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Articles 22351 - 22380 of 27509
Full-Text Articles in Entire DC Network
Branchiobdellids (Annelida: Clitellata) From Some Eastern North American Caves, With Descriptions Of New Species Of The Genus Cambarincola, Perry C. Holt
International Journal of Speleology
Branchiobdellids are found as epizoites on crustaceans of the orders Isopoda and Decapoda (cambarine crayfishes) in caves of eastern North America. Species that may be considered as troglobites, since they are not known from epigean waters, appear to be confirmed to truly troglobitic isopods and possibly a few troglobitic crayfishes from Florida and the Tennessee-Kentucky Highland Rim cave belt. The majority of the records of branchiobdellids from caves are of representatives of common epigean forms epizootic un crayfishes. Cross-referenced lists of branchiobdellids, their hosts and cave localities are presented. Some of the new species described are apparently troglobitic or troglophilic, …
Feeding Behavior Of The Salamander Gyrinophilus Porphyriticus In Caves, David C. Culver
Feeding Behavior Of The Salamander Gyrinophilus Porphyriticus In Caves, David C. Culver
International Journal of Speleology
The feeding responses of salamander larvae (Gyrinophilus porphyriticus) from caves in the Powell Valley in Virginia were investigated in the laboratory. The larvae locate prey by mechanoreception and capture the prey by a rapid sucking action, much like cave-limited salamanders do. Feeding success is greater with the isopod Asellus recurvatus (about 90 per cent) than with the amphipod Crangonyx antennatus (about 50 per cent), and this largely accounts for the higher frequency of A. recurvatus taken in choice experiments. G. porphyriticus readily ingested the unfamiliar isopod Lirceus usdagalun, but it took four weeks before it was digested …
Temperature Preference Responses Of Some Aquatic, Cave-Adapted Crustaceans From Central Texas And Northeastern México, William R. Elliott, Robert W. Mitchell
Temperature Preference Responses Of Some Aquatic, Cave-Adapted Crustaceans From Central Texas And Northeastern México, William R. Elliott, Robert W. Mitchell
International Journal of Speleology
The temperature preference responses of five species of troglobite crustaceans were studied in a 15°-30°C gradient. Stygonectes hadenoecus, S. russelli and Asellus reddelli had no discernible temperature preferenda. Speocirolana bolivari had a weak preference for 20-30°C. Cirolanides texensis had a pronounced preference for 20-30°C, temperatures much warmer than that of its habitat. The lack of temperature preferenda in three species agrees with the hypothesis that imprisoned troglobites tend to lose responses to those environmental variables which are constant in caves. S. bolivari may retain its temperature selectivity because of a slow rate of cave-adaptation. It is hypothised that C. …
Aspetti Ecologici Ed Evolutivi Del Popolamento Di Grotte Temperate E Tropicali: Osservazioni Sul Ciclo Biologico Di Alcune Specie Di Ptomaphagus (Coleoptera Catopidae), Valerio Sbordoni, Marina Cobolli-Sbordoni
Aspetti Ecologici Ed Evolutivi Del Popolamento Di Grotte Temperate E Tropicali: Osservazioni Sul Ciclo Biologico Di Alcune Specie Di Ptomaphagus (Coleoptera Catopidae), Valerio Sbordoni, Marina Cobolli-Sbordoni
International Journal of Speleology
Differences between tropical and temperate cave communities are an important topic in the actual biospeleological thinking. Among the most striking differences is the paucity of terrestrial troglobites in tropical caves. This fact may depend on the higher energy input into tropical caves which lessens the selection pressures for energy-economizing troglobite adaptations. Consequently evolutionary rates would be slowed in tropical caves and, in a date group, troglobites would appear later in such caves than in temperate ones with lower energy input. In order to investigate this point the authors studied the degree of adaptation to the cave environment in two species …
The Evolution Of The Eastern North American Isopods Of The Genus Asellus (Crustacea: Asellidae) Part Ii, Laurence E. Fleming
The Evolution Of The Eastern North American Isopods Of The Genus Asellus (Crustacea: Asellidae) Part Ii, Laurence E. Fleming
International Journal of Speleology
This paper is the second in the three part series dealing with the evolution of the North American isopods of the genus Asellus. The generic status of Asellus is discussed with emphasis placed on the newly proposed genera of Henry and Magniez (1968). Use is made of comparative anatomical and where feasible statistical methods during this investigation. The first, shorter portion of the study deals with the presentation of evidence supporting the viewpoint that if "Pseudobaicalasellus” is to be considered a valid genus then it must include the members of the Cannulus Group of Steeves (1965). The …
A New Troglobitic Isopod Of The Genus Lirceus (Asellidae) From Southwestern Virginia, With Notes On Its Ecology And Additional Cave Records For The Genus In The Appalachians, John R. Holsinger, Thomas E. Bowman
A New Troglobitic Isopod Of The Genus Lirceus (Asellidae) From Southwestern Virginia, With Notes On Its Ecology And Additional Cave Records For The Genus In The Appalachians, John R. Holsinger, Thomas E. Bowman
International Journal of Speleology
Lirceus usdagalun new species, the first known troglobitic species of the genus, is described from three caves in Lee County, Virginia. The potential taxonomic value of the endopod tip of the male second pleopod, heretofore dismissed as a diagnostic character in this genus, is pointed out. Some general ecological data for the new species are presented, and cave records for other populations of Lirceus spp. from the Appalachians are given.
