scholarly journals Evaluating current and future range limits of an endangered, keystone rodent ( Dipodomys ingens )

2019 ◽  
Vol 25 (7) ◽  
pp. 1074-1087 ◽  
Author(s):  
Ivy V. Widick ◽  
William T. Bean
Keyword(s):  
Range Limits ◽  
Dipodomys Ingens

scholarly journals Mammalian herbivores restrict the altitudinal range limits of alpine plants

2021 ◽  
Author(s):  
Joshua S. Lynn ◽  
Tom E. X. Miller ◽  
Jennifer A. Rudgers
Keyword(s):  
Alpine Plants ◽  
Range Limits ◽  
Mammalian Herbivores ◽  
Altitudinal Range

Cold water temperatures define the poleward range limits of south American fiddler crabs

2021 ◽  
pp. 107494
Author(s):  
Fernando Rafael De Grande ◽  
Jonathann Yukio Arakaki ◽  
Murilo Marochi ◽  
Tânia Marcia Costa
Keyword(s):  
Cold Water ◽  
Range Limits ◽  
South American ◽  
Fiddler Crabs

scholarly journals Status and conservation of the giant muntjac Megamuntiacus vuquangensis, and notes on other muntjac species in Laos

Oryx ◽  
1998 ◽  
Vol 32 (1) ◽  
pp. 59-67 ◽  
Author(s):  
R. J. Timmins ◽  
T. D. Evans ◽  
Khamkhoun Khounboline ◽  
Chainoi Sisomphone
Keyword(s):  
Habitat Degradation ◽  
Range Limits ◽  
Restricted Range ◽  
Taxonomic Affinity ◽  
Red Data Book ◽  
Wide Range ◽  
Data Book ◽  
The Common ◽  
Near Future ◽  
Muntiacus Muntjak

The large-antlered, or giant, muntjac Megamuntiacus vuquangensis wasdescribed from Vietnam in 1994 and found concurrently in the Annamite Mountains and nearby hill ranges of central and southern Laos. The northerly and southerly range limits are still unknown. It may occupy a wide range of habitats and is found sympatrically with the common muntjac Muntiacus muntjak. Another muntjac species, the taxonomic affinity of which is as yet undetermined, was recently discovered to occur within its range. The large-antlered muntjac is probably not threatened with extinction in the near future, but in view of its restricted range and threats from habitat degradation and hunting, it should be classified as Vulnerable in the Red Data Book. Its future in Laos is largely dependent on the recently created protected-areas system to maintain large tracts of habitat and reduce hunting pressure.

Low recruitment not mortality limits growth of peripheral populations of Silene spaldingii

Botany ◽  
2014 ◽  
Vol 92 (5) ◽  
pp. 340-347 ◽  
Author(s):  
Peter Lesica
Keyword(s):  
Population Viability ◽  
Plant Population ◽  
Range Limits ◽  
Peripheral Populations ◽  
Vital Rates ◽  
Plateau Region ◽  
Columbia Plateau ◽  
Central Population ◽  
Variable Recruitment ◽  
Eastern Washington

Populations at the periphery of a species range are thought to be less viable than those in the center because they are at the limit of their ecological tolerances. Plant population viability is determined primarily by mortality and recruitment, thus knowing differences in vital rates between central and peripheral populations is key to understanding range limits. Silene spaldingii S. Watson is a long-lived iteroparous plant that occurs throughout the eastern Columbia Plateau region of eastern Washington and adjacent Idaho and Oregon and is disjunct in northwest Montana. I recorded the fate of mapped S. spaldingii plants annually for 10 years in four populations, two from eastern Washington and two from Montana. Recruitment averaged three times higher and relatively constant at two central populations in Washington compared with two peripheral sites in Montana. Mortality was three times higher at one of the central populations compared with the remaining three sites due to vole predation. Vole activity was observed at the second central population but came too late in the study to be certain that it resulted in mortality. Vole predation was not observed in the peripheral populations. My results suggest that peripheral populations of S. spaldingii may only be able to persist as long as predation or other sources of mortality remain low and that intrinsic low and variable recruitment rates coupled with predation may help define the eastern range margin of this species.

