Ontogenetic variation in Silurian eurypterids from Ontario and New York State

1994 ◽  
Vol 31 (4) ◽  
pp. 728-732 ◽  
Author(s):  
Michael B. Cuggy
Keyword(s):  
New York ◽  
New York State ◽  
Principal Component ◽  
Single Species ◽  
Southern Ontario ◽  
York State ◽  
Growth Series ◽  
Length Width ◽  
Upper Silurian ◽  
Biometrical Study

For more than 150 years, eurypterids from the Upper Silurian Bertie Formation of New York State and southern Ontario have been assigned to two species: Eurypterus remipes DeKay, 1825 and Eurypterus lacustris Harlan, 1834. These species have been distinguished on overall size and on the length–width ratios of the prosomas. To test the hypothesis that these taxa are simply ontogenetic variants of a single species, a biometrical study of more than 140 specimens from eight localities was performed. Bivariate plots of prosomal length versus width showed that E. remipes and E. lacustris morphs form a single ontogenetic growth series. Multivariate analysis using principal component analysis on nine measurement variables demonstrated that there is no basis for distinguishing between the two species on prosomal morphology. Accordingly E. lacustris is synonymized with E. remipes.

The salivary gland chromosomes of Prosimulium multidentatum Twinn and three forms included in Prosimulium magnum (Dyar and Shannon) (Diptera:Simuliidae)

1969 ◽  
Vol 47 (5) ◽  
pp. 943-949 ◽  
Author(s):  
P. O. Ottonen ◽  
Ramachandran Nambiar
Keyword(s):  
New York ◽  
Salivary Gland ◽  
Great Lakes ◽  
Sex Chromosomes ◽  
Species Complex ◽  
New York State ◽  
Great Lakes Region ◽  
Southern Ontario ◽  
York State ◽  
The Third

Further study of the morphology of salivary gland chromosome complements within the range described for Prosimulium magnum showed the species to consist of three cytologically distinct populations. The first two forms are without sex chromosomes, (1) a form analogous to the species chromosomal standard, P. magnum, (2) a form which is differentiated by the fixed inversion IIS-25, but (3) the third form has cytological XcYc sex determination. In the Great Lakes region these three forms of the P. magnum complex and P. multidentatum are sympatric in three separate areas, Michigan, Southern Ontario, and Western New York State. Natural hybrids between the forms have so far been obtained only infrequently, and the known hybrids are described. Some chromosomal aspects of speciation are discussed in relation to the present observations on the species complex.

Supernormal fluid pressures in sedimentary rocks of southern Ontario – western New York State

1992 ◽  
Vol 29 (1) ◽  
pp. 80-93 ◽  
Author(s):  
K. G. Raven ◽  
K. S. Novakowski ◽  
R. M. Yager ◽  
R. J. Heystee
Keyword(s):  
New York ◽  
Sedimentary Rock ◽  
New York State ◽  
Sedimentary Rocks ◽  
Fluid Pressure ◽  
Gas Migration ◽  
Southern Ontario ◽  
York State ◽  
Monitoring Wells ◽  
Pressure Transducers

Fluid pressures up to 1.7 times greater than hydrostatic have been measured in argillaceous Paleozoic rocks of low permeability in southern Ontario and western New York State. These supernormal formation fluid pressures were measured at depths of 50–310 m using submersible pressure transducers with straddle packers and multiple-packer casings isolating the test intervals. Measurements were obtained over periods of 7–46 months following casing installations. The pressure measurements from 11 monitoring wells are compiled and supporting hydrogeologic data for 5 selected wells are used as examples to illustrate the occurrence of supernormal fluid pressures in the Ordovician, Silurian, and Devonian sedimentary sequence of southern Ontario and western New York State. Possible explanations for the occurrence of supernormal fluid pressures in sedimentary rock are evaluated considering the available geologic and hydrogeologic information obtained from the monitoring wells. Based on this review, it is hypothesized that gas migration and accumulation from deeper distant sources via permeable vertical pathways is the most plausible explanation for the observed fluid pressures, although secondary contributions from local neotectonic activity are also possible. The implications of such supernormal fluid pressures on regional groundwater flow in sedimentary rocks and related activities such as waste disposal in sedimentary rock are briefly discussed. Key words : supernormal fluid pressure, sedimentary rocks, gas migration.

scholarly journals Network analysis of medical care services

2019 ◽  
Vol 26 (3) ◽  
pp. 1631-1658
Author(s):  
Jerome Niyirora ◽  
Ossayne Aragones
Keyword(s):  
New York ◽  
Network Analysis ◽  
Medical Care ◽  
New York State ◽  
Principal Component ◽  
Patterns Of Care ◽  
Clinical Protocols ◽  
York State ◽  
Care Services ◽  
Using Data

