Life Sciences Commons^™

Review Of The Family Rivulidae (Cyprinodontiformes, Aplocheiloidei) And A Molecular And Morphological Phylogeny Of The Annual Fish Genus Austrolebias Costa 1998, Marcelo Loureiro, Rafael O. De Sá, Sebastián W. Serra, Felipe Alonso, Luis Esteban Krause Lanés, Matheus Vieira Volcan, Pablo Calviño, Et. Al.

Biology Faculty Publications

The family Rivulidae is the fourth most diverse clade of Neotropical fishes. Together with some genera of the related African family Nothobranchiidae, many rivulids exhibit a characteristic annual life cycle, with diapausing eggs and delayed embryonic development, which allows them to survive in the challenging seasonal ponds that they inhabit. Rivulidae also includes two species known as the only the self-fertilizing vertebrates and some species with internal fertilization. The first goal of this article is to review the systematics of the family considering phylogenetic relationships and synapomorphies of subfamilial clades, thus unifying information that is dispersed throughout the literature. From …

Across The Indian Ocean: A Remarkable Example Of Trans-Oceanic Dispersal In An Austral Mygalomorph Spider [Dataset], Sophie E. Harrison, Mark S. Harvey, Steven J.B. Cooper, Andrew D. Austin, Michael G. Rix

Research Datasets

The Migidae are a family of austral trapdoor spiders known to show a highly restricted and disjunct distribution pattern. Here, we aim to investigate the phylogeny and historical biogeography of the group, which was previously thought to be vicariant in origin, and examine the biogeographic origins of the genus Moggridgea using a dated multi-gene phylogeny. Moggridgea specimens were sampled from southern Australia and Africa, and Bertmainus was sampled from Western Australia. Sanger sequencing methods were used to generate a robust six marker molecular dataset consisting of the nuclear genes 18S rRNA, 28S rRNA, ITS rRNA, XPNPEP3 and H3 and the …

Diversity And Phylogenetic Relationships Of European Species Of Crepidostomum Braun, 1900 (Trematoda: Allocreadiidae) Based On Rdna, With Special Reference To Crepidostomum Oschmarini Zhokhov & Pugacheva, 1998, Romualda Petkevičiūtė, Virmantas Stunžėnas, Alexander E. Zhokhov, Larisa G. Poddubnaya, Gražina Stanevičiūtė

Harold W. Manter Laboratory of Parasitology: Faculty and Staff Publications

Background

Within the genus Crepidostomum Braun, 1900, identification of species and taxonomic decisions made only on the basis of adult morphology have resulted in great problems associated with evaluating actual diversity and validity of species. Life cycle data, while equal in importance to adult characters, are scarce, controversial or incomplete for most Crepidostomum spp. In this study, rDNA sequences generated from adult and larval Crepidostomum spp. and some other allocreadiid species were analyzed to reveal the diversity and phylogenetic relationships of the species and their host range. Detailed morphological description based on light microscopy, SEM tegumental surface topography and genetic …

The Effect Of Size On Juvenile Green Sturgeon (Acipenser Medirostris) Behavior Near Water-Diversion Fish Screens, Jamilynn B. Poletto, Dennis E. Cocherell, Natalie Ho, Joseph J. Cech Jr., A. Peter Klimley, Nann A. Fangue

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Anthropogenic water management projects and facilities that alter the local and regional hydrology of riverine environments greatly influence the behavior, physiology, and survival of native fishes. To mitigate for losses of native fishes at these structures, many are outfitted with fish-exclusion screens to reduce entrainment. The effect of fish size and age on behavior near fish screens, however, is largely unknown. Therefore, we tested two size classes of juvenile green sturgeon (Acipenser medirostris; small, early juveniles: 9.2 ± 0.2 cm fork length [FL], 6.9 ± 0.3 g; intermediate juveniles: 18.8 ± 0.2 cm FL, 36.9 ± 0.8 g) …

Resilience In Environmental Risk And Impact Assessment: Concepts And Measurement, David G. Angeler, Craig R. Allen, Ahjond S. Garmestani, Kevin L. Pope, Dirac L. Twidwell Jr, Micro Bunschuh

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Different resilience concepts have different assumptions about system dynamics, which has implications for resilience-based environmental risk and impact assessment. Engineering resilience (recovery) dominates in the risk assessment literature but this definition does not account for the possibility of ecosystems to exist in multiple regimes. In this paper we discuss resilience concepts and quantification methods. Specifically, we discuss when a system fails to show engineering resilience after disturbances, indicating a shift to a potentially undesired regime. We show quantification methods that can assess the stability of this new regime to inform managers about possibilities to transform the system to a more …

Effects Of Large-Scale Wetland Loss On Network Connectivity Of The Rainwater Basin, Nebraska, Bram H. F. Verheijen, Dana M. Varner, David A. Haukos

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Context The Rainwater Basin region in south-central Nebraska supports a complex network of spatiallyisolated wetlands that harbor diverse floral and faunal communities. Since European settlement, many wetlands have been lost from the network, which has increased distances among remaining wetlands. As a result, populations of wildlife species with limited dispersal capabilities may have become isolated and face greater local extinction risks.

