Exploring the role of climatic niche changes in the evolution of the southern South American genus Baripus (Coleoptera: Carabidae): optimization of non‐hereditary climatic variables and phylogenetic signal measurement

Cladistics ◽  
2021 ◽  
Author(s):  
Federico A. Agrain ◽  
Cecilia M. Domínguez ◽  
Rodolfo Carrara ◽  
Mariana Griotti ◽  
Sergio A. Roig‐Juñent
Keyword(s):  
Phylogenetic Signal ◽  
Climatic Variables ◽  
South American ◽  
Climatic Niche ◽  
Signal Measurement

scholarly journals Climatic niche breadths of the Atlantic Forest snakes do not increase with increasing latitude

2021 ◽  
Author(s):  
José Thales da Motta Portillo ◽  
Fausto Erritto Barbo ◽  
Ricardo J Sawaya
Keyword(s):  
Atlantic Forest ◽  
Phylogenetic Signal ◽  
Generalized Least Squares ◽  
Niche Conservatism ◽  
General View ◽  
South American ◽  
Climatic Niche ◽  
Trade Off ◽  
Phylogenetic Niche Conservatism ◽  
Temperature And Precipitation

Abstract The climatic niche is a central concept for understanding species distribution, with current and past climate interpreted as strong drivers of present and historical geographical ranges. Our aim is to understand whether Atlantic Forest snakes follow the general geographical pattern of increasing species climatic niche breadths with increasing latitude. We also tested if there is a trade-off between temperature and precipitation niche breadths of species in order to understand if species with larger breadths of one niche dimension have stronger dispersal constraints by the other due to narrower niche breadths. Niche breadths were calculated by the subtraction of maximal and minimal values of temperature and precipitation across species ranges. We implemented Phylogenetic Generalized Least Squares (PGLS) to measure the relationship between temperature and precipitation niche breadths and latitude. We also tested phylogenetic signals by Lambda statistics to analyze the degree of phylogenetic niche conservatism to both niche dimensions. Temperature niche breadths were not related to latitude. Precipitation niche breadths decreased with increasing latitude and presented a high phylogenetic signal, i.e. significant phylogenetic niche conservatism. We rejected the trade-off hypotheses of temperature and precipitation niche breadths. Our results also indicate that precipitation should be an important ecological constraint affecting the geographical distribution of snake lineages across the South American Atlantic Forest. We then provide a general view of how phylogenetic niche conservatism could impact the patterns of latitudinal variation of climatic niches across this biodiversity hotspot.

SINE-B1 Distribution and Chromosome Rearrangements in the South American Proechimys gr. goeldii (Echimyidae, Rodentia)

2021 ◽  
pp. 1-8
Author(s):  
Naiara P. Araújo ◽  
Radarane S. Sena ◽  
Cibele R. Bonvicino ◽  
Gustavo C.S. Kuhn ◽  
Marta Svartman
Keyword(s):  
Transposable Element ◽  
Genome Evolution ◽  
Significant Role ◽  
Sex Chromosomes ◽  
Chromosomal Rearrangements ◽  
Evolutionary Relationship ◽  
Chromosome Rearrangements ◽  
South American ◽  
Gross Chromosomal Rearrangements

<i>Proechimys</i> species are remarkable for their extensive chromosome rearrangements, representing a good model to understand genome evolution. Herein, we cytogenetically analyzed 3 different cytotypes of <i>Proechimys</i> gr. <i>goeldii</i> to assess their evolutionary relationship. We also mapped the transposable element SINE-B1 on the chromosomes of <i>P.</i> gr. <i>goeldii</i> in order to investigate its distribution among individuals and evaluate its possible contribution to karyotype remodeling in this species. SINE-B1 showed a dispersed distribution along chromosome arms and was also detected at the pericentromeric regions of some chromosomes, including pair 1 and the sex chromosomes, which are involved in chromosome rearrangements. In addition, we describe a new cytotype for <i>P.</i> gr. <i>goeldii</i>, reinforcing the significant role of gross chromosomal rearrangements during the evolution of the genus. The results of FISH with SINE-B1 suggest that this issue should be more deeply investigated for a better understanding of its role in the mechanisms involved in the wide variety of <i>Proechimys</i> karyotypes.

