Keyword(s):  
Spatial Distribution ◽  
High Frequency ◽  
Temporal Distribution ◽  
The Other ◽  
Distribution Characteristics ◽  
Temporal And Spatial Distribution ◽  
Landslide Occurrence ◽  
Cluster Distribution ◽  
Spatial Distribution Characteristics ◽  
Temporal And Spatial

Morshita Spread Index Iδ was applied for the study of temporal and spatial distribution characteristics of landslides in the Shanxi and Gansu provinces of China. For this purpose, the landslides larger than 105 m3 in volume were considered. In the study area, the spatial distribution of Morishita Spread Index Iδ (l) isgreater than 1 and decreases with increasing mesh scale. Such a trend indicates cluster distribution of landslides. On the other hand, the temporal distribution of Morishita Spread Index Iδ (t) for the above landslides showed a maximum and a minimum, corresponding to the years with high frequency of landslide occurrence.

scholarly journals Temporal and Spatial Distribution of Heavy Metal in Sediment of Urban Coastal Waters: A Case Study in Jakarta Bay, Indonesia

2017 ◽  
Vol 32 (1) ◽  
Author(s):  
Fitri Budiyanto ◽  
Lestari Lestari
Keyword(s):  
Heavy Metals ◽  
Spatial Distribution ◽  
Anthropogenic Activities ◽  
Temporal Distribution ◽  
Anthropogenic Source ◽  
Elevated Concentration ◽  
Temporal And Spatial Distribution ◽  
Hazardous Chemical ◽  
Marine System ◽  
Temporal And Spatial

Heavy metals, hazardous chemical substances, increase in marine environment due to anthropogenic discharges. However, due to the hydrodynamic of the marine system these metals could vary both temporal and spatial distribution of metals in Jakarta Bay. This study was to reveal the temporal and spatial distribution of metals in sediment over the bay and to assess the environmental condition. Sediment samples were collected in11 stations of March (transitional season) and June(dry season)2013. The result showed that the concentration of heavy metals varied spatially, in which elevated concentration occurred adjacent terrestrial indicating the enrichment of metal-anthropogenic source, but insignificant temporarily.Keywords: heavy metals, spatial distribution, temporal distribution, anthropogenic activities, Jakarta Bay. Logam berat merupakan bahan berbahaya yang tersebar di lingkungan laut karena pengaruh aktifitas antropogenik. Akan tetapi, logam berat ini dapat terdistribusi secara temporal ataupun spasial di Teluk Jakarta akibat sistem hidrodinamika laut. Tujuan dari penelitian ini adalah untuk mengetahui distribusi spasial dan temporal logam berat dalam sedimen dan untuk menilai kondisi lingkungan teluk. Sedimen diambil dari 11 stasiun pada bulan Maret (musim transisi) dan Juni (musim kering) tahun 2013. Hasil penelitian menunjukkan bahwa distribusi spasial logam berat bervariasi, dimana konsentrasinya meningkat di lokasi dekat daratan yang mengindikasikan tingginya sumber logam-antropogenik namun secara temporal tidak signifikan.Kata kunci: logam berat, distribusi spasial, distribusi temporal, kegiatan antropogenik, Teluk Jakarta.

The Temporal and Spatial Vegetation Variation of Liaohe Basin and its Relation with Climate Changes

2014 ◽  
Vol 1051 ◽  
pp. 567-572
Author(s):  
Xiao Chen Wang ◽  
Jing Hai Zhu ◽  
Yuan Man Hu ◽  
Wei Ling Liu
Keyword(s):  
Spatial Distribution ◽  
Climate Changes ◽  
Temporal Distribution ◽  
Vegetation Coverage ◽  
Gis Technology ◽  
Temporal And Spatial Distribution ◽  
Liaohe Basin ◽  
Temporal And Spatial ◽  
Precipitation And Temperature ◽  
Vegetation Variation

In this paper, 2000-2010 NDVI data of Liaohe Basin is obtained with the RS technology; the distribution map of precipitation and air temperature in Liaohe Basin is generated by the GIS technology, and then the temporal and spatial vegetation variation of Liaohe Basin and its relation with climate changes have been studied by means of raster data spatial analysis, correlation analysis and multiple regression analysis, so as to provide a scientific basis for ecological environment protection, planning and development of Liaohe Basin. It is shown from results that: 1) From 2000 to 2010, the vegetation coverage increased significantly; which presents a gradual decrease from east to west on the spatial distribution; 2) For the temporal distribution, the precipitation presents a fluctuant upward trend; while temperature is fluctuated significantly with a slight decrease. For the spatial distribution, precipitation decreased gradually from the east to west, while temperature rises from the northeast to southwest; and 3) Vegetation coverage of Liaohe Basin is positively related with precipitation and temperature in the temporal and spatial distribution, but not significantly, it is indicated that, except for the meteorological factors, the artificial impact and other factors, such as land use, played an important role to vegetation variation of Liaohe Basin in the recent 10 years. However in terms of two influence factors of precipitation and temperature, the former has significantly contributed to NDVI change of Liaohe Basin.

scholarly journals Temporal distribution of linear densities of the plasma column in a plasma focus discharge

Nukleonika ◽  
2015 ◽  
Vol 60 (2) ◽  
pp. 315-318 ◽  
Author(s):  
Balzhima Cikhardtova ◽  
Pavel Kubeš ◽  
Jakub Cikhardt ◽  
Marian Paduch ◽  
Ewa Zielinska ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Plasma Focus ◽  
Plasma Column ◽  
Dense Plasma ◽  
Temporal Distribution ◽  
Plasma Focus Device ◽  
Zehnder Interferometer ◽  
Temporal And Spatial Distribution ◽  
Temporal And Spatial ◽  
Plasma Focus Discharge

