scholarly journals Ecological Studies on Anagrus incarnatus Haliday (Hymenoptera : Mymaridae), an Egg Parasitoid of the Rice Planthoppers” : II. Spatial Distribution of Parasitism and Host Eggs in the Paddy Field

10.5109/23795 ◽  
1984 ◽  
Vol 29 (1) ◽  
pp. 67-76
Author(s):  
Sujin Chantarasa-ard ◽  
Yoshihiro Hirashima ◽  
Tadashi Miura
Keyword(s):  
Spatial Distribution ◽  
Paddy Field ◽  
Egg Parasitoid ◽  
Ecological Studies ◽  
Rice Planthoppers

Assessment of a three-stage sampling strategy to investigate the spatial distribution and population density of Aphelenchoides besseyi among Oryza sativa seeds

Nematology ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 373-380
Author(s):  
Katsumi Togashi ◽  
Shigeru Hoshino
Keyword(s):  
Spatial Distribution ◽  
Oryza Sativa ◽  
Paddy Field ◽  
Rice Plant ◽  
Spatial Scales ◽  
Sampling Strategy ◽  
Paddy Fields ◽  
Nematode Density ◽  
Aphelenchoides Besseyi ◽  
The Mean

AbstractThis study aimed to determine the spatial distribution patterns of Aphelenchoides besseyi among Oryza sativa seeds on panicle, plant hill, and paddy field spatial scales and to present a three-stage sampling method for estimating the mean density per seed in paddy fields. Living and dead nematodes were extracted individually from 20 seeds sampled from each of five panicles, which were sampled from each of six rice plant hills in each of eight paddy fields, where all plants had leaves exhibiting the 'white tip' symptom. Nested ANOVA indicated that A. besseyi density per seed was significantly different among the eight paddy fields, among rice plant hills in paddy fields, and among panicles in rice plant hills. The proportion of nematode-infested seeds (prevalence) increased and reached an upper limit as the mean density per seed on the panicle scale increased, whereas linear relationships were observed between nematode prevalence and the mean density on plant hill and paddy field scales. Relationships between mean density and mean crowding of nematodes per seed indicated that the nematodes exhibited clumped distribution on each of panicle, plant hill and field scales. Using these relationships, a three-stage sampling plan for estimating nematode density per seed at a specified precision level is presented.

scholarly journals Statistical methods in the context of environmental quality assessment: On the example of riparian beetles (Coleoptera, Carabidae)

2019 ◽  
Vol 252 ◽  
pp. 09010
Author(s):  
Marina Kirichenko-Babko ◽  
Yaroslav Danko ◽  
Łukasz Guz ◽  
Dariusz Majerek ◽  
Roman Babko
Keyword(s):  
Spatial Distribution ◽  
Statistical Methods ◽  
Environmental Quality ◽  
Hydrological Regime ◽  
Coastal Sediments ◽  
Environmental Research ◽  
Correct Interpretation ◽  
Ecological Studies ◽  
Environmental Quality Assessment

Modern environmental research involves the use of a broad range of statistical methods and programs. In any study, the results are obtained, as a rule, using statistical calculations, beginning with the calculation of reliability of data, and ending with complex statistical methods that allow estimating trends and predicting the processes that are evaluated. However, there is a problem associated with the correct interpretation of biological results by experts in statistics and, accordingly, the correctness of the choice and application of various statistical methods by biologists. In this paper, the evaluation of the results of studies of the effect of changes in the hydrological regime of the river caused by the functioning of the dam on the structure and spatial distribution of riparian carabids was considered. On the banks of intact rivers, the structure of the riparian assemblage naturally changes depending on the quality of coastal sediments. In order to assess the changes in the structure of the riparian assemblage, a number of statistical methods were employed. It was shown that not every method will adequately interpret the results of ecological studies. The differences in obtaining adequate interpretations while using various statistical methods were understood.

scholarly journals Investigation of Spatial Distribution of Radiocesium in a Paddy Field as a Potential Sink

PLoS ONE ◽  
2013 ◽  
Vol 8 (11) ◽  
pp. e80794 ◽  
Author(s):  
Kazuya Tanaka ◽  
Hokuto Iwatani ◽  
Yoshio Takahashi ◽  
Aya Sakaguchi ◽  
Kazuya Yoshimura ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Paddy Field

scholarly journals Spatial distribution of phenology stage on paddy field in Karawang Regency

2020 ◽  
Vol 561 ◽  
pp. 012051
Author(s):  
Supriatna ◽  
Rokhmatuloh ◽  
J M Semedi ◽  
G P Pratama ◽  
Y Ristya ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Paddy Field
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