scholarly journals Independent evolution of intermediate bill widths in a seabird clade

2021 ◽  
Author(s):  
Juan F. Masello ◽  
Peter G. Ryan ◽  
Lara D. Shepherd ◽  
Petra Quillfeldt ◽  
Yves Cherel ◽  
...  
Keyword(s):  
Gene Flow ◽  
Indian Ocean ◽  
Morphological Data ◽  
Phylogenetic Position ◽  
Hybrid Speciation ◽  
Interspecific Gene Flow ◽  
History Of ◽  
The Indian Ocean ◽  
Homoploid Hybrid ◽  
Incomplete Reproductive Isolation

AbstractInterspecific introgression can occur between species that evolve rapidly within an adaptive radiation. Pachyptila petrels differ in bill size and are characterised by incomplete reproductive isolation, leading to interspecific gene flow. Salvin’s prion (Pachyptila salvini), whose bill width is intermediate between broad-billed (P. vittata) and Antarctic (P. desolata) prions, evolved through homoploid hybrid speciation. MacGillivray’s prion (P. macgillivrayi), known from a single population on St Paul (Indian Ocean), has a bill width intermediate between salvini and vittata and could also be the product of interspecies introgression or hybrid speciation. Recently, another prion population phenotypically similar to macgillivrayi was discovered on Gough (Atlantic Ocean), where it breeds 3 months later than vittata. The similarity in bill width between the medium-billed birds on Gough and macgillivrayi suggest that they could be closely related. In this study, we used genetic and morphological data to infer the phylogenetic position and evolutionary history of P. macgillivrayi and the Gough medium-billed prion relative other Pachyptila taxa, to determine whether species with medium bill widths evolved through common ancestry or convergence. We found that Gough medium-billed prions belong to the same evolutionary lineage as macgillivrayi, representing a new population of MacGillivray’s prion that originated through a colonisation event from St Paul. We show that macgillivrayi’s medium bill width evolved through divergence (genetic drift) and independently from that of salvini, which evolved through hybridisation (gene flow). This represents the independent convergence towards a similarly medium-billed phenotype. The newly discovered MacGillivray’s prion population on Gough is of utmost conservation relevance, as the relict macgillivrayi population in the Indian Ocean is very small.

Editorial Introduction

2020 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Editors of the JIOWS
Keyword(s):  
Nineteenth Century ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Late Nineteenth Century ◽  
Fourth Volume ◽  
History Of ◽  
The Indian Ocean ◽  
Complex Relationships ◽  
Indian Ocean World ◽  
Shed Light

The editors are proud to present the first issue of the fourth volume of the Journal of Indian Ocean World Studies. This issue contains three articles, by James Francis Warren (Murdoch University), Kelsey McFaul (University of California, Santa Cruz), and Marek Pawelczak (University of Warsaw), respectively. Warren’s and McFaul’s articles take different approaches to the growing body of work that discusses pirates in the Indian Ocean World, past and present. Warren’s article is historical, exploring the life and times of Julano Taupan in the nineteenth-century Philippines. He invites us to question the meaning of the word ‘pirate’ and the several ways in which Taupan’s life has been interpreted by different European colonists and by anti-colonial movements from the mid-nineteenth century to the present day. McFaul’s article, meanwhile, takes a literary approach to discuss the much more recent phenomenon of Somali Piracy, which reached its apex in the last decade. Its contribution is to analyse the works of authors based in the region, challenging paradigms that have mostly been developed from analysis of works written in the West. Finally, Pawelczak’s article is a legal history of British jurisdiction in mid-late nineteenth-century Zanzibar. It examines one of the facets that underpinned European influence in the western Indian Ocean World before the establishment of colonial rule. In sum, this issue uses two key threads to shed light on the complex relationships between European and other Western powers and the Indian Ocean World.

Australianama

2019 ◽  
Author(s):  
Samia Khatun
Keyword(s):  
Indian Ocean ◽  
South Asian ◽  
South Asian Diaspora ◽  
Post Cold War ◽  
Asian Diaspora ◽  
Broken Hill ◽  
History Of ◽  
The Indian Ocean ◽  
Anglophone World ◽  
Indian Ocean World

Australian deserts remain dotted with the ruins of old mosques. Beginning with a Bengali poetry collection discovered in a nineteenth-century mosque in the town of Broken Hill, Samia Khatun weaves together the stories of various peoples colonized by the British Empire to chart a history of South Asian diaspora. Australia has long been an outpost of Anglo empires in the Indian Ocean world, today the site of military infrastructure central to the surveillance of 'Muslim-majority' countries across the region. Imperial knowledges from Australian territories contribute significantly to the Islamic-Western binary of the post- Cold War era. In narrating a history of Indian Ocean connections from the perspectives of those colonized by the British, Khatun highlights alternative contexts against which to consider accounts of non-white people. Australianama challenges a central idea that powerfully shapes history books across the Anglophone world: the colonial myth that European knowledge traditions are superior to the epistemologies of the colonized. Arguing that Aboriginal and South Asian language sources are keys to the vast, complex libraries that belie colonized geographies, Khatun shows that stories in colonized tongues can transform the very ground from which we view past, present and future.

