A taxonomic reevaluation of North American Daphnia (Crustacea: Cladocera). III. The D. catawba complex

1997 ◽  
Vol 75 (8) ◽  
pp. 1254-1261 ◽  
Author(s):  
Paul D. N. Hebert ◽  
Terrie L. Finston
Keyword(s):  
North America ◽  
New England ◽  
Common Ancestor ◽  
Genotypic Diversity ◽  
Species Boundaries ◽  
Eastern North America ◽  
Eastern Canada ◽  
Cyclic Parthenogenesis ◽  
Forest Regions ◽  
Daphnia Catawba

Despite the importance of Daphnia in freshwater zooplankton assemblages, species boundaries in the genus are unclear. This study verifies the taxonomic validity of D. catawba by establishing its genetic divergence from other species of Daphnia that occur in eastern North America. In addition, it reveals the presence of a second, closely allied species, D. minnehaha, which had previously been placed in synonomy with D. pulex. Daphnia catawba and D. minnehaha share a preference for acidic habitats and are restricted to the deciduous and boreal forest regions of the eastern portion of the continent, where D. catawba is restricted to lakes, while D. minnehaha occurs in ponds. Both species reproduce by cyclic parthenogenesis and, based on the extent of their allozyme differentiation, last had a common ancestor more than 7 million years ago. Populations of D. minnehaha fall into two genetic clades; those from the Great Lakes watershed are morphologically divergent and have much lower levels of genotypic diversity than those from eastern Canada and the New England states.

scholarly journals Do Barrow's Goldeneyes, Bucephala islandica, Breed South of the St. Lawrence Estuary in the Gaspé Peninsula, Eastern Canada?

2010 ◽  
Vol 124 (2) ◽  
pp. 179
Author(s):  
Jean-François Ouellet ◽  
Pierre Fradette ◽  
Isabel Blouin
Keyword(s):  
North America ◽  
Breeding Season ◽  
Breeding Habitat ◽  
Eastern North America ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
North Shore ◽  
The North ◽  
Bucephala Islandica ◽  
St Lawrence Estuary

We report the first observations of Barrow's Goldeneyes south of the St. Lawrence estuary in typical breeding habitat during the breeding season. Until recently, the confirmed breeding locations for the species in Eastern North America were all located on the north shore of the Estuary and Gulf of St. Lawrence.

Oribatella (Acari, Oribatida, Oribatellidae) of eastern North America

Zootaxa ◽  
2011 ◽  
Vol 2973 (1) ◽  
pp. 1 ◽  
Author(s):  
VALERIE M. BEHAN-PELLETIER
Keyword(s):  
North America ◽  
Oribatid Mite ◽  
Eastern North America ◽  
Eastern Canada ◽  
New Distribution ◽  
Mite Genus

The oribatid mite genus Oribatella (Oribatellidae) includes 107 species worldwide, with 13 species reported for eastern North America. Herein, I describe six new Oribatella species from eastern North America: O. flagellata sp. nov., O. jacoti sp. nov., O. nortoni sp. nov., O. metzi sp. nov., O. texana sp. nov., and O. transtriata sp. nov. Oribatella metzi and O. nortoni are described on the basis of adults and immatures. The deutonymph and tritonymph of O. metzi lack dorsocentral setae dm and dp, and the diagnosis of the genus is expanded to accommodate these newly described immatures, and also newly described adult characters. I provide expanded, detailed diagnoses for previously described species of eastern North America: Oribatella arctica Thor, 1930, O. brevicornuta Jacot, 1934, O. dentaticuspis Ewing, 1910, O. gigantea Berlese, 1916, O. mediocris Berlese, 1916, O. minuta Banks, 1896, O. plummeri Jacot, 1934, O. pusilla Berlese, 1916, O. quadridentata Banks, 1895, O. reticulata Berlese, 1916, O. reticulatoides Hammer, 1955 and provide new distribution records where available. I question the specific status of O. extensa Jacot, 1934, and consider records of O. sexdentata Berlese, 1916 from eastern North America to be doubtful. Oribatella quadricornuta (Michael, 1880) is confirmed to occur in eastern Canada. Finally, I give a key to adults of the 18 species of Oribatella now known from eastern North America.

