scholarly journals SOUTHERNMOST OCCURRENCE OF THE SUWANNEE COOTER, PSEUDEMYS CONCINNA SUWANNIENSIS (TESTUDINES: EMYDIDAE)

2015 ◽  
pp. 53-59 ◽  
Author(s):  
George L. Heinrich ◽  
Dale R. Jackson ◽  
Timothy J. Walsh ◽  
David S. Lee
Keyword(s):  
United States ◽  
Gulf Of Mexico ◽  
Northwest Coast ◽  
Eastern United States ◽  
Southern Limit ◽  
The Status ◽  
Northeastern Gulf Of Mexico ◽  
Conservation Concern

The Suwannee Cooter, Pseudemys concinna suwanniensis, the largest member of the speciose turtle family Emydidae, inhabits a small number of rivers that drain into the northeastern Gulf of Mexico along the northwest coast of Florida from just west of Tallahassee to just south of Tampa. The status of this state-protected subspecies in the southernmost of these rivers, the Alafia, is unknown and hence of conservation concern. We provide recent evidence confirming that a reproducing population still exists in this river, and review available specimens and both published and unpublished records documenting the southern limit of distribution. At least within the eastern United States, our observations also extend confirmed knowledge of the geographic occurrence of hatchling turtles overwintering in the nest southward by 285 km.

System-wide seismic vulnerability of aging multiple-span multiple-girder bridges in low-to-moderate seismic hazard regions

2021 ◽  
Vol 37 (1_suppl) ◽  
pp. 1626-1651
Author(s):  
John E Lens M.EERI ◽  
Mandar M Dewoolkar ◽  
Eric M Hernandez M.EERI
Keyword(s):  
United States ◽  
Seismic Hazard ◽  
Cross Sections ◽  
Seismic Vulnerability ◽  
Time History ◽  
The United States ◽  
National Database ◽  
Eastern United States ◽  
Girder Bridges ◽  
The Status

This article describes the approach, methods, and findings of a quantitative analysis of the seismic vulnerability in low-to-moderate seismic hazard regions of the Central and Eastern United States for system-wide assessment of typical multiple span bridges built in the 1950s through the 1960s. There is no national database on the status of seismic vulnerability of bridges, and thus no means to estimate the system-wide damage and retrofit costs for bridges. The study involved 380 nonlinear analyses using actual time-history records matched to four representative low-to-medium hazard target spectra corresponding with peak ground accelerations from approximately 0.06 to 0.3 g. Ground motions were obtained from soft and stiff site seismic classification locations and applied to models of four typical multiple-girder with concrete bent bridges. Multiple-girder bridges are the largest single category, comprising 55% of all multiple span bridges in the United States. Aging and deterioration effects were accounted for using reduced cross-sections representing fully spalled conditions and compared with pristine condition results. The research results indicate that there is an overall low likelihood of significant seismic damage to these typical bridges in such regions, with the caveat that certain bridge features such as more extensive deterioration, large skews, and varied bent heights require bridge-specific analysis. The analysis also excludes potential damage resulting from liquefaction, flow-spreading, or abutment slumping due to weak foundation or abutment soils.

scholarly journals Investigating the Causes of Increased Twentieth-Century Fall Precipitation over the Southeastern United States

2018 ◽  
Vol 32 (2) ◽  
pp. 575-590 ◽  
Author(s):  
Daniel A. Bishop ◽  
A. Park Williams ◽  
Richard Seager ◽  
Arlene M. Fiore ◽  
Benjamin I. Cook ◽  
...  
Keyword(s):  
United States ◽  
Twentieth Century ◽  
Gulf Of Mexico ◽  
Specific Humidity ◽  
Precipitation Trend ◽  
Eastern United States ◽  
Atmospheric Models ◽  
Coupled Models ◽  
Fully Coupled ◽  
Precipitation Trends

Abstract Much of the eastern United States experienced increased precipitation over the twentieth century. Characterizing these trends and their causes is critical for assessing future hydroclimate risks. Here, U.S. precipitation trends are analyzed for 1895–2016, revealing that fall precipitation in the southeastern region north of the Gulf of Mexico (SE-Gulf) increased by nearly 40%, primarily increasing after the mid-1900s. Because fall is the climatological dry season in the SE-Gulf and precipitation in other seasons changed insignificantly, the seasonal precipitation cycle diminished substantially. The increase in SE-Gulf fall precipitation was caused by increased southerly moisture transport from the Gulf of Mexico, which was almost entirely driven by stronger winds associated with enhanced anticyclonic circulation west of the North Atlantic subtropical high (NASH) and not by increases in specific humidity. Atmospheric models forced by observed SSTs and fully coupled models forced by historical anthropogenic forcing do not robustly simulate twentieth-century fall wetting in the SE-Gulf. SST-forced atmospheric models do simulate an intensified anticyclonic low-level circulation around the NASH, but the modeled intensification occurred farther west than observed. CMIP5 analyses suggest an increased likelihood of positive SE-Gulf fall precipitation trends given historical and future GHG forcing. Nevertheless, individual model simulations (both SST forced and fully coupled) only very rarely produce the observed magnitude of the SE-Gulf fall precipitation trend. Further research into model representation of the western ridge of the fall NASH is needed, which will help us to better predict whether twentieth-century increases in SE-Gulf fall precipitation will persist into the future.