scholarly journals Revised distribution and phytosociological data of Orobanche coerulescens Stephan in Willd. (Orobanchaceae): Poland in relation to Central Europe

2012 ◽  
Vol 26 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Renata Piwowarczyk
Keyword(s):  
Eastern Europe ◽  
Central Europe ◽  
Plant Communities ◽  
Field Research ◽  
Range Limits ◽  
Migration Routes ◽  
Original Field ◽  
Critical Revision ◽  
And Migration ◽  
North Western

Abstract Orobanche coerulescens has a Eurasian distribution. The species is classified as extinct at most of its localities at the western limit of its range. Its populations are very scarce and critically endangered in Central Europe. This work presents the current distribution of O.coerulescens in Poland, based on a critical revision of herbarium and literature data as well as results of original field research, and reviews its distribution in Central Europe (partly in Eastern Europe). Habitats, plant communities, and migration routes of O.coerulescens in Central Europe are discussed. The species was initially known in Poland from now historical localities in Pomerania and the valley of the lower Vistula. In 2000-2011 it was recorded at 9 localities in Podlasie, the Małopolska Upland (Wyżyna Małopolska), and the Łódź Hills (Wzniesienia Łódzkie). Its abundance at the localities ranged from a few to over 1000 shoots. These are the largest populations of O.coerulescens at its western and north-western range limits.

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 Sensitivity of mangrove range limits to climate variability

2018 ◽  
Vol 27 (8) ◽  
pp. 925-935 ◽  
Author(s):  
Kyle C. Cavanaugh ◽  
Michael J. Osland ◽  
Rémi Bardou ◽  
Gustavo Hinojosa-Arango ◽  
Juan M. López-Vivas ◽  
...  
Keyword(s):  
Climate Variability ◽  
Range Limits

scholarly journals Local and regional controls of phylogenetic structure at the high-latitude range limits of corals

2017 ◽  
Vol 284 (1861) ◽  
pp. 20170915 ◽  
Author(s):  
Brigitte Sommer ◽  
Eugenia M. Sampayo ◽  
Maria Beger ◽  
Peter L. Harrison ◽  
Russ C. Babcock ◽  
...  
Keyword(s):  
Climate Change ◽  
High Latitude ◽  
Species Interactions ◽  
Phylogenetic Signal ◽  
Range Limits ◽  
High Turnover ◽  
Phylogenetic Structure ◽  
Phylogenetic Clustering ◽  
Latitude Range ◽  
Eastern Australia

Understanding how range-edge populations will respond to climate change is an urgent research priority. Here, we used a phylogenetic community ecology approach to examine how ecological and evolutionary processes shape biodiversity patterns of scleractinian corals at their high-latitude range limits in eastern Australia. We estimated phylogenetic signal in seven ecologically important functional traits and conducted tests of phylogenetic structure at local and regional scales using the net relatedness (NRI) and nearest taxon indices (NTI) for the presence/absence and abundance data. Regional tests showed light phylogenetic clustering, indicating that coral species found in this subtropical-to-temperate transition zone are more closely related to each other than are species on the nearby, more northerly Great Barrier Reef. Local tests revealed variable patterns of phylogenetic clustering and overdispersion and higher than expected phylogenetic turnover among sites. In combination, these results are broadly consistent with the hierarchical filtering model, whereby species pass through a regional climatic filter based on their tolerances for marginal conditions and subsequently segregate into local assemblages according to the relative strength of habitat filtering and species interactions. Conservatism of tested traits suggests that corals will likely track their niches with climate change. Nevertheless, high turnover of lineages among sites indicates that range shifts will probably vary among species and highlights the vulnerability and conservation significance of high-latitude reefs.

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