The Experts below are selected from a list of 33057 Experts worldwide ranked by ideXlab platform
Cheryl Cortemeglia - One of the best experts on this subject based on the ideXlab platform.
-
Field Confirmation of Laboratory-Determined Lower Temperature Tolerance of Transgenic and Wildtype Zebra Danios, Danio rerio
The American Midland Naturalist, 2008Co-Authors: Cheryl Cortemeglia, Thomas L. Beitinger, James H. Kennedy, Tammie WaltersAbstract:ABSTRACT A transgenic variety (red glofish) of the aquarium fish, zebra Danio (Danio rerio) and wildtype zebra Danios were exposed to the natural climate of north Texas in four, outside, 10,000-L microcosms during the winter of 2004–2005. At least 13 of 68 fish survived at temperatures as low as 7.5 C; however, none survived a 4 d exposure to 4 C following a cold front. These field results corroborate laboratory findings that the lowest temperature that these two varieties of D. rerio can survive is about 5 C.
-
Susceptibility of Transgenic and Wildtype Zebra Danios, Danio rerio, to Predation
Environmental Biology of Fishes, 2006Co-Authors: Cheryl Cortemeglia, Thomas L. BeitingerAbstract:The effects to ecosystems by genetically modified organisms are still unknown, yet a transgenic version (the red glofish or red fluorescent protein (RFP) transgenic zebra Danio) of the zebra Danio, Danio rerio, a common aquarium fish, has become the first transgenic pet sold in the USA. It has been hypothesized that RFP zebra Danios will not persist in nature because they will be preferentially preyed upon due to their red coloration; however, the bright coloration of wildtype zebra Danios may indicate they are aposematic since they are not preyed upon immediately by predators in their native range. These hypotheses were addressed via nine predation experiments with largemouth bass, Micropterus salmoides, as predator and combinations of mosquitofish, Gambusia affinis, wildtype zebra Danios, and RFP zebra Danios as prey. Neither wildtype nor RFP transgenic zebra Danios are aposematic since both varieties were readily consumed by largemouth bass in laboratory trials. Both varieties were preyed upon in approximately equal proportion (1.4 to 1.0) so the bright, apparently conspicuous coloration of the transgenic zebra Danios did not increase their susceptibility to predation. In these laboratory trials, largemouth bass did not preferentially prey upon a native fish, the mosquitofish, relative to wildtype zebra Danios (1.2 to 1.0). Based on the results of these experiments, wildtype zebra Danios and RFP transgenic zebra Danios are likely to be preyed upon in a similar fashion as native forage fish.
-
Projected US distributions of transgenic and wildtype zebra Danios, Danio rerio, based on temperature tolerance data
Journal of Thermal Biology, 2006Co-Authors: Cheryl Cortemeglia, Thomas L. BeitingerAbstract:Abstract A genetically modified version of the south Asian, zebra Danio, Danio rerio, a common aquarium fish, has become the first transgenic pet sold in the USA. Mean chronic lethal maxima of wildtype (39.8 °C, n = 16 ) and transgenic (39.3 °C, n = 10 ) zebra Danios initially acclimated to 30 °C were statistically (but not dramatically) different as were mean chronic lethal minima of wildtype (5.3 °C, n = 16 ) and transgenic (5.6 °C, n = 20 ) zebra Danios initially acclimated to 20 °C. These temperature tolerance values were used to estimate potential geographic distributions of the two varieties in the USA. Distributions of these D. rerio varieties in the USA should not be limited by their upper temperature tolerances, and low-temperature tolerance data suggest that both varieties are capable of overwintering in some southern and western US waters.
-
Temperature tolerances and predation susceptibilities of transgenic and wildtype zebra Danios, Danio rerio.
2005Co-Authors: Cheryl CortemegliaAbstract:Both the upper and lower temperature tolerances of red fluorescent protein transgenic zebra Danios and wildtype zebra Danios, Danio rerio, were significantly different via two different methods; however, all differences are small (< 1°C) and probably not ecologically important. The U.S. geographic distributions of both transgenic and wildtype zebra Danios will not be restricted by their upper thermal tolerances, but will be limited to the southern and western portions of the U.S. by their lower thermal tolerances. Largemouth bass did not preferentially prey upon transgenic zebra Danios compared to wildtype Danios or wildtypes relative to a native fish. If transgenic or wildtype zebra Danios are released into southern or western U.S. waters, it is possible they could be eliminated by predation.
