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共检索到173条 ,权限内显示50条;
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.wjcd9h
- 摘要：
- Observations. 1 records from KUBI Ichthyology Tissue Collection. 3 records from Florida Keys Reef Visual Census 2005. 12 records from CAS Ichthyology (ICH
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.zppet9
- 摘要：
- Observations. 2 records from KUBI Ichthyology Tissue Collection. 11 records from Florida Keys Reef Visual Census 2005. 4 records from CAS Ichthyology (ICH
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.5ziopa
- 摘要：
- Research-grade Observations. 3 records from KUBI Ichthyology Tissue Collection. 5 records from Florida Keys Reef Visual Census 2005. 3 records from
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.fgtlwh
- 摘要：
- Observations. 2 records from KUBI Ichthyology Tissue Collection. 11 records from Florida Keys Reef Visual Census 2005. 4 records from CAS Ichthyology (ICH
GBIF Occurrence Download
- 负责人：
- DOI：
- doi:10.15468/dl.ta5sfq
- 摘要：
- records from Marine Intertidal Phase 1 species dataset from the Countryside Council for Wales 1996-2005. 1 records from DASSH Data Archive Centre expert
Data from: Plant water use affects competition for nitrogen: why drought favors invasive species in California
- 负责人：
- DOI：
- doi:10.5061/dryad.5cn37rr
- 摘要：
- Classic resource competition theory typically treats resource supply rates as independent; however, nutrient supplies can be affected by plants indirectly, with important consequences for model predictions. We demonstrate this general phenomenon by using a model in which competition for nitrogen is mediated by soil moisture, with competitive outcomes including coexistence and multiple stable states as well as competitive exclusion. In the model, soil moisture regulates nitrogen availability through soil moisture dependence of microbial processes, leaching, and plant uptake. By affecting water availability, plants also indirectly affect nitrogen availability and may therefore alter the competitive outcome. Exotic annual species from the Mediterranean have displaced much of the native perennial grasses in California. Nitrogen and water have been shown to be potentially limiting in this system. We parameterize the model for a Californian grassland and show that soil moisture–mediated competition for nitrogen can explain the annual species’ dominance in drier areas, with coexistence expected in wetter regions. These results are concordant with larger biogeographic patterns of grassland invasion in the Pacific states of the United States, in which annual grasses have invaded most of the hot, dry grasslands in California but perennial grasses dominate the moister prairies of northern California, Oregon, and Washington.
Data from: The trade-off between clutch size and egg mass in tree swallows (Tachycineta bicolor) is modulated by female body mass
- 负责人：
- DOI：
- doi:10.5061/dryad.76735
- 摘要：
- tree swallows Tachycineta bicolor breeding in a network of 400 nestboxes located along a gradient of agricultural intensity between 2004 and 2011. Our dataset
Data from: Assessment of the quality of reporting in randomized controlled trials of acupuncture in the Korean literature using the CONSORT statement and the STRICTA guidelines
- 负责人：
- DOI：
- doi:10.5061/dryad.253q2
- 摘要：
- published in two time periods (1996-2004 referred to as the early period and 2005-2011 referred to as the late period). Results: We analysed 146 eligible RCTs
Data from: Diversity and composition of viral communities: coinfection of barley and cereal yellow dwarf viruses in California grasslands
- 负责人：
- DOI：
- doi:10.5061/dryad.2bj836t
- 摘要：
- Most species host multiple pathogens, yet field studies rarely examine the processes determining pathogen diversity within a single host or the effects of coinfection on pathogen dynamics in natural systems. Coinfection can affect pathogen transmission and virulence. In turn, coinfection can be regulated within hosts by interactions such as cross-protective immunity or at broader spatial scales via vector distributions. Using a general model, we demonstrate that coinfection by a group of vectored pathogens is highest with abundant generalist vectors and weak cross-protection and coinfection- induced mortality. Using these predictions, we investigate the distribution of five coexisting aphid-vectored, viral pathogens (barley and cereal yellow dwarf luteoviruses and poleroviruses) in a native perennial grass (Elymus glaucus) in both space (700 km) and time (4 years). Observed coinfection rates were much higher than expected at random, suggesting that within-host processes exerted weak effects on within-host pathogen diversity. Covariance among viruses in space and time was highest for viral species sharing a vector. Temporal correlation arose from the synchronous invasion of two viruses transmitted by a shared aphid species. On the basis of our modeling and empirical results, we expect that factors external to individual hosts may affect the coinfection dynamics in other communities hosting vectored pathogens.
Data from: New perspectives on frontal variability in the southern ocean
- 负责人：
- DOI：
- doi:10.5061/dryad.q9k8r
- 摘要：
- The frontal structure of the Southern Ocean is investigated using the Wavelet/Higher Order Statistics Enhancement (WHOSE) frontal detection method, introduced in Chapman (2014). This methodology is applied to 21 years of daily gridded absolute dynamic topography (ADT) data to obtain daily maps of the locations of the fronts. By forming frontal occurrence frequency maps and then approximating these occurrence-maps by a superposition of simple functions, the time-mean locations of the fronts, as well as a measure of their capacity to meander, are obtained and related to the frontal locations found by previous studies. The spatial and temporal variability of the frontal structure is then considered. The number of fronts is found to be highly variable throughout the Southern Ocean, increasing (‘splitting’) downstream of large bathymetric features and decreasing (‘merging’) in regions where the fronts are tightly controlled by the underlying topography. These splitting/merging events are related to changes in the underlying frontal structure whereby regions of high frontal occurrence cross or spread over streamfunction contours. In contrast to the number of fronts, frontal meandering remains relatively constant throughout the Southern Ocean. Little to no migration of the fronts over the 1993-2014 time period is found, and there is only weak sensitivity of frontal positions to atmospheric forcing related to the Southern Annular Mode or the El Ni?o Southern Oscillation. Finally, the implications of these results for the study of cross-stream tracer transport is discussed.
