bluuebunny/crossref_metadata_2025_split huggingface dataset:
Eicosanoids: essential mediators in health and disease / Eicosanoide: bedeutende Faktoren in der Homöostase und ihre Bedeutung in der Pathogenese multipler Erkrankungen
Authors: Bruegel Mathias , Ceglarek Uta , Thiery Joachim 
Published: December 2009

Abstract
Eicosanoids are lipid mediators that are primarily oxidized from arachidonic acid by enzymatic or non-enzymatic peroxidation. The diverse and potent biological actions of eicosanoids on almost every cell reflect the central role of these mediators in maintenance of physiological homeostasis, of cell adhesion, vasomotion and organ functions. Eicosanoids were historically considered as terminal mediators, causing symptoms such as fever, pain, edema, smooth muscle contraction and inflammation. However, recent studies using gene knockout mice models for both enzymes and receptors have revealed that they also play a fundamental role in pathological processes and disease. Imbalance of the major lipid signaling pathways contribute to disease progression and chronic inflammation, autoimmunity, allergy, cancer, atherosclerosis, metabolic and degenerative diseases. A systematic, multiparametric eicosanoid analysis in various diseases could unravel the underlying biology and disease pathology, possibly resulting in new diagnostic and therapeutic strategies. The aim of our review is to discuss the different eicosanoid pathways and the impact of these essential mediators in human health and disease.
Distribution of Off-Flavor Compounds and Isolation of Geosmin-Producing Bacteria in a Series of Water Recirculating Systems for Rainbow Trout Culture
Authors: Schrader Kevin K , Summerfelt Steven T 
Published: December 2009

Abstract
Preharvest off-flavor in aquaculture products results in large economic losses to producers due to delayed harvest. The common off flavors “earthy” and “musty” are due to the presence of geosmin and 2-methylisoborneol (MIB), respectively. Although certain species of cyanobacteria are responsible for these problems in pond-cultured fish, the microbial sources of geosmin and MIB in recirculating aquaculture systems (RASs) are still being explored. In this study, we investigated (1) the distribution of geosmin and MIB within six replicated RASs producing rainbow trout Oncorhynchus mykiss and (2) the microorganisms responsible for earthy off-flavor in the flesh of RAS-cultured trout. Water, biosolids, and fish samples were collected when fish were at maximum feed levels and before harvest. Each RAS contained a fluidized-sand biofilter, a cascade aeration column, a low-head oxygenation (LHO) unit, an LHO sump, a 5.3-m3 culture tank, a drum filter, a pump sump, and a heat exchanger. Solid phase microextraction–gas chromatography–mass spectrometry (SPME–GC–MS) was used to determine the levels of geosmin and MIB in the collected samples. Water and biosolid samples were used to inoculate media for culturing microorganisms capable of producing geosmin, MIB, or both (e.g., actinomycetes, cyanobacteria, fungi, and myxobacteria). Microbial isolates producing an earthy–musty odor were subjected to SPME–GC–MS analysis to verify geosmin and MIB production. Geosmin levels were higher and more prevalent than MIB in water, biosolids, and trout fillets. In addition, geosmin levels were higher in biosolids than in water. The earthy-odor-producing actinomycetes Nocardia cummidelens, N. fluminea, Streptomyces luridiscabiei, and Streptomyces cf. albidoflavus, were isolated from biosolids contained within the RAS drum filters and heat exchangers, and these isolates were subsequently confirmed to be geosmin producers. No other geosmin-producing microorganisms were isolated. These isolates were the likely source of the geosmin in the RAS water and contributors to the earthy off-flavor in the trout.
The Importance of Phosphorus and Copper Carryover in Pond Sediments for Juvenile Percid Survival, Growth, and Yield
Authors: Tew Kwee Siong , Conroy Joseph D , Culver David A 
Published: December 2009

