Influence of dust deposition and climate on the radial growth of Tsuga canadensis near its northern range limit

2015 ◽  
Vol 135 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Emad A. Farahat ◽  
Hans W. Linderholm ◽  
Martin J. Lechowicz
Keyword(s):  
Radial Growth ◽  
Tsuga Canadensis ◽  
Range Limit ◽  
Dust Deposition ◽  
Northern Range Limit

Green Turtles Nesting at Their Northern Range Limit in the United States Represent a Distinct Subpopulation

2018 ◽  
Vol 17 (2) ◽  
pp. 314 ◽  
Author(s):  
Brian M. Shamblin ◽  
Matthew H. Godfrey ◽  
S. Michelle Pate ◽  
William P. Thompson ◽  
Hope Sutton ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Range Limit ◽  
Green Turtles ◽  
Distinct Subpopulation ◽  
Northern Range Limit

Breeding behaviour of ectotherms at high latitudes: the case of the natterjack toad Epidalea calamita at its northern range limit

Behaviour ◽  
2021 ◽  
pp. 1-20
Author(s):  
Linda Saare ◽  
Riinu Rannap
Keyword(s):  
Climatic Conditions ◽  
Energetic Cost ◽  
Breeding Period ◽  
High Latitudes ◽  
Range Limit ◽  
Photo Identification ◽  
Breeding Behaviour ◽  
Risk Of Predation ◽  
Increased Risk ◽  
Northern Range Limit

Abstract We explored the breeding behaviour of a threatened amphibian, the natterjack toad, at its northern range limit in Estonia, to determine the extent to which reproduction is affected by harsh and unstable climatic conditions. Using photo identification of specimens, we found that in optimal weather conditions males formed three breeding cohorts, while in adverse conditions only a single cohort occurred and under extreme conditions reproduction was skipped entirely. During the extended breeding season, larger males participated in reproduction throughout the breeding period, while smaller males appeared in later cohorts. Breeding success was related to the calling effort of a male, where larger males had greater mating success than smaller ones. We found that the natterjack toad males exhibit significant plasticity in reproductive behaviour at the northern range limit, which, given the energetic cost of reproduction and the increased risk of predation, allows them to increase their fitness at high latitudes.

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.

Living on the edge: Fig tree phenology at the northern range limit of monoecious Ficus in China

2014 ◽  
Vol 57 ◽  
pp. 135-141 ◽  
Author(s):  
Lu-Shui Zhang ◽  
Stephen G. Compton ◽  
Hui Xiao ◽  
Qian Lu ◽  
Yan Chen
Keyword(s):  
Range Limit ◽  
Tree Phenology ◽  
Northern Range Limit ◽  
Fig Tree

scholarly journals Variable habitat selection and movement patterns among Bullsnake (Pituophis catenifer sayi) populations in Saskatchewan

2019 ◽  
Vol 132 (2) ◽  
pp. 126-139 ◽  
Author(s):  
Tera L. Edkins ◽  
Christopher M. Somers ◽  
Mark C. Vanderwel ◽  
Miranda J. Sadar ◽  
Ray G. Poulin
Keyword(s):  
Habitat Selection ◽  
Radio Telemetry ◽  
Geographic Location ◽  
Space Use ◽  
Fine Scale ◽  
Range Limit ◽  
Northern Range Limit ◽  
Range Overlap ◽  
Conservation Concern ◽  
River Valleys

Pituophis catenifer sayi (Bullsnake) is a sparsely studied subspecies of conservation concern in Canada. Basic ecological information is lacking for P. c. sayi, which reaches its northern range limit in western Canada. To address this gap, we used radio-telemetry to examine space use and habitat selection in three populations of Bullsnakes in disjunct river valley systems (Frenchman, Big Muddy, and South Saskatchewan River Valleys) across their Saskatchewan range. Bullsnakes in two valleys used up to three times more space, travelled 2.5-times farther from overwintering sites, and had lower home range overlap than the third population. Landscape-level habitat selection was flexible, with snakes in all populations using both natural and human-modified habitats most frequently. Fine-scale habitat selection was also similar among populations, with Bullsnakes selecting sites within 1 m of refuges, regardless of whether they were natural or anthropogenic. Based on these results, Bullsnakes are flexible in their broad scale habitat use, as long as they are provided with fine scale refuge sites. The distribution of key seasonal resources appears to ultimately determine space use and habitat selection by Bullsnakes, regardless of the geographic location of the population.

Environmental extremes drive population structure at the northern range limit of Atlantic salmon in North America

2018 ◽  
Vol 27 (20) ◽  
pp. 4026-4040 ◽  
Author(s):  
Emma V. A. Sylvester ◽  
Robert G. Beiko ◽  
Paul Bentzen ◽  
Ian Paterson ◽  
John B. Horne ◽  
...  
Keyword(s):  
Population Structure ◽  
North America ◽  
Atlantic Salmon ◽  
Range Limit ◽  
Environmental Extremes ◽  
Northern Range Limit

Growth of canopy red oak near its northern range limit: current trends, potential drivers, and implications for the future

2020 ◽  
Vol 50 (10) ◽  
pp. 975-988
Author(s):  
Rebecca L. Stern ◽  
Paul G. Schaberg ◽  
Shelly A. Rayback ◽  
Paula F. Murakami ◽  
Christopher F. Hansen ◽  
...  
Keyword(s):  
Acid Deposition ◽  
Basal Area ◽  
Growth Potential ◽  
Tree Age ◽  
Red Oak ◽  
Surprising Result ◽  
Range Limit ◽  
Size Groups ◽  
Northern Range Limit ◽  
Summer Temperatures

Red oak (Quercus rubra L.) is projected to expand into the northern hardwood forest over the coming century. We explored the connection between red oak basal area growth and a number of factors (tree age and size, stand dynamics, site elevation, and climate and acid deposition variables) for 213 trees in 11 plots throughout Vermont, USA. Red oak growth generally increased over the course of the chronology (1935–2014) and has been particularly high in recent decades. Growth differed among elevational groups but did not differ between age or size groups. Summer moisture metrics were consistently and positively associated with growth, whereas fall moisture was associated with reduced growth in recent decades. Higher summer temperatures were often negatively associated with growth, though there was evidence that low temperatures in the summer (higher elevations) and fall (lower elevations) constrain growth. Several pollution metrics were associated with reduced growth, a surprising result for a species not known to be sensitive to inputs of acid deposition that have predisposed other species in the region to decline. While red oak growth is currently robust, increases in summer temperatures, reductions in growing season precipitation, or increases in fall precipitation could reduce future growth potential.

Phenology and ecology of the alien seagrass Halophila stipulacea in its northern range limit in the Mediterranean Sea

2021 ◽  
Vol 168 ◽  
pp. 103304 ◽  
Author(s):  
Selene Di Genio ◽  
Martina Gaglioti ◽  
Claudia Meneghesso ◽  
Fabio Barbieri ◽  
Carlo Cerrano ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Range Limit ◽  
Halophila Stipulacea ◽  
Northern Range Limit ◽  
The Mediterranean

scholarly journals What has happened to the females? Population trends in the Aesculapian snake at its northern range limit

2019 ◽  
Vol 17 ◽  
pp. e00550 ◽  
Author(s):  
Katarzyna Kurek ◽  
Adam Ćmiel ◽  
Stanisław Bury ◽  
Bartłomiej Zając ◽  
Kamil Najberek ◽  
...  
Keyword(s):  
Population Trends ◽  
Range Limit ◽  
Northern Range Limit
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