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261 results for “Mississippi”
Figures 21-25 in The variegated mud-loving beetles (Coleoptera: Heteroceridae) of Mississippi and Alabama, with discussion and keys to the species occurring in the southeastern United States
Figures 21-25. Habiti of Heterocerus species of intermediate size with post-mesocoxal lines. 21) H. schwarzi. 22) H. tenuis. 23) H. undatus. 24) H. texanus. 25) H. collaris. Scale line = 1mm.
Figures 18-20 in The variegated mud-loving beetles (Coleoptera: Heteroceridae) of Mississippi and Alabama, with discussion and keys to the species occurring in the southeastern United States
Figures 18-20. Habiti of large Heterocerus species with post-mesocoxal lines. 18) H. insolens. 19) H. sinuosus. 20) H. mollinus. Specimens 20a and 20c are hypermandibulate. Scale line = 1mm.
Figures 30-31 in The variegated mud-loving beetles (Coleoptera: Heteroceridae) of Mississippi and Alabama, with discussion and keys to the species occurring in the southeastern United States
Figures 30-31. Habiti of two widespread species reported to occur in the southeastern USA. 30) Augyles auromicans. 31) Heterocerus fenestratus. Scale line = 1mm.
Figures 11-17 in The variegated mud-loving beetles (Coleoptera: Heteroceridae) of Mississippi and Alabama, with discussion and keys to the species occurring in the southeastern United States
Figures 11-17. Habiti of large Heterocerus species lacking post-mesocoxal lines. 11) H. pallidus (male is hypermandibulate). 12) H. intermuralis (male is hypermandibulate). 13) H. fatuus. 14) H. gnatho. 15) H. longilobulus. 16) H. sandersoni. 17) H. angustatus.Scale line = 1mm.
Atchafalaya shelf velocity data from May 2011 during a Mississippi River flood period
<p>Current velocity measured over the Atchafalaya shelf by an ADCP mounted on from R/V Pelican during the Mississippi River flood period in May 2011.</p>
MarTREC Publication forBio-Inspired Stabilization of Levee Slope on Expansive Yazoo Clay at the Maritime and Multimodal Transportation Infrastructure in Mississippi
<p>The link considers the data file for the MarTREC Project: Bio-Inspired Stabilization of Levee Slope on Expansive Yazoo Clay at the Maritime and Multimodal Transportation Infrastructure in Mississippi.</p> <p>PI: Dr. Sadik Khan</p> <p>Funding Agency: This material is based upon work supported by the U.S. Department of Transportation under Grant Award Number DTRT13-G-UTC50. The work was conducted through the Maritime Transportation Research and Education Center at the University of Arkansas.</p>
Fluvial geomorphic evolution and stream fish community trajectories in the Bayou Pierre, Mississippi
<p>Changing environments place stresses on ecosystems, and are contributing to widespread losses of biodiversity and ecosystem function. Comparisons of historical and contemporary data offer considerable utility in understanding how ecosystems respond to, adapt to, or recover from changing environments. Stream fishes offer a particularly interesting study system for this topic, as streams are naturally dynamic environments and human needs have placed increasing pressure on aquatic systems. The effects of fine sediments on stream fishes and aquatic ecosystems more broadly have been well studied. Yet studies from fluvial geomorphology have resulted in models of watershed morphological evolution which encompass far broader processes and changes to aquatic systems. Our dataset integrates a fluvial geomorphic approach to characterize stream channel and habitat evolution over a four decade period in the Bayou Pierre, Mississippi, an ecological approach to study related change in stream fish communities in the same watershed, and analyses linking the two. Fluvial geomorphic processes were characterized both from remote sensing data sources for historic and contemporary time periods, and local fish habitat data for contemporary time periods. Historical fish community data were extracted from museum records, and contemporary fish community data were collected via sampling for fishes at the same localities as historic efforts using similar methods.</p>
Fluvial geomorphic evolution and stream fish community trajectories in the Bayou Pierre, Mississippi
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Variability in the discharge of the Mississippi River and tributaries from 1817 to 2020
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Decade-scale stream morphology and stream fish community structure in headwater streams draining Mississippi's National Forests
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Proximal and ultimate influences on planform change in Bayou Pierre, Mississippi
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Planform change and Fundulus SNP data for small watersheds in South Mississippi and Louisiana
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Anthropogenic nitrogen Balance and Riverine Nitrogen Footprint of Agriculture in the Mississippi-Atchafalaya River Basin during 1970-2019
These data support the findings of a manuscript by Lu et al. under review in Environmental Research Letters. We used data synthesis and a well-calibrated hydro-ecological model to quantify the dynamics and controls of the riverine N footprint (RNF) within the Mississippi-Atchafalaya River Basin (MARB) from 1970 to 2019. These supportive data include (1) Annual synthetic N fertilizer and manure N input from 1970 to 2019 in sub-basins in the MARB; (2) Annual N inputs, outputs, and N balance from 1970 to 2017 in the MARB; (3) Changes in crop production, N load and riverine N footprint in response to key agricultural activities in MARB; (4) Changes in crop production, N load, and riverine N footprint under key agricultural activities at sub-basin level; (5) Annual acreage of major grain crops and total cropland areas in sub-basins of the MARB.