Abstract
Over-fertilization with phosphorus and carryover copper residual in the sediment from copper sulfate treatment in double-cropped ponds were suspected as the primary causes of low larval percid survival in coolwater aquaculture ponds. Consequently, in this study, we compared saugeye (male sauger Sander canadensis × female walleye S. vitreus) survival, growth, and yield among ponds that were single-cropped with only saugeyes in the spring during the previous two consecutive years (SS ponds) and ponds that were double-cropped (with saugeye culture in the spring and channel catfish Ictalurus punctatus culture in the summer) during the previous two consecutive years (DD ponds). We also compared sediment phosphorus (soluble reactive phosphorus [SRP] and total phosphorus [TP]), sediment copper concentrations, phytoplankton biomass, and zooplankton biomass. Fish survival (number harvested) and fish yield (mass harvested) were significantly lower in DD ponds than in SS ponds in 2001 but were similar in 2002 (a year of wide temperature fluctuation early in the production season). Sediment analyses revealed that DD ponds had significantly lower SRP and TP but higher copper concentrations than did SS ponds. A detailed study done in 2002 revealed that individual length and wet weight of percids were significantly higher in the SS ponds than in DD ponds; phytoplankton biomass was similar in both sets of ponds, while zooplankton biomass was significantly lower in DD ponds. These results suggest that residual materials used in double-cropped channel catfish ponds may negatively affect subsequent years' percid culture.
Genetic Variation of 17 Wild Yellow Perch Populations from the Midwest and East Coast Analyzed via Microsatellites
Authors: Grzybowski Michael , Sepulveda‐Villet Osvaldo J. , Stepien Carol A. , Rosauer Daniel , Binkowski Frederick , Klaper Rebecca , Shepherd Brian , Goetz Frederick 
Published: December 2009

AbstractWe used microsatellite loci, including seven newly developed by us, to analyze the population genetic structure of wild yellow perchPerca flavescensfrom 17 sampling areas in the upper Midwest and East Coast of the United States. Our results reveal greater genetic differentiation and finer‐scale geographic structure than were found in previous studies of yellow perch population structure. These findings show pronounced genetic divergence between Midwest and East Coast samples. Additional genetic partitioning was noted between Chesapeake Bay and Albemarle Sound populations, between inland lakes in the upper Mississippi River system, and among sites in Lake Michigan and Lake Ontario. Further, the structuring of yellow perch populations within the Chesapeake Bay may be significantly influenced by salinity. These findings are being used to help delineate wild populations for the development of captive yellow perch broodstocks for the aquaculture industry.
Marine Distributions of Chinook Salmon from the West Coast of North America Determined by Coded Wire Tag Recoveries
Authors: Weitkamp Laurie A. 
Published: December 2009

AbstractThe coded wire tag (CWT) database contains detailed information on millions of Pacific salmonOncorhynchusspp. released from hatcheries or smolt traps and recovered in the north Pacific Ocean and its tributaries. I used this data set to examine the spatial and temporal variation in the marine distributions of 77 hatchery and 16 wild populations of Chinook salmonO. tshawytschabased on recoveries of an estimated 632,000 tagged salmon in coastal waters from southern California to the Bering Sea during 1979–1994 (and 1995–2004 for select hatcheries). Chinook salmon showed 12 distinct region‐specific recovery patterns. Chinook salmon originating in a common freshwater region had similar marine distributions, which were distinct from those of adjacent regions. Different run types (e.g., spring, summer, and fall runs) originating in the same region exhibited variation in their marine distributions consistent with recovery at different stages of their ocean residence period. Recovery patterns were surprisingly stable across years, despite high interannual variation in ocean conditions. By contrast, ocean age influenced recovery patterns, as older fish were recovered further from their natal stream than younger fish. Although most of the CWT data used in the analysis came from hatchery fish, recoveries of tagged wild populations indicate patterns similar to those of fish from nearby hatcheries. The consistency in these findings across broad geographic areas suggests that they apply to Chinook salmon across the entire Pacific Rim. Similar findings for tagged coho salmonO. kisutchindicate that the observed patterns may apply to Pacific salmon as a whole and provide a model for other highly migratory fishes that have not benefited from such intensive tagging programs. The results also have implications for the genetic control of migration and salmon's ability to respond to climate change.
Ninespine Stickleback Abundance in Lake Michigan Increases after Invasion of Dreissenid Mussels
Authors: Madenjian Charles P. , Bunnell David B. , Gorman Owen T. 
Published: December 2009

