Predatory Impact of Exotic Cladoceran Cercopagis pengoi on the Zooplankton of Lake Ontario

This investigation into the impact of Cercopagis on the zooplankton community of Lake Ontario was a collaborative project between Corey Laxson and Dr. Joe Makarewicz of the Limnology Lab at SUNY College at Brockport, and Kerry McPhedran and Dr. Hugh Maclsaac of The Great Lakes Institute for Environmental Research at the University of Windsor, Ontario. The project was funded by a research Grant from New York State Sea Grant. K. McPhedran and Dr. Maclsaac performed all the laboratory experiments on the feeding of Cercopagis at the University of Windsor. For further information on the predation experiments see: Predation by the exotic cladoceran Cercopagis pengoi on the zooplankton community of Lake Ontario a Thesis by K. McPhedran, 2001. Department of Biological Sciences, University of Windsor, Windsor Ontario.Despite growing knowledge of the ecology of Cercopagis in North America, little information exists on its effects on the composition and abundance of zooplankton and phytoplankton. I assessed the impact of Cercopagis on the lower food-web of Lake Ontario by analyzing the historical and seasonal abundance of the crustacean zooplankton, by conducting laboratory feeding experiments, and by estimating consumption demand of Cercopagis based on bioenergetic considerations. A comparison of average pre-and post-invasion abundances of Daphnia retrocurva, Bosmina longirostris and Diacyclops thomasi suggests that Cercopagis is having a major effect on zooplankton abundance in the lake. In the laboratory Cercopagis fed on a number of zooplankton including the rotifer Asplanchna priodonta and the cladocerans, Daphnia retrocurva, Bosmina longirostris, Ceriodaphnia lacustris, Scapheloberis kingi, and Leptodora kindtii. Between 1999 and 2001 decreases in the abundance of common members of the zooplankton community coincided with an increase in the abundance of Cercopagis. Daphnia retrocurva populations declined despite high birth rates in all three years, indicating that food limitation was not responsible for the patterns. Chlorophyll-a concentration generally increased concomitant with declines in cladoceran zooplankton abundance. Consumption demand of average mid-summer populations of Cercopagis, estimated from the bioenergetic model of confamilial Bythotrephes, were sufficient to decimate much of the crustacean community in a few days. Predatory effects exerted by Cercopagis on the Lake Ontario zooplankton community have decreased steadily since the species was established in the lake.SUNY BrockportEnvironmental Science and BiologyMaster of Science (MS)Environmental Science and Ecology These

Within and between person effects of learning agility: a longitudinal examination of how learning agility impacts future career success

2018 Summer.Includes bibliographical references.The business environment is highly complex and constantly evolving. Previous research on learning agility has demonstrated support for its use in identifying high potential leaders who can adapt effectively to the evolving business environment. The purpose of this study was to provide further evidence of the construct validity of learning agility and applicability in assessing leadership potential. Learning agility was examined within a broader nomological network of related constructs—a framework developed by DeRue, Ashford, & Myers (2012). It was hypothesized that personality would predict learning agility and learning agility would predict performance and learning over time. The results demonstrate partial support for these hypotheses. Several personality variables (e.g., Openness to Experience) were significantly related to learning agility. Further, learning agility was found to predict performance and learning, but not the rate at which these factors changed over time

Predatory Impact of Exotic Cladoceran Cercopagis pengoi on the Zooplankton of Lake Ontario

Despite growing knowledge of the ecology of Cercopagis in North America, little information exists on its effects on the composition and abundance of zooplankton and phytoplankton. I assessed the impact of Cercopagis on the lower food-web of Lake Ontario by analyzing the historical and seasonal abundance of the crustacean zooplankton, by conducting laboratory feeding experiments, and by estimating consumption demand of Cercopagis based on bioenergetic considerations. A comparison of average pre-and post-invasion abundances of Daphnia retrocurva, Bosmina longirostris and Diacyclops thomasi suggests that Cercopagis is having a major effect on zooplankton abundance in the lake. In the laboratory Cercopagis fed on a number of zooplankton including the rotifer Asplanchna priodonta and the cladocerans, Daphnia retrocurva, Bosmina longirostris, Ceriodaphnia lacustris, Scapheloberis kingi, and Leptodora kindtii. Between 1999 and 2001 decreases in the abundance of common members of the zooplankton community coincided with an increase in the abundance of Cercopagis. Daphnia retrocurva populations declined despite high birth rates in all three years, indicating that food limitation was not responsible for the patterns. Chlorophyll-a concentration generally increased concomitant with declines in cladoceran zooplankton abundance. Consumption demand of average mid-summer populations of Cercopagis, estimated from the bioenergetic model of confamilial Bythotrephes, were sufficient to decimate much of the crustacean community in a few days. Predatory effects exerted by Cercopagis on the Lake Ontario zooplankton community have decreased steadily since the species was established in the lake

Measure, Cut, Stitch

[32] leaves : ill. Cover title. printed by serigraphy and typography. Edition of 75. This book is number 71 --Colophon. Signed by the artist.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1006/thumbnail.jp

Measurism

[20] pages : ill. Cover title. Edition: 10 --Colophon. Library has copy no. 9. Signed by the artist.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1008/thumbnail.jp

Playfulness Works

[16] leaves : [8] color illustrations Cover title. Title printed on plastic covers. Alternate leaves are semi-transparencies with text. The intaglio images and the book text were printed by the artist. The type was hand set in 14 pt. Baskerville italic and printed on Millers Falls onion skin paper. All intaglio images were printed on Murillo paper. Edition 12 --Colophon. This book is number 7 Signed by the artist.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1011/thumbnail.jp

Retail the Tale

[25] pages : ill. (some color) Printed Feb. \u2796 - Feb. 97, typography, drawing, etching with chine colle on RIves BFK and UV Ultra 11 --Colophon. Edition limited to 15 copies, signed by the author. Oriental style binding (traditional format, Japanese). Library has copy no. 13.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1013/thumbnail.jp

Muse Measures

[53] pages : ill. Limited edition of 150 copies. Cover title. Letterpress artist\u27s book created by Ruth Laxson. Binding is Japanese side-sewn style. Printed on Birch Royal Fiber, UV Ultra II and Warren Patina, using typography, type-high engraving and offset. The type is mainly Caslon and Franklin Gothic. It was hand set and composed on the press bed. --Colophon. Typographical illustrations are combinations of letters, lines, symbols, and drawings. White paint applied to two images. Library has copy no. 60 signed by the artist.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1009/thumbnail.jp

Some Things are Sacred

[26] pages : ill. Title in red on cover. Oriental style binding (traditional format, Japanese). Text in paper binder. Edition: 50. This book is number 47. --Colophon. Signed by the artist.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1014/thumbnail.jp

Letters to the Ether/Other

[14] pages (6 folded) Consists of a series of folded printed leaves between envelope-shaped papers. Cover title. These Letters to the Ether Other first existed as one-of-a-kind, bas relief wall pieces. They read black-on-black with red & are constructed of paper, wood, metal, wire & paint. They were part of a solo exhibit in 1995 which included mail box sculptures & mail art. This small edition is a spin off of that work ... printed while the hand-set type was still in tack [sic] on various papers found around the studio --page [1]. Edition of 10. This is copy no. 8. Signed by the artist.https://digitalcommons.risd.edu/specialcollections_artistsbookscollection_ruthlaxsonarchive/1005/thumbnail.jp