Objectives We compared the pre-European settlement and current extent of the Rainwater Basin network to assess the effects of wetland losses on network connectivity for a range of maximum dispersal distances.

Methods We constructed network models for a range …

A Framework For Tracing Social–Ecological Trajectories And Traps In Intensive Agricultural Landscapes, Daniel R. Uden, Craig R. Allen, Francisco Munoz-Arriola, Gengxin Ou, Nancy Shank

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Charting trajectories toward sustainable agricultural development is an important goal at the food–energy–water–ecosystem services (FEWES) nexus of agricultural landscapes. Social–ecological adaptation and transformation are two broad strategies for adjusting and resetting the trajectories of productive FEWES nexuses toward sustainable futures. In some cases, financial incentives, technological innovations, and/or subsidies associated with the short-term optimization of a small number of resources create and strengthen unsustainable feedbacks between social and ecological entities at the FEWES nexus. These feedbacks form the basis of rigidity traps, which impede adaptation and transformation by locking FEWES nexuses into unsustainable trajectories characterized by control, stability, and efficiency, …

New Applications Of Radio Frequency Identification Stations For Monitoring Fish Passage Through Headwater Road Crossings And Natural Reaches, Ian R. Macleod, Charles J. Gagen

Faculty Publications - Biological Sciences

Within the Ouachita National Forest, roads and streams intersect each other thousands of times. Many of these road crossings alter stream hydrology and potentially limit longitudinal fish movement. To investigate the potential impacts of these road crossings on fish passage, we monitored movements of 3 native fish species (n = 2,171) individually tagged with radio frequency identification (RFID) tags in 2012 and 2013. We installed solar-powered RFID stations in 2 streams with road crossings and 2 reference streams without road crossings. Each of the 4 monitoring stations included a pair of antennas bracketing a road crossing (or similarly-sized natural reach) …

Vims Shark Longline Annual Report - 2018, Multispecies Research Group, Virginia Institute Of Marine Science

Reports

Report indicates the number of species caught, retained, released and tagged in the longline surveys.

Develop And Test Fish Pot Cull Rings, Wallace Emery Lewis Jr.

Reports

Fish potting is a growing fishery in Virginia’s rivers and catfish is the primary targeted species. Demand for catfish is strong, and prices are good, but there is a lot of sorting and fish handling because the demand is for 2-8 pound fish. Traditionally, cull rings are used successfully in various traps/pots to let smaller fish/crabs escape and to reduce the labor and expense to manually sort and discard smaller animals. The use of cull rings in catfish pots, or hoop-nets, has not been studied in the Virginia catfish fishery. If cull rings could be successfully designed and placed within …

Determine Methods To Reduce Bycatch Of Juvenile Atlantic Croaker (Micropogonias Undulates) In Haul Seines, George Earl Trice V

Reports

The juvenile Atlantic Croaker ( Micropogonias undulates ) population is being severely cut down in the summer months by haul seines in the Chesapeake bay. It is common for commercial haul seines to land thousands of pounds of fish. When these fish are processed a large percentage of the smallest fish are sold on the bait market for a low price of .04 cents per pound. The high amount of small baitfish harvested annually by haul seines is only hurting future harvest of larger, more valuable fish. The bait caught is mostly Croaker but also includes Spot (leiostomus xanthurus), Spotted …

Genetic Assessment Of Inbred Chicken Lines Indicates Genomic Signatures Of Resistance To Marek's Disease, Lingyang Xu, Yanghua He, George E. Liu, Huanmin Zhang, Hans H. Cheng, Robert L. Taylor Jr, Jiuzhou Song

Faculty & Staff Scholarship

Background: Marek’s disease (MD) is a highly contagious pathogenic and oncogenic disease primarily affecting chickens. However, the mechanisms of genetic resistance for MD are complex and not fully understood. MD-resistant line 63 and MD-susceptible line 72 are two highly inbred progenitor lines of White Leghorn. Recombinant Congenic Strains (RCS) were developed from these two lines, which show varied susceptibility to MD.

Results: We investigated genetic structure and genomic signatures across the genome, including the line 63 and line 72, six RCSs, and two reciprocally crossed flocks between the lines 63 and 72 (F1 63 × 72 and F1 72 × …