AbstractBased on data from our annual lakewide bottom trawl survey of Lake Michigan, we determined that density of ninespine sticklebacks Pungitius pungitius increased from an average of 0.234 kg/ha during 1973–1995 to an average of 1.318 kg/ha during 1996–2007. This greater‐than‐fivefold increase in density coincided with the dreissenid mussel invasion of Lake Michigan. Intervention analysis revealed that ninespine stickleback density in Lake Michigan significantly increased between the two time periods. In contrast, based on data from our annual bottom trawl survey of U.S. waters of Lake Superior, ninespine stickleback density decreased from an average of 0.133 kg/ha during 1978–1999 to an average of only 0.026 kg/ha during 2000–2007. This greater‐than‐fivefold density decrease, which was found to be significant via intervention analysis, coincided with population recovery for both lean and fat morphotypes of lake trout Salvelinus namaycush in Lake Superior. In contrast to Lake Michigan, dreissenid mussels have not invaded Lake Superior on a lakewide basis. Thus, a comparison of these two lakes indicated that the increase in ninespine stickleback abundance in Lake Michigan was most likely attributable to the dreissenid mussel invasion. In addition, based on our correlation analysis, alewives Alosa pseudoharengus did not have an adverse effect on ninespine stickleback abundance in Lake Michigan. Perhaps the recent increase in biomass of green algae Cladophora spp. associated with the dreissenid mussel invasion improved spawning habitat quality for ninespine sticklebacks and led to their stepwise abundance increase in Lake Michigan beginning in 1996.
Early Marine Survival and Behavior of Steelhead Smolts through Hood Canal and the Strait of Juan de Fuca
Authors: Moore Megan E. , Berejikian Barry A. , Tezak Eugene P. 
Published: December 2009

AbstractThe depressed status of Puget Sound populations of steelhead Oncorhynchus mykiss contrasts with the healthier condition of those along the coast of Washington and suggests that there is substantial smolt mortality during the migration through Puget Sound to the Pacific Ocean. Acoustic telemetry transmitters and stationary receivers were used to investigate the survival, migration timing, and migratory behavior of 159 steelhead smolts in 2006 and 187 smolts in 2007 from four Hood Canal (part of Puget Sound) streams and one stream flowing into the Strait of Juan de Fuca. The estimated population‐specific survival rates for wild and hatchery smolts from the river mouths to the northern end of Hood Canal (28.1–75.4 km) ranged from 55% to 86% in 2006 and from 62% to 84% in 2007. Survival was much lower from the northern end of Hood Canal to the Strait of Juan de Fuca (135 km) in 2006 (23–49%) and could not be reliably measured in 2007. Travel rates through Hood Canal (8–10 km/d) were significantly lower than those estimated as the fish migrated through northern Puget Sound and the Strait of Juan de Fuca (26–28 km/d), while the mortality rates per unit of distance traveled were very similar in the two segments. The high daily mortality rates estimated during the early marine phase of the steelhead life cycle (2.7%/d) suggest that mortality rates decrease substantially after steelhead enter the Pacific Ocean.
Ambient pH and the Response to Chemical Alarm Cues in Juvenile Atlantic Salmon: Mechanisms of Reduced Behavioral Responses
Authors: Leduc Antoine O.H.C. , Roh Ellie , Macnaughton Camille J. , Benz Frederic , Rosenfeld Jordan , Brown Grant E. 
Published: December 2009

