scholarly journals Latitude, elevational climatic zonation and speciation in New World vertebrates

2011 ◽  
Vol 279 (1726) ◽  
pp. 194-201 ◽  
Author(s):  
Carlos Daniel Cadena ◽  
Kenneth H. Kozak ◽  
Juan Pablo Gómez ◽  
Juan Luis Parra ◽  
Christy M. McCain ◽  
...  
Keyword(s):  
New World ◽  
Climatic Variation ◽  
Temperate Zone ◽  
Sister Species ◽  
Tropical Species ◽  
Biodiversity Hotspots ◽  
Tropical Mountains ◽  
Evolutionary Conservatism ◽  
The Tropics

Many biodiversity hotspots are located in montane regions, especially in the tropics. A possible explanation for this pattern is that the narrow thermal tolerances of tropical species and greater climatic stratification of tropical mountains create more opportunities for climate-associated parapatric or allopatric speciation in the tropics relative to the temperate zone. However, it is unclear whether a general relationship exists among latitude, climatic zonation and the ecology of speciation. Recent taxon-specific studies obtained different results regarding the role of climate in speciation in tropical versus temperate areas. Here, we quantify overlap in the climatic distributions of 93 pairs of sister species of mammals, birds, amphibians and reptiles restricted to either the New World tropics or to the Northern temperate zone. We show that elevational ranges of tropical- and temperate-zone species do not differ from one another, yet the temperature range experienced by species in the temperate zone is greater than for those in the tropics. Moreover, tropical sister species tend to exhibit greater similarity in their climatic distributions than temperate sister species. This pattern suggests that evolutionary conservatism in the thermal niches of tropical taxa, coupled with the greater thermal zonation of tropical mountains, may result in increased opportunities for allopatric isolation, speciation and the accumulation of species in tropical montane regions. Our study exemplifies the power of combining phylogenetic and spatial datasets of global climatic variation to explore evolutionary (rather than purely ecological) explanations for the high biodiversity of tropical montane regions.

scholarly journals Losses of female song with changes from tropical to temperate breeding in the New World blackbirds

2009 ◽  
Vol 276 (1664) ◽  
pp. 1971-1980 ◽  
Author(s):  
J. Jordan Price ◽  
Scott M. Lanyon ◽  
Kevin E. Omland
Keyword(s):  
Sexual Selection ◽  
New World ◽  
Female Song ◽  
Complex Song ◽  
Evolutionary Changes ◽  
Apparent Relationship ◽  
Song Production ◽  
Selection For ◽  
The Tropics

Birds in which both sexes produce complex songs are thought to be more common in the tropics than in temperate areas, where typically only males sing. Yet the role of phylogeny in this apparent relationship between female song and latitude has never been examined. Here, we reconstruct evolutionary changes in female song and breeding latitude in the New World blackbirds (Icteridae), a family with both temperate and tropical representatives. We provide strong evidence that members of this group have moved repeatedly from tropical to temperate breeding ranges and, furthermore, that these range shifts were associated with losses of female song more often than expected by chance. This historical perspective suggests that male-biased song production in many temperate species is the result not of sexual selection for complex song in males but of selection against such songs in females. Our results provide new insights into the differences we see today between tropical and temperate songbirds, and suggest that the role of sexual selection in the evolution of bird song might not be as simple as we think.

Evolutionary conservatism will limit responses to climate change in the tropics

2021 ◽  
Vol 17 (10) ◽  
Author(s):  
Ethan B. Linck ◽  
Benjamin G. Freeman ◽  
C. Daniel Cadena ◽  
Cameron K. Ghalambor
Keyword(s):  
Thermal Tolerance ◽  
Species Turnover ◽  
Tropical Species ◽  
Evolutionary Divergence ◽  
Closely Related Species ◽  
Tropical Mountains ◽  
Low Latitudes ◽  
Parapatric Speciation ◽  
The Tropics

Rapid species turnover in tropical mountains has fascinated biologists for centuries. A popular explanation for this heightened beta diversity is that climatic stability at low latitudes promotes the evolution of narrow thermal tolerance ranges, leading to local adaptation, evolutionary divergence and parapatric speciation along elevational gradients. However, an emerging consensus from research spanning phylogenetics, biogeography and behavioural ecology is that this process rarely, if ever, occurs. Instead, closely related species typically occupy a similar elevational niche, while species with divergent elevational niches tend to be more distantly related. These results suggest populations have responded to past environmental change not by adapting and diverging in place, but instead by shifting their distributions to tightly track climate over time. We argue that tropical species are likely to respond similarly to ongoing and future climate warming, an inference supported by evidence from recent range shifts. In the absence of widespread in situ adaptation to new climate regimes by tropical taxa, conservation planning should prioritize protecting large swaths of habitat to facilitate movement.

