Reproduction and the origin of polyploids in hybrid salamanders of the genus Ambystoma

1986 ◽  
Vol 28 (4) ◽  
pp. 605-617 ◽  
Author(s):  
James P. Bogart ◽  
Lawrence E. Lichts
Keyword(s):  
North American ◽  
Lake Erie ◽  
Conclusive Evidence ◽  
Critical Examination ◽  
Male Genome ◽  
Eggs And Larvae ◽  
Origin Of Polyploids

Eggs and larvae produced by diploid, triploid, and tetraploid females collected from breeding ponds on Pelee Island in Lake Erie were studied to examine the reproductive mechanism. No instance of parthenogenesis was found as all examined females required sperm to produce viable progeny. Diploid females produced diploid and triploid larvae, triploid females produced triploid and tetraploid larvae, and tetraploid females produced triploid and tetraploid larvae. The majority of the eggs produced by hybrid females do not develop or do not complete embryogenesis. Electrophoretic examination of females and their offspring demonstrate that the male genome is being incorporated in reduced as well as unreduced eggs produced by all three ploidy classes of females. The elevation of ploidy among Pelee Island Ambystoma is attributed to sperm incorporation in unreduced eggs. Triploid as well as tetraploid individuals are constantly being produced. A critical examination of the literature on parthenogenetic or gynogenetic modes of reproduction in North American Ambystoma hybrids shows no conclusive evidence supporting these modes and it is suggested that the reproductive mechanism found among Pelee Island female hybrids may be more generally applied to other hybrid Ambystoma populations.Key words: Ambystoma, polyploids, hybrids, electrophoresis, reproduction.

scholarly journals The grape rootworm, Fidia viticida (Coleoptera: Chrysomelidae), newly recorded from Quebec

2017 ◽  
Vol 97 (1) ◽  
pp. 17-19 ◽  
Author(s):  
Charles Vincent ◽  
Stéphane Dumont ◽  
Pierre de Tonnancour
Keyword(s):  
North American ◽  
Lake Erie ◽  
Vitis Riparia ◽  
Pest Status ◽  
The North ◽  
First Time ◽  
Parthenocissus Quinquefolia

The occurrence of the North American native grape rootworm, Fidia viticida Walsh (Coleoptera: Chrysomelidae), is reported for the first time in Quebec. During the summer of 2016, adults were beaten from Virginia creeper, Parthenocissus quinquefolia, and riverbank grape, Vitis riparia, along the Papineau-Leblanc Highway in Laval, Quebec. Fidia viticida is a pest of cultivated grapes in the Lake Erie area. Its current pest status in Canada is unknown.

Neoechinorhynchus carpiodi n. sp. (Acanthocephala:Neoechinorhynchidae) from quillback of Lake Erie

1968 ◽  
Vol 46 (2) ◽  
pp. 201-204 ◽  
Author(s):  
Alex O. Dechtiar
Keyword(s):  
New Species ◽  
Connective Tissue ◽  
North American ◽  
Lake Erie ◽  
Surrounding Tissue ◽  
Trunk Length ◽  
A New Species

A new species of acanthocephalan, Neoechinorhynchus carpiodi, from Carpiodes cyprinus (LeSueur) is described. It is the eighth species of the genus Neoechinorhynchus reported from North American fishes in which there is marked diversification of the lemnisci. The new species has the longest trunk length of any acanthocephalan previously known from North American fishes. Twenty-five percent of 48 fish were infected with from two to seven parasites per fish. Inflammation of surrounding tissue was observed together with a prominent connective tissue nodule around the penetrating proboscis.

Ligictaluridus Beverley-Burton, 1984 (Monogenea: Ancyrocephalidae) from catfishes (Siluriformes: Ictaluridae) in North America with redescriptions of the type species, Ligictaluridus pricei (Mueller, 1936), and three others

1985 ◽  
Vol 63 (3) ◽  
pp. 715-727 ◽  
Author(s):  
G. J. Klassen ◽  
M. Beverley-Burton
Keyword(s):  
North America ◽  
North American ◽  
New Record ◽  
Type Species ◽  
Lake Erie ◽  
Accessory Piece ◽  
Variable Size ◽  
Cover Slip ◽  
Size And Shape ◽  
Ictalurus Nebulosus

