Jay Stauffer | Penn State University (original) (raw)

Papers by Jay Stauffer

Research paper thumbnail of Iodotropheus sprengerae Oliver & Loiselle, 1972 (Osteichthyes, Perciformes): proposed replacement of holotype by a neotype

The Bulletin of zoological nomenclature, 1995

Research paper thumbnail of Description of a New Species in the Pseudotropheus williamsi Complex (Teleostei: Cichlidae), from Lake Malawi, Africa

Research paper thumbnail of Molecular genetic identification tools for the unionids of French Creek, Pennsylvania

Research paper thumbnail of Use of indigenous fishes to control schistosome snail vectors in Malaŵi, Africa

Biological Control, Dec 1, 1991

Research paper thumbnail of Three New Sand-Dwelling Cichlids from Lake Malaŵi, Africa, with a Discussion of the Status of the Genus Copadichromis (Teleostei: Cichlidae)

Copeia, Dec 28, 1993

... JAY R. STAUFFER, JR., THOMAS J. LOVULLO, AND KENNETH R. MCKAYE ... Lateral scales cten-oid; h... more ... JAY R. STAUFFER, JR., THOMAS J. LOVULLO, AND KENNETH R. MCKAYE ... Lateral scales cten-oid; holotype with 34 pored lateral-line scales, paratypes with 33-34; pored scales posterior to hypural plate 1-2 (Table 1). Holotype with three scale rows on cheek, paratypes with ...

Research paper thumbnail of Dietary Variability of the Rainbow Darter (Etheostoma caeruleum) in Northwestern Pennsylvania

Northeastern Naturalist, Apr 28, 2020

Research paper thumbnail of Description of a new species of Petrotilapia (Teleostei: Cichlidae), from Lake Malaŵi, Africa

Proceedings of the Biological Society of Washington, Dec 22, 2006

... Juveniles are bright yellow. The new species is sympatric with P. genalutea and P. tridentige... more ... Juveniles are bright yellow. The new species is sympatric with P. genalutea and P. tridentiger, but underwater observations show preferences for different habitats and assortative mating among these sympatric species. Edward O. Murdy, Associate Editor. ...

Research paper thumbnail of Prey handling in Trematocranus placodon, a snail-eating cichlid fish from Malawi

Ichthyological Exploration of Freshwaters, Jun 7, 1991

Research paper thumbnail of Neutral Genetic and Phenotypic Variation within and among Isolated Headwater Populations of Brook Trout

Transactions of The American Fisheries Society, Nov 7, 2018

Research paper thumbnail of Critical Thermal Maxima in Populations of Ambystoma macrodactylum from Different Elevations

Journal of Herpetology, Dec 1, 1983

Research paper thumbnail of Influence of starvation on the preferred temperature of Oreochromis mossambicus (PETERS)

Archiv für Hydrobiologie

Oreochromis mossambicus from a single brood were split into two groups after being free swimming ... more Oreochromis mossambicus from a single brood were split into two groups after being free swimming for 31 days. One group was fed throughout the experiment and one group was starved. Temperature preference trials were conducted on each group. Starved fish ...

Research paper thumbnail of Temperature preference and tolerance of the spotted tilapia and Rio Grande cichlid

Research paper thumbnail of Temperature preference of the redbelly tilapia, Oreochromis zilli (GERVAIS)

Research paper thumbnail of Documentation of Freshwater Mussels (Unionidae) in the Diet of Round Gobies (Neogobius melanostomus) within the French Creek Watershed, Pennsylvania

