30 research outputs found
The CompactLight Design Study
CompactLight is a Design Study funded by the European Union under the Horizon 2020 researchand innovation funding programme, with Grant Agreement No. 777431. CompactLight was conducted byan International Collaboration of 23 international laboratories and academic institutions, three privatecompanies, and five third parties. The project, which started in January 2018 with a duration of 48months, aimed to design an innovative, compact, and cost-effective hard X-ray FEL facility complementedby a soft X-ray source to pave the road for future compact accelerator-based facilities. The result is anaccelerator that can be operated at up to 1 kHz pulse repetition rate, beyond today’s state of the art, usingthe latest concepts for high brightness electron photoinjectors, very high gradient accelerating structuresin X-band, and novel short-period undulators. In this report, we summarize the main deliverable of theproject: the CompactLight Conceptual Design Report, which overviews the current status of the designand addresses the main technological challenges
Data from: Human-mediated evolution in a threatened species? Juvenile life-history changes in Snake River salmon
Evaluations of human impacts on Earth's ecosystems often ignore evolutionary changes in response to altered selective regimes. Freshwater habitats for Snake River fall Chinook salmon (SRFCS), a threatened species in the U.S., have been dramatically changed by hydropower development and other watershed modifications. Associated biological changes include a shift in juvenile life history: historically essentially 100% of juveniles migrated to sea as subyearlings, but a substantial fraction have migrated as yearlings in recent years. In contemplating future management actions for this species should major Snake River dams ever be removed (as many have proposed), it will be important to understand whether evolution is at least partially responsible for this life-history change. We hypothesized that if this trait is genetically based, parents who migrated to sea as subyearlings should produce faster-growing offspring that would be more likely to reach a size threshold to migrate to sea in their first year. We tested this with phenotypic data for over 2600 juvenile SRFCS that were genetically matched to parents of hatchery and natural origin. Three lines of evidence supported our hypothesis: 1) the animal model estimated substantial heritability for juvenile growth rate for three consecutive cohorts; 2) linear modeling showed an association between juvenile life history of parents and offspring growth rate; and 3) faster-growing juveniles migrated at greater speeds, as expected if they were more likely to be heading to sea. Surprisingly, we also found that parents reared a full year in a hatchery produced the fastest-growing offspring of all—apparently an example of cross-generational plasticity associated with artificial propagation. We suggest that SRFCS is an example of a potentially large class of species that can be considered to be “anthro-evolutionary”—signifying those whose evolutionary trajectories have been profoundly shaped by altered selective regimes in human-dominated landscapes
Life history data
Contains information about growth rate of juvenile offspring and life history information about their parent
Parental genotypes
Microsatellite genotypes for all adults spawned 2007-200
Juvenile migration data
Contains information about migration of tagged juvenile salmon through the Snake and Columbia River hydropower syste
Offspring genotypes
Microsatellite genotypes for juveniles used in this stud
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Influence of river conditions on survival and travel time of Snake River subyearling fall chinook salmon
From 1995 to 2000, subyearling fall chinook salmon Oncorhynchus tshawytscha reared at Lyons Ferry Hatchery were PIT-tagged at the hatchery, trucked upstream, acclimated, and released into free-flowing sections of the Snake River weekly from early June to mid-July. We estimated survival probabilities and travel time through the lower Snake River and detection probabilities at dams for each weekly release group. The average median time between release and arrival at Lower Granite Dam was 43.5 d. For each group, we split this time into two nearly equal (on average) periods: one when most fish in the group were rearing and one when most fish had apparently begun active seaward migration. The estimated survival for hatchery fish from release to the tailrace of Lower Granite Dam decreased with release date each year. The estimated survival through this reach was significantly correlated with three environmental variables: survival decreased as discharge ( flow ) decreased, as water transparency increased, and as water temperature increased. Because the environmental variables were highly correlated among themselves, we were unable to determine whether any factors were more important than the others. All three factors have plausible biological consequences for rearing and actively migrating fish, and survival is probably influenced by all of them and possibly by interactions among them as well. Summer flow augmentation will increase discharge and decrease water temperature (provided the additional water is not too warm) and probably increase the speed of seaward migration of smolts, all of which are beneficial to the recovery of threatened Snake River fall chinook salmon
Die Auswirkung von medikamentoesen Behandlungen auf den Fischorganismus Teil B: Rueckstandsanalysen von Antibiotika aus Proben von Muskulatur (''Filet''), Leber, Milz und Niere. Schlussbericht. Abschlussdatum: Dezember 1984
TIB: RN 1947 (85-002) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman