scholarly journals Paleoflood records from sinkholes using an example from the Ebro River floodplain, northeastern Spain

2017 ◽  
Vol 88 (1) ◽  
pp. 71-88 ◽  
Author(s):  
Francisco Gutiérrez ◽  
Mario Zarroca ◽  
Carmen Castañeda ◽  
Domingo Carbonel ◽  
Jesús Guerrero ◽  
...  
Keyword(s):  
Ebro River ◽  
River Floodplain ◽  
Gravel Beds ◽  
Slack Water ◽  
Collapse Sinkhole ◽  
Instrumental Record ◽  
River Flood ◽  
High Competence ◽  
First Time

AbstractThis work introduces for the first time the concept of using sinkholes in fluvial valleys as recorders of past floods. The notion is illustrated through the investigation of a complex sinkhole located in a broad floodplain underlain by salt-bearing Cenozoic evaporites. This active sinkhole comprises a large subsidence depression affecting the floodplain and the edge of a terrace, and a nested collapse sinkhole that used to host a sinkhole pond. A borehole drilled in the buried sinkhole pond revealed an ~7.8-m-thick fill that records around 2700 yr of clayey lacustrine deposition interrupted by three types of detrital facies. Two thick pebble gravel beds have been attributed to major high-competence floods: a paleoflood that occurred in Visigothic times (1537–1311 cal yr BP) and the 1961 Great Ebro River Flood, which is the largest event of the instrumental record. A trench dug in the portion of the terrace affected by subsidence exposed a mid-Holocene slack-water paleoflood deposit. The disadvantages and advantages of sinkholes as archives of past flood histories are discussed.

New data on transuranium elements in the ecosystem of the Yenisei river floodplain

2007 ◽  
Vol 95 (9) ◽  
Author(s):  
A. Bolsunovsky ◽  
A. Ermakov ◽  
A. Sobolev
Keyword(s):  
Yenisei River ◽  
Transuranium Elements ◽  
River Floodplain ◽  
The Yenisei River ◽  
First Time

The aim of the study is to investigate levels of transuranium elements in the ecosystem of the Yenisei river floodplain in the vicinity of the Mining-and-Chemical Combine of Rosatom. For the first time, the transuranium isotopes

scholarly journals Revealing capture sites and movements by strontium isotope analyses in bones of Caiman yacare in the Beni river floodplain, Bolivia

2021 ◽  
Author(s):  
Marc Pouilly ◽  
Sergio Gomez ◽  
Christophe Pecheyrann ◽  
Sylvain Berail ◽  
Gustavo Alvarez ◽  
...  
Keyword(s):  
Isotopic Ratio ◽  
Outer Part ◽  
High Fidelity ◽  
River Floodplain ◽  
Individual Life ◽  
Isotopic Variation ◽  
Or Groups ◽  
The Individual ◽  
First Time ◽  
Isotope Analyses

Studying the distribution of organisms and their movements is fundamental to understand population dynamics. Most studies indicated that crocodilians do not move around much but several studies demonstrated that some species showed movement patterns. Detection of these movements along the individual life is still a challenge. In this study we analyzed the variation of strontium isotopic ratio (87Sr/86Sr) in the femur bones of 70 Caiman yacare individuals caught in 16 sites located in five hydrological sectors of the Beni river floodplain in Bolivia. Our results demonstrated for the first time that such a methodology could yield indications about the capture sites and reconstruct individual life history. Analyses of the outer part of the femur of 70 individuals showed that capture sites could be differentiated between sectors and even between sites or groups of sites in each sector. Studies of complete 87Sr/86Sr profiles along the femur, representing entire life of the individual, were performed on 33 yacares. We found that most of the individuals did not show any significant isotopic variation throughout their lives. This absence of variation could result from a high fidelity to the birth site, and/or from an insignificant isotopic variation between the water bodies through which the animal has potentially moved. However, 24% of the analyzed individuals presented significant variations that can be considered as movements between different habitats. Based on the observed low proportion of moving yacares, we advocated that each water body should be considered an individual management unit.

scholarly journals Hydrologic and land-use change influence landscape diversity in the Ebro River (NE Spain)

2008 ◽  
Vol 5 (5) ◽  
pp. 2759-2789 ◽  
Author(s):  
A. Cabezas ◽  
F. A. Comin ◽  
S. Begueria ◽  
M. Trabucchi
Keyword(s):  
Flow Regime ◽  
Landscape Patterns ◽  
Landscape Diversity ◽  
Ebro River ◽  
River Floodplain ◽  
Fluvial Dynamics ◽  
Realistic Option ◽  
Management Plans ◽  
River Corridor ◽  
Ne Spain

