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79 results for “historical and contemporary”
FIG. 1 in Contemporary and Historical Species Relationships Reveal Assembly Mechanism Intricacies among Co-occurring Darters (Percidae: Etheostomatinae)
FIG. 1. Schematic diagram depicting influences of habitat filtering and/or competitive exclusion and the hypothetical data patterns generated by these two mechanisms across three assembly scenarios. Interpretation of data patterns for each scenario is influenced by the presence of niche conservatism (i.e., whether closely related species have retained ecologically important ancestral traits) or by the presence of convergence in habitat use among co-occurring species. Regional species pool phylogenies and the predicted scenario outcomes are encompassed by boxes (A, B, and C). Darter morphology is shown primarily by the darter silhouettes on the tree tips, and secondarily by darter color shade. Therefore, darter morphology is depicted as conserved in all three scenarios. Habitat use for each ''species'' is indicated by the size of the boxes located above each darter depiction in each scenario (e.g., darters with similar sized boxes have similar habitat use). Hypothetical assemblages containing four species each are depicted below each regional species phylogeny, and active assembly mechanisms related to each assemblage outcome (habitat filtering or competitive exclusion) are indicated to the left. Associated phylogenetic (phylo) and habitat use (habitat) patterns are indicated by the terms ''clustering'' or ''evenness'' within each possible outcome.
Data from: Echoes of a distant time: effects of historical processes on contemporary genetic patterns in Galaxias platei in Patagonia
Interpreting the genetic structure of a metapopulation as the outcome of gene flow over a variety of timescales is essential for the proper understanding of how changes in landscape affect biological connectivity. Here we contrast historical and contemporary connectivity in two metapopulations of the freshwater fish Galaxias platei in northern and southernmost Patagonia where paleolakes existed during the Holocene and Pleistocene, respectively. Contemporary gene flow was mostly high and asymmetrical in the northern system while extremely reduced in the southernmost system. Historical migration patterns were high and symmetric in the northern system and high and largely asymmetric in the southern system. Both systems showed a moderate structure with a clear pattern of isolation by distance (IBD). Effective population sizes were smaller in populations with low contemporary gene flow. An approximate Bayesian computation (ABC) approach suggests a late Holocene colonization of the lakes in the northern system and recent divergence of the populations from refugial populations from east and west of the Andes. For the southern system, the ABC approach reveals that some of the extant G. platei populations most likely derive from an ancestral population inhabiting a large Pleistocene paleolake while the rest derive from a higher-altitude lake. Our results suggest that neither historical nor contemporary processes individually fully explain the observed structure and geneflow patterns and both are necessary for a proper understanding of the factors that affect diversity and its distribution. Our study highlights the importance of a temporal perspective on connectivity to analyse the diversity of spatially complex metapopulations.
Data from: Historic and contemporary use of catfish aquaculture by piscivorous birds in the Mississippi Delta
<p>This dataset contains data used in the manuscript "Historic and contemporary use of catfish aquaculture by piscivorous birds in the Mississippi Delta", published in The Condor: Ornithological Applications. All data were collected in northwest Mississippi during winters (October - April) of 2000-2001, 2003-2004, 2015-2016, 2016-2017, and 2017-2018. Two primary types of data are present: 1) roost surveys, and 2) aquaculture cluster surveys. Roost surveys were aerial surveys in which all known double-crested cormorant night roosts in northwest Mississippi were surveyed and cormorants were counted. Roost survey data can be found in the "Cormorant_Roost_Survey_Counts.xlxs" file. For the aquaculture cluster surveys, clusters were defined as U.S. Geological Survey land survey sections that contained aquaculture. For each year of data, a random subset of these clusters were chosen to be aerial surveyed and double-crested cormorants, great blue herons, and great egrets were recorded per cluster. Basic descriptive statistics of the clusters can be found in the "Cluster_Descriptive_Stats.xlxs" file. The "Historic_vs_Contemporary_Cormorants.xlxs" file was used to compare cormorant density on aquaculture clusters between the historic period (2000-2001, 2003-2004) and contemporary period (2015-2016, 2016-2017, and 2017-2018). Lastly, the "Cluster_Survey_Data_Contemporary.xlxs" file contains data recorded during the contemporary period only, and other variables regarding the clusters are also present.</p>
Figure 3 in Contemporary genetic structure reflects historical drainage isolation in an Australian snapping turtle, Elseya albagula
Figure 3. Bayesian population assignments for Elseya albagula individuals based on 12 microsatellite loci analysed in STRUCTURE, indicating structure by region and catchment. Individuals are represented by coloured vertical bars, which represent per cent genetic membership (y axis) within genetic units as indicated above each diagram. A, individual differentiation between two regional units (K = 2), and B, further substructuring amongst catchments within the southern region (K = 3). Black lines separate sampling locations, identified below (x axis). B, Burnett, F, Fitzroy; M, Mary.
Supplementary material 3 from: Ramírez-Bautista A, Torres-Hernández LA, Cruz-Elizalde R, Berriozabal-Islas C, Hernández-Salinas U, Wilson LD, Johnson JD, Porras LW, Balderas-Valdivia CJ, González-Hernández AJX, Mata-Silva V (2023) An updated list of the Mexican herpetofauna: with a summary of historical and contemporary studies. ZooKeys 1166: 287-306. https://doi.org/10.3897/zookeys.1166.86986
Territorial area, percentage territorial of county, and total number of species of amphibians, reptiles, and herpetofauna of each state in Mexico
Data from: Historical divergence versus contemporary gene flow: evolutionary history of the calcicole Ranunculus alpestris group (Ranunculaceae) in the European Alps and the Carpathians
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Data from: Comparative analysis indicates historical persistence and contrasting contemporary structure in sympatric woody perennials of semi-arid south-west Western Australia
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Data from: Historical processes and contemporary ocean currents drive genetic structure in the seagrass Thalassia hemprichii in the Indo-Australian Archipelago
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Data from: Global gradients in vertebrate diversity predicted by historical area-productivity dynamics and contemporary environment
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Data from: Evidence for contemporary and historical gene flow between guppy populations in different watersheds, with a test for associations with adaptive traits
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Data from: Contemporary and historic factors influence differently genetic differentiation and diversity in a tropical palm
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Disentangling the contemporary and historical effects of landscape on population genomic variation of two bird species restricted to the highland forest enclaves of northeastern Brazil
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Data from: Inferring contemporary and historical genetic connectivity from juveniles
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Regional assemblages shaped by historical and contemporary factors: evidence from a species-rich insect group
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Data from: Patterns of genetic differentiation in Colorado potato beetle correlate with contemporary, not historic, potato land cover
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Data from: Spatial genetic structure of the mountain pine beetle (Dendroctonus ponderosae) outbreak in western Canada: historical patterns and contemporary dispersal
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Data from: Genetic structure in the European endemic seabird, Phalacrocorax aristotelis, was shaped by a complex interaction of historical and contemporary, physical and non-physical drivers
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A molecular phylogeny of historical and contemporary specimens of an under-studied micro-invertebrate group
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Data from: The influence of contemporary and historic landscape features on the genetic structure of the sand dune endemic, Cirsium pitcheri (Asteraceae)
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Data from: Historic and contemporary use of catfish aquaculture by piscivorous birds in the Mississippi Delta
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