The Paving Stone Theory of World Tectonics

2018 ◽  
Author(s):  
Roy Livermore
Keyword(s):  
Indian Ocean ◽  
Plate Tectonics ◽  
Earth Science ◽  
Transform Faults ◽  
Plate Motions ◽  
Euler’S Theorem ◽  
History Of ◽  
New Ideas ◽  
Entire History ◽  
The Indian Ocean

Tuzo Wilson introduces the concept of transform faults, which has the effect of transforming Earth Science forever. Resistance to the new ideas is finally overcome in the late 1960s, as the theory of moving plates is established. Two scientists play a major role in quantifying the embryonic theory that is eventually dubbed ‘plate tectonics’. Dan McKenzie applies Euler’s theorem, used previously by Teddy Bullard to reconstruct the continents around the Atlantic, to the problem of plate rotations on a sphere and uses it to unravel the entire history of the Indian Ocean. Jason Morgan also wraps plate tectonics around a sphere. Tuzo Wilson introduces the idea of a fixed hotspot beneath Hawaii, an idea taken up by Jason Morgan to create an absolute reference frame for plate motions.

scholarly journals Molecular Signatures of Reticulate Evolution within the Complex of European Pine Taxa

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 489
Author(s):  
Bartosz Łabiszak ◽  
Witold Wachowiak
Keyword(s):  
Gene Flow ◽  
Reticulate Evolution ◽  
Modeling Framework ◽  
Closely Related Species ◽  
Interspecific Gene Flow ◽  
Nucleotide Sequence Variation ◽  
History Of ◽  
Best Fitting ◽  
Species Integrity

Speciation mechanisms, including the role of interspecific gene flow and introgression in the emergence of new species, are the major focus of evolutionary studies. Inference of taxonomic relationship between closely related species may be challenged by past hybridization events, but at the same time, it may provide new knowledge about mechanisms responsible for the maintenance of species integrity despite interspecific gene flow. Here, using nucleotide sequence variation and utilizing a coalescent modeling framework, we tested the role of hybridization and introgression in the evolutionary history of closely related pine taxa from the Pinus mugo complex and P. sylvestris. We compared the patterns of polymorphism and divergence between taxa and found a great overlap of neutral variation within the P. mugo complex. Our phylogeny reconstruction indicated multiple instances of reticulation events in the past, suggesting an important role of interspecific gene flow in the species divergence. The best-fitting model revealed P. mugo and P. uncinata as sister species with basal P. uliginosa and asymmetric migration between all investigated species after their divergence. The magnitude of interspecies gene flow differed greatly, and it was consistently stronger from representatives of P. mugo complex to P. sylvestris than in the opposite direction. The results indicate the prominent role of reticulation evolution in those forest trees and provide a genetic framework to study species integrity maintained by selection and local adaptation.

Notes on the generic position of Brassica deserti (Brassicaceae)

2019 ◽  
Vol 66 (1-2) ◽  
pp. 89-93
Author(s):  
Jotham Ziffer-Berger ◽  
Alexandra Keren-Keiserman ◽  
Adi Doron-Faigenboim ◽  
Klaus Mummenhoff ◽  
Oz Barazani
Keyword(s):  
Mediterranean Area ◽  
Morphological Data ◽  
Phylogenetic Position ◽  
Molecular Tools ◽  
East Mediterranean ◽  
Phylogenetic Groups ◽  
5.8S Rdna ◽  
The Core ◽  
Generic Position ◽  
History Of

Molecular tools provide new insights into phylogenetic relationships of plant species, and by relating phylogenetic groups to their geographical distribution, we can cast light upon the evolution history of plant clades. In the current study, we evaluated the phylogenetic position of the Sinai endemic Brassica deserti (Brassicaceae), later renamed as Erucastrum deserti, based on morphological data and 5.8S rDNA and ITS (Internal Transcribed Spacer) regions. Our results indicate that B. deserti belongs to an East-Mediterranean – Saharo Arabian clade and was not assigned to the core Brassica and Erucastrum clades, respectively, which evolved in the West Mediterranean area. We tentatively conclude that Brassica deserti evolved independently of core Brassica and Erucastrum.

scholarly journals Three new Cenomanian conifers from El Chango (Chiapas, Mexico) offer a snapshot of the geographic mosaic of the Mesozoic conifer decline

2021 ◽  
Author(s):  
Ixchel Gonzalez-Ramirez ◽  
Sergio RS Cevallos-Ferriz ◽  
Carl Rothfels
Keyword(s):  
Evolutionary History ◽  
Mixed Forest ◽  
Freshwater Ecosystems ◽  
Total Evidence ◽  
Morphological Data ◽  
Phylogenetic Position ◽  
Dominant Group ◽  
Geographic Mosaic ◽  
History Of ◽  
Rare Opportunity

