Disentangling the components of triploid block and its fitness consequences in natural diploid‐tetraploid contact zones of Arabidopsis arenosa

2021 ◽  
Author(s):  
Emma J. Morgan ◽  
Martin Čertner ◽  
Magdalena Lučanová ◽  
Utku Deniz ◽  
Kateřina Kubíková ◽  
...  
Keyword(s):  
Contact Zones ◽  
Fitness Consequences ◽  
Arabidopsis Arenosa ◽  
Triploid Block

scholarly journals Niche similarity in diploid‐autotetraploid contact zones of Arabidopsis arenosa across spatial scales

2020 ◽  
Vol 107 (10) ◽  
pp. 1375-1388
Author(s):  
Emma J. Morgan ◽  
Martin Čertner ◽  
Magdalena Lučanová ◽  
Kateřina Kubíková ◽  
Karol Marhold ◽  
...  
Keyword(s):  
Spatial Scales ◽  
Contact Zones ◽  
Arabidopsis Arenosa

Dealing with hot rocky environments: Critical thermal maxima and locomotor performance in Leptodactylus lithonaetes (Anura: Leptodactylidae)

2019 ◽  
pp. 155-161 ◽  
Author(s):  
Ivan Beltran
Keyword(s):  
Environmental Temperature ◽  
Extreme Temperature ◽  
Effect Of Temperature ◽  
Maximum Speed ◽  
Locomotor Performance ◽  
Extreme Temperatures ◽  
Physiological Limits ◽  
Fitness Consequences ◽  
Thermal Maximum ◽  
Environmental Temperatures

Environmental temperature has fitness consequences on ectotherm development, ecology and behaviour. Amphibians are especially vulnerable because thermoregulation often trades with appropriate water balance. Although substantial research has evaluated the effect of temperature in amphibian locomotion and physiological limits, there is little information about amphibians living under extreme temperature conditions. Leptodactylus lithonaetes is a frog allegedly specialised to forage and breed on dark granitic outcrops and associated puddles, which reach environmental temperatures well above 40 ˚C. Adults can select thermally favourable microhabitats during the day while tadpoles are constrained to rock puddles and associated temperature fluctuations; we thus established microhabitat temperatures and tested whether the critical thermal maximum (CTmax) of L. lithonaetes is higher in tadpoles compared to adults. In addition, we evaluated the effect of water temperature on locomotor performance of tadpoles. Contrary to our expectations, puddle temperatures were comparable and even lower than those temperatures measured in the microhabitats used by adults in the daytime. Nonetheless, the CTmax was 42.3 ˚C for tadpoles and 39.7 ˚C for adults. Regarding locomotor performance, maximum speed and maximum distance travelled by tadpoles peaked around 34 ˚C, approximately 1 ˚C below the maximum puddle temperatures registered in the puddles. In conclusion, L. lithonaetes tadpoles have a higher CTmax compared to adults, suggesting a longer exposure to extreme temperatures that lead to maintain their physiological performance at high temperatures. We suggest that these conditions are adaptations to face the strong selection forces driven by this granitic habitat.

Brahmi legends on Umayyad Fulus: Interrogating local minting practices and numismatic transculturation in Gandhara (ca. 750 CE)

Afghanistan ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 153-165
Author(s):  
Waleed Ziad
Keyword(s):  
Base Metal ◽  
Late Antiquity ◽  
Eighth Century ◽  
Political Authority ◽  
Unusual Feature ◽  
Complex Relationship ◽  
Contact Zones ◽  
Confessional Identity ◽  
Derivatives Of

This paper concerns a historically significant find of copper derivatives of Umayyad post-reform fulus from Gandhara, probably minted in the mid-eighth century under Turk Shahi sovereignty (c. 667–875). The coins share an unusual feature: two Brahmi aksharas on an Umayyad AE prototype, inversely oriented to a partially-corrupted Arabic legend. These base metal coins represent perhaps the only known caliphal imitative varieties issued by moneyers beyond the eastern limits of Umayyad and Abbasid sovereignty. They have the potential to inform our understanding of the complex relationship between political authority, confessional identity, and coin typology in late antiquity – particularly within early “Hindu”– “Muslim” contact zones. Moreover, they provide invaluable clues into the circulatory regimes of Umayyad coinage.

Literacy Contact Zones: A Framework for Research

2016 ◽  
Vol 4 (1) ◽  
pp. 50-72
Author(s):  
Nora McCook
Keyword(s):  
Contact Zones

‘Wisselbare Woorde’

2018 ◽  
Author(s):  
Carrol Clarkson
Keyword(s):  
South Africa ◽  
Freedom Of Expression ◽  
The Other ◽  
Frantz Fanon ◽  
Politics Of Representation ◽  
Black Consciousness ◽  
Nadine Gordimer ◽  
Contact Zones ◽  
Critical Problems ◽  
Ethics And Politics

Carrol Clarkson’s chapter wrestles with the contentious question of Coetzee’s relation to the Black Consciousness Movement in South Africa of the 1970s and early 1980s, which took its philosophical bearings from Frantz Fanon and found expression in the writings of Steve Biko. Clarkson focuses on the ways in which Coetzee departed from the ideas about writing and resistance that were circulating in his contemporary South Africa, particularly as articulated by novelist Nadine Gordimer. Clarkson discusses two related literary-critical problems: an ethics and politics of representation, and an ethics and politics of address, showing how Coetzee explores a tension between freedom of expression and responsibility to the other. In the slippage from saying to addressing we are led to further thought about modes and sites of consciousness—and hence accountabilities—in the interlocutory contact zones of the post-colony. The chapter invites a sharper appreciation of what a postcolonial philosophy might be.

An Evolutionary Perspective on Mental Time Travel

2020 ◽  
Author(s):  
Thomas Suddendorf
Keyword(s):  
Episodic Memory ◽  
Deliberate Practice ◽  
Time Travel ◽  
Mental Time Travel ◽  
Evolutionary Perspective ◽  
Scenario Building ◽  
Memory Traces ◽  
Fitness Consequences ◽  
Nonhuman Animals ◽  
Archeological Evidence

This article examines the nature and evolution of mental time travel. Evidence for capacities in other animals is reviewed and evaluated in terms of which components of the human faculty appear to be shared and which are unique. While some nonhuman animals store episodic memory traces and can display a range of future-directed capacities, they do not appear to share the open-ended ability to construct mental scenarios, to embed them into larger narratives, nor to reflect and communicate on what they entail. Nested scenario building and the urge to exchange mental experiences seem to set human minds apart in this context as in many others. The article ends with a discussion of the archeological evidence for mental time travel, focusing on deliberate practice as an example of its tremendous fitness consequences.

Sign in / Sign up

Export Citation Format

Share Document