Data from: Evaluation of mowing frequency on right-of-way plant communities in Mississippi
Abstract: Native grasses and native wildflowers are declining, especially along roadside right-of-ways due to intensive mowing and herbicide management practices. Roadside right-of-ways undergo regular disturbances such as mowing, maintenance, and road developments that affect soils, groundwater, surface hydrology, and vegetation composition. We investigated species richness and percent coverage within plant communities along highway right-of-ways to determine if reduced mowing increased native plant coverage. The study was conducted using 10 research plots situated along Highway 25 in Oktibbeha and Winston counties, Mississippi. Each research plots consisted of three different treatments as follows: one that included greater than four mowings per year, one mowing only in fall, and one mowing only in fall with a supplemental native wildflower seeding. Using line transect sampling, we detected 277 plant species, which included native and non-native forbs, legumes, grasses, rushes, sedges, and woody perennials (vines, shrubs, and trees). Total percent coverage of native and non-native plants within different growth form categories did not differ among treatments (F2, 96 = 0.45, P = 0.83). However, coverage differed between uplands and lowlands (F1, 96 = 18.22, P {less than or equal to} 0.001), between years (F1, 96 = 14.54, P {less than or equal to} 0.001), between fall and spring seasons (F1, 96 = 16.25, P {less than or equal to} 0.001), and interacted between years and seasons (F1, 96 = 24.08, P {less than or equal to} 0.001) and seasons and elevations (F1, 96 = 5.00, P {less than or equal to} 0.001). Non-native agronomic grasses exhibited the greatest coverage ({greater than or equal to}90%) in all treatments. Percent coverage of each plant growth form was greatest in lowlands. Our research showed an increase of native grasses and wildflower species along roadsides with a reduced mowing regimen. We concluded that the timing and intensity of mowing for the duration of our study had little effect on the species composition of plant communities. However, one mowing per year retained agronomic plant coverage for erosion control and soil stabilization during roadside maintenance. Specific proactive management implementations can include native plantings, selective herbicide use to decrease non-native grasses, continual mowing from roadside edge to 10 meters (m), and only one mowing in late fall, but with an extension of the boundary to reach beyond 10 m from the roadside edge to suppress the invasion of woody plants, which could lead to lower long-term maintenance costs.
RAPID input files corresponding to the Mississippi River Basin using the NHDPlus v2 Dataset
<p><strong>Corresponding peer-reviewed publication</strong></p> <p>This dataset corresponds to RAPID input files that were used in study published by Journal of American Water Resources Association (JAWRA):</p> <p>Tavakoly, A. A., A. D. Snow, C. H. David, M. L. Follum, D. R. Maidment, and Z.-L. Yang, (2016) "Continental-Scale River Flow Modeling of the Mississippi River Basin Using High-Resolution NHDPlus Dataset", Journal of the American Water Resources Association (JAWRA) 1-22. DOI: 10.1111/1752-1688.12456</p> <p><em>Please cite the aforementioned article and the dataset herein, when using of any of these files in this dataset.</em></p>
Long-term minnow community data from the Bayou Pierre, Mississippi
<p>Long-term community monitoring is becoming an important tool for ecological studies. Historical data are present in a variety of sources but often require considerable effort to extract, filter, and verify prior to analyses. In this dataset we document minnow (sensu lato, Cyprinidae + Leuciscidae) communities in the Bayou Pierre, Mississippi. We include filtered community data from twelve localities and three time periods (1974-75, 1985-89, 2019-20) derived from a mixture of literature, museum collections, and contemporary collecting efforts. All collections were made using comparable methodologies. We also include an additional 29 contemporary collections which do not have historical representation but which cover the majority of the watershed. We further include a trait database coded from literature values which captures both reproductive and ecological traits for the species in these data. These data were used in preparation of a manuscript examining long-term taxonomic, ecological, and functional change within the minnows in the Bayou Pierre, and they are part of a broader research effort to study the effects of fluvial geomorphic evolution on aquatic ecosystems.</p>
A new, narrowly endemic species of swamp-dwelling dusky salamander (Plethodontidae: Desmognathus) from the Gulf Coastal Plain of Mississippi and Alabama
