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Articles 1 - 30 of 232
Full-Text Articles in Life Sciences
A Decade Of Changes For Virginia Freshwater Aquaculture (1993-2003), Scott H. Newton
A Decade Of Changes For Virginia Freshwater Aquaculture (1993-2003), Scott H. Newton
Virginia Journal of Science
Aquaculture surveys were designed and initiated along with the writing of the State Aquaculture Plan during 1993 to 1995. The first Virginia Aquaculture Survey, conducted for the production year 1993, established the status of both freshwater and marine commercial industries. Subsequent surveys were conducted to trace industry developments relevant to production aspects and economic impacts. Survey data from Virginia Agricultural Statistics Service Reports for 1993, 1995, 1997, and 2003 summarize a decade of Virginia freshwater aquaculture information. Significant changes in sales among the principal aquaculture species occurred over the 10-year period. The 1993 freshwater aquaculture value of $2.8 million increased …
Year-Round Diet Of The Marsh Rice Rat, Oryzomys Palustris, In Virginia Tidal Marshes, Robert K. Rose, Shannon W. Mcgurk
Year-Round Diet Of The Marsh Rice Rat, Oryzomys Palustris, In Virginia Tidal Marshes, Robert K. Rose, Shannon W. Mcgurk
Virginia Journal of Science
The marsh rice rat, Oryzomys palustris, is the dominant semi-aquatic rodent living in tidal marshes of the Virginia coastal plain. Described as highly carnivorous, this species is known to consume a range of animal foods, including crustaceans, mollusks, fish, and arthropods, as well as some plant foods. Analysis of stomach contents from rice rats collected from Eastern Shore tidal marshes throughout an annual cycle revealed that all 103 stomachs contained dicots, 82 percent had monocots, 61 percent had crabs and insects, and 38 percent had snails. Thirty-eight percent of stomachs contained foods in all five categories, no stomach was …
Diapause In Aquatic Invertebrates:What's Known And What's Next In Research And Medical Application?, Victor R. Alekseev, Jiang-Shiou Hwang, Mei-Hui Tseng
Diapause In Aquatic Invertebrates:What's Known And What's Next In Research And Medical Application?, Victor R. Alekseev, Jiang-Shiou Hwang, Mei-Hui Tseng
Journal of Marine Science and Technology
Dormancy is a profound and ancient adaptation found in a wide spectrum of plants and animals of all habitats. In diapause the switch between active and dormant states is driven by hormonal mechanism that usually includes a photoperiodic pace-maker. Temperature, food limitation and some other stress factors as well are shown as driven by diapause induction in aquatic invertebrates. In the last decade, diapause studies from a wide variety of topics have demonstrated that diapause switch mechanisms may be developed to create novel applications in biotechnology. Resting eggs accumulated in the surface lake sediments represent a “bank” of zooplankton species …
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
Status And Distribution Of The Arkansas Darter (Etheostoma Cragini) In Arkansas, Brian K. Wagner, Mark D. Kottmyer
Status And Distribution Of The Arkansas Darter (Etheostoma Cragini) In Arkansas, Brian K. Wagner, Mark D. Kottmyer
Journal of the Arkansas Academy of Science
The Arkansas darter, Etheostoma cragini, has an extremely limited distribution in Arkansas and is designated as a andidate for listing under the Endangered Species Act. It was first discovered in the state in 1979 in Wilson Spring near Fayetteville and has since been found in4 additional headwater streams in Benton and Washington counties prior to this study. A study in 1997 (bund the species in3 of the 5 historic streams, but one stream yielded only a single individual. This study sought to reassess the status of the 5 historically known populations and sample additional spring-run habitats in the Arkansas River …
Distribution Of Arkansas's Bottomland Bats, Rex E. Medlin Jr., Stephen C. Brandebura, H. Bobby Fokidis, Thomas S. Risch
Distribution Of Arkansas's Bottomland Bats, Rex E. Medlin Jr., Stephen C. Brandebura, H. Bobby Fokidis, Thomas S. Risch
Journal of the Arkansas Academy of Science
No abstract provided.