AbstractEven at sublethal concentrations, various anthropogenic pollutants may disrupt the transfer of chemosensory information, often inducing maladaptive behavioral responses. Recent studies of freshwater prey fishes have shown impaired abilities to respond to damage‐released chemical alarm cues from conspecifics under weakly acidic conditions (pH ∼ 6.0). Several factors acting individually or collectively may account for such chemosensory impairment. By itself, acidification may chemically disrupt the alarm cues and affect fish olfactory functions. Alternatively, differences in local environmental conditions may affect biochemical composition, quantity of chemical alarm cues produced by epidermal tissue, or both, leading to variations in alarm response. Our goal was to assess whether the ability to produce and detect conspecific chemical alarm cues is similar in individuals reared under neutral versus acidic conditions. We conducted two experiments in which we measured the behavioral response of wild juvenile Atlantic salmonSalmo salarexposed to chemical alarm cues. In particular, we looked for differences in the ability of individual fish to (1) produce alarm cues capable of eliciting consistent antipredator behavior in conspecifics and (2) detect alarm cues upon the fish's introduction into a stream with a pH differing from that of the stream of origin; the latter experiment involved reciprocal transplant of fish between neutral (pH range ∼ 7.0–7.3) and acidic (pH range ∼ 5.9–6.3) sites. Our results demonstrate that the ability to produce and respond to chemical alarm cues is maintained in Atlantic salmon reared under acidic conditions and did not differ from that of fish reared under neutral conditions. Overall, these data suggest that no permanent olfactory damage occurred under reduced pH and, likewise, no significant difference in functional alarm cue production existed between Atlantic salmon reared under neutral and acidic conditions. Short‐term reduction in olfactory sensitivity and degradation of the chemical alarm cues under acidic conditions are the likely mechanisms affecting detection of these important chemicals by prey fish.
Rapid, Efficient Growth Reduces Mercury Concentrations in Stream‐Dwelling Atlantic Salmon
Authors: Ward Darren M. , Nislow Keith H. , Chen Celia Y. , Folt Carol L. 
Published: December 2009

AbstractMercury (Hg) is a potent toxin that biomagnifies in aquatic food webs. Large fish generally have higher Hg concentrations than small fish of the same species. However, models predict that fish that grow large faster will have lower Hg concentrations than small, slow‐growing fish owing to somatic growth dilution (SGD). We examined the relationship between Hg concentration and growth rate in fish by means of a large‐scale field experiment. Atlantic salmon Salmo salar fry hatched under uniform initial conditions were released at 18 sites in natural streams, collected after one growing season, and measured with respect to Hg concentration and growth. As expected for Hg accumulation from food, the Hg concentrations in the fish tracked those in their prey. Nonetheless, large, fast‐growing fish had lower Hg concentrations than small, slow‐growing ones, consistent with SGD. While the Hg concentration of the prey accounted for 59% of the explained variation in the Hg concentration in the Atlantic salmon across sites, the salmon growth rate accounted for 38%. A mass‐balance Hg accumulation model shows that such SGD occurs when fast growth is associated with high growth efficiency. Fish growth is tremendously variable and sensitive to anthropogenic impacts, so the SGD of Hg has important implications for fisheries management.
Road Crossing Designs and Their Impact on Fish Assemblages of Great Plains Streams
Authors: Bouska Wesley W. , Paukert Craig P. 
Published: December 2009

AbstractA mark–recapture field study was conducted to determine fish passage at 5 concrete box culverts and 5 low‐water crossings (concrete slabs vented by culverts) as well as 10 control sites (below a natural riffle) in Flint Hills streams of northeastern Kansas. Additionally, we tested the upstream passage of four fish species native to Great Plains streams (Topeka shiner Notropis topeka, green sunfish Lepomis cyanellus, red shiner Cyprinella lutrensis, and southern redbelly dace Phoxinus erythrogaster) through three simulated crossing designs (box culverts, round corrugated culverts, and natural rock riffles) at water velocities of 0.1 to 1.1 m/s in an experimental stream. The field study indicated that cyprinids were twice as likely to move upstream of box culverts than low‐water crossings and 1.4 times as likely to move upstream of control reaches than any crossing type. The best models indicated that the proportion of cyprinids that moved upstream increased with decreased culvert slope and length, perching, and increased culvert width. Our controlled experiment indicated that fish can move through velocities up to 1.1 m/s in a 1.86‐m simulated stream and that the proportion of fish that moved upstream did not differ among crossing designs for southern redbelly dace, green sunfish, or Topeka shiner; however, natural rock riffles had lower proportional movements (mean = 0.19) than the box (0.38) or corrugated culvert designs (0.43) for red shiners. Water velocity did not affect the proportional upstream movement of any species except that of Topeka shiners, which increased with water velocity. Crossing design alone may not determine fish passage, and water velocities up to 1.1 m/s may not affect the passage of many Great Plains fishes. Barriers to fish movement may be the result of other factors (e.g., perching, slope, and crossing length). The use of properly designed and installed crossings has promise in conserving Great Plains stream fishes.
Catch Rates and Biological Characteristics of Bluntnose Sixgill Sharks in Puget Sound
Authors: Williams Gregory D. , Andrews Kelly S. , Farrer Deborah A. , Levin Phillip S. 
Published: December 2009

