Artificial Hybrids Between Amur Pike, Esox reicherti, and North American Esocids

1977 ◽  
Vol 34 (12) ◽  
pp. 2338-2343 ◽  
Author(s):  
E. J. Crossman ◽  
James W. Meade
Keyword(s):  
North America ◽  
Key Words ◽  
North American ◽  
Inverse Relationship ◽  
Maximum Size ◽  
Parent Species ◽  
Esox Masquinongy ◽  
The Family ◽  
The Difference ◽  
Potential Maximum

Artificial hybrids between Esox reicherti, the only species in the family Esocidae that does not occur naturally in North America, and North American esocids were developed. Five of a possible 10 crosses are described in detail. Three crosses failed (those involving the males of E. niger and E. americanus) for reasons other than methodology, the cross involving females of E. americanus americanus was not made, and a fifth cross involving the male of E. masquinongy was successful but no data are included. Interspecies fertility was suprisingly high, and an inverse relationship existed between survival of crosses and the difference in potential maximum size of parent species. At least one cross was fertile, and an F2 generation and backcrosses were developed. Key words: artificial hybrids. Esocidae, Esox reicherti, Esox masquinongy, Esox lucius, Esox niger, Esox americanus

scholarly journals The Fourth International Symposium on Ranaviruses: Summary of North American Herpetological Content and Points of Interest

2020 ◽  
pp. 29
Author(s):  
Lauren Ash ◽  
Rachel Marschang ◽  
Jolianne Rijks ◽  
Amanda Duffus
Keyword(s):  
North America ◽  
International Symposium ◽  
North American ◽  
Fourth International Symposium ◽  
Dna Viruses ◽  
The North ◽  
Double Stranded Dna ◽  
Points Of Interest ◽  
The Family ◽  
Globally Distributed

Ranaviruses are large double stranded DNA viruses from the family Iridoviridae. They are globally distributed and are currently known to affect fish, reptiles and amphibians. In North America, ranaviruses are also widely distributed, and cause frequent morbidity and mortality events in both wild and cultured populations. This is a synopsys of the North American content of the 4th International Symposium on Ranaviruses held in May 2017 in Budapest, Hungary.

A New Gunnel, Pholis clemensi, from the Coast of Western North America

1964 ◽  
Vol 21 (5) ◽  
pp. 933-939 ◽  
Author(s):  
Richard H. Rosenblatt
Keyword(s):  
British Columbia ◽  
New Species ◽  
North America ◽  
North American ◽  
North American Species ◽  
Western North America ◽  
The North ◽  
The Family ◽  
Juan De Fuca ◽  
A New Species

A new species, Pholis clemensi, referred to the family Pholidae, is named and described from 12 specimens taken in southern British Columbia waters and the Strait of Juan de Fuca. Pholis clemensi is compared with other members of the genus, and a key is given to the North American species.

Pollen morphology and taxonomy in North American Labiatae

1992 ◽  
Vol 70 (5) ◽  
pp. 975-995 ◽  
Author(s):  
Marie Claude G. Trudel ◽  
J. K. Morton
Keyword(s):  
North America ◽  
Key Words ◽  
North American ◽  
Pollen Morphology ◽  
Taxonomic Character ◽  
The North ◽  
Primary Basis ◽  
Sem Studies

Pollen morphology is described and illustrated based on SEM studies of 118 species of Labiatae (Lamiaceae) native to North America. These include representatives of all the 36 native genera. Pollen in this family is subspheroidal and either tricolpate (subfamily Lamioideae) or hexacolpate (subfamily Nepetoideae). In most of the genera and species, the tectum is conspicuously perforated with or without a supratectal reticulum. A key to facilitate identification of the pollen of the North American Labiatae is provided. The value of pollen as a taxonomic character in this family is discussed. Pollen provides the primary basis for recognition of subfamilies in the Labiatae, but at the tribal level only the Ajugeae has distinctive pollen. Several genera, notably Collinsonia, Salvia, Teucrium, and Trichostema, have pollen that is very different from other genera in this study. At the infrageneric level pollen provides valuable taxonomic characters in several genera, notably Hyptis, Monardella, Salvia, Stachys, Teucrium, and Trichostema. Key words: Labiatae, Lamiaceae, pollen, SEM, North America.

scholarly journals New data on the winged fruits of Carpolithus prangosoides Berry from the Eocene of western Tennessee and Kentucky.