Trained And Consumer Evaluations Of Five Different Beef Muscles With Or Without Ph Enhancement Using Ammonium Hydroxide, Tim Nath
The Journal of Undergraduate Research
Research was conducted in two phases: first to determine optimal pump percentage for each of five pH-enhanced beef muscles and then to determine the effect of pH enhancement on consumer acceptability of beef steaks. Phase I was a 5 x 4 factorial design with five muscles: longissimus lumborum (LL), gluteus medius (GM), triceps brachii (TB), biceps femoris (BF), and psoas major (PM) and four pump percentages: 0, 10, 20, and 30% to determine optimum pump percentage for each muscle using an 8- member trained sensory panel. Phase II was a 5 x 2 factorial design with the same five muscles …
Prey Selection By African Catfish Clarias Gariepinus (Burchell, 1822) Larvae Fed Different Feeding Regimes, Erdal Yilmaz, Ahmet Bozkurt, Kaya Gökçek
Prey Selection By African Catfish Clarias Gariepinus (Burchell, 1822) Larvae Fed Different Feeding Regimes, Erdal Yilmaz, Ahmet Bozkurt, Kaya Gökçek
Turkish Journal of Zoology
Live prey selection by African catfish, Clarias gariepinus, larvae was examined under laboratory conditions. Larvae were offered plankton, plankton + trout starter (TS) and plankton + betaine supplemented trout diet (BTS) for 7 days after exogenous feeding. Five larvae were sampled to determine their gut contents and selectivity index for each treatment 15 min after the feeding. It was observed that dry diets (TS and BTS) improved the growth (P < 0.05), but did not significantly influence the prey selection of the larvae. It was determined that African catfish larvae preferred Copepods and Rotaria sp. to other zooplankton species for all feeding regimes.
Amblyseius Californicus (Mcgregor, 1954) (Acari: Phytoseiidae), A New Record For The Turkish Fauna, İbrahi̇m Çakmak, Sultan Çobanoğlu
Amblyseius Californicus (Mcgregor, 1954) (Acari: Phytoseiidae), A New Record For The Turkish Fauna, İbrahi̇m Çakmak, Sultan Çobanoğlu
Turkish Journal of Zoology
During 2001-2003, Amblyseius californicus (McGregor) was collected from the strawberry, peach, bean and pepper, where it was associated with Tetranychus urticae and Panonychus ulmi in Kuşadası, Aydın, Turkey. The descriptions and drawings of male and female A. californicus, which is a new record for the Turkish fauna, are given.
A Preliminary Study On The Identification Of The Littoral Oligochaete (Annelida) And Chironomidae (Diptera) Fauna Of Lake Kovada, A National Park In Turkey, Nai̇me Arslan, Yalçin Şahi̇n
A Preliminary Study On The Identification Of The Littoral Oligochaete (Annelida) And Chironomidae (Diptera) Fauna Of Lake Kovada, A National Park In Turkey, Nai̇me Arslan, Yalçin Şahi̇n
Turkish Journal of Zoology
Samples were collected from 7 different stations between January 2002 and December 2002 with a view to identifying the littoral benthic fauna (Oligochaeta and Chironomidae) of Lake Kovada, located in Southern Anatolia. As a result of this study, 35 species were determined, comprising 15 species from Oligochaeta (8 Naidid and 7 Tubificid), and 20 species from Chironomidae (4 Tanypodin, 2 Orthocladiin, 12 Chironomini and 2 Tanytarsin). Species richness varied between 11 and 19. The littoral Oligochaete and Chironomidae fauna of Lake Kovada was dominated by the widely distributed Potamothrix hammoniensis, Tubifex tubifex, Limnodrilus hoffmeisteri and Nais communis (Oligochaeta), and Cryptochironomus …
Carapacial Scute Variation In Green Turtle, Chelonia Mydas Hatchlings In Northern Cyprus, Burcu Özdemi̇r, Oğuz Türkozan