The American Midland Naturalist, 2019

Abstract. The round goby (Neogobius melanostomus) was discovered in 2013 in the French Creek (All... more Abstract. The round goby (Neogobius melanostomus) was discovered in 2013 in the French Creek (Allegheny River Drainage) watershed and is the first documented invasion outside of the Lake Erie basin in Pennsylvania. The round goby throughout the Laurentian Great Lakes is known to eat dressenid mussels (Dreissenidae), but consumption of either dressenids or native mussels (Unionidae) in tributaries to Lake Erie is minimal based on low populations of any bivalves. The French Creek watershed, on the other hand, harbors 29 species of native freshwater mussels as well as introduced fingernail clams (Sphaeriidae; Corbicula fluminea). The objectives of this study were to document the diet of round gobies in the French Creek watershed to determine whether consumption of native freshwater mussels was occurring. Round gobies were collected in the summer months (May–Sept.) of 2016 via kick seine in four locations, dissected, and their stomach contents identified to lowest possible taxa. We separated the gobies into categories based on length classes, in order to determine if diet changed with increased size and age. Unionid mussels were consumed by all length classes, particularly in length class one (30–44 mm), but diet shifted to a dominance of sphaeriids in length class four (≥75 mm). Round gobies also consumed benthic aquatic insects, a large percentage of which were chironomids (greater than 24% in all size classes). This is the first documentation of unionid consumption by the round goby in Pennsylvania that poses possible threats to native mussels in the French Creek watershed.

Research paper thumbnail of Expanded Distributions of Three Etheostoma Darters (Subgenus Nothonotus) within the Upper Ohio River Watershed

Northeastern Naturalist, 2017

Abstract Within the upper Ohio River watershed, 3 Etheostoma darter species in the subgenus Notho... more Abstract Within the upper Ohio River watershed, 3 Etheostoma darter species in the subgenus Nothonotus have been documented in disjunct populations and were listed as threatened or endangered in Ohio and Pennsylvania. Tailwater habitat below navigation lock and dam (L/D) installations has been shown to contain diverse darter assemblages. Etheostoma camurum (Bluebreast Darter), E. maculatum (Spotted Darter), and E. tippecanoe (Tippecanoe Darter) often live in similar habitats; thus, we hypothesized that all 3 were occupying tailwater habitat below navigational L/Ds. Electrified benthic trawling verified Bluebreast Darter and Tippecanoe Darter below 8 L/D installations and at water depths varying from 1.4 m to 4.5 m and 1.4 m to 5.9 m, respectively. Spotted Darter was only found below 1 L/D. In the Ohio River, benthic trawling documented Bluebreast Darter and Tippecanoe Darter utilizing habitat located within deposition zones and areas above and below islands. Analysis of contemporary and historic distribution data shows that Bluebreast Darter and Tippecanoe Darter now span large sections of the river, but the range of Spotted Darter is more limited and warrants close monitoring. Our study confirms the effectiveness of utilizing benthic trawling in non-wadeable rivers to survey for benthic species such as river-inhabiting darters.

Research paper thumbnail of Status of Exotic Round Goby and Tubenose Goby in Pennsylvania

Northeastern Naturalist, 2016

Research paper thumbnail of Temperature Preference of Banded Killifish, Fundulus diaphanus, from Southwestern Pennsylvania

Research paper thumbnail of An Intergeneric Cyprinid Hybrid, Nocomis platyrhynchus × Notropis chrysocephalus, from the Greenbrier River Drainage in West Virginia

Research paper thumbnail of Hybridization between Etheostoma zonale and Etheostoma olmstedi (Teleostei: Percidae), Following an Introduction Event

Research paper thumbnail of Temperature Preference and Avoidance Responses of the Crayfish, Orconectes obscurus, and Associated Statistical Problems

Canadian Journal of Fisheries and Aquatic Sciences, 1982

Acute temperature selection and avoidance responses of the crayfish, Orconectes obscurus, acclima... more Acute temperature selection and avoidance responses of the crayfish, Orconectes obscurus, acclimated at field collection temperatures of 1.5–26.0 °C and determined in a spatial thermal gradient, were similar to those noted for fishes. Acclimation temperature was positively correlated with the acute preferred and avoided temperatures; both were several degrees higher than the acclimation temperature. A large proportion of the total variance in these data was unexplained. Most variable responses occurred at low acclimation temperatures. The estimated final preferred temperature ranged from 29.8 to 33.9 °C depending upon the method of calculation. Methods of estimating final preferenda from acute tests are considered arbitrary due to statistical problems and the associated high variability. Statistical problems were also noted in the determination of avoidance temperatures of crayfish due to nonindependence of observations on the same organism. No differences were noted (P < 0.05) b...