Lithocolletis blancardella Fabricius (Lepidoptera: Gracilariidae) on Apple in Eastern North America with Notes on Other Species Occurring on Rosaceae

1964 ◽  
Vol 96 (11) ◽  
pp. 1442-1449 ◽  
Author(s):  
H. T. Stultz
Keyword(s):  
United States ◽  
North America ◽  
Leaf Miner ◽  
Eastern North America ◽  
Similar Species ◽  
Black Cherry ◽  
Northeastern United States ◽  
Maritime Provinces ◽  
Eastern Canada ◽  
Large Numbers

AbstractA spotted tentiform leaf miner, often present during recent years in large numbers in apple orchards in the Maritime Provinces of Canada, is identified as Lithocolletis blancardella Fabr., a species common on apples in Europe. Recent collecting indicates that the species occurs widely in Eastern Canada and the northeastern United States. Diagnostic characters, especially those of the male genitalia, are compared with those of specimens identified as L. crataegella Clem. and L. propinquinella Braun, two similar species which commonly occur on apple and black cherry respectively.

A comparison of Eastern North America and Coastal New England magma suites: implications for subcontinental mantle evolution and the broad-terrane hypothesis

2005 ◽  
Vol 42 (9) ◽  
pp. 1571-1587 ◽  
Author(s):  
Michael J Dorais ◽  
Matthew Harper ◽  
Susan Larson ◽  
Hendro Nugroho ◽  
Paul Richardson ◽  
...  
Keyword(s):  
North America ◽  
New England ◽  
Trace Element ◽  
Crustal Contamination ◽  
Flood Basalt ◽  
Incompatible Trace Element ◽  
Eastern North America ◽  
Mantle Evolution ◽  
Isotopic Compositions ◽  
Maritime Canada

New England and Maritime Canada host two major suites of Mesozoic diabase dykes. The oldest is the Coastal New England dykes that were emplaced between 225 and 230 Ma. These rocks are dominantly alkaline with trace element and isotopic compositions indicative of a high-238U/204Pb mantle (HIMU) source. The oldest of the ~200 Ma Mesozoic rift magmas is represented by the Talcott basalt of the Hartford basin and its feeder dykes. External to the basin is the compositionally equivalent Higganum dyke. The extension of the Higganum, the Onway dyke in New Hampshire, is identical in major and trace element and isotopic compositions indicating that the dyke system represented a feeder to flows of flood basalt proportions. The Talcott system rocks have some trace element similarities with arc basalts and have been interpreted as representing melts of a subduction zone modified mantle beneath the Laurentian- Gondwanan suture. Incompatible trace element ratios and Ba, Th, and U values are, however, unlike arc basalts and are more indicative of crustal contamination of the primary magma. The coastal New England magmas have oceanic island basalt signatures that are generally thought to represent plume-tail magmatism, which is antithetic to a plume-head origin for the younger eastern North America magmas. However, coastal New England rocks have the same trace element signatures as the alkaline rocks of the Loihi seamount, which represent the pre-shield stage to the voluminous tholeiitic magmatism in Hawaii.

scholarly journals Hemithea aestivaria (Hübner) (Lepidoptera: Geometridae), a Palaearctic moth new to eastern North America

2021 ◽  
Author(s):  
Christian Schmidt ◽  
Alexandre Anctil
Keyword(s):  
British Columbia ◽  
North America ◽  
Pacific Northwest ◽  
North American ◽  
Eastern North America ◽  
Urban Centers ◽  
Eastern Canada ◽  
Restricted Area ◽  
The Pacific ◽  
Geometrid Moth

The geometrid moth Hemithea aestivaria (Hübner, 1789) was introduced from Europe to North America, first detected in British Columbia in 1973. Until 2019, its North American range was limited to a restricted area of the Pacific Northwest. Here, we report on the first records of H. aestivaria for eastern North America from three widely separated urban centers in eastern Canada during 2019-2020.