-
Temperature Tolerances of Wild-Type and Red Transgenic Zebra Danios
Transactions of the American Fisheries Society, 2005Co-Authors: Cheryl Cortemeglia, Thomas L. BeitingerAbstract:Abstract Seventy-nine transgenic red zebra Danios Danio rerio (also known as zebrafish; transgenics also known as glofish) and 78 wild-type zebra Danios acclimated to 20°C and 30°C had critical thermal maxima (±SD) of 38.8 ± 0.54°C and 41.3 ± 0.50°C (glofish) and 39.2 ± 0.34°C and 41.7 ± 0.35°C (wild-type), respectively. The critical thermal minima (±SD) were 7.2 ± 0.48°C and 10.0 ± 0.50°C (glofish) and 6.2 ± 0.28°C and 10.6 ± 0.53°C (wild-type), respectively. At both 20°C and 30°C acclimation temperatures, critical thermal maxima (CTMax) and critical thermal minima (CTMin) were significantly different between transgenic and wild zebrafish; however, differences were 1°C and less. The temperature tolerances would classify both varieties of zebra Danios as eurythermal and place this species in the relatively rare category of fishes with a CTMax above 40.0°C. Compared with similar temperature tolerance data reported for other tropical fishes that have successfully been introduced into U.S. waters, the presen...
Thomas L. Beitinger - One of the best experts on this subject based on the ideXlab platform.
-
Field Confirmation of Laboratory-Determined Lower Temperature Tolerance of Transgenic and Wildtype Zebra Danios, Danio rerio
The American Midland Naturalist, 2008Co-Authors: Cheryl Cortemeglia, Thomas L. Beitinger, James H. Kennedy, Tammie WaltersAbstract:ABSTRACT A transgenic variety (red glofish) of the aquarium fish, zebra Danio (Danio rerio) and wildtype zebra Danios were exposed to the natural climate of north Texas in four, outside, 10,000-L microcosms during the winter of 2004–2005. At least 13 of 68 fish survived at temperatures as low as 7.5 C; however, none survived a 4 d exposure to 4 C following a cold front. These field results corroborate laboratory findings that the lowest temperature that these two varieties of D. rerio can survive is about 5 C.
-
Susceptibility of Transgenic and Wildtype Zebra Danios, Danio rerio, to Predation
Environmental Biology of Fishes, 2006Co-Authors: Cheryl Cortemeglia, Thomas L. BeitingerAbstract:The effects to ecosystems by genetically modified organisms are still unknown, yet a transgenic version (the red glofish or red fluorescent protein (RFP) transgenic zebra Danio) of the zebra Danio, Danio rerio, a common aquarium fish, has become the first transgenic pet sold in the USA. It has been hypothesized that RFP zebra Danios will not persist in nature because they will be preferentially preyed upon due to their red coloration; however, the bright coloration of wildtype zebra Danios may indicate they are aposematic since they are not preyed upon immediately by predators in their native range. These hypotheses were addressed via nine predation experiments with largemouth bass, Micropterus salmoides, as predator and combinations of mosquitofish, Gambusia affinis, wildtype zebra Danios, and RFP zebra Danios as prey. Neither wildtype nor RFP transgenic zebra Danios are aposematic since both varieties were readily consumed by largemouth bass in laboratory trials. Both varieties were preyed upon in approximately equal proportion (1.4 to 1.0) so the bright, apparently conspicuous coloration of the transgenic zebra Danios did not increase their susceptibility to predation. In these laboratory trials, largemouth bass did not preferentially prey upon a native fish, the mosquitofish, relative to wildtype zebra Danios (1.2 to 1.0). Based on the results of these experiments, wildtype zebra Danios and RFP transgenic zebra Danios are likely to be preyed upon in a similar fashion as native forage fish.