Fieldbook Of Roderick E. Chandler, December 12, 1972 - June 19, 1973, Roderick Chandler
Fieldbook Of Roderick E. Chandler, December 12, 1972 - June 19, 1973, Roderick Chandler
Audubon Society Okeechobee-Kissimmee and Chandler Warden - Records
Notebook of Roderick E. Chandler containing field notes and contact information.
Predator-Prey Relationships And Reproduction Of The Barn Owl In Southern Texas, Lee C. Otteni, Eric G. Bolen, Clarence Cottam
Predator-Prey Relationships And Reproduction Of The Barn Owl In Southern Texas, Lee C. Otteni, Eric G. Bolen, Clarence Cottam
Wilson Bulletin
No abstract provided.
Nestling Development Of Boat-Billed Herons (Cochlearius Cochlearius) At San Blas, Nayarit, Mexico, Carlos Juarez L., Robert W. Dickerman
Nestling Development Of Boat-Billed Herons (Cochlearius Cochlearius) At San Blas, Nayarit, Mexico, Carlos Juarez L., Robert W. Dickerman
Wilson Bulletin
No abstract provided.
Mill Creek Sanctuary's Colonial History, Dickson J. Preston
Mill Creek Sanctuary's Colonial History, Dickson J. Preston
Maryland Birdlife
No abstract provided.
Ornithological Literature, Wilson Bulletin
Publication Notes And Notices, Wilson Bulletin
Red-Tailed Hawk Populations And Ecology In East-Central Wisconsin, John M. Gates
Red-Tailed Hawk Populations And Ecology In East-Central Wisconsin, John M. Gates
Wilson Bulletin
No abstract provided.
Vernal Testes Development In Tropical-Wintering Dickcissels, John L. Zimmerman, James V. Morrison
Vernal Testes Development In Tropical-Wintering Dickcissels, John L. Zimmerman, James V. Morrison
Wilson Bulletin
No abstract provided.
Third Maryland Record Of Painted Bunting, Richard A. Rowlett
Third Maryland Record Of Painted Bunting, Richard A. Rowlett
Maryland Birdlife
No abstract provided.
The Oracle, November 30, 1972, Grant Donaldson
The Oracle, November 30, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 30, 1972, issue of The Oracle.
The Oracle, November 29, 1972, Grant Donaldson
The Oracle, November 29, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 29, 1972, issue of The Oracle.
The Oracle, November 22, 1972, Grant Donaldson
The Oracle, November 22, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 22, 1972, issue of The Oracle.
The Oracle, November 21, 1972, Grant Donaldson
The Oracle, November 21, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 21, 1972, issue of The Oracle.
Florida Sentinel Bulletin, November 18, 1972, C. Blythe Andrews Jr.
Florida Sentinel Bulletin, November 18, 1972, C. Blythe Andrews Jr.
Florida Sentinel Bulletin Collection
The November 18, 1972, issue of the Florida Sentinel Bulletin.
The Oracle, November 17, 1972, Grant Donaldson
The Oracle, November 17, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 17, 1972, issue of The Oracle.
The Oracle, November 16, 1972, Grant Donaldson
The Oracle, November 16, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 16, 1972, issue of The Oracle.
The Oracle, November 15, 1972, Grant Donaldson
The Oracle, November 15, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 15, 1972, issue of The Oracle.
The Oracle, November 2, 1972, Grant Donaldson
The Oracle, November 2, 1972, Grant Donaldson
The Oracle (Print Editions)
The November 2, 1972, issue of The Oracle.
The Texas Caver, Volume 17. No. 11, November 1972, Mike Moody
The Texas Caver, Volume 17. No. 11, November 1972, Mike Moody
The Texas Caver
Contents: Space Jumars by Jim McLane -- Trip Reports -- Cartoon by Ken Griffin
The Oracle, October 31, 1972, Grant Donaldson
The Oracle, October 31, 1972, Grant Donaldson
The Oracle (Print Editions)
The October 31, 1972, issue of The Oracle.
The Oracle, October 27, 1972, Grant Donaldson
The Oracle, October 27, 1972, Grant Donaldson
The Oracle (Print Editions)
The October 27, 1972, issue of The Oracle.
The Oracle, October 25, 1972, Grant Donaldson
The Oracle, October 25, 1972, Grant Donaldson
The Oracle (Print Editions)
The October 25, 1972, issue of The Oracle.
The Oracle, October 13, 1972, Grant Donaldson
The Oracle, October 13, 1972, Grant Donaldson
The Oracle (Print Editions)
The October 13, 1972, issue of The Oracle.
The Oracle, October 10, 1972, Grant Donaldson
The Oracle, October 10, 1972, Grant Donaldson
The Oracle (Print Editions)
The October 10, 1972, issue of The Oracle.