Research paper thumbnail of Iodotropheus sprengerae Oliver & Loiselle, 1972 (Osteichthyes, Perciformes): proposed replacement of holotype by a neotype

The Bulletin of zoological nomenclature, 1995

Research paper thumbnail of Description of a New Species in the Pseudotropheus williamsi Complex (Teleostei: Cichlidae), from Lake Malawi, Africa

Research paper thumbnail of Molecular genetic identification tools for the unionids of French Creek, Pennsylvania

Research paper thumbnail of Use of indigenous fishes to control schistosome snail vectors in Malaŵi, Africa

Biological Control, Dec 1, 1991

Research paper thumbnail of Three New Sand-Dwelling Cichlids from Lake Malaŵi, Africa, with a Discussion of the Status of the Genus Copadichromis (Teleostei: Cichlidae)

Copeia, Dec 28, 1993

... JAY R. STAUFFER, JR., THOMAS J. LOVULLO, AND KENNETH R. MCKAYE ... Lateral scales cten-oid; h... more ... JAY R. STAUFFER, JR., THOMAS J. LOVULLO, AND KENNETH R. MCKAYE ... Lateral scales cten-oid; holotype with 34 pored lateral-line scales, paratypes with 33-34; pored scales posterior to hypural plate 1-2 (Table 1). Holotype with three scale rows on cheek, paratypes with ...

Research paper thumbnail of Dietary Variability of the Rainbow Darter (Etheostoma caeruleum) in Northwestern Pennsylvania

Northeastern Naturalist, Apr 28, 2020

Research paper thumbnail of Description of a new species of Petrotilapia (Teleostei: Cichlidae), from Lake Malaŵi, Africa

Proceedings of the Biological Society of Washington, Dec 22, 2006

... Juveniles are bright yellow. The new species is sympatric with P. genalutea and P. tridentige... more ... Juveniles are bright yellow. The new species is sympatric with P. genalutea and P. tridentiger, but underwater observations show preferences for different habitats and assortative mating among these sympatric species. Edward O. Murdy, Associate Editor. ...

Research paper thumbnail of Prey handling in Trematocranus placodon, a snail-eating cichlid fish from Malawi

Ichthyological Exploration of Freshwaters, Jun 7, 1991

Research paper thumbnail of Neutral Genetic and Phenotypic Variation within and among Isolated Headwater Populations of Brook Trout

Transactions of The American Fisheries Society, Nov 7, 2018

Research paper thumbnail of Critical Thermal Maxima in Populations of Ambystoma macrodactylum from Different Elevations

Journal of Herpetology, Dec 1, 1983

Research paper thumbnail of Influence of starvation on the preferred temperature of Oreochromis mossambicus (PETERS)

Archiv für Hydrobiologie

Oreochromis mossambicus from a single brood were split into two groups after being free swimming ... more Oreochromis mossambicus from a single brood were split into two groups after being free swimming for 31 days. One group was fed throughout the experiment and one group was starved. Temperature preference trials were conducted on each group. Starved fish ...

Research paper thumbnail of Temperature preference and tolerance of the spotted tilapia and Rio Grande cichlid

Research paper thumbnail of Temperature preference of the redbelly tilapia, Oreochromis zilli (GERVAIS)

Research paper thumbnail of Documentation of Freshwater Mussels (Unionidae) in the Diet of Round Gobies (Neogobius melanostomus) within the French Creek Watershed, Pennsylvania

