Essays about: "spawning time"

Showing result 1 - 5 of 34 essays containing the words spawning time.

  1. 1. Can spawning site temperature regimes cause spawning time divergence in sympatric whitefish ecotypes? : Comparison of two hypotheses

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Joni Riihimaa; [2023]
    Keywords : Coregonus lavaretus; Hatching time; Spawning habitat; Spawning time; Temperature dependence;

    Abstract : The spawning time differs between sympatric ecotypes of lake-dwelling whitefish (Coregonus lavaretus) and this temporal divergence can be linked to the type of spawning habitat used (i.e., streams, littoral or profundal). READ MORE

  3. 2. Evolutionary conservation analysis of sequence variants underlying ecological adaptation in Atlantic herring

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Leyi Su; [2023]
    Keywords : Ecological adaptation; Evolutionary conservation; Atlantic herring;

    Abstract : The Atlantic herring (Clupea harengus) is a model organism for exploring the genetic basis of ecological adaptation on account of its large effective population size which greatly restrains the disturbance of genetic drift. In this project, I conducted an evolutionary conservation analysis of the Atlantic herring genome using conservation scores generated by phastCon, phyloP and GERP++ in order to study the sequence variants related to salinity or spawning-time adaptation in Atlantic herring. READ MORE

  4. 3. Evaluating an increased spill regime as a management tool to improve downstream passage of salmon smolt

    University essay from Karlstads universitet/Institutionen för miljö- och livsvetenskaper (from 2013)

    Author : Mattias Hansson; [2022]
    Keywords : hydraulic modeling; hydroacoustic telemetry; time to event analysis; hydraulisk modellering; överlevnadsanalys; hydroakustisk telemetri;

    Abstract : The anadromous Atlantic salmon (Salmo salar) is dependent on river connectivity to reach spawning and rearing habitats in rivers. Most rivers are today fragmented by artificial barriers such as hydroelectric powerplants (HEP) which impede this migratory movement. READ MORE

  5. 4. Restaureringens effekt på öringpopulationen

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Ola Carlström; Sebastian Dagman; [2022]
    Keywords : restaurering; flottning; öring; älv; bäck;

    Abstract : Until the 1970s, rivers in Sweden were used for timber floating. In order for the floating to be as efficient as possible, with a minimum of timber getting stuck, many rivers were cleared. Large rocks and boulders were removed from the main channel and tributaries, backwaters and shallow areas were secluded. READ MORE

  6. 5. Aspects of erosion of restored trout spawning beds in two streams in Northern Sweden

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Frida Michelle Granlund; [2021]
    Keywords : in-stream restoration; reproductive habitat; salmonids; passive integrated transponders tags PIT-tags ;

    Abstract : Many rivers and streams in northern Sweden have been channelized due to timber floating. This has severely degraded the spawning habitats for salmon and trout, and therefore a common action when restoring channelized rivers is to establish new spawning beds by adding gravel to the streambed. READ MORE