Evaluation of Pit-trap Transects With Varied Trap Spacing in a Northern Michigan Forest

The study compared effects of four distances between traps (range 0.5-4.0 m) on arthropod captures. Twelve traps were aligned in each of four transects, and 20 samples. trap were obtained during summer and fall in a northern Michigan deciduous forest. Catches proved to be unaffected by trap spacing. Rather, they reflected local within-site differences in abundance of dominant species

A Combinatorial Approach to Multiplicity-Free Richardson Subvarieties of the Grassmannian

We consider Buch's rule for K-theory of the Grassmannian, in the Schur multiplicity-free cases classified by Stembridge. Using a result of Knutson, one sees that Buch's coefficients are related to Moebius inversion. We give a direct combinatorial proof of this by considering the product expansion for Grassmannian Grothendieck polynomials. We end with an extension to the multiplicity-free cases of Thomas and Yong

\u3ci\u3eSminthurus Mencenbergae,\u3c/i\u3e New Species from Canada and Michigan (Collembola: Sminthuridae)

A new species, Sminthurus (Sminthurus) mencenbergar Snider, is described from Canada and Michigan

The Life Cycle Relative to Temperature of Protaphorura Armatus (Tullberg) (Collembola: Onychiuridae), a Parathenogenetic Species

Apparent parthenogenetic reproduction in Collembola has sometimes been attributed to accidental transfer of spermatophores with the food material from one culture to another (Schaller, 1953; Mayer, 1957). Conclusive evidence of parthenogenesis has only in recent years been accumulated for a number of species of Collembola, of which some were found in field populations consisting entirely of females (Choudhuri, 1958; Huther, 1961; Marshall and Kevan, 1962; Petersen, 1965; 1971 ; Snider, 1973). In Onychiuridae, parthenogenesis is apparently quite common. Onychiurus parthenogeneticus Choudhuri and Tullbergia krausbaueri (Bomer) undoubtedly reproduce in the absence of males (Choudhuri, 1958; Hale, 1966; Petersen, 1971); so does Tullbergia granulata Mills, where individuals reared in isolation from the time of hatching invariably lay viable eggs (unpublished observations). Large females of Onychiurus procampatus Gisin 1956 breed through a form of thelytokous parthenogenesis (Hale, 1964). The size groupings found in O. procarnpatus (two sizes of females and only small males) were also observed in O. firnatus Gisin 1952 and O. quadriocellatus Gisin 1947 and may indicate the existence of both parthenogenetic and sexually reproducing forms in these species (Hale, 1964). Recent laboratory observations on Protaphorura armatus (Tullberg) revealed that this species too reproduces parthenogenetically. The present study was undertaken to investigate the effect of temperature on the biology of the species

New Species of Sminthuridae from North America (Collembola: Symphypleona)

(excerpt) This account is the result of efforts by Drs. Kenneth Christiansen and Peter Bellinger to amass and examine the major collections of North American Collembola. Their work will culminate in a descriptive monograph on the Collembola-fauna of North America. The author agreed to describe part of the new species of Sminthuridae extracted from those collections. The analysis of specimens justifies erection of 17 species new to science

An Annotated List of the Collembola (Springtails) of Michigan

Excerpt: When work began on the Michigan Collembolain 1959, the Entomology Museum at Michigan State University included only one specimen of the order in its catalog of insects. The University of Michigan had a few vials of specimens determined by Harlow B. Mills, and a modest number was in the Robert R. Dreisbach collection at Midland, Michigan. At the beginning of my investigation very little was known about the order in Michigan, although monographs had been written on the collembolan faunae of the nearby s t a t e s of Minnesota (Guthrie, 1903), Iowa (Mills, 1934) and New York (Maynard, 1951). I expected to find species that had been recorded from surrounding areas, and hoped to find a few new to science. Both aims have been fulfilled. In addition, some European species are recorded from North America for the first time. These include Orchesella irregularilineata Stach, Tetracanthella montana Stach, Odontella lamellifera (Axelson), Sminthurinus bimaculatus Axelson, and Sminthrinus igniceps (Reuter). A new subspecific name i s proposed for Sminthurinus quadrimaculatus Maynard. The present paper lists 132 species and subspecies of 46 genera that occur in Michigan. New species will be described in the future. The present work follows a style s i m i l a r to that of Sherman Moore\u27s A Revised Annotated List of the Butterflies of Michigan (1960), except that keys to the genera and species have been included. The taxonomy follows that of Salmon (1964); thus instead of the usual two suborders, four a r e recognized

NCAR telemetry and command system

The development of a pulse code modulation data encoder, a computerized ground station, and a PCM command system for obtaining and reproducing data from a balloon-borne experiment is discussed. The components of the system and the manner of operation are described. The capabilities and limitations of the system are analyzed

Estimated accuracy of ground-based liquid water measurements during FIRE

Since on goal of the First ISCCP Regional Experiment (FIRE) project is to improve our understanding of the relationships between cloud microphysics and cloud reflectivity, it is important that the accuracy of remote liquid measurements by microwave radiometry be thoroughly understood. The question is particularly relevant since the uncertainty in the absolute value of the radiometric liquid measurement is greatest at low liquid water contents (less than 0.1 mm). However it should be stressed that although uncertainty exists in the absolute value of liquid, it is well known that the observed radiometric signal is proportional to the amount of liquid in the antenna beam. As a result, changes in amounts of liquid are known to greater accuracy than the absolute value, which may contain a bias. Here, an assessment of the liquid measurement accuracy attained at San Nicolas Island (SNI) is presented. The vapor and liquid water data shown were computed from the radiometric brightness temperatures using statistical retrieval algorithms. The retrieval coefficients were derived from the 69 soundings made by Colorado State University during the SNI observations. Sources of error in the vapor and liquid measurements include cross-talk in the retrieval algorithms (not a factor at low liquid contents), uncertainties in the brightness temperature measurement, and uncertainties in the vapor and liquid attenuation coefficients. The relative importance of these errors is discussed. For the retrieval of path-integrated liquid water, the greatest uncertainty is caused by the temperature dependence of the absorption at microwave frequencies. As a result, the accuracy of statistical retrieval of liquid depends to large measure upon how representative the a priori radiosonde data are of the conditions prevailing during the measurements. The microwave radiometer measurements at SNI were supplemented by an infrared (IR) radiometer modified for measurement of cloud-base temperature. Thus, the IR system provides the means to incorporate continuous measurements of the liquid temperature into the retrieval process

Arcturus user's guide

This document describes the Arcturus programming environment, a first realization of an advanced programming environment based on the programming language Ada. It is the first environment that supplies interactive, "statement (or declaration) at a time" execution of Ada program fragments

Intergenerational Narratives: The Personal is Professional

What began as a teacher-student relationship between educators Amy Brook Snider and Jodi Kushins has developed into a friendship and working partnership. At first, they did not consider their continuing long-distance connection as intergenerational. They shared experiences and exchanged ideas oblivious to the great difference in their ages. But as online tools, research, and communication emerged as a central focus of Jodi’s life and teaching, they became aware that this development might lead to an intergenerational digital divide between them. In order to explore their different responses to what has been called screen culture, they brought back their puppet alter egos for a presentation-cum-puppet show at the National Art Education Association conference in Chicago in 2016. This paper traces the history of the shifting relationship of two art educators, along with an extended excerpt from the script for their second puppet show