Foraging, nesting and damage caused by Microtermes subhyalinus (Isoptera: Termitidae) in a sugarcane plantation in the Central African Republic

1996 ◽  
Vol 86 (4) ◽  
pp. 387-395 ◽  
Author(s):  
P. Mora ◽  
C. Rouland ◽  
J. Renoux
Keyword(s):  
Vertical Distribution ◽  
Linear Relationship ◽  
Root System ◽  
Central African Republic ◽  
Foraging Behaviour ◽  
Annual Production ◽  
Foraging Activity ◽  
Fungus Combs ◽  
Different Seasons ◽  
The Vertical Distribution

AbstractThe ecology of Microtermes subhyalinus Silvestri in savanna and an adjoining sugarcane plantation in the Central African Republic is described. Other species of termites were associated with savanna and sugarcane but M. subhyalinus was the most prevalent and the only one causing damage to sugarcane. Damage to the crop by M. subhyalinus was assessed throughout the year. Termite attacks were confined initially to the root system just after cutting but as the cane matured and growth ceased, termites tunnelled up into the above-ground stems. Losses accounted for 5–10% of total annual production. The nesting and foraging behaviour of this species altered with the change from natural savanna to sugarcane cultivation. The vertical distribution of M. subhyalinus fungus combs in soil under savanna and sugarcane over different seasons was analysed. There was a linear relationship between monthly rainfall and foraging activity in savanna while in sugarcane no relationship was observed.

scholarly journals Vertical distribution and structure of copepod (Arthropoda: Copepoda) assemblages in two different seasons down to 1,200 m in the tropical Southwestern Atlantic

2018 ◽  
Vol 35 ◽  
pp. 1-11
Author(s):  
Cristina de Oliveira Dias ◽  
Adriana Valente de Araujo ◽  
Sérgio Luiz Costa Bonecker
Keyword(s):  
Environmental Factors ◽  
Vertical Distribution ◽  
Rainy Season ◽  
Dry Season ◽  
Total Density ◽  
Southwestern Atlantic ◽  
Southwestern Atlantic Ocean ◽  
Different Seasons ◽  
Dry Seasons ◽  
The Vertical Distribution

The vertical distribution of copepod assemblages, ascertained from the surface down to 1,200 m, was investigated during two sampling periods (rainy and dry seasons), at four depths, in the oligotrophic waters of the southwestern Atlantic Ocean. Total density, diversity, and richness differed among sampling depths. Copepod density decreased with depth in the two sampling periods, with a maximum at 1 m and a slight decrease at 800 m. Higher diversities were observed at 250 m and 1,200 m during the rainy season and at 1 m and 1,200 m during the dry season. The maximum number of species was found at 1,200 m during the rainy season and at 1 m during the dry season. Various copepod assemblages were delimited in the water column in the two sampling periods. The deeper copepod assemblages occupied a wider range of depths. Salinity and temperature influenced the structure of copepod assemblages and reflected the hydrographic characteristics of the water masses in the region. Candaciapachydactyla (Dana, 1849), Scolecithrixdanae (Lubbock, 1856), and Agetuslimbatus (Brady, 1883) were the indicator species found at 1 m. The effects of different environmental factors on the copepod assemblages suggest that these consortia occupy distinct niches in the ocean.

The vertical distribution of thin features over the Arctic analysed from CALIPSO observations. Part I: Optically thin clouds

Tellus B ◽  
2011 ◽  
Vol 63 (1) ◽  
Author(s):  
Abhay Devasthale ◽  
Michael Tjernström ◽  
Karl-Göran Karlsson ◽  
Manu Anna Thomas ◽  
Colin Jones ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
The Arctic ◽  
The Vertical Distribution

scholarly journals Continuous borehole optical televiewing reveals variable englacial debris concentrations at Khumbu Glacier, Nepal

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Katie E. Miles ◽  
Bryn Hubbard ◽  
Evan S. Miles ◽  
Duncan J. Quincey ◽  
Ann V. Rowan ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Water Supply ◽  
Depth Profile ◽  
Variable Thickness ◽  
Surface Melting ◽  
High Mountain ◽  
Ablation Area ◽  
The Mean ◽  
Surface Melt ◽  
The Vertical Distribution

AbstractSurface melting of High Mountain Asian debris-covered glaciers shapes the seasonal water supply to millions of people. This melt is strongly influenced by the spatially variable thickness of the supraglacial debris layer, which is itself partially controlled by englacial debris concentration and melt-out. Here, we present measurements of deep englacial debris concentrations from debris-covered Khumbu Glacier, Nepal, based on four borehole optical televiewer logs, each up to 150 m long. The mean borehole englacial debris content is ≤ 0.7% by volume in the glacier’s mid-to-upper ablation area, and increases to 6.4% by volume near the terminus. These concentrations are higher than those reported for other valley glaciers, although those measurements relate to discrete samples while our approach yields a continuous depth profile. The vertical distribution of englacial debris increases with depth, but is also highly variable, which will complicate predictions of future rates of surface melt and debris exhumation at such glaciers.

A case study on the vertical distribution and characteristics of aerosols using ground-based raman lidar, satellite and model over Western India

2021 ◽  
Vol 42 (17) ◽  
pp. 6421-6436
Author(s):  
Sourita Saha ◽  
Som Sharma ◽  
K. Niranjan Kumar ◽  
Prashant Kumar ◽  
Vaidehi Joshi ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Western India ◽  
Raman Lidar ◽  
The Vertical Distribution
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