Polistes paper wasps use a transient floating vegetation mat in the Banhine wetlands outflow, Mozambique

2020 ◽  
Vol 58 (4) ◽  
pp. 849-851 ◽  
Author(s):  
Markus Klemens Zaplata
Keyword(s):  
Paper Wasps ◽  
Floating Vegetation

Transverse Distribution of the Streamwise Velocity for the Open-channel Flow With Floating Vegetated Islands

2021 ◽  
Author(s):  
Xuecheng Fu ◽  
Feifei Wang ◽  
Mengyang Liu ◽  
Wenxin Huai
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Flow Characteristics ◽  
Open Channel Flow ◽  
Streamwise Velocity ◽  
Transport Efficiency ◽  
Transverse Distribution ◽  
Floating Vegetation ◽  
Shear Turbulence ◽  
Field Disturbance

Abstract Floating vegetation islands (FVIs) have been widely utilized in various river ecological restoration projects due to their ability to purify pollutants. FVIs float at the surface of shallow pools with their roots unanchored in the sediment. Biofilm formed by roots under islands filters nutrients and particles in the water flowing through it. Flow field disturbance will occur and transverse distribution of flow velocity will change due to the existence of FVIs. Transport efficiency of suspended solids, nutrients, and pollutants will also be altered. A modified analytical model that considers effects of boundary friction, drag force of vegetation, transverse shear turbulence, and secondary flow is established to predict transverse variation of depth-averaged streamwise velocity for the open-channel flow with FVIs using Shiono and Knight method. The simulation results with suitable boundary conditions successfully predicted lateral profile of the depth-averaged streamwise velocity compared with the experimental results of symmetrical and unsymmetrical arrangements of FVIs. Hence, the presented model can provide guidance for investigating flow characteristics of rivers with FVIs.

Paper Wasps

2008 ◽  
pp. 2728-2728
Author(s):  
J. Howard Frank ◽  
J. Howard Frank ◽  
Michael C. Thomas ◽  
Allan A. Yousten ◽  
F. William Howard ◽  
...  
Keyword(s):  
Paper Wasps

Foundress Interactions in Paper Wasps (Polistes)

2019 ◽  
pp. 177-184
Author(s):  
Robert W. Matthews
Keyword(s):  
Paper Wasps

A phytogeographic survey of Southern Benin

Bothalia ◽  
1983 ◽  
Vol 14 (3/4) ◽  
pp. 579-585 ◽  
Author(s):  
G. Paradis
Keyword(s):  
Fresh Water ◽  
Soil Characteristics ◽  
Deciduous Forests ◽  
Human Influence ◽  
The West ◽  
Rainfall Gradient ◽  
Floating Vegetation ◽  
Lophira Lanceolata ◽  
Southern Benin ◽  
Forest Islands

Southern Benin has a dry subequatoriai climate with a rainfall gradient from 850 mm in the west to 1 500 mm in the east, the geomorphology is varied and the vegetation has been subjected to strong human influence. There are numerous plant formations, namely: 1, forest islands which are probably relics of the primitive vegetation and include (a) dense semi-deciduous forests of several types, (b) swamp forests of two types, (c) periodically flooded forest of two types, (d) Lophira lanceolata  (Hutchinson Dalziel, 1954-72) woodlands and (e) mangrove swamps; 2, formations which are probably derived and include (a) thickets of several types, (b) tree savannas and shrub savannas, (c) grassy savannas and prairies varying according to soil characteristics and (d) halophytic grasslands; and 3, floating vegetation on fresh-water lakes.

Paper wasps are darker at high elevation

2020 ◽  
Vol 89 ◽  
pp. 102535 ◽  
Author(s):  
André R. de Souza ◽  
Angie Z. Mayorquin ◽  
Carlos E. Sarmiento
Keyword(s):  
High Elevation ◽  
Paper Wasps
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