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Studies on Fresh-Water Byrozoa. XVII, Michigan Bryozoa
STUDIES ON FRESH-WATER BRYOZOA, XVII. MICHIGAN BRYOZOA MARY D. ROGICK, College of New Roche lie, New Rochelle, N. Y. AND HENRY VAN DER SCHALIE, University of Michigan, Ann Arbor, Mich. INTRODUCTION The purpose of the present study is to record the occurrence of several bryozoan species from localities new to Michigan and other regions; to compile a list of the bryozoa previously recorded from Michigan; and to correct or revise the identifica- tion of some of the species collected long ago. Records published by various writers from 1882 through 1949 have reported the following bryozoa from different Michigan localities, sometimes under synonyms or outmoded names: Class ECTOPROCTA Order GYMNOLAEMATA * Family Paludicellidae 1. Paludicella articulata (Ehrenberg) 1831 ORDER PHYLACTOLAEMATA Family Cristatellidae 2. Cristatella mucedo Cuvier 1798 Family Fredericellidae 3. Fredericella sultana (Blumenbach) 1779 Family Lophopodidae 4. Pectinatella magnifica Leidy 1851 Family PRimatellidae 5. Hyalinella punctata (Hancock) 1850 6. Plumatella casmiana Oka 1907 7. Plumatella or bis per ma Kellicott 1882 8. Plumatella repens (Linnaeus) 1758 9. Plumatella repens var. coralloides (Allman) 1850 10. Plumatella repens var. emarginata (Allman) 1844 11. Stolella indica Annandale 1909 The recorded localities for the above list of bryozoa are named in Table I. The sixteen references from which the Table was compiled are on file with both authors and are not here reproduced. To the above listed species the present study adds the following two new Michigan records: Class ECTOPROCTA Family Plumatellidae Plumatella repens var. jugalis (Allman) 1850 Class ENTOPROCTA Family Urnatellidae Urnatella gracilis Leidy 1851 In addition to the Urnatella gracilis and the Plumatella repens jugalis three other bryozoa (Paludicella articulata, Plumatella casmiana and Plumatella repens var. -
Temperature-Driven Proliferation of Tetracapsuloides Bryosalmonae in Bryozoan Hosts Portends Salmonid Declines
DISEASES OF AQUATIC ORGANISMS Vol. 70: 227–236, 2006 Published June 23 Dis Aquat Org Temperature-driven proliferation of Tetracapsuloides bryosalmonae in bryozoan hosts portends salmonid declines S. Tops, W. Lockwood, B. Okamura* School of Biological Sciences, Philip Lyle Research Building, University of Reading, Whiteknights, PO Box 228, Reading RG6 6BX, UK ABSTRACT: Proliferative kidney disease (PKD) is an emerging disease of salmonid fishes. It is pro- voked by temperature and caused by infective spores of the myxozoan parasite Tetracapsuloides bryosalmonae, which develops in freshwater bryozoans. We investigated the link between PKD and temperature by determining whether temperature influences the proliferation of T. bryosalmonae in the bryozoan host Fredericella sultana. Herein we show that increased temperatures drive the pro- liferation of T. bryosalmonae in bryozoans by provoking, accelerating and prolonging the production of infective spores from cryptic stages. Based on these results we predict that PKD outbreaks will increase further in magnitude and severity in wild and farmed salmonids as a result of climate-driven enhanced proliferation in invertebrate hosts, and urge for early implementation of management strategies to reduce future salmonid declines. KEY WORDS: Temperature · Climate change · Salmonids · Proliferative kidney disease · Myxozoa · Freshwater bryozoans · Covert infections Resale or republication not permitted without written consent of the publisher INTRODUCTION The source of PKD was obscure until freshwater bryozoans (benthic, colonial invertebrates) were iden- Disease outbreaks in natural and agricultural sys- tified recently as hosts of the causative agent (Ander- tems are increasing in both severity and frequency son et al. 1999), which was described as Tetracapsu- (Daszak et al. 2000, Subasinghe et al. -