Abstract. The landscape dynamics (1927–2003) of one reach at the Middle Ebro River (NE Spain) was examined using aerial pictures and GIS techniques. Moreover, changes in the natural flow regime and anthropic activities within the river-floodplain system were investigated. Our results indicate that hydrological and landscape patterns have been dramatically changed during the last century as a consequence of human alteration of the fluvial dynamics within the studied reach, as well as the overall basin. The magnitude and variability of river discharge events have decreased, especially since 1981, and flood protection structures have disrupted the river floodplain connectivity. As a result, the succesional pathways of riparian ecotopes have been heavily modified because natural rejuvenation no longer takes place, resulting in decreased landscape diversity. It is apparent from these data that floodplain restoration must be incorporated as a significant factor into river management plans if a more natural functioning wants to be retrieved. The ecotope structure and dynamics of the 1927–1957 should be adopted as the guiding image, whereas hydrologic and landscape (dykes, raised surfaces) patters should be considered. Under the current socio-economic context, the more realistic option seems to create a dynamic river corridor reallocating dykes and lowering floodplain heights. The extent of this river corridor should adapt to the restored flow regime, although periodic economic investments could be an option if the desired self-sustained dynamism is not reached.

scholarly journals Fauna of leaf beetles (Coleoptera, Chrysomelidae) of isolated Volga Islands and mechanisms of their secondary settlement

2018 ◽  
Vol 7 (4) ◽  
pp. 97-103
Author(s):  
Sergey Ivanovich Pavlov ◽  
Andrey Stepanovich Yaitsky
Keyword(s):  
Autonomous Navigation ◽  
Field Research ◽  
Volga River ◽  
Leaf Beetles ◽  
River Floodplain ◽  
Laboratory Conditions ◽  
Secondary Settlement ◽  
River Flood ◽  
Floating Objects ◽  
Samarskaya Luka

The following paper deals with the study that was carried out during 1974-2016 in natural and laboratory conditions in the Samara Region. The authors studied the features of adults leaf beetles survival as a result of the Volga river flood spill, flooding of the isolated island systems as well as migratory processes of insects. Over a 12-year period of field research, 11 entomologists, using 2 traditional and 6 authors methods, have collected 29 species of Chrysomelidae beetles on 11 large Volga Islands (3 of which are periodically flooded) and 20 large, regularly flooded shallows and braids. It is established that the fauna of the Islands leaf beetles is very close to the fauna of adjacent coasts by genesis. The authors analyze the origin and relief of typical Islands, the level of flood waters, the duration of flooding of the Volga river floodplain near Samarskaya Luka, the mechanisms of survival of beetles by adapting them to the conditions of habitats or features of their migrations, with the secondary settlement of island systems. It is established that, in addition to the active flight and autonomous navigation to the Islands, beetles use available boats - rafts from vegetable flood sludge, small and fairly large floating objects (from branches and boards to river vessels). It is established that migrations occur annually, completely regardless of the island beetles-predecessors population wintering success.

scholarly journals Hydrologic and landscape changes in the Middle Ebro River (NE Spain): implications for restoration and management

2009 ◽  
Vol 13 (2) ◽  
pp. 273-284 ◽  
Author(s):  
A. Cabezas ◽  
F. A. Comín ◽  
S. Beguería ◽  
M. Trabucchi
Keyword(s):  
Landscape Patterns ◽  
Ebro River ◽  
River Floodplain ◽  
Economic Context ◽  
Fluvial Dynamics ◽  
Realistic Option ◽  
Management Plans ◽  
Discharge Regime ◽  
River Corridor ◽  
Ne Spain

Abstract. The changes of landscape (1927–2003), discharge regime and anthropic activities with the river-floodplain of one reach at the Middle Ebro River (NE Spain) were investigated with the objective to identify the factors that best explain the natural ecotope succession and propose a realistic restoration option with consideration of the landscape dynamics during the last century and the socio-economic context. Our results indicate that hydrological and landscape patterns have been dramatically changed during the last century as a consequence of human alteration of the fluvial dynamics within the studied reach. The magnitude and variability of river discharge events have decreased at the end of the last century, and flood protection structures have disrupted the river floodplain connectivity. As a result, the succesional pathways of riparian ecotopes have been heavily modified because natural rejuvenation no longer takes place, resulting in decreased landscape diversity. It is apparent from these data that floodplain restoration must be incorporated as a significant factor into river management plans if a more natural functioning wants to be retrieved. The ecotope structure and dynamics of the 1927–1957 period should be adopted as the guiding image, whereas current hydrologic and landscape (dykes, raised surfaces) patterns should be considered. Under the current socio-economic context, the more realistic option seems to create a dynamic river corridor reallocating dykes and lowering floodplain heights. The extent of this river corridor should adapt to the restored flow regime, although periodic economic investments could be an option if the desired self-sustained dynamism is not reached.

