scholarly journals Stochastic dispersal increases the rate of upstream spread: A case study with green crabs on the northwest Atlantic coast

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0185671 ◽  
Author(s):  
Ali Gharouni ◽  
Myriam A. Barbeau ◽  
Joël Chassé ◽  
Lin Wang ◽  
James Watmough
2021 ◽  
Vol 447 ◽  
pp. 109510
Author(s):  
Hanane Rhomad ◽  
Karima Khalil ◽  
Ramiro Neves ◽  
Blaid Bougadir ◽  
Khalid Elkalay

2012 ◽  
Vol 15 (4) ◽  
pp. 36-59 ◽  
Author(s):  
Esther Jean Langdon ◽  
Isabel Santana de Rose

This paper is a reflection on the ritual incorporation of ayahuasca, an Amazonian psychoactive ritual substance, by members of a Guarani Indian village on the Atlantic coast of the state of Santa Catarina, Brazil. Their shamanic leaders have adapted the use of this beverage into their ritual practices and recognize it as part of their culture and tradition. This process of appropriation is a result of the formation of a network that involves various actors, among them the Guarani Indians, members of Sacred Fire of Itzachilatlan, followers of the Brazilian ayahuasca religion Santo Daime, and a health team employed to provide primary attention to Indian communities. Based on this case study, we demonstrate that shamanisms today emerge out of specific political and historic contexts. If the concept of shamanism is useful as an analytical paradigm, it must be thought of as a dialogical category constructed through interaction between actors with diverse origins, discourses, and interests.


2006 ◽  
Vol 52 (11) ◽  
pp. 1406-1413 ◽  
Author(s):  
C. Quintaneiro ◽  
M. Monteiro ◽  
R. Pastorinho ◽  
A.M.V.M. Soares ◽  
A.J.A. Nogueira ◽  
...  

2017 ◽  
Author(s):  
A. Gharouni ◽  
M.A. Barbeau ◽  
J. Chassé ◽  
L. Wang ◽  
J. Watmough

AbstractDispersal heterogeneity is an important process that can compensate for downstream advection, enabling aquatic organisms to persist or spread upstream. Our main focus was the effect of year-to-year variation in larval dispersal on invasion spread rate. We used the green crab, Carcinus maenas, as a case study. This species was first introduced over 200 years ago to the east coast of North America, and once established has maintained a relatively consistent spread rate against the dominant current. We used a stage-structured, integro-difference equation model that couples a demographic matrix for population growth and dispersal kernels for spread of individuals within a season. The kernel describing larval dispersal, the main dispersive stage, was mechanistically modeled to include both drift and settlement rate components. It was parameterized using a 3-dimensional hydrodynamic model of the Gulf of St Lawrence, which enabled us to incorporate larval behavior, namely vertical swimming. Dispersal heterogeneity was modeled at two temporal scales: within the larval period (months) and over the adult lifespan (years). The kernel models variation within the larval period. To model the variation among years, we allowed the kernel parameters to vary by year. Results indicated that when dispersal parameters vary with time, knowledge of the time-averaged dispersal process is insufficient for determining the upstream spread rate of the population. Rather upstream spread is possible over a number of years when incorporating the yearly variation, even when there are only a few “good years” featured by some upstream dispersal among many “bad years” featured by only downstream dispersal. Accounting for annual variations in dispersal in population models is important to enhance understanding of spatial dynamics and population spread rates. Our developed model also provides a good platform to link the modeling of larval behavior and demography to large-scale hydrodynamic models.


Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2113
Author(s):  
Ryan Emanuel ◽  
David Wilkins

Indigenous peoples worldwide face barriers to participation in water governance, which includes planning and permitting of infrastructure that may affect water in their territories. In the United States, the extent to which Indigenous voices are heard—let alone incorporated into decision-making—depends heavily on whether or not Native nations are recognized by the federal government. In the southeastern United States, non-federally recognized Indigenous peoples continue to occupy their homelands along rivers, floodplains, and wetlands. These peoples, and the Tribal governments that represent them, rarely enter environmental decision-making spaces as sovereign nations and experts in their own right. Nevertheless, plans to construct the Atlantic Coast Pipeline prompted non-federally recognized Tribes to demand treatment as Tribal nations during permitting. Actions by the Tribes, which are recognized by the state of North Carolina, expose barriers to participation in environmental governance faced by Indigenous peoples throughout the United States, and particularly daunting challenges faced by state-recognized Tribes. After reviewing the legal and political landscapes that Native nations in the United States must navigate, we present a case study focused on Atlantic Coast Pipeline planning and permitting. We deliberately center Native voices and perspectives, often overlooked in non-Indigenous narratives, to emphasize Indigenous actions and illuminate participatory barriers. Although the Atlantic Coast Pipeline was cancelled in 2020, the case study reveals four enduring barriers to Tribal participation: adherence to minimum standards, power asymmetries, procedural narrowing, and “color-blind” planning. We conclude by highlighting opportunities for federal and state governments, developers, and Indigenous peoples to breach these barriers.


Author(s):  
Youssef Benmoussa ◽  
Abdelaalim Mabrouki ◽  
Sara Berrada ◽  
Idriss Azhari ◽  
Yassine Salih-Alj

2021 ◽  
Vol 169 ◽  
pp. 112490
Author(s):  
Umberto Andriolo ◽  
Gil Gonçalves ◽  
Paula Sobral ◽  
Filipa Bessa

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