scholarly journals A tale of two conifers: Migration across a dispersal barrier outpaced regional expansion from refugia

2021 ◽  
Author(s):  
Matias C. Fernandez ◽  
Feng Sheng Hu ◽  
Daniel G. Gavin ◽  
Guillaume Lafontaine ◽  
Katy D. Heath ◽  
...  
Keyword(s):  
Dispersal Barrier

scholarly journals Frontier mutualism: coevolutionary patterns at the northern range limit of the leaf-cutter ant–fungus symbiosis

2011 ◽  
Vol 278 (1721) ◽  
pp. 3050-3059 ◽  
Author(s):  
Ulrich G. Mueller ◽  
Alexander S. Mikheyev ◽  
Scott E. Solomon ◽  
Michael Cooper
Keyword(s):  
Range Limits ◽  
Peripheral Populations ◽  
Range Limit ◽  
Long Distance ◽  
Dispersal Barrier ◽  
The Andes ◽  
Genetic Patterns ◽  
Northern Range Limit ◽  
Traditional Assumption ◽  
Ant Fungus

Tropical leaf-cutter ants cultivate the fungus Attamyces bromatificus in a many-to-one, diffuse coevolutionary relationship where ant and fungal partners re-associate frequently over time. To evaluate whether ant– Attamyces coevolution is more specific (tighter) in peripheral populations, we characterized the host-specificities of Attamyces genotypes at their northern, subtropical range limits (southern USA, Mexico and Cuba). Population-genetic patterns of northern Attamyces reveal features that have so far not been observed in the diffusely coevolving, tropical ant– Attamyces associations. These unique features include (i) cases of one-to-one ant– Attamyces specialization that tighten coevolution at the northern frontier; (ii) distributions of genetically identical Attamyces clones over large areas (up to 81 000 km 2 , approx. the area of Ireland, Austria or Panama); (iii) admixture rates between Attamyces lineages that appear lower in northern than in tropical populations; and (iv) long-distance gene flow of Attamyces across a dispersal barrier for leaf-cutter ants (ocean between mainland North America and Cuba). The latter suggests that Attamyces fungi may occasionally disperse independently of the ants, contrary to the traditional assumption that Attamyces fungi depend entirely on leaf-cutter queens for dispersal. Peripheral populations in Argentina or at mid-elevation sites in the Andes may reveal additional regional variants in ant– Attamyces coevolution. Studies of such populations are most likely to inform models of coextinctions of obligate mutualistic partners that are doubly stressed by habitat marginality and by environmental change.

scholarly journals Biogeographic Barriers in the Andes: Is the Amotape—Huancabamba Zone a Dispersal Barrier for Dry Forest Plants?

2017 ◽  
Vol 102 (3) ◽  
pp. 542-550 ◽  
Author(s):  
Catalina Quintana ◽  
R. Toby Pennington ◽  
Carmen Ulloa Ulloa ◽  
Henrik Balslev
Keyword(s):  
Dry Forest ◽  
Dispersal Barrier ◽  
The Andes ◽  
Forest Plants

scholarly journals Evaluating the Impact of Wildlife Shelter Management on the Genetic Diversity of Erinaceus europaeus and E. roumanicus in Their Contact Zone

Animals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1452 ◽  
Author(s):  
Kerstin Ploi ◽  
Manuel Curto ◽  
Barbora Černá Bolfíková ◽  
Miroslava Loudová ◽  
Pavel Hulva ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Geographical Area ◽  
Abundant Species ◽  
Wild Populations ◽  
Erinaceus Europaeus ◽  
Dispersal Barrier ◽  
Distance Analysis ◽  
Genetic Impact ◽  
Potential Impact ◽  
The Impact