The endoparasites of Liasis fuscus (Serpentes : Boidae) from the Adelaide River floodplain, Northern Territory, Australia

2015 ◽  
Vol 63 (2) ◽  
pp. 81
Author(s):  
E. Mulder ◽  
L. R. Smales
Keyword(s):  
Species Richness ◽  
Flood Plain ◽  
Northern Territory ◽  
Parasite Fauna ◽  
Wet Season ◽  
River Floodplain ◽  
River Flood ◽  
Seasonal Diversity ◽  
Low Prevalence ◽  
Prevalent Species

This study documents the parasite assemblage of Liasis fuscus Peters, 1873 from the Adelaide River flood plain, Northern Territory, Australia. In total, nine species of helminth (comprising three cestodes and six nematodes), one pentastome and one protozoan were found in 180 water pythons, with the Nematoda being the dominant and most diverse group, and a cestode, Bothridium ornatum Maplestone & Southwell, 1923, the most prevalent species. In spite of the hosts being present in high numbers the helminth assemblage was depauperate, characterised by low prevalence, intensity, frequency and abundance of species, with neither season nor sex of host affecting abundance. There were, however, significant differences between ages of hosts, juveniles having fewer parasites, and seasonal diversity, with the wet season of 2004 and the dry of 2005 the most similar. Of the Australian python species analysed Morelia spilota (Lacépède, 1804) had the highest species richness. The lower species richness found in L. fuscus was possibly due to its unusual biology. Biogeographic relationships of the parasite fauna of L. fuscus are diverse, connections with Africa, Asia, and South America being noted.

scholarly journals First approach to understanding riparian wetlands in the Middle Ebro River floodplain (NE, Spain): Structural characteristics and functional dynamics

Limnetica ◽  
2007 ◽  
Vol 26 (2) ◽  
pp. 373-386
Author(s):  
Belinda Gallardo ◽  
Mercedes García ◽  
Alvaro Cabezas ◽  
E. González ◽  
Cecilia Cianncarelli ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Riparian Wetlands ◽  
Ebro River ◽  
River Floodplain ◽  
Functional Dynamics ◽  
Ne Spain

Three new species of Bidessodes Régimbart (Insecta, Coleoptera, Dytiscidae) from the Amazon river floodplain

Zootaxa ◽  
2009 ◽  
Vol 2034 (1) ◽  
pp. 43-48 ◽  
Author(s):  
RAFAEL BENZI BRAGA ◽  
NELSON FERREIRA-JR.
Keyword(s):  
New Species ◽  
Identification Key ◽  
Amazon River ◽  
River Floodplain ◽  
Three New Species ◽  
First Time

Three new species of Bidessodes (Coleoptera, Dytiscidae) are described and illustrated from the Amazon river floodplain (“várzea”): B. nessimiani sp. nov., B. hamadae sp. nov., and B. demarcoi sp. nov. Bidessodes evanidus Young is recorded for the first time from Amazonas and Pará states, Brazil. All species are included in the subgenus Bidessodes s. str. An identification key of Bidessodes s. str. species, modified from Young (1986), is provided.

scholarly journals Malpighiaceae Juss. in the Upper Paraná River Floodplain, States of Paraná and Mato Grosso do Sul, Brazil

Hoehnea ◽  
2020 ◽  
Vol 47 ◽  
Author(s):  
Ricardo Pacifico ◽  
Rafael Felipe de Almeida
Keyword(s):  
Paraná River ◽  
Mato Grosso ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Distribution And Ecology ◽  
Paraná River Floodplain ◽  
First Time ◽  
Mato Grosso Do Sul

ABSTRACT We present a taxonomic treatment for Malpighiaceae Juss. from the Upper Paraná River floodplain, Brazil, where 20 species in 12 genera were recognized. An identification key, morphological descriptions, photo plates, and comments on distribution and ecology of the species are provided. Tetrapterys xylosteifolia is recorded for the first time in both Paraná and Mato Grosso do Sul States in Brazil.

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