scholarly journals Links between plant species’ spatial and temporal responses to a warming climate

2014 ◽  
Vol 281 (1779) ◽  
pp. 20133017 ◽  
Author(s):  
Tatsuya Amano ◽  
Robert P. Freckleton ◽  
Simon A. Queenborough ◽  
Simon W. Doxford ◽  
Richard J. Smithers ◽  
...  
Keyword(s):  
Species Distribution Models ◽  
Range Shifts ◽  
Niche Conservatism ◽  
Historical Records ◽  
Perennial Species ◽  
Distribution Models ◽  
Climatic Niche ◽  
Warming Climate ◽  
Phenological Changes

To generate realistic projections of species’ responses to climate change, we need to understand the factors that limit their ability to respond. Although climatic niche conservatism, the maintenance of a species’s climatic niche over time, is a critical assumption in niche-based species distribution models, little is known about how universal it is and how it operates. In particular, few studies have tested the role of climatic niche conservatism via phenological changes in explaining the reported wide variance in the extent of range shifts among species. Using historical records of the phenology and spatial distribution of British plants under a warming climate, we revealed that: (i) perennial species, as well as those with weaker or lagged phenological responses to temperature, experienced a greater increase in temperature during flowering (i.e. failed to maintain climatic niche via phenological changes); (ii) species that failed to maintain climatic niche via phenological changes showed greater northward range shifts; and (iii) there was a complementary relationship between the levels of climatic niche conservatism via phenological changes and range shifts. These results indicate that even species with high climatic niche conservatism might not show range shifts as instead they track warming temperatures during flowering by advancing their phenology.

Origin and dynamics of the northern South American coastal savanna belt during the Holocene – the role of climate, sea-level, fire and humans

2015 ◽  
Vol 122 ◽  
pp. 51-62 ◽  
Author(s):  
Kamaleddin Alizadeh ◽  
Marcelo Cohen ◽  
Hermann Behling
Keyword(s):  
Sea Level ◽  
South American ◽  
The Holocene

The mediating role of self-esteem on the relationship between perceived discrimination and mental health in South American immigrants in Chile

2019 ◽  
Vol 271 ◽  
pp. 187-194 ◽  
Author(s):  
Alfonso Urzúa ◽  
Carlos Cabrera ◽  
Carlos Calderón Carvajal ◽  
Alejandra Caqueo-Urízar
Keyword(s):  
Mental Health ◽  
Perceived Discrimination ◽  
Self Esteem ◽  
South American ◽  
Mediating Role ◽  
The Relationship

Modelling the role of Atlantic air-sea interaction in the impact of Madden-Julian Oscillation on South American climate

2018 ◽  
Vol 39 (2) ◽  
pp. 1104-1116 ◽  
Author(s):  
Marcelo Barreiro ◽  
Lina Sitz ◽  
Santiago de Mello ◽  
Ramon Fuentes Franco ◽  
Madeleine Renom ◽  
...  
Keyword(s):  
South American ◽  
Madden Julian Oscillation ◽  
The Impact ◽  
South American Climate

scholarly journals Almacenamiento energético frente al inminente paradigma renovable: el rol de las baterías ion-litio y las perspectivas sudamericanas/Energy storage towards the imminent renewable paradigm: the role of ion-lithium batteries and South American perspectives

2018 ◽  
pp. 108-132 ◽  
Author(s):  
Martin Ariel Kazimierski
Keyword(s):  
Electric Propulsion ◽  
Fossil Fuels ◽  
Lithium Ion ◽  
Energy System ◽  
South American ◽  
Potential Market ◽  
Wide Range ◽  
New Energy ◽  
A Current