Carapacial Scute Variation In Green Turtle, Chelonia Mydas Hatchlings In Northern Cyprus, Burcu Özdemi̇r, Oğuz Türkozan
Turkish Journal of Zoology
The carapacial scutes of 718 green turtle hatchlings, Chelonia mydas (Linnaeus, 1758), from 2 different nesting beaches in Northern Cyprus were examined. Scutes were examined with regard to variation within carapacial scute series and variation in carapacial scute pattern. The vertebral, costal and marginal series were the most variable and the supracaudal scutes were almost stable for the hatchlings. The most common scute pattern observed was 11 pairs of marginals, 4 pairs of costals, 5 vertebrals, 2 supracaudals and a single nuchal. The straight carapace length (SCL) of the hatchlings ranged from 39 to 51 mm with a weight that …
The Effect Of Temperature, Ph, And Salt On Amylase In Heliodiaptomus Viduus (Gurney) (Crustacea: Copepoda: Calanoida), Tapan Kr. Dutta, Malabendu Jana, Piriti R. Pahari, Tanmay Bhattacharya
The Effect Of Temperature, Ph, And Salt On Amylase In Heliodiaptomus Viduus (Gurney) (Crustacea: Copepoda: Calanoida), Tapan Kr. Dutta, Malabendu Jana, Piriti R. Pahari, Tanmay Bhattacharya
Turkish Journal of Zoology
An interesting a-amylase has been obtained in large quantity (2400 U/g of body weight) with specific activity (20.22 U/g protein) from a freshwater zooplankton, Heliodiaptomus viduus (Gurney). Partially purified enzyme showed activity up to 70 ºC and demonstrated optimum activity at 30 ºC. The enzyme was active between pH 3.5 and 8.5, with maximum activity at pH 6.0. It retained its full activity at 30 ºC for 2 h, but became inactive at 60 ºC after 2 h, and at 70 ºC after 1 h. Enzyme activity was retained at 60% in 2 M NaCl after 24 h incubation, while …
Karyological And Some Morphological Characteristics Of Spalax Leucodon Nordmann, 1840 (Mammalia: Rodentia) Superspecies Around Kastamonu Province, Turkey, Mustafa Sözen, Murat Sevi̇ndi̇k, Ferhat Matur
Karyological And Some Morphological Characteristics Of Spalax Leucodon Nordmann, 1840 (Mammalia: Rodentia) Superspecies Around Kastamonu Province, Turkey, Mustafa Sözen, Murat Sevi̇ndi̇k, Ferhat Matur
Turkish Journal of Zoology
The karyotypes and morphology of 98 specimens of the subterranean mole rat Spalax leucodon Nordmann, 1840 across 18 localities in and around Kastamonu province were analysed. It was determined that S. leucodon has 2n = 54, NF = 72; 2n = 56, NF = 74; 2n = 58, NF = 74; 2n =60, NF = 74 in the populations from the Kastamonu region. According to these karyological findings based on chromosome morphology the diploid chromosome numbers of 2n = 56, 2n =58, and 2n = 60 determined here are new for Spalax leucodon in Turkey. Because diploid numbers of these …
Test For Acute Toxicity Of Copper, Cadmium, And Mercury In Five Marine Species, Ermelinda Prato, Francesca Biandolino, Christian Scardicchio
Test For Acute Toxicity Of Copper, Cadmium, And Mercury In Five Marine Species, Ermelinda Prato, Francesca Biandolino, Christian Scardicchio
Turkish Journal of Zoology
: The acute toxicity of copper (Cu), cadmium (Cd), and mercury (Hg) to the marine invertebrates Gammarus aequicauda, Corophium insidiosum, Idotea baltica, Sphaeroma serratum, and Mytilus galloprovincialis were evaluated by static bioassays and calculation of the LC_{50} (lethality concentration for 50%). Hg was more toxic to Gammarus aequicauda, Corophium insidiosum, Idotea baltica, Sphaeroma serratum, and Mytilus galloprovincialis than Cu and Cd. Cu was the least toxic of the metals tested.