Abstract Experiments were carried out on the PF-1000 plasma focus device, with a deuterium filling and with deuterium puffing from a gas-puff nozzle placed on the axis of the anode face. The current was reaching 2 MA. 15 interferometric frames from one shot were recorded with a Nd:YLF laser and a Mach–Zehnder interferometer, with 10–20 ns delay between the frames. As a result, the temporal and spatial distribution of the linear densities and the radial and axial velocities of the moving of plasma in the dense plasma column could be estimated.

scholarly journals Spatial and temporal distribution of decapod larvae in the subtropical waters of the Arvoredo archipelago, SC, Brazil

2006 ◽  
Vol 96 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Andréa G. Koettker ◽  
Andrea S. Freire
Keyword(s):  
Spatial Distribution ◽  
Temporal Distribution ◽  
Shallow Waters ◽  
General Tendency ◽  
Temporal And Spatial Distribution ◽  
Temporal And Spatial ◽  
Abundance And Diversity ◽  
One Year ◽  
Planktonic Community ◽  
Decapod Larvae

The present paper aims to describe the temporal and spatial distribution of the composition and abundance of Decapoda larvae in the shallow waters around Arvoredo Marine Biological Reserve. Stomatopod occurrence is also discussed. Plankton samples were collected at five sites around the Arvoredo Island every two months for one year from May, 2002 to April, 2003. Thirty-nine morphotypes, 11 genus and 4 species (Artemesia longinaris Bate, 1888, Hexapanopeus schmitii Rathbun, 1930, Menippe nodifrons Stimpson, 1859 and Pleoticus muelleri Bate, 1888) were identified, among them only two morphotypes of Stomatopoda larvae, and the remainder Decapoda larvae. Brachyuran zoeae were the most abundant group and they were well represented by Portunidae and Xanthidae zoeae. Lucifer sp. and Caridea zoeae were the most abundant non-brachyuran taxa. Decapod larvae were observed to occur at all sampling sites, however the spatial distribution demonstrated a general tendency to greater abundance and diversity at the southern sites of the Island. Decapoda and Stomatopoda larvae occurred throughout the year, showing that reproduction is continuous, but that larval input in planktonic community was significantly higher during autumn and spring.

An Analysis of Temporal and Spatial Distribution Characteristics of Water Resources in Guangdong Province, China

2014 ◽  
Vol 522-524 ◽  
pp. 895-901 ◽  
Author(s):  
Qi Zhou ◽  
Yong Pang
Keyword(s):  
Spatial Distribution ◽  
Water Resources ◽  
Cloud Model ◽  
Temporal Distribution ◽  
Guangdong Province ◽  
Pearl River ◽  
Temporal And Spatial Distribution ◽  
Spatial Distribution Characteristics ◽  
Temporal And Spatial ◽  
The Pearl River

In view of the difficulty in giving a quantitative description of the degree of uneven distribution of water resources, this paper, based on a cloud model, explores the temporal and spatial distribution characteristics of water resources in some research areas in Guangdong Province by using quantitative methods. The results show that, firstly, cloud images of a cloud model make it possible to describe intuitively the characteristics of the temporal and spatial distribution of water resources and present the differences of these characteristics in different areas through numerical characteristic values. Secondly, there are the least amounts of water resources in western Guangdong and the most in the Pearl River Delta Area. Temporal allocation of water resources is difficult in the northern and eastern parts of this province while spatial allocation difficult in the eastern and western parts. Thirdly, there are more water resources, less non-uniformity in the temporal distribution, greater stability in terms of temporal and spatial distribution but greater non-uniformity in the spatial distribution of water resources in the downstream than upstream of the Pearl River in Guangdong Province. Fourthly, there is less non-uniformity in the spatial distribution than in the temporal distribution in northern Guangdong while stability of spatial distribution is worse than that of the temporal distribution in western Guangdong. In addition, there is less uniformity but greater stability in the spatial distribution than in the temporal distribution of water resources in each research area.

Analysis on the Spatio-Temporal Distribution Characteristics of Atmospheric Dustfall in Jinan City

2014 ◽  
Vol 955-959 ◽  
pp. 1587-1590
Author(s):  
Fen Zhao ◽  
Li Rong Xu
Keyword(s):  
Spatial Distribution ◽  
Temporal Distribution ◽  
Ecological Environment ◽  
Distribution Characteristics ◽  
Spring Season ◽  
Temporal And Spatial Distribution ◽  
Jinan City ◽  
Temporal And Spatial ◽  
Spatio Temporal ◽  
One Year

The data of 116 atmospheric dust monitoring points in Jinan from 2009 to 2012 were analyzed. The average annual atmospheric dustfall was maintained at 10.47 to 14.34 t•km-2•month-1, and the change was less than 15.14%. Within one year, the atmospheric dustfall was mainly concentrated in the spring season (March to May), accounting for 27.72% to 33.44% of the annual dustfall. The lowest dustfall was concentrated in September to November. The dustfall in Jinan City was generally in a decreasing trend. The dustfall of each district is different from one another, the arrangement of 6 districts in Jinan is Huaiyin> Tianqiao> Shizhong> Licheng> Lixia>Changqing. Special meteorological and ecological environment are the mainly factors to influence temporal and spatial distribution of the dustfall in Jinan.

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