No evidence for rapid evolution of seed dispersal ability in range edge populations of the invasive speciesSenecio madagascariensis

2013 ◽  
Vol 38 (8) ◽  
pp. 915-920 ◽  
Author(s):  
Karen Bartle ◽  
Angela T. Moles ◽  
Stephen P. Bonser
Keyword(s):  
Seed Dispersal ◽  
Rapid Evolution ◽  
Dispersal Ability ◽  
Range Edge ◽  
Edge Populations

scholarly journals Genetic patterns in range-edge populations of Vaccinium species from the central Balkans: implications on conservation prospects and sustainable usage

Silva Fennica ◽  
2015 ◽  
Vol 49 (4) ◽  
Author(s):  
Ivana Bjedov ◽  
Dragica Obratov–Petković ◽  
Danijela Mišić ◽  
Branislav Šiler ◽  
Jelena Aleksic
Keyword(s):  
Range Edge ◽  
Genetic Patterns ◽  
Edge Populations ◽  
Sustainable Usage

scholarly journals Autumn freeze-thaw events carry over to depress late-winter reproductive performance in Canada jays

2019 ◽  
Vol 6 (4) ◽  
pp. 181754 ◽  
Author(s):  
Alex O. Sutton ◽  
Dan Strickland ◽  
Nikole E. Freeman ◽  
Amy E. M. Newman ◽  
D. Ryan Norris
Keyword(s):  
Climate Change ◽  
Reproductive Performance ◽  
Climatic Conditions ◽  
Late Winter ◽  
Freeze Thaw ◽  
Range Edge ◽  
Food Caching ◽  
Nestling Condition ◽  
Edge Populations ◽  
Carry Over

Evidence suggests that range-edge populations are highly vulnerable to the impacts of climate change, but few studies have examined the specific mechanisms that are driving observed declines. Species that store perishable food for extended periods of time may be particularly susceptible to environmental change because shifts in climatic conditions could accelerate the natural degradation of their cached food. Here, we use 40 years of breeding data from a marked population of Canada jays ( Perisoreus canadensis ) located at the southern edge of their range in Algonquin Provincial Park, Ontario, to examine whether climatic conditions prior to breeding carry over to influence reproductive performance. We found that multiple measures of Canada jay reproductive performance (brood size, nest success and nestling condition) in the late winter were negatively correlated with the number of freeze–thaw events the previous autumn. Our results suggest that freeze–thaw events have a significant detrimental impact on the quality and/or quantity of cached food available to Canada jays. Future increases in such events, caused by climate change, could pose a serious threat to Canada jays and other food caching species that store perishable foods for long periods of time.

Active sexual reproduction but no sign of genetic diversity in range-edge populations of Vanilla roscheri Rchb. f. (Orchidaceae) in South Africa

2014 ◽  
Vol 15 (6) ◽  
pp. 1403-1415 ◽  
Author(s):  
Rodolphe L. Gigant ◽  
Alexandre De Bruyn ◽  
Brigitte Church ◽  
Laurence Humeau ◽  
Anne Gauvin-Bialecki ◽  
...  
Keyword(s):  
South Africa ◽  
Genetic Diversity ◽  
Sexual Reproduction ◽  
Range Edge ◽  
Edge Populations

scholarly journals Spatial distribution and hotspots of mammals in Canada

2020 ◽  
Author(s):  
Victor Cameron ◽  
Anna L. Hargreaves
Keyword(s):  
At Risk ◽  
Conservation Status ◽  
Grid Cell ◽  
Mammal Species ◽  
Range Edge ◽  
Threat Status ◽  
Trade Offs ◽  
As Species ◽  
Edge Populations ◽  
Mammal Diversity

AbstractHigh-latitude countries often contain the polar range edge of species that are common farther south. The more peripherally a species occurs in a country, the smaller its national range will be and the more its national range will consist of range-edge populations, which are often predicted to be relatively small, isolated, and unproductive. Together, this may focus national conservation efforts toward peripheral species whose global conservation value is controversial. However, if range-edge taxa occur where overall diversity is also high, there would be fewer trade-offs in protecting them. Using 153 of the 158 terrestrial mammal species in Canada, we tested how species’ distributions relate to their national conservation status and total mammal richness. Half of ‘Canadian’ mammals had <20% of their global range in Canada. Range area in Canada was strongly associated with national threat status; mammals considered ‘at-risk’ in Canada had 42% smaller Canadian ranges than mammals considered secure. However, after accounting for range area, being more peripheral (smaller proportion of global range in Canada) did not increase the likelihood that a taxon was considered at-risk. We overlaid the 153 maps to calculate mammal diversity across Canada, divided into 100×100 km grid cells. We found that hotspots of at-risk mammals (cells with >4 at-risk taxa) and hotspots of range-edge mammals (cells with >12 taxa with ≤20% of their range in Canada) were about twice as species rich as non-hotspot cells, containing up to 44% of Canadian mammal diversity per grid-cell. Our results suggest that protecting areas with the most at-risk or range-edge mammals would simultaneously protect habitat for many species currently deemed secure.

Crassocephalum crepidioides (redflower ragleaf).

2021 ◽  
Author(s):  
Julissa Rojas-Sandoval ◽  
Pedro Acevedo-Rodríguez
Keyword(s):  
Seed Dispersal ◽  
Wide Distribution ◽  
Dispersal Ability ◽  
Pioneer Species ◽  
Invasive Capacity

Abstract C. crepidiodes is an invasive herb included in the Global Compendium of Weeds and classified as one of the most aggressive weeds occurring in tropical and subtropical regions (Randall, 2012). It is a pioneer species with the capability to produce large amounts of hairy wind-dispersed seeds. However, Chen et al. (2009) suggest that seed dispersal ability is limited. Chen et al. (2009) report that the species has only a moderate invasive capacity and that its wide distribution in China possibly correlates with its cultivation.

Rapid evolution of parasite life history traits on an expanding range-edge

2012 ◽  
Vol 15 (4) ◽  
pp. 329-337 ◽  
Author(s):  
Crystal Kelehear ◽  
Gregory P. Brown ◽  
Richard Shine
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Rapid Evolution ◽  
Range Edge
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