New Torrenticola Piersig (Acari: Hydrachnidia: Torrenticolidae) Species For The Turkish Fauna, Vladimir Pesic, Orhan Erman, Yunus Esen
New Torrenticola Piersig (Acari: Hydrachnidia: Torrenticolidae) Species For The Turkish Fauna, Vladimir Pesic, Orhan Erman, Yunus Esen
Turkish Journal of Zoology
In this study, the morphological characteristics, measurements, habitats and distribution of Torrenticola nana Di Sabatino & Gerecke, 2003 and Torrenticola jasminae Bader, 1988, which are new records for the Turkish fauna, are presented.
Distribution Of An Invasive Fish Species, Pseudorasbora Parva (Temminck & Schlegel, 1846) In Turkey, Fi̇tnat Güler Ekmekçi̇, Şeri̇fe Gülsün Kirankaya
Distribution Of An Invasive Fish Species, Pseudorasbora Parva (Temminck & Schlegel, 1846) In Turkey, Fi̇tnat Güler Ekmekçi̇, Şeri̇fe Gülsün Kirankaya
Turkish Journal of Zoology
Pseudorasbora parva is a small cyprinid fish native to East Asia. In 1982, the occurrence of this species was first recorded from the Thrace region of Turkey and in 1996, from Aksu Stream. In this study, specimens collected from various localities in central and west Anatolia, such as the Sakarya River Basin, Kızılırmak River Basin, and Bakırçay River Basin, between 1999 and 2004, were used to show the rapid invasion of P. parva in Turkish freshwater systems. This species is regarded as a pest and the rapid P. parva invasion throughout Anatolia could pose a threat to the diversity of …
New Records And Description Of A New Subspecies For The Water Mite Fauna (Acari, Hydrachnidia) Of Turkey From The Eastern Black Sea Coast, Vladimir Pesic, Davut Turan
New Records And Description Of A New Subspecies For The Water Mite Fauna (Acari, Hydrachnidia) Of Turkey From The Eastern Black Sea Coast, Vladimir Pesic, Davut Turan
Turkish Journal of Zoology
A new subspecies, Mixobates brachypalpis ozkani subsp. nov., is described from a stream in the Rize region (Eastern Black Sea coast, Turkey). The new subspecies can be easily distinguished from the type material of M. brachypalpis, a species reported only from the locus typicus in Russia, by the more elongated and slender I-L-5/6. In addition, 3 water mite species (Torrenticola oraviensis (Láska, 1953), Torrenticola thori (Halbert, 1944) and Mideopsis roztoczensis Biesiadka and Kovalik, 1979) are reported for the first time from Turkey.
Discovery Of A Dicephalic Western Diamondback Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), From Texas, With A Summary Of Dicephalism Among Members Of The Genus Crotalus, Chris T. Mcallister, Van Wallach
Discovery Of A Dicephalic Western Diamondback Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), From Texas, With A Summary Of Dicephalism Among Members Of The Genus Crotalus, Chris T. Mcallister, Van Wallach
Journal of the Arkansas Academy of Science
We document the fourth record of a dicephalic western diamondback rattlesnake, Crotalus atrox, collected on 17 September 2005 in Tom Green County, Texas, along with features of its external and internal anatomy, which are compared with normal C. atrox neonates. This is only the second reported case of complete anatomical duplication of the respiratory system and nearly complete duplication of the circulatory and digestive systems in dicephalic snakes. In addition, we present a summary of dicephalism among 10 species within the genus Crotalus.