Ligictaluridus Beverley-Burton, 1984 has been proposed for ancyrocephalid monogeneans found on North American catfishes (Siluriformes: Ictaluridae). The genus is characterized by the following: penis curved, sclerotized, tubular; accessory piece with proximally articulating base and distally projecting limb of varying size and shape; dorsal and ventral hamuli with slender, curving shaft, dorsal hamuli smaller than ventral; dorsal and ventral transverse bars bowed with flange projecting medianly; larval hooks of variable size and shape. The type species, Ligictaluridus pricei (Mueller, 1936) Beverley-Burton, 1984, together with L. monticellii (Cognetti de Martiis, 1924) n. comb., L. floridanus (Mueller, 1936) Beverley-Burton, 1984, and L. mirabilis (Mueller, 1937) n. comb., is redescribed. The finding of L. monticellii on Ictalurus nebulosus taken in Lake Erie, Ontario, is a new record for North America. All the above species, as well as L. bychowskyi (Price and Mura, 1969) n. comb., are transferred from Cleidodiscus Mueller, 1934. The effects of variable cover-slip pressure and different preservation techniques on the morphology of some of the sclerotized structures are discussed.

HYDATICUS MODESTUS SHARP VERSUS HYDATICUS STAGNALIS FAB. IN NORTH AMERICA (COLEOPTERA, DYTISCIDAE)

1939 ◽  
Vol 71 (6) ◽  
pp. 126-127 ◽  
Author(s):  
J. B. Wallis
Keyword(s):  
North America ◽  
North American ◽  
North American Species ◽  
Critical Examination ◽  
The North

For many years I have felt reasonably certain that the North American species of Hydaticus identified as stagnalis Fab. was not that species, and I have become entirely convinced on this point since I have had the opportunity of a critical examination of a series of the true stagnalis kindly sent to me by the late Dr. Alois Zimmerman of Munich.

Scanning Electron Microscopy of the Red Pulp of the Spleen

1971 ◽  
Vol 29 ◽  
pp. 496-497
Author(s):  
Masayuki Miyoshi
Keyword(s):  
Electron Microscope ◽  
Ringer Solution ◽  
Conclusive Evidence ◽  
Sinus Wall ◽  
Transmission Electron ◽  
Type 3 ◽  
Cytoplasmic Processes ◽  
Splenic Red Pulp ◽  
Scanning Electron ◽  
Red Pulp

In spite of various attempts, conclusive evidence to explain blood passage in the splenic red pulp does not seem to have been presented. Scanning electron microscope (SEM) observations on the rabbit spleen, originally performed by us, revealed that the sinus was lined by a perforated lattice composed of longitudinally extended rod cells and transverse cytoplasmic processes, and that perforations in the lattice were continuous to the spaces among the stellate reticulum cells of the cord. In the present study the observation was extended to the dog and rat spleens, in which the cord is more developed than in the rabbit in order to clarify the possible differences in the fine structure of the sinus wall. An attempt was also made to examine the development and distribution of macrophage in the blood passage of the red pulp.Spleens were washed and fixed by perfusion with Ringer solution and then with buffered glutaraldehyde. Small tissue cubes were dehydrated with acetone, dried in air and heated with gold. Observations were made by a JEOL SEM Type-3. One air dried tissue cube was cut into small pieces and post fixed with buffered OsO4 for examination under the transmission electron microscope (TEM).

Histochemical and Ultrastructural Studies of the Digestive Epithelium in a Gastropod Gametolytic Organ

1980 ◽  
Vol 38 ◽  
pp. 568-569
Author(s):  
R. L. Reeder ◽  
S. H. Rogers ◽  
W. A. Shannon
Keyword(s):  
Acid Phosphatase ◽  
Genital Tract ◽  
Reproductive Tract ◽  
Ultrastructural Level ◽  
Conclusive Evidence ◽  
Digestive Organ ◽  
Limited Information ◽  
Ultrastructural Studies ◽  
Morphological Studies

Numerous morphological studies have dealt with the spermatheca of pulmonate gastropods. This globular organ, which is attached to the female portion of the reproductive tract by a long duct in these monoecious animals, has had various functions ascribed to it. Recent histochemical demonstrations of deoxyribonuclease, ribonuclease, protease, and acid phosphatase have provided, however, conclusive evidence that it is a digestive organ for the degradation of superfluous sperm and genital tract secretions. Only limited information concerning the spermatheca is available at the ultrastructural level, a fact providing the stimulus for the present study of this organ in Sonorella santaritana, a desert mountain snail from Arizona.

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