scholarly journals Niche-tracking migrants and niche-switching residents: evolution of climatic niches in New World warblers (Parulidae)

2016 ◽  
Vol 283 (1824) ◽  
pp. 20152458 ◽  
Author(s):  
Camila Gómez ◽  
Elkin A. Tenorio ◽  
Paola Montoya ◽  
Carlos Daniel Cadena
Keyword(s):  
New World ◽  
Niche Overlap ◽  
Climatic Conditions ◽  
Tropical Species ◽  
Migratory Behaviour ◽  
Niche Evolution ◽  
Climatic Niche ◽  
Niche Dynamics ◽  
Patterns And Processes ◽  
The Tropics

Differences in life-history traits between tropical and temperate lineages are often attributed to differences in their climatic niche dynamics. For example, the more frequent appearance of migratory behaviour in temperate-breeding species than in species originally breeding in the tropics is believed to have resulted partly from tropical climatic stability and niche conservatism constraining tropical species from shifting their ranges. However, little is known about the patterns and processes underlying climatic niche evolution in migrant and resident animals. We evaluated the evolution of overlap in climatic niches between seasons and its relationship to migratory behaviour in the Parulidae, a family of New World passerine birds. We used ordination methods to measure seasonal niche overlap and niche breadth of 54 resident and 49 migrant species and used phylogenetic comparative methods to assess patterns of climatic niche evolution. We found that despite travelling thousands of kilometres, migrants tracked climatic conditions across the year to a greater extent than tropical residents. Migrant species had wider niches than resident species, although residents as a group occupied a wider climatic space and niches of migrants and residents overlapped extensively. Neither breeding latitude nor migratory distance explained variation among species in climatic niche overlap between seasons. Our findings support the notion that tropical species have narrower niches than temperate-breeders, but does not necessarily constrain their ability to shift or expand their geographical ranges and become migratory. Overall, the tropics may have been historically less likely to experience the suite of components that generate strong selection pressures for the evolution of migratory behaviour.

scholarly journals Humboldt’s enigma: What causes global patterns of mountain biodiversity?

Science ◽  
2019 ◽  
Vol 365 (6458) ◽  
pp. 1108-1113 ◽  
Author(s):  
Carsten Rahbek ◽  
Michael K. Borregaard ◽  
Robert K. Colwell ◽  
Bo Dalsgaard ◽  
Ben G. Holt ◽  
...  
Keyword(s):  
Land Use ◽  
Global Changes ◽  
Mountain Regions ◽  
Land Area ◽  
Tropical Mountains ◽  
Global Patterns ◽  
Terrestrial Biodiversity ◽  
The Tropics ◽  
Climatic Characteristics

Mountains contribute disproportionately to the terrestrial biodiversity of Earth, especially in the tropics, where they host hotspots of extraordinary and puzzling richness. With about 25% of all land area, mountain regions are home to more than 85% of the world’s species of amphibians, birds, and mammals, many entirely restricted to mountains. Biodiversity varies markedly among these regions. Together with the extreme species richness of some tropical mountains, this variation has proven challenging to explain under traditional climatic hypotheses. However, the complex climatic characteristics of rugged mountain regions differ fundamentally from those of lowland regions, likely playing a key role in generating and maintaining diversity. With ongoing global changes in climate and land use, the role of mountains as refugia for biodiversity may well come under threat.

Scriptural Battlefields: The Old Testament, Legal Culture, and the Polemics of the Spanish New World Empire, 1492–1821

2019 ◽  
Author(s):  
Jorge Cañizares-Esguerra ◽  
Adrian Masters
Keyword(s):  
Old Testament ◽  
Social Order ◽  
New World ◽  
Legal Culture ◽  
Spanish Empire ◽  
Correct Interpretation ◽  
Group Status ◽  
History Of ◽  
New Social Order