Hedgehogs are among the most abundant species to be found within wildlife shelters and after successful rehabilitation they are frequently translocated. The effects and potential impact of these translocations on gene flow within wild populations are largely unknown. In this study, different wild hedgehog populations were compared with artificially created “shelter populations”, with regard to their genetic diversity, in order to establish basic data for future inferences on the genetic impact of hedgehog translocations. Observed populations are located within central Europe, including the species Erinaceus europaeus and E. roumanicus. Shelters were mainly hosting one species; in one case, both species were present syntopically. Apart from one exception, the results did not show a higher genetic diversity within shelter populations, indicating that individuals did not originate from a wider geographical area than individuals grouped into one of the wild populations. Two shelters from Innsbruck hosted individuals that belonged to two potential clusters, as indicated in a distance analysis. When such a structure stems from the effects of landscape elements like large rivers, the shelter management-related translocations might lead to homogenization across the dispersal barrier.

scholarly journals Influence of a high‐head dam as a dispersal barrier to fish community structure of the Upper Mississippi River

2019 ◽  
Vol 36 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Rebekah L. Anderson ◽  
Cory A. Anderson ◽  
James H. Larson ◽  
Brent Knights ◽  
Jon Vallazza ◽  
...  
Keyword(s):  
Community Structure ◽  
Mississippi River ◽  
Fish Community ◽  
Upper Mississippi River ◽  
Fish Community Structure ◽  
Dispersal Barrier ◽  
High Head

Effects of tow transit on the efficacy of the Chicago Sanitary and Ship Canal Electric Dispersal Barrier System

2017 ◽  
Vol 43 (6) ◽  
pp. 1119-1131 ◽  
Author(s):  
Jeremiah J. Davis ◽  
Jessica Z. LeRoy ◽  
Matthew R. Shanks ◽  
P. Ryan Jackson ◽  
Frank L. Engel ◽  
...  
Keyword(s):  
Dispersal Barrier

scholarly journals Mass appearance of the Ponto-Caspian invader Pontogammarus robustoides in the River Tisza catchment: bypass in the southern invasion corridor?

2020 ◽  
pp. 9 ◽  
Author(s):  
Zoltán Csabai ◽  
Péter Borza ◽  
Tomasz Rewicz ◽  
Bálint Pernecker ◽  
Balázs J. Berta ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Western Europe ◽  
Main Channel ◽  
Fish Stocking ◽  
Ship Traffic ◽  
Dispersal Barrier ◽  
River Danube ◽  
Pontogammarus Robustoides ◽  
First Time ◽  
Invasion Corridor

The river Danube is the backbone of the ‘southern invasion corridor’, one of the most important passages for the spread of Ponto-Caspian invaders in Europe. However, not all of these species used the passive or active upstream movement in the main channel to reach the upper sections and tributaries, some found detours. Mass occurrences of the Ponto-Caspian peracarid, Pontogammarus robustoides (Sars, 1894) were recorded at 17 sites along the entire Hungarian section of the River Maros, for the first time in the River Tisza catchment and also in Hungary. Those populations are found ca. 707 km upstream from the closest known and confirmed locality in the lower Danube section. We confirmed their identity by DNA barcoding and showed that all individuals fit in with the lower Danube population, thus identifying the source of this introduction. The most likely vector allowing the jump dispersal of the species is fish stocking in the Romanian section of the River Maros, which − combined with downstream drift to the Serbian Danube section and the relatively busy ship traffic between Belgrade and Vienna − might provide the opportunity to bypass the dispersal barrier represented by the unregulated Middle Danube and open the way towards Western Europe.

The Rocky Mountains as a dispersal barrier between barn owl (Tyto alba ) populations in North America

2018 ◽  
Vol 45 (6) ◽  
pp. 1288-1300 ◽  
Author(s):  
Ana Paula Machado ◽  
Laura Clément ◽  
Vera Uva ◽  
Jérôme Goudet ◽  
Alexandre Roulin
Keyword(s):  
North America ◽  
Rocky Mountains ◽  
Barn Owl ◽  
Tyto Alba ◽  
Dispersal Barrier
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