Time filter

Source Type

Potsdam, New York, United States

Swisher R.E.,University of Oklahoma | Westrop S.R.,University of Oklahoma | Amati L.,SUNY Potsdam
Journal of Paleontology

The Upper Ordovician (Sandbian-Katian) bathyurid trilobite Raymondites Sinclair is revised using new collections from Missouri and Ontario, and archival material from Illinois, Wisconsin, New York, and Ontario. Phylogenetic analysis supports monophyly of Raymondites, but recognition of this genus renders Bathyurus Billings paraphyletic. We treat Raymondites as a subgenus of Bathyurus and label the paraphylum of species traditionally assigned to the latter as Bathyurus sensu lato. Bathyurus (Raymondites) is composed of five previously named species, B. (R.) spiniger (Hall), B. (R.) longispinus (Walcott), B. (R.) ingalli (Raymond), B. (R.) bandifer Sinclair, and B. (R.) trispinosus (Wilson), and two new species, B. (R.) clochensis, and B. (R.) missouriensis; an eighth species is placed in open nomenclature. All species share tuberculate sculpture on the glabella, a relatively short palpebral lobe whose length is less than half of preoccipital glabellar length, and a pygidial outline that is well rounded posteriorly. Aside from the most basal species, B. (R.) longispinus, they also possess occipital spines and, where the pygidium is known, axial pygidial spines. © 2015, The Paleontological Society. Source

Schneider E.,SUNY Potsdam
Journal of Cases on Information Technology

This case details a classroom-based research and development project facilitated with management approaches adapted from the software industry to the classroom, specifically a combination of the methods generally known as 'Scrum' and 'Agile'. Scrum Management and Agile Software Development were developed in response to the difficulties of project management in the constantly changing world of technology. The on-going project takes a classroom of students and has them design and conduct research based on software tools they develop. An emphasis of the project is conducting research that involves all class members and makes students think critically about group management. Copyright © 2011, IGI Global. Source

Zimmer M.,Box 1603 | Schreer J. F.,SUNY Potsdam | Power M.,University of Waterloo
Ecology of Freshwater Fish

Abstract - Movement habits in riverine populations of brown trout vary among watersheds. Thus it is important to identify factors influencing differences in individual behaviour so as to improve the information resource base available for the design of river-specific management strategies. Such information is particularly needed in the rapidly urbanising watersheds of eastern North America where relatively little is known about anthropogenic influences on brown trout populations. In this study, we examined the influence of water temperature on brown trout behaviour in the Credit River in south-central Ontario, Canada with respect to seasonal movement patterns. Observed patterns of movement were also correlated with variations in river discharge and habitat quality. Forty-three radio-tagged, adult brown trout were tracked in a confined 39.8 km portion of the Credit River from 15 May 2002 to 28 July 2003. Fish were captured in three sections of the river that differed in distance downstream and habitat quality. Fish size had little impact on movement patterns. However, there was considerable variation in seasonal movement with upstream movements to summer positions, maintenance of summer positions, downstream and often extensive movements in fall. Also observed was maintenance of winter positions and repeated upstream movements in late spring-early summer to previously used summer positions. The elaborate movement behaviour in the Credit River population was attributed to seasonal changes in thermal habitat quality. Fish tagged in less suitable thermal habitats moved significantly more than fish from more suitable thermal habitats. © 2010 John Wiley & Sons A/S. Source

Brown J.,SUNY Potsdam | Godsil C.,University of Waterloo | Mallory D.,University of California at Berkeley | Raz A.,Wellesley College | Tamon C.,Clarkson University
Quantum Information and Computation

We study perfect state transfer of quantum walks on signed graphs. Our aim is to show that negative edges are useful for perfect state transfer. First, we show that the signed join of a negative 2-clique with any positive (n, 3)-regular graph has perfect state transfer even if the unsigned join does not. Curiously, the perfect state transfer time improves as n increases. Next, we prove that a signed complete graph has perfect state transfer if its positive subgraph is a regular graph with perfect state transfer and its negative subgraph is periodic. This shows that signing is useful for creating perfect state transfer since no complete graph (except for the 2-clique) has perfect state transfer. Also, we show that the double-cover of a signed graph has perfect state transfer if the positive subgraph has perfect state transfer and the negative subgraph is periodic. Here, signing is useful for constructing unsigned graphs with perfect state transfer. Finally, we study perfect state transfer on a family of signed graphs called the exterior powers which is derived from a many-fermion quantum walk on graphs. © Rinton Press. Source

Schreer J.F.,SUNY Potsdam | Lapierre J.L.,University of California at Los Angeles | Lapierre J.L.,Neurobiology Research 151 A3 | Hammill M.O.,Maurice Lamontagne Institute
Aquatic Mammals

Research on a captive harbor seal (Phoca vitulina) mother-pup pair showed that ingestion of milk caused a decrease in stomach temperature (Hedd et al., 1995). Herein the feasibility of stomach temperature telemetry for measuring nursing behavior was tested in wild harbor seal pups from the St. Lawrence River Estuary. Fifteen pups were outfitted with time-depth recorders, stomach temperature transmitters (STT), and stomach temperature recorders in 2002 and 2003. Twelve pups were recaptured, and seven yielded usable stomach temperature data. Excluding a mortality that lost its transmitter the day of release, transmitter retention time ranged from at least 7 to 22 d (12.5 ± 1.45 d) based on a STT signal at recapture. Pups that gained more weight had a higher frequency of decreases in stomach temperature (DST) (R 2 = 0.954, p < 0.001). Depth and external temperature data showed that most DST occurred while pups were "in the water"(57%) followed by "just before or after hauling out"(19%), "just before or after entering the water"(15%), and "hauled out"(9%) (χ 2 = 56.376, p < 0.001). The frequency DST did not change with age, and there was no diel pattern of DST, which also did not change with age. These findings indicate that transmitter retention times are sufficient to monitor most of the nursing period for harbor seals, that stomach temperature can be used to quantify nursing characteristics in the field, and that a telemetric technique is needed for harbor seals as most nursing events occur in the water. Source

Discover hidden collaborations