Restoring Slough and River Banks with Biotechnical Methods in the Sacramento-San Joaquin Delta

2004 ◽  
Vol 22 (4) ◽  
pp. 262-268 ◽  
Author(s):  
J. Hart ◽  
J. Hunter
Keyword(s):  
River Banks

Influence of Bacau City�s Antropic Activities on the Heavy Metals Concentration Measured on Bistrita and Siret River Sides

2020 ◽  
Vol 71 (1) ◽  
pp. 350-354
Author(s):  
Alexandra-Dana Chitimus ◽  
Florin-Marian Nedeff ◽  
Ion Sandu ◽  
Cristian Radu ◽  
Emilian Mosnegutu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pollution Sources ◽  
Municipal Waste ◽  
Sampling Points ◽  
River Banks

The main objective of the current research is to determine the content of heavy metals from the Bistrita and Siret River banks, respectively Siret River � in Bridge Holt area, Siret River � canal UHE and Siret River- downstream confluence Bistrita/Siret. The choice of sampling points took into consideration the areas where the pollution sources are located. Established maximum values were not exceeded in the case of mercury in the soil for all three sampling points Siret River � in Bridge Holt area, Siret River � canal UHE and Siret River- downstream confluence Bistrita/Siret. Exceeding values recorded in the sampling points Siret River � in Bridge Holt area, Siret River � canal UHE and Siret River- downstream confluence Bistrita/Siret (for cadmium, nickel and chrome) resulted from discharged residual waters, industrial platforms form Bacau city and the improper storage of municipal waste.

scholarly journals Three-dimensional niche partitioning between two colonially nesting ardeid species in central China

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuanxing Ye ◽  
Canshi Hu ◽  
Yiting Jiang ◽  
Geoffrey W. H. Davison ◽  
Changqing Ding
Keyword(s):  
Niche Partitioning ◽  
Trophic Niche ◽  
Egg Laying ◽  
Central China ◽  
Paddy Fields ◽  
Shaanxi Province ◽  
Similar Species ◽  
Wetland Birds ◽  
Cattle Egret ◽  
River Banks

Abstract Background Interspecific competition is known to be strongest between those species that are both closely related and sympatric. Egrets are colonially nesting wetland birds that often overlap and can therefore be expected to compete in roosting and nesting habitat as well as in diet. According to the niche partitioning hypothesis, it is to be expected that these similar species would show differentiation in at least one of the main niche dimensions to reduce competition. We tested niche partitioning between the colonially nesting Little Egret (Egretta garzetta) and Cattle Egret (Bubulcus ibis) in temporal, spatial and trophic dimensions. Methods Field study was conducted in three mixed egret colonies in Yangxian County, southwest Shaanxi Province, central China. For each nest colony we recorded its spatial location, the height of nesting trees and of nests, the height of roosting trees and of roosting individuals within the trees. We determined the first egg-laying and first hatching dates of the two species. Craw dissection of storm-killed egret nestlings was used to measure the diet. Six transects were surveyed to study foraging habitat selection. Results We found that hatching time of Little Egrets peaked earlier (by about 1 month) than that of Cattle Egrets. Cattle Egrets nested and roosted higher than Little Egrets. The foraging habitats used by Little Egrets were dominated by river banks (73.49%), followed by paddy fields (13.25%) and reservoirs (10.84%), whereas Cattle Egret foraging sites were characterized by grasslands (44.44%), paddy fields (33.33%) and river banks (22.22%). Little Egrets consumed more fishes (65.66%) and Odonata larvae (13.69%) than Cattle Egrets, while Cattle Egrets were found feeding mainly on Coleoptera (29.69%) and Orthoptera (23.29%). Little Egrets preyed on larger mean biomasses of food items than Cattle Egrets. Conclusions Our results confirm the niche partitioning hypothesis as a mechanism for coexistence among ecologically similar species. In two coexisting egret species, niche partitioning is multidimensional, such that the two coexistent species occupy differing ecological space based on all three temporal, spatial and trophic niche dimensions.