<p>We describe a new, narrowly endemic species of swamp-dwelling dusky salamander (Plethodontidae: Desmognathus pascagoula sp. nov.) from the Gulf Coastal Plain of southeastern Mississippi and southwestern Alabama based on linear morphometrics, mitochondrial DNA, and single nucleotide polymorphisms from 881 loci produced using genotype-by-sequencing. Some populations of the new species were historically referred to as D. auriculatus, a polyphyletic assemblage of at least three species in the Atlantic and Gulf Coastal Plain from Texas to North Carolina. Populations of D. auriculatus from the Gulf Coastal Plain in Louisiana and Mississippi were recently described as D. valentinei. The new species includes populations that were tentatively referred to D. valentinei, but we find it is morphologically, genetically, and geographically distinct. It is smaller, has a more defined dorsal color pattern, more irregular whitish "portholes" in up to three rows on the lateral surfaces of the body and tail, and a brighter orange or yellowish orange postocular stripe. At present, the new species is known from only six extant populations in the lower Pascagoula, Escatawpa, and Mobile drainages. The latter represents a distinct phylogeographic lineage. We also refer a historical collection from the northeastern side of the Mobile-Tensaw River Delta to this species, suggesting a much broader range in the past. We suspect that more populations remain to be discovered in the area, and their potential species-level distinctiveness should be tested further. This discovery increases knowledge of the biodiversity in the southeastern United States Coastal Plain, a candidate region meeting the global criteria for a "biodiversity hotspot," and underscores the amount of cryptic diversity likely remaining to be discovered and described in Nearctic salamanders.</p>
Low levels of hybridization between domestic and wild Mallards wintering in the Lower Mississippi Flyway
<p>Mallard ducks are a ubiquitous and socio-economically important game bird in North America. Despite their generally abundant midcontinent population, Mallards in eastern North America are declining, which may be partially explained by extensive hybridization with human-released domestically-derived game-farm Mallards. We investigated the genetic composition of Mallards in the middle and lower Mississippi flyway, key wintering regions for the species. We found that nearly 30% of wild Mallards carried mitochondrial haplotypes derived from domestic mallards present in North America, indicating that the individuals had female game-farm Mallard lineage in their past; however nuclear results identified only 4% of the same sample set as putative hybrids. Recovering 30% of samples with OW A mtDNA haplotypes is concordant with general trends across the Mississippi flyway and this percentage was stable across Mallards we sampled a decade apart. The capture and perpetuation of OW A mtDNA haplotypes is likely due to female breeding structure, whereas reversal of the nuclear signal back to wild ancestry is due to sequential backcrossing and lower and/or declining admixture with game-farm Mallards. Future studies of wild ancestry of Mississippi flyway Mallards will benefit from coupling molecular and spatial technology across flyways, seasons, and years to search for potential transitions of Mallard populations with different genetic ancestry, and whether the genetic ancestry is somehow linked to an individual's natal and subsequent breeding location.</p>
Morphometrics of mallards in the Lower Mississippi Alluvial Valley and associated climate variables from 1979-2021
<p>Body mass in overwintering waterfowl is an important fitness attribute as it affects winter survival, timing of spring migration, and subsequent reproductive success. Recent research in Europe and the western United States indicates body mass of mallards (<em>Anas platyrhynchos</em>) has increased from the late 1960s to early 2000s. The underlying mechanism is currently unknown; however, researchers hypothesize that increases are due to a more benign winter climate, increased food availability through natural and artificial flooding, introgression of wild mallard populations by game-farm mallards, or shifting of wintering distributions northward. Further investigation of factors related to winter mallard body mass increases and whether this phenomenon is occurring in other major flyways could increase understanding of intrinsic and extrinsic variables influencing waterfowl fitness. We collected and analyzed mallard body mass data in the Lower Mississippi Alluvial Valley from 1979 to 2021 to determine sources of temporal variation. We measured hunter-harvested mallards from private hunting clubs, public hunting areas, and duck-plucking businesses. Mallard body mass increased by approximately 6% among all age-sex classes from 1979 to 2021. We also compiled weather data (rainfall [cm], weather severity index information [WSI], river gage discharge [cfs] and height [m]) to relate to mallard body mass measurements.</p>
Sea turtle relative abundance in nearshore waters adjacent to the Mississippi River delta, Gulf of Mexico, United States
<p><span>We measured the relative abundance of sea turtles using standardized transect surveys conducted during the summer and fall of 2013 in neritic waters surrounding the Mississippi River delta in Louisiana, USA. Data comprise sea turtle locations, observation circumstances, and environmental covariates recorded at the beginning of each transect and at the time of each turtle observation. Turtles were recorded by species and size class, as well as location in the water column and the distance the turtle was from the transect line. Transects were performed on an 8.2-meter vessel with two observers atop a 4.5-meter elevated platform, with vessel speed standardized at ~15 km/hr. These data are the first to describe relative abundance of sea turtles observed from small vessels in this region. Detection of turtles <45 cm SSCL and data detail are greater than aerial surveys. The data serve to inform resource managers and researchers regarding these protected marine species. </span></p>
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