Premise of study: El Chango is a recently discovered quarry that contains extremely well preserved fossils. The Cenomanian age of the locality corresponds to a time when the global flora was transitioning from gymnosperm- to angiosperm-dominated, yet conifers predominate in this locality. These fossils thus provide a rare opportunity to understand the replacement of conifers by angiosperms as the dominant group of plants. Methods: We collected material from El Chango in annual expeditions (2010 to 2014). We selected the three most abundant and best preserved conifer morphotypes and conducted a total-evidence (i.e., including molecular and morphological data) phylogenetic analysis of a sample of 72 extant conifer species plus the three fossils. We use these results to inform our taxonomic decisions. Results: We obtained four equally most-parsimonious trees (consistency index = 44.1%, retention index = 78.8%). Despite ambiguous relationships among some extant taxa, the three fossil conifers had the same phylogenetic position in all four most parsimonious trees; we describe these species as new: Sequoiadendron helicalancifolium sp. nov. (Cupressaceae), and Microcachrys rhomboidea sp. nov. and Dacrydium bifoliosus sp. nov (Podocarpaceae). The ecosystem is interpreted as a coastal humid mixed forest. Conclusions: Our findings contribute to the understanding of Cenomanian equatorialregions, and support the hypothesis of a geographically and ecologically structured rise of angiosperms, with conifers remaining dominant in brackish-water and angiosperms becoming dominant in freshwater-ecosystems. These fossils fill in gaps in the evolutionary history of lineages like Microcachrys, which we demonstrate occurred in the Northern hemisphere before becoming restricted to its current range (Tasmania).

scholarly journals Coffee: An Indian Ocean Perspective

2016 ◽  
Vol 11 (2) ◽  
pp. 61-81
Author(s):  
Shane J. Barter
Keyword(s):  
Indian Ocean ◽  
South Asia ◽  
Latin American ◽  
Eastern Africa ◽  
Coffee Production ◽  
Production And Consumption ◽  
History Of ◽  
Coffee Farmers ◽  
The Indian Ocean ◽  
Indian Ocean World

Abstract Studies of coffee production and consumption are dominated by emphases on Latin American production and American consumption. This paper challenges the Atlantic perspective, demanding an equal emphasis on the Indian Ocean world of Eastern Africa, the Middle East, South Asia, and Southeast Asia. A geographical approach to historical as well as contemporary patterns of coffee production and consumption provides an opportunity to rethink the nature of coffee as a global commodity. The Indian Ocean world has a much deeper history of coffee, and in recent decades, has witnessed a resurgence in production. The nature of this production is distinct, providing an opportunity to rethink dependency theories. Coffee in the Indian Ocean world is more likely to be produced by smallholders, countries are less likely to be economically dependent on coffee, farmers are more likely to harvest polycultures, and countries represent both consumers and producers. A balanced emphasis of Atlantic and Indian Ocean worlds allows us to better understand coffee production and consumption, together telling a more balanced, global story of this important commodity.

Gujarat in the History of the Indian Ocean

2019 ◽  
pp. 52-67
Author(s):  
Lakshmi Subramanian
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
Maritime History ◽  
Historical Knowledge ◽  
History Writing ◽  
New Methods ◽  
History Of ◽  
The Indian Ocean

This chapter takes a stock taking exercise of the history writing on Gujarat and Indian maritime history over the last five decades. It identifies the major shifts and emphases that mark the nature of historical knowledge. What these hold for the discipline of history in general and how these inflect the case study of Gujarat in particular are examined. The intention of such a stock taking exercise is also to consider the importance of recovering and reading new and local archives and of incorporating new methods into standard historical work. The author also explores the most significant shifts that have emerged in the recent historiography of the Indian Ocean and of maritime Gujarat: study of law and piracy and Muslim seafaring and sailing practices in the western Indian Ocean.

3. First forays

2015 ◽  
pp. 29-39
Author(s):  
Stewart A. Weaver
Keyword(s):  
Indian Ocean ◽  
Second Century ◽  
Bay Of Biscay ◽  
British Isles ◽  
Alexander The Great ◽  
Marco Polo ◽  
History Of ◽  
The Indian Ocean ◽  
To Come ◽  
The Silk Road

‘First forays ’ considers several notable figures in the history of exploration including: Harkhuf, who in 2270 bce explored the Nile River; Pytheas of Massalia, who around 325 bce sailed out north of the Bay of Biscay and circumnavigated the British Isles; Alexander the Great who introduced the Greeks to Arabia and India; Zhang Qian, in 139 bce, who provided the geographical stimulus to the further opening of the Silk Road; Ptolemy, whose second-century treatise Geographia encouraged exploratory ambitions for centuries to come; thirteenth-century Friar William of Rubruck; the traveller Marco Polo; and the accidental explorers Zheng He, who lead maritime expeditions through the Indian Ocean, between 1405 and 1433, and Moroccan pilgrim Abu 'Abdallah ibn Battúta.

Sign in / Sign up

Export Citation Format

Share Document