Home | [41–50] << 51 52 53 54 55 56 57 58 59 60 >> [61–70] |
Records | |||||
---|---|---|---|---|---|
Author | Santin-Janin Hugues, Hugueny Bernard, Aubry Philippe, Fouchet David, Gimenez Olivier, Pontier Dominique, | ||||
Title | Accounting for Sampling Error When Inferring Population Synchrony from Time-Series Data: A Bayesian State-Space Modelling Approach with Applications | Type | Journal Article | ||
Year | 2014 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 9 | Issue | 1 | Pages | e87084- |
Keywords | |||||
Abstract | Data collected to inform time variations in natural population size are tainted by sampling error. Ignoring sampling error in population dynamics models induces bias in parameter estimators, e.g., density-dependence. In particular, when sampling errors are independent among populations, the classical estimator of the synchrony strength (zero-lag correlation) is biased downward. However, this bias is rarely taken into account in synchrony studies although it may lead to overemphasizing the role of intrinsic factors (e.g., dispersal) with respect to extrinsic factors (the Moran effect) in generating population synchrony as well as to underestimating the extinction risk of a metapopulation. The aim of this paper was first to illustrate the extent of the bias that can be encountered in empirical studies when sampling error is neglected. Second, we presented a space-state modelling approach that explicitly accounts for sampling error when quantifying population synchrony. Third, we exemplify our approach with datasets for which sampling variance (i) has been previously estimated, and (ii) has to be jointly estimated with population synchrony. Finally, we compared our results to those of a standard approach neglecting sampling variance. We showed that ignoring sampling variance can mask a synchrony pattern whatever its true value and that the common practice of averaging few replicates of population size estimates poorly performed at decreasing the bias of the classical estimator of the synchrony strength. The state-space model used in this study provides a flexible way of accurately quantifying the strength of synchrony patterns from most population size data encountered in field studies, including over-dispersed count data. We provided a user-friendly R-program and a tutorial example to encourage further studies aiming at quantifying the strength of population synchrony to account for uncertainty in population size estimates. |
||||
Programme | 279 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 5004 | |||
Permanent link to this record | |||||
Author | |||||
Title | Evidence for Sex-Segregated Ocean Distributions of First-Winter Wandering Albatrosses at Crozet Islands | Type | Journal Article | ||
Year | 2014 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 9 | Issue | 2 | Pages | e86779- |
Keywords | |||||
Abstract | The highly mobile wandering albatrosses ( |
||||
Programme | 109 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 5039 | |||
Permanent link to this record | |||||
Author | |||||
Title | Type | Journal Article | |||
Year | 2014 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 9 | Issue | 1 | Pages | e85291- |
Keywords | |||||
Abstract | |||||
Programme | 388 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 5365 | |||
Permanent link to this record | |||||
Author | |||||
Title | Soil Calcium Availability Influences Shell Ecophenotype Formation in the Sub-Antarctic Land Snail, |
Type | Journal Article | ||
Year | 2013 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 12 | Pages | e84527- |
Keywords | |||||
Abstract | Ecophenotypes reflect local matches between organisms and their environment, and show plasticity across generations in response to current living conditions. Plastic responses in shell morphology and shell growth have been widely studied in gastropods and are often related to environmental calcium availability, which influences shell biomineralisation. To date, all of these studies have overlooked micro-scale structure of the shell, in addition to how it is related to species responses in the context of environmental pressure. This study is the first to demonstrate that environmental factors induce a bi-modal variation in the shell micro-scale structure of a land gastropod. |
||||
Programme | 136 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 4685 | |||
Permanent link to this record | |||||
Author | |||||
Title | Interactions between Snow Chemistry, Mercury Inputs and Microbial Population Dynamics in an Arctic Snowpack | Type | Journal Article | ||
Year | 2013 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 11 | Pages | e79972- |
Keywords | |||||
Abstract | |||||
Programme | 399 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 4861 | |||
Permanent link to this record | |||||
Author | Chambers Lynda E, Altwegg Res, Barbraud Christophe, Barnard Phoebe, Beaumont Linda J, Crawford Robert J M, Durant Joel M, Hughes Lesley, Keatley Marie R, Low Matt, Morellato Patricia C, Poloczanska Elvira S, Ruoppolo Valeria, Vanstreels Ralph E T, Woehler Eric J, Wolfaardt Anton C, | ||||
Title | Phenological Changes in the Southern Hemisphere | Type | Journal Article | ||
Year | 2013 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 10 | Pages | e75514- |
Keywords | |||||
Abstract | Current evidence of phenological responses to recent climate change is substantially biased towards northern hemisphere temperate regions. Given regional differences in climate change, shifts in phenology will not be uniform across the globe, and conclusions drawn from temperate systems in the northern hemisphere might not be applicable to other regions on the planet. We conduct the largest meta-analysis to date of phenological drivers and trends among southern hemisphere species, assessing 1208 long-term datasets from 89 studies on 347 species. Data were mostly from Australasia (Australia and New Zealand), South America and the Antarctic/subantarctic, and focused primarily on plants and birds. This meta-analysis shows an advance in the timing of spring events (with a strong Australian data bias), although substantial differences in trends were apparent among taxonomic groups and regions. When only statistically significant trends were considered, 82% of terrestrial datasets and 42% of marine datasets demonstrated an advance in phenology. Temperature was most frequently identified as the primary driver of phenological changes; however, in many studies it was the only climate variable considered. When precipitation was examined, it often played a key role but, in contrast with temperature, the direction of phenological shifts in response to precipitation variation was difficult to predict |
||||
Programme | 109 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 4749 | |||
Permanent link to this record | |||||
Author | |||||
Title | Type | Journal Article | |||
Year | 2013 | Publication | PLoS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 9 | Pages | e74154- |
Keywords | |||||
Abstract | |||||
Programme | 131 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Public Library of Science | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 4681 | |||
Permanent link to this record | |||||
Author | |||||
Title | Type | Journal | |||
Year | 2013 | Publication | PLOS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 9 | Pages | e74154 |
Keywords | Birds Body temperature Gene expression Mitochondria Muscle biochemistry Penguins Skeletal muscles Thermogenesis | ||||
Abstract | |||||
Programme | 131 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | 1932-6203 | Medium | |
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 7217 | |||
Permanent link to this record | |||||
Author | |||||
Title | Sympatric Breeding Auks Shift between Dietary and Spatial Resource Partitioning across the Annual Cycle | Type | Journal Article | ||
Year | 2013 | Publication | PLOS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 8 | Pages | e72987 |
Keywords | |||||
Abstract | |||||
Programme | 388 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 4540 | |||
Permanent link to this record | |||||
Author | |||||
Title | A Space Oddity: Geographic and Specific Modulation of Migration in Eudyptes Penguins | Type | Journal Article | ||
Year | 2013 | Publication | PLOS ONE | Abbreviated Journal | |
Volume | 8 | Issue | 8 | Pages | |
Keywords | |||||
Abstract | |||||
Programme | 394 | ||||
Campaign | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1932-6203 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Serial | 4481 | |||
Permanent link to this record |