Saddled Prominent Outbreaks in North America

1988 ◽  
Vol 5 (2) ◽  
pp. 88-91 ◽  
Author(s):  
Peter J. Martinat ◽  
Douglas C. Allen
Keyword(s):  
New York ◽  
North America ◽  
New England ◽  
Sugar Maple ◽  
Eastern North America ◽  
American Beech ◽  
White Mountains ◽  
The Third ◽  
Historical Pattern ◽  
Mountain Systems

Abstract Saddled prominent has caused severe defoliation in eastern North America at 10-13 year intervals since 1907. Outbreaks consisted of simultaneous infestations in physiographically separated New England mountain systems: the Taconic, Berkshire, Green, and White Mountains. In more extensive outbreaks, concurrent infestations occurred within a 2-3 year period in New England, New York, Pennsylvania, Ontario, Quebec, the Canadian Maritimes, Michigan, and Wisconsin. However, outbreaks were most frequent and persistent in New England, where defoliation first appeared on ridges or upper slopes, and American beech and sugar maple composed at least 60% of the forest. In subsequent years, defoliation persisted in these epicenters (outbreak foci) and spread to stands at lower elevations. General population collapse usually occurred during the third or fourth summer following initial defoliation. Based solely on the historical pattern of infestations, outbreaks are predictable if at all, in the Green and White Mountains in New England. North. J. Appl. For. 5:88-91, June 1988.

THE HYMENOPTEROUS PARASITES (HYMENOPTERA: APHIDIIDAE ET APHELINIDAE) OF THE PEA APHID IN EASTERN NORTH AMERICA

1967 ◽  
Vol 99 (10) ◽  
pp. 1051-1082 ◽  
Author(s):  
Manfred Mackauer ◽  
Thelma Finlayson
Keyword(s):  
North America ◽  
Acyrthosiphon Pisum ◽  
Larval Instar ◽  
Pea Aphid ◽  
Species Differentiation ◽  
Eastern North America ◽  
Eastern Canada

AbstractThe adults, mummies, and final-instar larvae of the eight hymenopterous parasites of the pea aphid, Acyrthosiphon pisum (Harris), in Eastern Canada are described and illustrated. The history, synonymy, and biology of each species, and the problems of species differentiation in two of the genera, Aphidius and Praon, are discussed. Keys are given to separate the adults, mummies, and cast skins of the last larval instar.

scholarly journals Hemithea aestivaria (Hübner) (Lepidoptera: Geometridae), a Palaearctic moth, new to eastern North America

2021 ◽  
Vol 9 ◽  
Author(s):  
Christian Schmidt ◽  
Alexandre Anctil
Keyword(s):  
British Columbia ◽  
North America ◽  
Pacific Northwest ◽  
North American ◽  
Eastern North America ◽  
Eastern Canada ◽  
Restricted Area ◽  
The Pacific ◽  
Geometrid Moth

The geometrid moth Hemithea aestivaria (Hübner, 1789) was introduced from Europe to North America, first being detected in British Columbia in 1973. Until 2019, its North American range was limited to a restricted area of the Pacific Northwest. Here, we report on the first records of H. aestivaria for eastern North America from three widely separated urban centres in eastern Canada during 2019-2020.

Implications of Revised Seismic Spectra for Eastern North America on Response of Nonstructural Components and Piping

2012 ◽  
Author(s):  
Hesham H. H. Mohammed ◽  
Waleed Mekky
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
North America ◽  
Nuclear Power ◽  
Dynamic Properties ◽  
Eastern North America ◽  
Structural Components ◽  
Uniform Hazard Spectra ◽  
Eastern Canada ◽  
Nonstructural Components

The seismic response and qualification of nuclear power plant related building structures and non-structural components are affected by the sub-systems’ dynamic properties as well as the external excitation level and characteristics; to which these subsystems are subjected in a seismic event. Recently a great interest in the seismic characteristics of Eastern North America has resulted in the revision of the methodology used to develop response spectra for Nuclear Power Plant (NPP) sites including Eastern Canada. Currently site specific Uniform Hazard Spectra (UHS) are developed based on updated data that is specific to the continental East North America region and modified ground motion prediction equations. The revised UHS exhibit higher amplification in the high frequency range as compared to standard spectral shapes traditionally used in CSA/CAN3 289.3 for 1981. This paper presents the numerical results and observations for an investigation aimed at identifying the effect of these revised UHS spectral shape on the response on non structural components including piping typically requiring seismic qualification in NPPs.

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