scholarly journals The role of the south-western Alps as a unidirectional corridor for Mediterranean brown trout (Salmo trutta complex) lineages

2020 ◽  
Vol 131 (4) ◽  
pp. 909-926
Author(s):  
Andrea Splendiani ◽  
Patrick Berrebi ◽  
Christelle Tougard ◽  
Tommaso Righi ◽  
Nathalie Reynaud ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Spatial Distribution ◽  
River Basin ◽  
Salmo Trutta ◽  
Western Alps ◽  
Molecular Dating ◽  
The South ◽  
The Mediterranean ◽  
Mediterranean Trout

Abstract The role of the south-western Alps as a corridor for Mediterranean trout (Salmo trutta complex Linnaeus, 1758) was evaluated in order to understand the influence of the last glacial events in shaping the spatial distribution of the genetic diversity of this salmonid. For this, the allochthonous hypothesis of a man-mediated French origin (19th century) of the Mediterranean trout inhabiting the Po tributaries in the Italian side of the south-western Alps was tested. A total of 412 individuals were analysed at the mitochondrial control region. The phylogenetic classification was carried out by using a Median-Joining Network analysis. Mismatch pair-wise analysis, molecular dating and Kernel density distribution analysis of the main mitochondrial lineages were evaluated to compare past demographic dynamics with the current spatial distribution of genetic diversity. The main outcomes resulted strongly in agreement with a biogeographic scenario where the south-western Alps acted as a unidirectional corridor that permitted the colonization of the upper Durance (Rhône River basin) by trout from the Po River basin. Therefore, the Mediterranean trout should be considered as native also along the Italian side of the south-western Alps and the allochthonous hypothesis should be rejected.

Sociotenurial Polarisation in London and the South East: A Reply to Berge's Comments

1989 ◽  
Vol 21 (4) ◽  
pp. 545-548 ◽  
Author(s):  
C Hamnett
Keyword(s):  
Spatial Distribution ◽  
Housing Market ◽  
Social Groups ◽  
The South

It is argued in this paper that Berge's valuable reanalysis of my data generally supports, rather than contradicts, my conclusions regarding social and tenurial change in the South East. His use of indices of overrepresentation and underrepresentation points to the central role of the housing market in shaping the spatial distribution of different social groups. Although he shows that professionals and managers became slightly less proportionately overrepresented in owner occupation, some of Berge's interpretations of his tables are questioned.

scholarly journals Mixed Variational-Monte Carlo Assimilation of Streamflow Data in Flood Forecasting: the Impact of Observations Spatial Distribution

10.29007/39wq ◽  
2018 ◽  
Author(s):  
Giulia Ercolani ◽  
Fabio Castelli
Keyword(s):  
Monte Carlo ◽  
Spatial Distribution ◽  
River Basin ◽  
Flood Forecasting ◽  
Hydrologic Model ◽  
Variational Monte Carlo ◽  
Distributed Hydrologic Model ◽  
Streamflow Data ◽  
The Impact

A mixed variational-Monte Carlo scheme is employed to assimilate streamflow data at multiple locations in a distributed hydrologic model for flood forecasting purposes. The goal of this work is to assess the role of the spatial distribution of the assimilation points in terms of forecasts accuracy. The area of study is Arno river basin, and the strategy of investigation is to focus on one single nearly-flood event, performing various assimilation experiments that differ only in number and location of the assimilation sites.

scholarly journals Ecology and conservation of the Mediterranean trout in the central Apennines (Italy)

2018 ◽  
Vol 78 (1) ◽  
Author(s):  
Massimo Lorenzoni ◽  
Antonella Carosi ◽  
Massimo Giovannotti ◽  
Gianandrea La Porta ◽  
Andrea Splendiani ◽  
...  
Keyword(s):  
Salmo Trutta ◽  
Management Strategies ◽  
Fish Fauna ◽  
Demographic Characteristics ◽  
Environmental Data ◽  
Adult Density ◽  
Central Apennines ◽  
Native Populations ◽  
The Mediterranean ◽  
Mediterranean Trout

The Mediterranean brown trout (Salmo trutta complex) is one of the freshwater fish species complex at greater risk of extinction in the Mediterranean area. The introduction of alien invasive species and their interaction with the native fauna represent some of the major threats to the survival of this species. Currently, the genetic variability of the Mediterranean trout (Salmo trutta complex) is being compromised by the introgressive hybridization with the Atlantic trout (Salmo trutta Linnaeus, 1758). Therefore, it is necessary to gain further knowledge on genetic and demographic characteristics of Mediterranean trout populations, that, combined with environmental and angling data, will allow to undertake sound conservation strategies. The aims of the present study were to analyze: i) the demographic characteristics of the Mediterranean trout in seven central Apennine river basins where native populations are threatened by stocking with the domestic trout of north Atlantic origin; ii) the influence of both environmental parameters and different fishery management strategies on the status of native trout populations. The project focuses on 14 sites included in the Natura 2000 EU wide network of nature protection areas, established under the 1992 Habitat Directive. A total of 25 watercourses were investigated for a total of 32 sampling sites. A census of the fish fauna was carried out by electrofishing at each sampling location. Fish and environmental data were collected in spring and autumn 2014. The results obtained in the present research allowed us to detect the presence of three residual Mediterranean trout populations with a high degree of genetic integrity in the study area. The native trout populations were characterized by higher abundances and higher adult density values. Well-structured native populations with higher legal-size specimens density and poor body conditions in terms of relative weight were observed in the no-fishing areas, probably due to the presence of intraspecific competition phenomena. The environmental analysis confirmed the key role played by the geological characteristics of the central Apennines in shaping the introgression levels observed in the wild trout populations, while the recovery of the water quality appears decisive in the development of management strategies aimed at their conservation.

Genetic diversity of Oecomys (Rodentia, Sigmodontinae) from the Tapajós River basin and the role of rivers as barriers for the genus in the region

2019 ◽  
Vol 97 ◽  
pp. 41-49 ◽  
Author(s):  
Juliane Saldanha ◽  
Daniela Cristina Ferreira ◽  
Victor Fonsêca da Silva ◽  
Manoel Santos-Filho ◽  
Ana Cristina Mendes-Oliveira ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
River Basin

Crossing the Pomerium

2020 ◽  
Author(s):  
Michael Koortbojian
Keyword(s):  
Social Practices ◽  
Civic Life ◽  
Public Monuments ◽  
Religion And Law ◽  
Mediterranean World ◽  
The Mediterranean ◽  
The Military ◽  
The City

The ancient Romans famously distinguished between civic life in Rome and military matters outside the city—a division marked by the pomerium, an abstract religious and legal boundary that was central to the myth of the city's foundation. This book explores, by means of images and texts, how the Romans used social practices and public monuments to assert their capital's distinction from its growing empire, to delimit the proper realms of religion and law from those of war and conquest, and to establish and disseminate so many fundamental Roman institutions across three centuries of imperial rule. The book probes such topics as the appearance in the city of Romans in armor, whether in representation or in life, the role of religious rites on the battlefield, and the military image of Constantine on the arch built in his name. Throughout, the book reveals how, in these instances and others, the ancient ideology of crossing the pomerium reflects the efforts of Romans not only to live up to the ideals they had inherited, but also to reconceive their past and to validate contemporary practices during a time when Rome enjoyed growing dominance in the Mediterranean world. The book explores a problem faced by generations of Romans—how to leave and return to hallowed city ground in the course of building an empire.

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