The American Midland Naturalist, 2019

Abstract. The round goby (Neogobius melanostomus) was discovered in 2013 in the French Creek (All... more Abstract. The round goby (Neogobius melanostomus) was discovered in 2013 in the French Creek (Allegheny River Drainage) watershed and is the first documented invasion outside of the Lake Erie basin in Pennsylvania. The round goby throughout the Laurentian Great Lakes is known to eat dressenid mussels (Dreissenidae), but consumption of either dressenids or native mussels (Unionidae) in tributaries to Lake Erie is minimal based on low populations of any bivalves. The French Creek watershed, on the other hand, harbors 29 species of native freshwater mussels as well as introduced fingernail clams (Sphaeriidae; Corbicula fluminea). The objectives of this study were to document the diet of round gobies in the French Creek watershed to determine whether consumption of native freshwater mussels was occurring. Round gobies were collected in the summer months (May–Sept.) of 2016 via kick seine in four locations, dissected, and their stomach contents identified to lowest possible taxa. We separated the gobies into categories based on length classes, in order to determine if diet changed with increased size and age. Unionid mussels were consumed by all length classes, particularly in length class one (30–44 mm), but diet shifted to a dominance of sphaeriids in length class four (≥75 mm). Round gobies also consumed benthic aquatic insects, a large percentage of which were chironomids (greater than 24% in all size classes). This is the first documentation of unionid consumption by the round goby in Pennsylvania that poses possible threats to native mussels in the French Creek watershed.

Research paper thumbnail of Expanded Distributions of Three Etheostoma Darters (Subgenus Nothonotus) within the Upper Ohio River Watershed

Northeastern Naturalist, 2017

Abstract Within the upper Ohio River watershed, 3 Etheostoma darter species in the subgenus Notho... more Abstract Within the upper Ohio River watershed, 3 Etheostoma darter species in the subgenus Nothonotus have been documented in disjunct populations and were listed as threatened or endangered in Ohio and Pennsylvania. Tailwater habitat below navigation lock and dam (L/D) installations has been shown to contain diverse darter assemblages. Etheostoma camurum (Bluebreast Darter), E. maculatum (Spotted Darter), and E. tippecanoe (Tippecanoe Darter) often live in similar habitats; thus, we hypothesized that all 3 were occupying tailwater habitat below navigational L/Ds. Electrified benthic trawling verified Bluebreast Darter and Tippecanoe Darter below 8 L/D installations and at water depths varying from 1.4 m to 4.5 m and 1.4 m to 5.9 m, respectively. Spotted Darter was only found below 1 L/D. In the Ohio River, benthic trawling documented Bluebreast Darter and Tippecanoe Darter utilizing habitat located within deposition zones and areas above and below islands. Analysis of contemporary and historic distribution data shows that Bluebreast Darter and Tippecanoe Darter now span large sections of the river, but the range of Spotted Darter is more limited and warrants close monitoring. Our study confirms the effectiveness of utilizing benthic trawling in non-wadeable rivers to survey for benthic species such as river-inhabiting darters.

Research paper thumbnail of Status of Exotic Round Goby and Tubenose Goby in Pennsylvania

Northeastern Naturalist, 2016

Research paper thumbnail of Temperature Preference of Banded Killifish, Fundulus diaphanus, from Southwestern Pennsylvania

Research paper thumbnail of An Intergeneric Cyprinid Hybrid, Nocomis platyrhynchus × Notropis chrysocephalus, from the Greenbrier River Drainage in West Virginia

Research paper thumbnail of Hybridization between Etheostoma zonale and Etheostoma olmstedi (Teleostei: Percidae), Following an Introduction Event

Research paper thumbnail of Temperature Preference and Avoidance Responses of the Crayfish, Orconectes obscurus, and Associated Statistical Problems

Canadian Journal of Fisheries and Aquatic Sciences, 1982

Acute temperature selection and avoidance responses of the crayfish, Orconectes obscurus, acclima... more Acute temperature selection and avoidance responses of the crayfish, Orconectes obscurus, acclimated at field collection temperatures of 1.5–26.0 °C and determined in a spatial thermal gradient, were similar to those noted for fishes. Acclimation temperature was positively correlated with the acute preferred and avoided temperatures; both were several degrees higher than the acclimation temperature. A large proportion of the total variance in these data was unexplained. Most variable responses occurred at low acclimation temperatures. The estimated final preferred temperature ranged from 29.8 to 33.9 °C depending upon the method of calculation. Methods of estimating final preferenda from acute tests are considered arbitrary due to statistical problems and the associated high variability. Statistical problems were also noted in the determination of avoidance temperatures of crayfish due to nonindependence of observations on the same organism. No differences were noted (P < 0.05) b...