Status Survey Of The Peppered Shiner, Notropis Perpallidus Hubbs And Black, In Arkansas And Oklahoma, Henry W. Robison
Status Survey Of The Peppered Shiner, Notropis Perpallidus Hubbs And Black, In Arkansas And Oklahoma, Henry W. Robison
Journal of the Arkansas Academy of Science
The peppered shiner, Notropis perpallidus Hubbs and Black, is a small, silvery, upland stream fish found only in southwestern Arkansas and eastern Oklahoma. This fish species was studied from 1999-2001 to determine its distribution, habitat, and conservation status. A total of81 collections was made during the 2-year study; however, only 17 specimens were collected. The present distribution of the peppered shiner in Arkansas and Oklahoma is described as well as the conservation status of this cyprinid in both states.
Hyperinfection With The Bass Tapeworm, Proteocephalus Ambloplites (Cestoda), In The Black Basses Micropterus Punctulatus And M. Dolomieui From Certain Arkansas Reservoir Lakes, James J. Daly Sr., Randal J. Keller, Bruce Deyoung
Hyperinfection With The Bass Tapeworm, Proteocephalus Ambloplites (Cestoda), In The Black Basses Micropterus Punctulatus And M. Dolomieui From Certain Arkansas Reservoir Lakes, James J. Daly Sr., Randal J. Keller, Bruce Deyoung
Journal of the Arkansas Academy of Science
No abstract provided.
New Evidence For A Maternity Colony Of The Indiana Bat (Myotis Sodalis) In The Delta Of Arkansas, Stephen C. Brandebura, Rex E. Medlin Jr., Thomas S. Risch
New Evidence For A Maternity Colony Of The Indiana Bat (Myotis Sodalis) In The Delta Of Arkansas, Stephen C. Brandebura, Rex E. Medlin Jr., Thomas S. Risch
Journal of the Arkansas Academy of Science
No abstract provided.
Aquatic Macroinvertebrates Of The Strawberry River System In North-Central Arkansas, George L. Harp, Henry W. Robison
Aquatic Macroinvertebrates Of The Strawberry River System In North-Central Arkansas, George L. Harp, Henry W. Robison
Journal of the Arkansas Academy of Science
The Strav/berry River has been designated an Extraordinary Resource Water, an Ecologically Sensitive Water Body, and a Natural and Scenic Waterway. As such, it is particularly important that the biodiversity of this river system be documented thoroughly. The purpose of this research was to develop a comprehensive list of the aquatic macroinvertebrates of the Strawberry River and its major tributaries. The information was developed from a thorough literature review and by examining specimens housed in various collections of the Arkansas State University Museum of Zoology and collections of the authors. The latter included 9 collections at 4 sites along the …
Leeches (Annelida: Hirudinida) Of Northern Arkansas, William E. Moser, Donald J. Klemm, Dennis J. Richardson, Benjamin A. Wheeler, Stanley E. Trauth, Bruce A. Daniels
Leeches (Annelida: Hirudinida) Of Northern Arkansas, William E. Moser, Donald J. Klemm, Dennis J. Richardson, Benjamin A. Wheeler, Stanley E. Trauth, Bruce A. Daniels
Journal of the Arkansas Academy of Science
Twenty-one lotic and lentic environments throughout central and northern Arkansas were surveyed for the presence of leeches during June 2004 and April, July - October 2005. Fourteen species of leeches {Helobdella elongata, Helobdella papillata, Helobdella stagnalis, Placobdella cryptobranchii, Placobdella multilineata, Placobdella ornata, Placobdella papillifera, Placobdella parasitica, Placobdella phaler a, Placobdella picta, Haemopis marmorata, Erpobdella fervida, Erpobdella microstoma, and Erpobdella punctata) representing 3 families were collected. Five species (H. elongata, P. cryptobranchii, P. multilineata, H. marmorata, and E. fervida) are reported from Arkansas for the first time. The natural history of the 22 species of leeches now known from Arkansas is …
Geographic Distribution And Harvest Dynamics Of The Eastern Spotted Skunk In Arkansas, D. Blake Sasse, Matthew E. Gompper
Geographic Distribution And Harvest Dynamics Of The Eastern Spotted Skunk In Arkansas, D. Blake Sasse, Matthew E. Gompper
Journal of the Arkansas Academy of Science
The eastern spotted skunk (Spilogale putorius) is a small carnivore found across much of the central and southeastern United States, and while once common, this species has become rare in most obits range. We used harvest records collected by the Arkansas Game and Fish Commission from 1941-2004 to examine historic and current distribution and long-term harvest dynamics of this species in Arkansas. Eastern spotted skunks have historically been most common in the Ozarks and the Ouachitas though the species appears to have been present, but uncommon, in the Gulf Coastal Plain and in some counties in southeastern Arkansas near the …
Unusual Prey Item Found In An Eastern Bluebird Nest, Sarah De Viney Baxter, Richard J. Baxter, Thomas S. Risch
Unusual Prey Item Found In An Eastern Bluebird Nest, Sarah De Viney Baxter, Richard J. Baxter, Thomas S. Risch
Journal of the Arkansas Academy of Science
No abstract provided.