-
Projected US distributions of transgenic and wildtype zebra Danios, Danio rerio, based on temperature tolerance data
Journal of Thermal Biology, 2006Co-Authors: Cheryl Cortemeglia, Thomas L. BeitingerAbstract:Abstract A genetically modified version of the south Asian, zebra Danio, Danio rerio, a common aquarium fish, has become the first transgenic pet sold in the USA. Mean chronic lethal maxima of wildtype (39.8 °C, n = 16 ) and transgenic (39.3 °C, n = 10 ) zebra Danios initially acclimated to 30 °C were statistically (but not dramatically) different as were mean chronic lethal minima of wildtype (5.3 °C, n = 16 ) and transgenic (5.6 °C, n = 20 ) zebra Danios initially acclimated to 20 °C. These temperature tolerance values were used to estimate potential geographic distributions of the two varieties in the USA. Distributions of these D. rerio varieties in the USA should not be limited by their upper temperature tolerances, and low-temperature tolerance data suggest that both varieties are capable of overwintering in some southern and western US waters.
-
Temperature Tolerances of Wild-Type and Red Transgenic Zebra Danios
Transactions of the American Fisheries Society, 2005Co-Authors: Cheryl Cortemeglia, Thomas L. BeitingerAbstract:Abstract Seventy-nine transgenic red zebra Danios Danio rerio (also known as zebrafish; transgenics also known as glofish) and 78 wild-type zebra Danios acclimated to 20°C and 30°C had critical thermal maxima (±SD) of 38.8 ± 0.54°C and 41.3 ± 0.50°C (glofish) and 39.2 ± 0.34°C and 41.7 ± 0.35°C (wild-type), respectively. The critical thermal minima (±SD) were 7.2 ± 0.48°C and 10.0 ± 0.50°C (glofish) and 6.2 ± 0.28°C and 10.6 ± 0.53°C (wild-type), respectively. At both 20°C and 30°C acclimation temperatures, critical thermal maxima (CTMax) and critical thermal minima (CTMin) were significantly different between transgenic and wild zebrafish; however, differences were 1°C and less. The temperature tolerances would classify both varieties of zebra Danios as eurythermal and place this species in the relatively rare category of fishes with a CTMax above 40.0°C. Compared with similar temperature tolerance data reported for other tropical fishes that have successfully been introduced into U.S. waters, the presen...
Fang Fang - One of the best experts on this subject based on the ideXlab platform.
-
Danio aesculapii, a new species of Danio from south-western Myanmar (Teleostei: Cyprinidae)
Zootaxa, 2009Co-Authors: Sven O. Kullander, Fang FangAbstract:Danio aesculapii, new species, is described from small rivers on the western slope of the Rakhine Yoma in south-western Myanmar. It is superficially similar to D. choprae from northern Myanmar in having a series of vertical bars anteriorly on the side, but differs from it and other species of Danio in having six instead of seven or more branched dorsal-fin rays, and from all other species of Danio except D. erythromicron and D. kerri in having 12 instead of 10 or 14 circumpeduncular scale rows.
-
Phylogenetic Analysis of the Asian Cyprinid Genus Danio (Teleostei, Cyprinidae)
Copeia, 2003Co-Authors: Fang FangAbstract:Abstract A phylogenetic analysis of Danio (sensu lato), based on 38 morphological characters, shows that Danio, as recognized until now, is paraphyletic. Danio is restricted to species previously recognized as the “Danio dangila species group,” including D. dangila, Danio rerio, Danio nigrofasciatus, and Danio albolineatus. Those species share an “A stripe” on the anal-fin rays, an anterior lateral extension ventrally on the dentary, two or more pigment stripes on the caudal-fin rays and greatly enlarged lamellar nasal. Esomus is the sister group of Danio. Remaining Danio (sensu lato) species are referred to Devario, characterized by a short and wide premaxillary ascending process with a minute apophysis contacting the kinethmoid, a short maxillary barbel, a “P stripe” extending onto the median caudal-fin rays, and infraorbital 5 not or only slightly reduced. Devario includes the species Devario malabaricus, Devario kakhienensis, Devario devario, Devario chrysotaeniatus, Devario maetaengensis, Devario int...