2020 ◽  
pp. 199-206
Author(s):  
Steven R. Manchester ◽  
Rachel G. Reback
Keyword(s):  
North America ◽  
North American ◽  
Wing Morphology ◽  
The Family ◽  
Modern Genus ◽  
Reticulate Venation

We reexamined the morphology of the winged fruits Carpolithus prangosoides Berry (later synonym: Terminalia vera Berry) from the Eocene Claiborne Formation of southeastern North America, based on original and more recently collected specimens from several localities in Tennessee and Kentucky, USA. Physical and virtual sections of the fossils allow for more detailed documentation of wing morphology. The fruits are ellipsoidal, with five main lateral wings which bear radiating reticulate venation that forms loops near the margin. None of the fruits show pedicel or style remnants, but a basal pedicel scar was observed at the end opposite to the prominent, persistent sepals, indicating that the perianth was epigynous. A comparison with all known families having fin-winged fruits was conducted to assess possible affinities of C. prangosoides. Although no modern genus was found to match these fossils, the available characters, including the five sepals, suggest that it belongs to the Eudicot clade, likely in the Pentapetalae. However, the prior suggestion of combretaceous affinity is rejected based on differences in wing number and venation. We reviewed other North American reports of combretaceous fossils, concluding that only a few of them are reliable records for the family.

scholarly journals Philosophy of Education in North America: Where has it been? Where is it going?

2008 ◽  
Vol 8 ◽  
Author(s):  
James Scott Johnston
Keyword(s):  
North America ◽  
Key Words ◽  
North American ◽  
Philosophy Of Education ◽  
Educational Practice ◽  
The North ◽  
Educational Theories

This paper examines the question of philosophy of education’s direction through an examination of its historical self-understandings. The North American, and particularly, U.S. context is highlighted. The thesis is that philosophy of education must reconstruct itself through attention to its past self-understandings, but most importantly, through acceptance of projects, issues, and topics that are relevant to it, and not simply to philosophy or educational practice. Some consequences of this thesis are presented at the end of the paper. Key words: philosophy of education; Dewey's influence; educational theories; historical self-understanding; pragmatism

Biogeographic relationships between the macrofungi of temperate eastern Asia and eastern North America

1997 ◽  
Vol 75 (12) ◽  
pp. 2108-2116 ◽  
Author(s):  
Qiuxin Wu ◽  
Gregory M. Mueller
Keyword(s):  
North America ◽  
Key Words ◽  
North American ◽  
Field Work ◽  
Disjunct Distribution ◽  
Eastern North America ◽  
Western North America ◽  
Eastern Asia ◽  
Key Words Biogeography

Eastern North America and temperate eastern Asia reportedly share a relatively high number of taxa of macrofungi (mushrooms and relatives), including a number of taxa that have putative eastern North America – temperate eastern Asia disjunct distributions. These reports have been used to imply an affinity between the mycota (fungal equivalent of flora and fauna) of the two regions. To date, however, this affinity has not been examined in detail. A comparison of north temperate macrofungal mycotas was undertaken to examine the similarity between these regions. We used two methods in this study: (i) direct comparison of taxon lists and (ii) calculation of the Simpson Coefficient of similarity from lists of selected taxa. These analyses were based on field work, herbarium records, and published taxonomic treatments for Amanita, Lactarius, Ramaria, and Boletaceae. Results of these analyses document that taxonomic similarity between eastern North America and temperate eastern Asia mycotas can be quite high. In all cases, the calculated similarity values for eastern North America – temperate eastern Asia comparisons are higher than those between either region of North America and Europe or between western North America and eastern Asia. Furthermore, the eastern North American and temperate eastern Asian disjunct distributions of macrofungi are usually limited to the level of species or lower. Key words: biogeography, China, disjunct distribution, macrofungi, North America, Simpson Coefficient.