Ichthyofaunal Assemblages In Three Approximate But Ecologically Diverse Streams In Clark County, Arkansas, C. Renn Tumlison, Scott Jordan, Lesley Self, Henry W. Robison
Ichthyofaunal Assemblages In Three Approximate But Ecologically Diverse Streams In Clark County, Arkansas, C. Renn Tumlison, Scott Jordan, Lesley Self, Henry W. Robison
Journal of the Arkansas Academy of Science
Three tributaries to the Ouachita River in eastern Clark County, Arkansas, empty into the river within a collective distance of about 9 km. The streams drain basins derived from the Wilcox formation, partially overlain by terrace and alluvial deposits. Despite their proximity, the streams are very different: L'Eau Frais has a gravel substrate and was recognized by the French as a cool water stream, Tupelo Creek is a bottomland stream from which numerous Water Tupelo (Nyssa aquatica) emerge, and Saline Bayou was named due to its marked salinity. We studied the assemblages of fishes in these 3 very different drainages …
New Distributional Records Of Lampreys From Arkansas, Henry W. Robison, C. Renn Tumlison, James C. Petersen
New Distributional Records Of Lampreys From Arkansas, Henry W. Robison, C. Renn Tumlison, James C. Petersen
Journal of the Arkansas Academy of Science
No abstract provided.
Documentation Of The First Known Occurrence Of The Broad-Billed Hummingbird (Cynanthus Latirostris) In Arkansas, Robert H. Doster, Dan Scheiman, E. Pershing Floyd, Kenny Nichols, Ladonna Nichols
Documentation Of The First Known Occurrence Of The Broad-Billed Hummingbird (Cynanthus Latirostris) In Arkansas, Robert H. Doster, Dan Scheiman, E. Pershing Floyd, Kenny Nichols, Ladonna Nichols
Journal of the Arkansas Academy of Science
No abstract provided.
Noteworthy Geographic Distribution Records For The Golden Topminnow, Fundulus Chrysotus (Cyprinodontiformes: Fundulidae), From Arkansas, Chris T. Mcallister, Henry W. Robison, Thomas M. Buchanan
Noteworthy Geographic Distribution Records For The Golden Topminnow, Fundulus Chrysotus (Cyprinodontiformes: Fundulidae), From Arkansas, Chris T. Mcallister, Henry W. Robison, Thomas M. Buchanan
Journal of the Arkansas Academy of Science
No abstract provided.
Cajun Dwarf Crawfish (Cambrellus Shufeldtii): An Intermediate Host For Southwellina Dimorpha (Acanthocephala), Dennis J. Richardson, William F. Font
Cajun Dwarf Crawfish (Cambrellus Shufeldtii): An Intermediate Host For Southwellina Dimorpha (Acanthocephala), Dennis J. Richardson, William F. Font
Journal of the Arkansas Academy of Science
No abstract provided.