-
BarredDanio species from the Irrawaddy River drainage (Teleostei, Cyprinidae)
Ichthyological Research, 2000Co-Authors: Fang FangAbstract:The three barred Danio species known from the Irrawaddy River drainage are redescribed. Two species are known from southwestern Yunnan: Danio interruptus in the Husa He and Longchuan, Jian watersheds, and D. apogon abundantly in the main river and tributaries of the Daying Jiang basin. The third species, D. shanensis , occurs in the Myitnge basin of northern Shan State, Myanmar. Danio interruptus differs from other barred Danio species by having a short, incomplete lateral line, a deeper head, and shorter thicker dark vertical bars or blotches anteriorly on the sides. Danio shanensis has the lateral line either complete or incomplete, lesser head depth, and a series of deeper narrower vertical bars. Danio apogon has no lateral line, narrow or indistinct dark vertical bars, and a wide, but indistinct, horizonatal P stripe. Danio choprae , previously considered, as a barred Danio species, is more closely related to the D. dangila species group.
-
A REVIEW OF CHINESE Danio SPECIES (TELEOSTEI:CYPRINIDAE)
2000Co-Authors: Fang FangAbstract:Seven Danio species are found in three major drainages in South and Southwest Yunnan. Danio albolineatus, D. apogon, D. interruptus, and D. kakhienensis are known from the Irrawaddy drainage; D. cf. shanensis and D. browni, from the Salween drainage; and D. chrysotaeniatus is found in the Lancang Jiang of the upper Mekong drainage. Two more Danio species, D. laoensis and a small barred Danio that has not yet been formally described, were found in northern Laos close to the border with China, and might also occur in the Chinese part of the Mekong basin. Danio browni, previously considered to be a junior synonym of D. aequipinnatus, is shown to be valid. A key to all Chinese Danio species and species accounts are also presented.
Sven O. Kullander - One of the best experts on this subject based on the ideXlab platform.
-
Danio annulosus , a new species of chain Danio from the Shuvolong Falls in Bangladesh (Teleostei: Cyprinidae: Danioninae)
Zootaxa, 2015Co-Authors: Sven O. Kullander, Mizanur Rahman, Michael Norén, Abdur Rob MollahAbstract:Danio annulosus, new species, is described from a small pool below the Shuvolong Falls in the Kaptai Lake system in Bangladesh. It shares with chain Danios (D. assamila, D. dangila, D. catenatus, D. concatenatus, and D. sysphigmatus) a colour pattern consisting of series of dark rings with light interspaces along the side, complete lateral line, 14 circumpeduncular scales, a produced first ray in the pectoral fin, and a black humeral spot. It differs from other chain Danios in possessing much shorter pectoral and pelvic fins, and a humeral spot that is slightly wider than deep instead of round or deeper than wide. The mitochondrial cytochrome c oxidase subunit I (COI) sequence separates D. annulosus from the most similar species, D. catenatus by a p-distance of 3.4%. Although recorded from only a single locality, Danio annulosus is expected to have a wider distribution in the Karnafuli River drainage.
-
Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar.
Zootaxa, 2015Co-Authors: Sven O. Kullander, Ralf BritzAbstract:Danio feegradei Hora is redescribed based on recently collected specimens from small coastal streams on the western slope of the Rakhine Yoma, ranging from the Thade River drainage southward to slightly north of Kyeintali. Danio absconditus , new species, is described from the Kyeintali Chaung and small coastal streams near Gwa, south of the range of D. feegradei . Both species are distinguished from other Danio by the presence of a dark, elongate or round spot at the base of the caudal fin and a cleithral marking composed of a small black spot margined by a much smaller orange spot. Danio feegradei is characterized by the colour pattern, with series of white spots along the otherwise dark side; D. absconditus by about 7-–11 dark vertical bars on the abdominal side. Within Danio, the presence of a complete lateral line, cleithral spot, and 14 circumpeduncular scales is shared with D. dangila and similar species, but these character states may be plesiomorphic as suggested by the shared presence of cleithral spot and complete lateral line in Devario and Betadevario . In other Danio the cleithral spot is absent, the lateral line is short or absent, and the circumpeduncular scale count is lower (10–12). Twenty teleost species are reported from streams on the western slope of the Rakhine Yoma, all probably endemic. The parapatric distribution of D. absconditus and D. feegradei is unique within the genus, and may be partly explained by changes in eustatic sea levels.