The North American Species of the Family Opomyzidae (Diptera: Acalypterae)

1961 ◽  
Vol 93 (7) ◽  
pp. 503-522 ◽  
Author(s):  
J. R. Vockeroth
Keyword(s):  
North America ◽  
North American ◽  
Economic Importance ◽  
North American Species ◽  
The North ◽  
The Family

The family Opomyzidae is composed of small (2.0 mm.-4.4 mm.), slender, usually brown or reddish flies; the wings have at least an apical spot and are usually more heavily marked. Several species of the genus Geomyza have the wings reduced and are nearly flightless. The few species whose larvae are known feed in grass stems. Some are of minor economic importance in Europe but none have been so reported in North America.

scholarly journals THE NORTH AMERICAN SPECIES OF NEMISTRINIDÆ

1883 ◽  
Vol 15 (4) ◽  
pp. 69-72 ◽  
Author(s):  
S. W. Williston
Keyword(s):  
North America ◽  
South America ◽  
North American ◽  
North American Species ◽  
Southern Europe ◽  
The North ◽  
The Family ◽  
The World ◽  
General Appearance

The family of Nemistrinidæ comprises throughout the world one hundred and ten described species, six or seven of which are from Southern Europe and three from North America; the remainder nearly equally distributed in Asia, Africa, Australia and South America. In their habits, so far as known, the species approach the Bombylidæ most closely, as also do many in their general appearance. Structurally they are of interest to the Dipterologist, on account of their intricate and diverse neuration, which in some species is almost Neuropter-like in the reticulation.Doubtless the number of our species will be augmented by future discoveries, but yet we can never expect a very material increase.

scholarly journals CB vs CVB – what is the difference between the tasks and roles of European and North American convention bureaux?

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Natalia Latuszek
Keyword(s):  
North America ◽  
North American ◽  
Design Methodology ◽  
Small Sample ◽  
Content Type ◽  
European Institutions ◽  
Annual Budget ◽  
The Difference ◽  
And Performance ◽  
Time Of Operation

Purpose The purpose of this paper is to analyse the divergence between the tasks and roles of convention bureaux (CB) in North America and Europe. Design/methodology/approach A survey among 55 CB’ managers was conducted. A total of 75% of respondents represented institutions operating in European cities, 25% – in North American ones. This research mainly focused on managers’ opinions about the importance of tasks and roles performed by CB and the degree to which the institutions manage to fulfil them. Therefore, importance-performance analysis was used in the study. Findings CB in North America and Europe broadly differ as to the characteristics of both groups of institutions. They include their time of operation, number of employees, annual budget and types of events that CB try to attract to the cities that they represent. There are no such differences when it comes to the importance and performance of institutions’ tasks and roles. The way in which managers evaluate them is quite similar because the respondents pay the closest attention to the roles of a marketer and an agent of a city played by a convention bureau. Differences lie in the meaning assigned by managers to the particular tasks of surveyed institutions. Originality/value The survey was carried out on a relatively small sample dominated by European institutions. However, the study attempts at investigating the roles and tasks of CB, with only few previous studies on this topic, including the ones comparing CB’ activity in different countries or on different continents. Moreover, proposed recommendations might be useful for a large group of managers and do not have to be limited only to institutions from Europe and North America.

NEOECHINORHYNCHUS NOTEMIGONI N. SP. (ACANTHOCEPHALA: NEOECHINORHYNCHIDAE) FROM GOLDEN SHINER OF LAKE ONTARIO

1967 ◽  
Vol 45 (2) ◽  
pp. 155-159 ◽  
Author(s):  
Alex Dechtiar
Keyword(s):  
New Species ◽  
North America ◽  
North American ◽  
Lake Ontario ◽  
The Family ◽  
Golden Shiner ◽  
Notemigonus Crysoleucas ◽  
A New Species

A new species of acanthocephalan, Neoechinorhynchus notemigoni, from the intestine of Notemigonus crysoleucas (Mitchill) is described. This is the 23rd species of the family Neoechinorhynchidae Van Cleave, 1919 and the 15th species of the genus Neoechinorkynchus Hamann, 1892, known from North American fish according to various authors. It is the sixth species of the genus Neoechinorhynchus which does not utilize catostomids as definitive hosts in North America.

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