scholarly journals Mangrove microclimates alter seedling dynamics at the range edge

Ecology ◽  
2017 ◽  
Vol 98 (10) ◽  
pp. 2513-2520 ◽  
Author(s):  
John L. Devaney ◽  
Michael Lehmann ◽  
Ilka C. Feller ◽  
John D. Parker
Keyword(s):  
Range Edge ◽  
Seedling Dynamics

Postfire seedling dynamics and performance in Pinus halepensis Mill. populations

2010 ◽  
Vol 36 (5) ◽  
pp. 446-453 ◽  
Author(s):  
Evangelia N. Daskalakou ◽  
Costas A. Thanos
Keyword(s):  
Pinus Halepensis ◽  
Seedling Dynamics ◽  
And Performance

Survival and cause-specific mortality of the female eastern wild turkey at its northern range edge

2014 ◽  
Vol 41 (7) ◽  
pp. 545 ◽  
Author(s):  
Britney Niedzielski ◽  
Jeff Bowman
Keyword(s):  
Management Strategies ◽  
Meleagris Gallopavo ◽  
Limiting Factors ◽  
Wild Turkey ◽  
High Productivity ◽  
Supplemental Food ◽  
Range Edge ◽  
The North ◽  
Wild Turkeys ◽  
Peripheral Areas

Context In an era of rapid environmental change, many species are shifting their distributions. As temperate-zone species’ expand their ranges north, different and potentially severe limiting factors may begin to affect their ability to survive and reproduce. The wild turkey (Meleagris gallopavo) is one example of a species undergoing rapid northern expansion. Aims An improved understanding of wild turkey demography at the species’ northern range periphery would facilitate effective management of this important game species. Therefore, we undertook a study to evaluate survival, causes of mortality, and behavioural strategies that may govern survival of female wild turkeys. Methods We captured 53 female wild turkeys, and used backpack transmitters to monitor their individual fates during 2012–13. Key results The annual survival estimate was 0.37 (95% CI: 0.25–0.55), with the lowest seasonal survival in the winter. The most frequent cause of mortality was mammalian predation, predominately by coyotes (Canis latrans). Age, proximity to supplemental food, and habitat use did not affect risk of mortality. Conclusions Northern wild turkeys in our study exhibited lower survival and suffered higher predation than did populations in the species’ historic range. Despite our findings, the wild turkey has expanded its range northwards and continues to exist in these peripheral areas. This may be due to high productivity or a source–sink dynamic, whereby high mortality is offset by immigration from the south. Implications The low survival and high predation of wild turkeys in the north must be considered when developing management strategies, particularly if interest exists in translocating turkeys farther north. Further research is needed to better understand whether northern turkey populations persist as sinks.

Intensive research activity alters short-term seedling dynamics in a tropical forest

2008 ◽  
Vol 24 (1) ◽  
pp. 225-230 ◽  
Author(s):  
Liza S. Comita ◽  
Gregory R. Goldsmith ◽  
Stephen P. Hubbell
Keyword(s):  
Tropical Forest ◽  
Short Term ◽  
Research Activity ◽  
Intensive Research ◽  
Seedling Dynamics

Low prevalence of the parasite Ophryocystis elektroscirrha at the range edge of the eastern North American monarch (Danaus plexippus) butterfly population

2021 ◽  
Author(s):  
Felipe Dargent ◽  
Sydney M Gilmour ◽  
Emma A Brown ◽  
Rees Kassen ◽  
Heather M Kharouba
Keyword(s):  
North American ◽  
Population Distribution ◽  
Danaus Plexippus ◽  
Range Limits ◽  
North American Population ◽  
Ophryocystis Elektroscirrha ◽  
Range Edge ◽  
Relative Contribution ◽  
Northern Edge ◽  
Butterfly Population

Every year monarch butterflies (Danaus plexippus Linnaeus, 1758) from the eastern North American population migrate from Mexico to Southern Canada in the spring. This northward migration has been shown to reduce monarch infection with the host-specific parasite Ophryocystis elektroscirrha (OE) (McLaughlin and Myers, 1970); yet, the prevalence of OE at their range limits, and the mechanism(s) responsible, is unknown. We assessed OE infection levels of monarchs at the northern edge of the eastern population distribution around Ottawa, Canada, and found extremely low levels of infection (~1% with upper confidence intervals close to 3%). Low OE infection levels are likely due to low densities of monarchs in this region and/or migratory escape effects, where migrating individuals leave behind areas with high density of conspecifics and high potential for parasite accumulation and transmission. Future work should aim to disentangle the relative contribution of these two mechanisms for governing the decrease in parasitism at the range limits of migratory populations.

scholarly journals Natural seed germination and seedling dynamics in cultivated population of Cassia fistula Linn. in Nigeria

2015 ◽  
Vol 10 (8) ◽  
pp. 865-870
Author(s):  
Tejumola Okusanya Olubukanla ◽  
Olanrewaju Shonubi Olusola ◽  
Elutola Babalola Sadat
Keyword(s):  
Seed Germination ◽  
Cassia Fistula ◽  
Seedling Dynamics

scholarly journals Energetic Consequences for a Northern, Range-Edge Lizard Population

Copeia ◽  
2018 ◽  
Vol 106 (3) ◽  
pp. 468-476 ◽  
Author(s):  
Sean D. Powers ◽  
Matthew R. McTernan ◽  
Donald R. Powers ◽  
Roger A. Anderson
Keyword(s):  
Range Edge

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 Chimpanzee (Pan troglodytes verus) density and environmental gradients at their biogeographical range edge

2020 ◽  
Author(s):  
Erin G. Wessling ◽  
Paula Dieguez ◽  
Manuel Llana ◽  
Liliana Pacheco ◽  
Jill D. Pruetz ◽  
...  
Keyword(s):  
Pan Troglodytes ◽  
Habitat Heterogeneity ◽  
Environmental Gradients ◽  
Abiotic Factors ◽  
Habitat Characteristics ◽  
Pan Troglodytes Verus ◽  
Range Limit ◽  
Range Edge ◽  
Food Species ◽  
Underlying Mechanisms

ABSTRACTIdentifying ecological gradients at the range edge of a species is an essential step in revealing the underlying mechanisms and constraints that limit the species’ geographic range. We aimed to describe the patterns of variation in chimpanzee (Pan troglodytes verus) density and habitat characteristics perpendicular to the northern edge of their range and to investigate potential environmental mechanisms underlying chimpanzee distribution in a savanna-mosaic habitat. We estimated chimpanzee densities at six sites forming a 126 km latitudinal gradient at the biogeographical range edge of the western chimpanzee in the savanna-mosaic habitats of southeastern Senegal. To accompany these data, we used systematically placed vegetation plots to characterize the habitats at each site for habitat heterogeneity, tree density and size, floral assemblages, among other variables. We found that both biotic and abiotic factors are potential determinants of the chimpanzee range limit in this ecoregion. Specifically, chimpanzee-occupied landscapes at the limit had smaller available floral assemblages, less habitat heterogeneity, and contained fewer closed canopy habitats in which chimpanzees could seek refuge from high temperatures than landscapes farther from the range limit. This pattern was accompanied by a decline in chimpanzee density with increasing proximity to the range limit. Our results provide several indications of the potential limits of food species diversity, thermal refuge, and water availability to the chimpanzee niche and the implications of these limits for chimpanzee biogeography, especially in the face of climate change predictions, as well as to species distributional modeling more generally.

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