Vegetation East of the Rocky Mountains 18,000 Years Ago

1981 ◽  
Vol 15 (2) ◽  
pp. 113-125 ◽  
Author(s):  
H.E. Wright
Keyword(s):  
United States ◽  
Boreal Forest ◽  
New England ◽  
Jack Pine ◽  
Atlantic Coastal Plain ◽  
Reference Level ◽  
Eastern United States ◽  
Southern Limit ◽  
Southern Georgia ◽  
Narrow Belt

AbstractThe various lobes and segments of the southern periphery of the Laurentide ice sheet reached their maximum extension at different times between 21,000 and 14,000 yr ago, but the CLIMAP date of 18,000 yr ago is taken as a reference level to review the distribution of major vegetational formations in central and eastern United States. Tundra was apparently confined to a narrow belt peripheral to the ice margin only in the Minnesota area and from northern Pennsylvania to New England, with extensions down the crest of the Appalachian Highlands at least as far as Maryland. Some areas south of the Great Lakes may later have been marked by treeless vegetation briefly as the ice retreated. The boreal forest to the south in the central United States was dominated by spruce; the jack pine that had prevailed during previous times was apparently eliminated by the time the ice reached its maximum. In the Appalachian Highlands and the Atlantic Coastal Plain, however, jack pine occurred along with spruce, which decreased in importance southward. The southern limit of the boreal forest in the Southeast was perhaps somewhere in southern Georgia and Alabama. Oak and other temperate deciduous trees were minor components of the boreal coniferous forests especially in the southern Appalacchians, but there is no evidence yet in the southeastern states for a relic mixed mesophytic forest 18,000 yr ago similar to the rich modern deciduous forests of the region, except possibly in the Lower Mississippi Valley. The climate in much of the Southeast was apparently dry as well as cool at that time; in Florida oak/pine scrub and prairie-like openings prevailed, and all but the deepest lakes dried up.

scholarly journals The Status of Barrow's Golden-Eye in the Eastern United States

The Auk ◽  
1944 ◽  
Vol 61 (4) ◽  
pp. 544-554 ◽  
Author(s):  
Edwin M. Hasbrouck
Keyword(s):  
United States ◽  
Eastern United States ◽  
The Status

scholarly journals Marine leeches of the eastern United States and the Gulf of Mexico with a key to the species

1975 ◽  
Vol 9 (6) ◽  
pp. 633-667 ◽  
Author(s):  
Roy T. Sawyer ◽  
Adrian R. Lawler ◽  
Robin M. Oversrteet
Keyword(s):  
United States ◽  
Gulf Of Mexico ◽  
Eastern United States

On the True Identity of Arctogeophilus fulvus (Wood), With Some Remarks Concerning the Status of Mecistocephalus melanonotus Wood (Chilopoda: Geophilomorpha: Geophilidae)

1950 ◽  
Vol 82 (12) ◽  
pp. 253-256 ◽  
Author(s):  
Ralph E. Crabill
Keyword(s):  
United States ◽  
Original Description ◽  
Eastern United States ◽  
Incertae Sedis ◽  
The Status

In 1862 H. C. Wood described a new centipede, Mecistocephalus fulvus, which he found “not very abundantly” in the vicinity of Philadelphia. To my knowledge no subsequent worker has ever attempted to refer a centipede to this species, nor has fulvus ever been considered a synonym of any other species, so that for eighty-eight years it has been regarded privately or in print as being incertae sedis.The confusion surrounding this species has been due primarily to the following considerations: it has never been taken by anyone other than its author; the type is missing; it was highly improbable that this species could be referred to Mecistocephalidae, or even to Mecistocephalus, a genus represented in the eastern United States by a single imported species; and the original description itself refers to a centipede not quite like anything else known to occur in the east.

scholarly journals The Distribution of Giant Manta Rays In The Western North Atlantic Ocean Off The Eastern United States

2021 ◽  
Author(s):  
Nicholas A. Farmer ◽  
Lance P. Garrison ◽  
Calusa Horn ◽  
Margaret Miller ◽  
Timothy Gowan ◽  
...  
Keyword(s):  
United States ◽  
Gulf Of Mexico ◽  
Mississippi River ◽  
Oil And Gas ◽  
North Atlantic Ocean ◽  
Shelf Edge ◽  
Eastern United States ◽  
Multiple Sources ◽  
Cape Hatteras ◽  
Manta Birostris

Abstract In 2018, the giant manta ray (Manta birostris) was listed as threatened under the U.S. Endangered Species Act. We integrated decades of sightings and survey effort data from multiple sources in a comprehensive species distribution modeling (SDM) framework to evaluate the distribution of giant manta rays off the eastern United States, including the Gulf of Mexico. Manta rays were most commonly detected at productive nearshore and shelf-edge upwelling zones at surface thermal frontal boundaries within a temperature range of approximately 15–30 °C. SDMs predicted high nearshore concentrations off Northeast Florida during April, with the distribution extending northward along the shelf-edge as temperatures warm, leading to higher occurrences north of Cape Hatteras, North Carolina from June to October, and then south of Savannah, Georgia from November to March as temperatures cool. In the Gulf of Mexico, the highest nearshore concentrations were predicted near the Mississippi River delta from April to June and again from October to November. SDM predictions will allow resource managers to more effectively protect manta rays from fisheries bycatch, boat strikes, oil and gas activities, contaminants and pollutants, and other threats.

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