Modelling a sand boil reactivation in the middle-lower portion of the Po river banks

2018 ◽  
pp. 1219-1225 ◽  
Author(s):  
M.F. García Martínez ◽  
G. Gottardi ◽  
M. Marchi ◽  
L. Tonni
Keyword(s):  
Lower Portion ◽  
Po River ◽  
Sand Boil ◽  
River Banks

Factors Influencing Cultivation of the Lilongwe and Linthipe River Banks in Malawi: A Case Study of Salima District

2007 ◽  
Vol 7 (21) ◽  
pp. 3334-3337 ◽  
Author(s):  
Annie Zidana ◽  
Emmanuel Kaunda ◽  
Alexander Phiri ◽  
Abdi Khalil- Ed ◽  
George Matiya ◽  
...  
Keyword(s):  
Factors Influencing ◽  
Linthipe River ◽  
River Banks

Despite Adults: Learning Experiences on the Tapajós River Banks

Ethos ◽  
2016 ◽  
Vol 44 (3) ◽  
pp. 248-268 ◽  
Author(s):  
Chantal Medaets
Keyword(s):  
Learning Experiences ◽  
River Banks

scholarly journals Paleogeographic evolution and avulsion history of the Holocene Rhine-Meuse delta, The Netherlands

2002 ◽  
Vol 81 (1) ◽  
pp. 97-112 ◽  
Author(s):  
H.J.A. Berendsen ◽  
E. Stouthamer
Keyword(s):  
Large Scale ◽  
Sediment Load ◽  
Geographical Information ◽  
River Channels ◽  
Human Influence ◽  
Channel Pattern ◽  
The Holocene ◽  
History Of ◽  
Peat Formation ◽  
River Banks

AbstractApproximately 200,000 lithological borehole descriptions, 1200 14C dates, 36,000 dated archaeological artifacts, and gradients of palaeochannels were used to reconstruct the Holocene evolution of the fluvial part of the Rhine-Meuse delta. Ages of all Holocene channel belts were stored in a Geographical Information System database that enables generation of palaeogeographic maps for any time during the Holocene. The time resolution of the palaeogeographic reconstruction is about 200 years.During the Holocene, avulsion was an important process, resulting in frequent shifts of areas of clastic sedimentation. Palaeogeographic evolution and avulsion history of the Rhine-Meuse delta are governed by complex interactions among several factors. These are: (1) Location and shape of the Late Weichselian palaeovalley. In the Early Holocene, rivers were confined to the LateWeichselian valley. When aggradation shifted upstream, the margins of the valley were crossed by newly formed channel belts. (2) Sealevel rise, which resulted in back-filling of the palaeovalley. (3) River channel pattern. In the central-western part of the delta, a straight anastomosed channel pattern with large-scale crevassing developed as a result of sealevel rise and the associated decrease of stream power. (4) Neotectonics. Differential tectonic movements of the Peel Horst and Roer Valley Graben seem to have influenced river behaviour (formation of an asymmetrical meander belt, location of avulsion nodes in fault zones), especially from 4500–2800 14C yr BP when the rate of sealevel rise had decreased. After 2800 14C yr BP sealevel rise further decreased, and tectonic influence still may have influenced avulsions, but from then on other factors became dominant. (5) Increased discharge, sediment load and/or within-channel sedimentation. After 2800 14C yr BP, meander wavelenghts increased, which is interpreted as a result of increased bankfull discharge and/or within channel sedimentation. After 2000 14C yr BP both discharge and sediment load increased as a result of human influence. (6) Coastal configuration. The limited number of tidal inlets and extensive peat formation restricted the number of avulsions in the western part of the delta, and enhanced channel reoccupation. (7) Composition of the substrate and river banks. Meandering river channels tended to adhere to the sandy margins of the LateWeichselian palaeovalley, and high channel sinuosity is found in areas where river banks consisted of sand. Peat formation, which was most extensive in the western part of the back-barrier area especially between 4000 and 3000 14C yr BP, more or less fixed the river pattern at that time, hampering avulsions. (8) Marine ingressions, e.g. the 1421 AD St. Elizabeth’s flood caused large-scale erosion in the southwestern part of the fluvial deltaic plain, resulting in a shift of the main drainage to the SW. (9) Human influence. Since about 1100 AD human influence dominated the palaeogeographic evolution. Rivers were embanked and natural avulsions did no longer occur.

scholarly journals Stream invertebrate diversity reduces with invasion of river banks by non-native plants

2018 ◽  
Vol 64 (3) ◽  
pp. 485-496 ◽  
Author(s):  
Alex Seeney ◽  
Zarah Pattison ◽  
Nigel J. Willby ◽  
Philip J. Boon ◽  
Colin D. Bull
Keyword(s):  
Native Plants ◽  
Invertebrate Diversity ◽  
River Banks
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