Scholars have barely begun to explore the role of the Old Testament in the history of the Spanish New World. And yet this text was central for the Empire’s legal thought, playing a role in its legislation, adjudication, and understandings of group status. Institutions like the Council of the Indies, the Inquisition, and the monarchy itself invited countless parallels to ancient Hebrew justice. Scripture influenced how subjects understood and valued imperial space as well as theories about Paradise or King Solomon’s mines of Ophir. Scripture shaped debates about the nature of the New World past, the legitimacy of the conquest, and the questions of mining, taxation, and other major issues. In the world of privilege and status, conquerors and pessimists could depict the New World and its peoples as the antithesis of Israel and the Israelites, while activists, patriots, and women flipped the script with aplomb. In the readings of Indians, American-born Spaniards, nuns, and others, the correct interpretation of the Old Testament justified a new social order where these groups’ supposed demerits were in reality their virtues. Indeed, vassals and royal officials’ interpretations of the Old Testament are as diverse as the Spanish Empire itself. Scripture even outlasted the Empire. As republicans defeated royalists in the nineteenth century, divergent readings of the book, variously supporting the Israelite monarchy or the Hebrew republic, had their day on the battlefield itself.

Non-native poeciliids in hot water: the role of thermal springs in facilitating invasion of tropical species

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Quenton M. Tuckett ◽  
Katelyn M. Lawson ◽  
Taylor N. Lipscomb ◽  
Jeffrey E. Hill ◽  
Wesley M. Daniel ◽  
...  
Keyword(s):  
Hot Water ◽  
Thermal Springs ◽  
Tropical Species

Introgression between non-sister species of honeyeaters (Aves: Meliphagidae) several million years after speciation

2019 ◽  
Vol 128 (3) ◽  
pp. 583-591
Author(s):  
Leo Joseph ◽  
Alex Drew ◽  
Ian J Mason ◽  
Jeffrey L Peters
Keyword(s):  
Gene Flow ◽  
Reproductive Isolation ◽  
Sex Chromosomes ◽  
Common Ancestor ◽  
Sister Species ◽  
Species Boundaries ◽  
North Eastern ◽  
The City

Abstract We reassessed whether two parapatric non-sister Australian honeyeater species (Aves: Meliphagidae), varied and mangrove honeyeaters (Gavicalis versicolor and G. fasciogularis, respectively), that diverged from a common ancestor c. 2.5 Mya intergrade in the Townsville area of north-eastern Queensland. Consistent with a previous specimen-based study, by using genomics methods we show one-way gene flow for autosomal but not Z-linked markers from varied into mangrove honeyeaters. Introgression barely extends south of the area of parapatry in and around the city of Townsville. While demonstrating the long-term porosity of species boundaries over several million years, our data also suggest a clear role of sex chromosomes in maintaining reproductive isolation.

scholarly journals Evaluating the role of contracting and expanding rainforest in initiating cycles of speciation across the Isthmus of Panama

2012 ◽  
Vol 279 (1742) ◽  
pp. 3520-3526 ◽  
Author(s):  
Brian Tilston Smith ◽  
Amei Amei ◽  
John Klicka
Keyword(s):  
Bird Species ◽  
Tropical Regions ◽  
Isthmus Of Panama ◽  
Species Pairs ◽  
The Matrix ◽  
High Species Richness ◽  
The Rich ◽  
The Tropics ◽  
The Impact

Climatic and geological changes across time are presumed to have shaped the rich biodiversity of tropical regions. However, the impact climatic drying and subsequent tropical rainforest contraction had on speciation has been controversial because of inconsistent palaeoecological and genetic data. Despite the strong interest in examining the role of climatic change on speciation in the Neotropics there has been few comparative studies, particularly, those that include non-rainforest taxa. We used bird species that inhabit humid or dry habitats that dispersed across the Panamanian Isthmus to characterize temporal and spatial patterns of speciation across this barrier. Here, we show that these two assemblages of birds exhibit temporally different speciation time patterns that supports multiple cycles of speciation. Evidence for these cycles is further corroborated by the finding that both assemblages consist of ‘young’ and ‘old’ species, despite dry habitat species pairs being geographically more distant than pairs of humid habitat species. The matrix of humid and dry habitats in the tropics not only allows for the maintenance of high species richness, but additionally this study suggests that these environments may have promoted speciation. We conclude that differentially expanding and contracting distributions of dry and humid habitats was probably an important contributor to speciation in the tropics.

Latin American Cities: Aspects of Function and Structure

1962 ◽  
Vol 4 (4) ◽  
pp. 473-493 ◽  
Author(s):  
Richard M. Morse
Keyword(s):  
Latin American ◽  
New World ◽  
American City ◽  
American Cities ◽  
The City

This essay will advance two interrelated hypotheses about the Latin American city. The first of them has to do with the role of the city in the settlement of the New World. The second suggests certain characteristics of the modern Latin American metropolis.

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