-
Taxonomy of chain Danio, an Indo-Myanmar species assemblage, with descriptions of four new species (Teleostei: Cyprinidae)
Ichthyological Exploration of Freshwaters, 2015Co-Authors: Sven O. KullanderAbstract:Danio dangila is widely distributed in the Ganga and lower Brahmaputra basins of India, Nepal and Bangladesh and distinguished by the cleithral spot in the shape of a short vertical stripe (vs. a round spot in all similar species). Four new species are described, similar to D. dangila but with round cleithral spot and each diagnosed by species specific colour pattern. Danio assamila, new species, is reported from the upper and middle Brahmaputra drainage in India. Danio catenatus, new species, and D. concatenatus, new species, occur in rivers of the western slope of the Rakhine Yoma, Myanmar. Danio sysphigmatus, new species, occurs in the Sittaung drainage and small coastal drainages in southeastern Myanmar. Those five species, collectively referred to as chain Danios, make up a distinctive group within Danio, diagnosed by elevated number of unbranched dorsal-fin rays, long rostral and maxillary barbels, complete lateral line, presence of a prominent cleithral spot, horizontal stripes modified into series of rings formed by vertical bars between horizontal dark stripes, and pectoral and pelvic fins each with the unbranched first ray prolonged and reaching well beyond the rest of the fin. Danio meghalayensis is resurrected from the synonymy of D. dangila, with D. deyi as a probable junior synonym. Danio meghalayensis has a colour pattern similar to that of chain Danios with vertical bars bridging parallel horizontal stripes but usually predominantly stripes instead of series of rings, a smaller cleithral spot and shorter barbels, and the unbranched ray in the pectoral and pelvic fins is not prolonged. Danio meghalayensis is known only from the Brahmaputra drainage in Meghalaya, India. The geographical distribution of the chain Danios represents a unique pattern for the region, and may be explained by different climate and river drainage systems during the latest glacial period.
-
Danio aesculapii, a new species of Danio from south-western Myanmar (Teleostei: Cyprinidae)
Zootaxa, 2009Co-Authors: Sven O. Kullander, Fang FangAbstract:Danio aesculapii, new species, is described from small rivers on the western slope of the Rakhine Yoma in south-western Myanmar. It is superficially similar to D. choprae from northern Myanmar in having a series of vertical bars anteriorly on the side, but differs from it and other species of Danio in having six instead of seven or more branched dorsal-fin rays, and from all other species of Danio except D. erythromicron and D. kerri in having 12 instead of 10 or 14 circumpeduncular scale rows.
William Rowland - One of the best experts on this subject based on the ideXlab platform.
-
A potential model system for studying the genetics of domestication: behavioral variation among wild and domesticated strains of zebra Danio (Danio rerio)
Canadian Journal of Fisheries and Aquatic Sciences, 2005Co-Authors: Barrie D. Robison, William RowlandAbstract:The process of domestication in fish is fundamentally important to conservation efforts because of the extensive use of hatcheries to mitigate population declines. Research into the genetic changes associated with the domestication process in many endangered species is impeded by a lack of genomic tools, long generation times, and large space requirements. The study of the genetics of fish domestication could therefore benefit from the introduction of a model system. In this paper, we document behavioral and growth rate differences observed between a domesticated laboratory strain of zebra Danio (Danio rerio) and a strain newly introduced into the laboratory from its native habitat in India. Domesticated zebra Danio showed a higher degree of surface orientation, a reduced startle response, and higher growth rate compared with wild zebra Danio. Wilddomesticated interstrain hybrids were intermediate in phenotype for all traits. When strains were reared together, most interstrain behavioral differences were...