El actual sistema energético mundial se caracteriza por una alta dependencia de los combustibles fósiles, un paradigma que empieza a encontrar dificultades en tanto se agotan las reservas existentes y aumentan los costos ecológicos. Así, la incorporación de energías renovables, su generación en forma distribuida y el crecimiento del parque automotor eléctrico, se presentan como la triada más prometedora en la conformación de un nuevo paradigma más eficiente y sustentable. Este artículo se centra en la importancia que adquieren los acumuladores energéticos ante este panorama, principalmente por su rol en la estabilización de las redes y posibilitar el autoconsumo y la propulsión eléctrica. Identifica en las baterías de ion-litio un abanico de posibilidades para Sudamérica, que posee las reservas más importantes de litio en el mundo, incorporando la idea del desarrollo dentro del nuevo patrón energético y en un mercado actual y potencial de grandes dimensiones. Abstract The current global energy system is characterized by a high dependence on fossil fuels, a paradigm that begins to encounter difficulties as existing reserves are depleted and ecological costs increase. Thus, the incorporation of renewable energies, their generation in a distributed form and the growth of the electric motor park, are presented as the most promising triad in the conformation of a new, more efficient and sustainable paradigm. This article focuses on the importance that energy accumulators acquire in this scenario, mainly due to their role in stabilizing networks and enabling self-consumption and electric propulsion. It identifies lithium-ion batteries with a wide range of possibilities for South America, which has the most important reserves of lithium in the world, incorporating the idea of ​​development within the new energy pattern and in a current and potential market of large dimensions.

Slavery, Resistance(s) and Abolition in Early Nineteenth-Century Chile

2019 ◽  
Vol 4 (3) ◽  
pp. 372-403 ◽  
Author(s):  
Thomas Mareite
Keyword(s):  
Nineteenth Century ◽  
South American ◽  
Early Nineteenth Century ◽  
Slave Emancipation ◽  
Proactive Role

Abstract Chile’s abolition of slavery (1823) has commonly been framed within a self-congratulatory narrative that emphasizes the philanthropic role of republican elites and the peaceful nature of slave emancipation. The traditional narrative not only views abolition as an ideologically inspired gift from the elites, but also underscores Chile’s exceptionalism vis-à-vis other South American emancipation processes—in Chile, unlike in the rest of the continent, the eradication of slavery was supposedly both politically and socially insignificant. This article challenges two of this narrative’s assumptions: first, that consensus characterized the abolition of slavery in Chile, and second, that abolition was simply a philanthropic concession from the new nation’s republican elites. Instead, this study highlights how officials, slaveholders and enslaved people transformed slavery and its dismantlement into a contested issue. It also explores the proactive role that enslaved people played in undermining the institution of slavery throughout Chile, ultimately leading to its abolition.

Niche conservatism predominates in adaptive radiation: comparing the diversification of Hawaiian arthropods using ecological niche modelling

2019 ◽  
Vol 127 (2) ◽  
pp. 479-492 ◽  
Author(s):  
Anna E Hiller ◽  
Michelle S Koo ◽  
Kari R Goodman ◽  
Kerry L Shaw ◽  
Patrick M O’Grady ◽  
...  
Keyword(s):  
Adaptive Radiation ◽  
Phylogenetic Signal ◽  
Niche Overlap ◽  
Oceanic Islands ◽  
Niche Conservatism ◽  
Environmental Niche ◽  
Niche Modelling ◽  
Closely Related Species ◽  
Species Comparisons

Abstract The role of the environmental niche in fostering ecological divergence during adaptive radiation remains enigmatic. In this study, we examine the interplay between environmental niche divergence and conservatism in the context of adaptive radiation on oceanic islands, by characterizing the niche breadth of four Hawaiian arthropod radiations: Tetragnatha spiders (Tetragnathidae Latreille, 1804), Laupala crickets (Gryllidae Otte, 1994), a clade of Drosophila flies (Drosophilidae Fallén, 1823) and Nesosydne planthoppers (Delphacidae Kirkaldy, 1907). We assembled occurrence datasets for the four lineages, modelled their distributions and quantified niche overlap. All four groups occupy the islands in distinct ways, highlighting the contrasting axes of diversification for different lineages. Laupala and Nesosydne have opposite environmental niche extents (broad and narrow, respectively), whereas Tetragnatha and Drosophila share relatively intermediate tolerances. Temperature constrains the distributions of all four radiations. Tests of phylogenetic signal suggest that, for Tetragnatha and Drosophila, closely related species exhibit similar environmental niches; thus, diversification is associated with niche conservatism. Sister species comparisons also show that populations often retain similar environmental tolerances, although exceptions do occur. Results imply that diversification does not occur through ecological speciation; instead, adaptive radiation occurs largely within a single environment.

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