AbstractThe bluntnose sixgill shark Hexanchus griseus is a wide‐ranging marine predator and the largest predatory shark in Puget Sound. Biological characteristics of the Puget Sound bluntnose sixgill shark population remain largely undocumented, despite a recent escalation in recreational angling for the species. Standardized longline sampling, supplemented with other opportunistic collections, was used to collect size, sex ratio, and relative catch rate data at three locations during 2006–2008. Fishing trials were also used to examine the effect of soak time, fishing depth, and time of day on catch rates. Captured bluntnose sixgill sharks were exclusively subadults (175–315 cm total length) found in approximately equal sex ratios in all seasons. Catch rates were highest in Elliott Bay, the urbanized port of Seattle, Washington, and were not affected by sampling season. Catch information derived from hook timers implies that the sharks locate and encounter baited hooks relatively rapidly (<2 h); diel fishing trials suggest some trend toward lower catch rates at shallower sites during the day. Data collected in this study provide some basic context for informing management decisions associated with a large marine predator in the Puget Sound–Georgia Basin ecosystem and improve our basic understanding of bluntnose sixgill shark biology in the region.
Seasonal variations of metal concentrations in periphyton and taxonomic composition of the algal community at a Yenisei River littoral site
Authors: Anishchenko Olesya , Gladyshev Michail , Kravchuk Elena , Ivanova Elena , Gribovskaya Iliada , Sushchik Nadezhda 
Published: December 2009

AbstractThe concentrations of metals K, Na, Ca, Mg, Fe, Mn, Zn, Cu, Ni, Pb, Co and Cr, in the water and periphyton (epilithic algal communities) were studied at a site in the middle stream of the Yenisei River (Siberia, Russia) during three years using monthly sampling frequencies. Despite considerable seasonal variations in aquatic concentrations of some metals, there was no correlation between metal contents in the water and in periphyton. Seasonal concentration variations of some metals in periphyton were related to the species (taxonomic) composition of periphytic microalgae and cyanobacteria. Enhanced levels of Ni and Co in periphyton in late autumn, winter, and early spring were likely caused by the predominance of cyanobacteria in the periphytic community, and annual maximum levels of K in periphyton in late spring and early summer were attributed to the domination of Chlorophyta, primarily Ulothrix zonata.
The Organisational and Personnel Aspects of Introducing ICT into Grammar Schools
Authors: Zakrajšek Srečko 
Published: December 2009

The Organisational and Personnel Aspects of Introducing ICT into Grammar Schools
This article presents the results of comparisons between investment into ICT and the current state of equipment in Slovenian high schools compared to similar schools in the EU member states. Extensive research is based on surveying and interviews with the headmasters of 10 Slovenian high schools, jointly representing a typical sample of schools, as well as the different aspects of using ICT in their schools. The research results have shown that Slovenian high schools are substantially worse equipped with ICT than similar schools in the developed countries of the EU. This is evident in the lack of modern forms of organization, operation and education based on ICT. Slovenian high schools can only modernize their organization and operations if the Slovenian government starts investing substantially more into purchasing equipment, teacher training and the promotion of the knowledge, skills and competences that can only be developed using ICT.