Medical care services can be organized into a network. Understanding the structure of this network cannot only help analyze common clinical protocols but can also help reveal previously unknown patterns of care. The objective of this research is to introduce the concept and methods for constructing and analyzing the network of medical care services. We start by demonstrating how to build the network itself and then develop algorithms, based on principal component analysis and social network analysis, to detect communities of services. Finally, we propose novel graphical techniques for representing and assessing patterns of care. We demonstrate the application of our algorithms using data from an Emergency Department in New York State. One of the implications of our research is that clinical experts could use our algorithms to detect deviations from either existing protocols of care or administrative norms.

The first diploaspidid (Chelicerata: Chasmataspidida) from North America (Silurian, Bertie Group, New York State) is the oldest species of Diploaspis

2016 ◽  
Vol 154 (1) ◽  
pp. 175-180 ◽  
Author(s):  
JAMES C. LAMSDELL ◽  
DEREK E. G. BRIGGS
Keyword(s):  
New York ◽  
New Species ◽  
North America ◽  
New York State ◽  
Taxonomic Diversity ◽  
Single Specimen ◽  
York State ◽  
Upper Silurian ◽  
A New Species

AbstractA single specimen of a new species of the chasmataspidid Diploaspis Størmer, 1972 is described from the upper Silurian (Pridoli) Phelps Member of the Fiddlers Green Formation (Bertie Group) in Herkimer County, New York State, USA. Diploaspis praecursor sp. nov. is distinguished by the shape of the posterolateral margins of the buckler, which are drawn out into angular epimera, and by the lack of elongate tubercles on the postabdomen. This discovery increases the taxonomic diversity of the Bertie Group by extending the geographic extent of Diploaspididae into North America. D. praecursor pre-dates previously known species of Diploaspis by more than 10 million years.

NEW MICROLEPIDOPTERA WITH NOTES

1944 ◽  
Vol 76 (8) ◽  
pp. 153-156 ◽  
Author(s):  
J. McDunnough
Keyword(s):  
New York ◽  
New York State ◽  
Food Plant ◽  
Southern Ontario ◽  
York State

For some time it has appeared to me that two species have been going under the above name. Heinrich in his revision gives the food-plant as Hamamelis but the few bred specimens in our collection from southern Ontario from larvae on this plant together with several captured specimens from New York State did not match Kearfott's description particularly well.

scholarly journals Red-winged blackbird aggression but not nest defense success is predicted by exposure to brood parasitism by brown-headed cowbirds

2015 ◽  
Author(s):  
Ken Yasukawa ◽  
Josie Lindsey-Robbins ◽  
Carol S. Henger ◽  
Mark E. Hauber
Keyword(s):  
New York ◽  
Host Species ◽  
New York State ◽  
Principal Component ◽  
Population Level ◽  
Nest Defense ◽  
Brood Parasite ◽  
York State ◽  
Northern Cardinal ◽  
South Central

The brown-headed cowbird (Molothrus ater) is an obligate brood parasite known to use over 200 host species. The red-winged blackbird (Agelaius phoeniceus) is a commonly used accepter host that incubates cowbird eggs and cares for cowbird nestlings and fledglings. This host species, however, may reduce the risk of parasitism with a frontloaded antiparasite strategy in which it attacks parasites that approach active host nests. To test this frontloaded parasite-defense hypothesis (FPDH), we presented taxidermic models of a female northern cardinal (Cardinalis cardinalis), which represents no threat to redwings, a male cowbird, which cannot lay a parasitic egg, and a female cowbird, together with species- and sex-specific vocalization playbacks for 5 min. We conducted these presentations at 25 active redwing nests at Newark Road Prairie in south-central Rock County, Wisconsin, USA, where 18% of redwing nests were parasitized by cowbirds in 2015. As predicted by the FPDH, the female cowbird mount elicited the most aggressive responses and the female cardinal mount the least aggressive, as measured by number of times more than one male redwing responded and number of times the male host attacked the mount, and by Principal Component analyses yielding redwing aggressive behavior and intimidation scores. Contrary to the predictions of FPDH regarding the success of nest defense behaviors, male redwings responding at naturally parasitized nests were significantly more likely to attack the mount than males with nests that were not parasitized. We also compared our results with those of a study using the same methods and conducted in New York State where cowbird parasitism was rare. Wisconsin redwings were more aggressive toward the female cowbird mount than redwings in New York State. Red-winged blackbirds appear to frontload their antiparasite defenses and the aggressiveness, but the apparent success of those defenses depends on individual and population-level experience with parasites.

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