Geostatistical Analysis and the Impact of Moisture on the Spatial and Temporal Distribution of larvalMusca domestica(Diptera: Muscidae)

2002 ◽  
Vol 31 (2) ◽  
pp. 273-280 ◽  
Author(s):  
Patrick C. Tobin ◽  
Charles W. Pitts
2018 ◽  
Vol 246 ◽  
pp. 01046
Author(s):  
Zhihui Ren ◽  
Ting Wang ◽  
Yuanjian Wang ◽  
Shaojun Qu

Based on measured data of the Wanjiazhai Reservoir in different periods, the characteristics of the spatial and temporal distribution of sedimentation in the reservoir area were preliminarily analyzed and the impact of reservoir operation on this distribution was discussed. Primary conclusions are as followed: in terms of temporal distribution, sedimentation continuously accumulated over the period from 2000 to 2017, with the sediment deposition ratio dramatically decreasing between 2011 and 2017; in terms of spatial distribution, the sedimentation in the reservoir area was mainly concentrated downstream of the WD54 section, with the highest concentration being downstream of the WD23 section. The characteristics of sedimentation distribution in the reservoir area were closely related to inflow and sediment conditions and reservoir operation water level. When the water level was lower than 952 m, the sediment deposition ratio was lower than 0. To further improve the sediment deposition form in the reservoir area, lowering water level and ejecting the sediment are recommended in a timely manner.


1980 ◽  
Vol 31 (4) ◽  
pp. 485 ◽  
Author(s):  
DW Rimmer

Time-series sampling for early-stage phyllosoma of P. cygnus was carried out off the western coast of Australia near the centre of the population of breeding adults. Hatching occurred from November through February in 1973-74 and 1974-75. Spatial distribution of the larvae was similar between the two seasons studied. The density of newly hatched (stage I) phyllosoma was greatest along the off-shore portion of the continental shelf. The majority of larvae moved off shore soon after hatching and the relative abundance of stages 11 and 111 increased with distance off shore. An off-shore extension of the sampling yielded an estimated minimum net rate of off-shore transport of 5.25 km,day for the stage I phyllosoma taken at the station farthest off shore. In 1973-74. larval release increased gradually from a low level in November to a peak in mid January. In 1974-75 larval release commenced at least a month earlier and peaked in late November, tapered off through December, and peaked again in mid January. Water temperature correlated with temporal differences in larval release. Warmer temperatures early in the 1974-75 season apparently induced the onset of breeding early enough to permit a second breeding by some females. There appeared to be no periodicity of hatching related to the lunar cycle. The distribution of early-stage phyllosoma was patchy and the impact of patchiness on quantitative sampling is discussed.


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