Essays about: "Gasterosteus aculeatus"

Showing result 6 - 10 of 11 essays containing the words Gasterosteus aculeatus.

  1. 6. Effect of temporal increases in prey fish abundance on individual growth rates of coastal piscivores

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

    Author : Johan Penner; [2016]
    Keywords : Three-spined stickleback; Perch; Growth; Intraguild Predation; Ontogeny; Baltic Sea.;

    Abstract : Commercial fishing in the Baltic Sea has led to decrease in abundance of large predatory fish and as a result the predation pressure on smaller fish species has been reduced. Three-spined stickleback (Gasterosteus aculeatus) is among the species that have benefited from reduced predation pressure. READ MORE

  3. 7. An ecological study of the migration, food composition and relative abundance of three-spined stickleback (Gasterosteus aculeatus) in a shallow area in Kalmar Sound.

    University essay from Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Author : Peter Söderling; [2013]
    Keywords : Three-spined stickleback; Gasterosteus aculeatus; migration; abundance; population; decline; increase; food; prey; predate; pike; perch; roach; spring; spawn; recruitment; shallow; Kalmar; Baltic; Storspigg; spigg; vandring; förekomst; population; populationsökning; populationsminskning; föda; byte; predera; predator; gädda; abborre; mört; vår; vårlekande; föryngring; lek; grunt; Kalmar; Kalmarsund; Östersjön;

    Abstract : The populations of three–spined sticklebacks (Gasterosteus aculeatus) in the Baltic Sea have increased tenfold over the last decade. A large increase in abundance can alter the offshore and coastal food webs. READ MORE

  4. 8. Resource use and consumption of three-spined sticklebacks (Gasterosteus aculeatus) under different environmental conditions during winter.

    University essay from Institutionen för ekologi, miljö och geovetenskap

    Author : David Bystedt; [2013]
    Keywords : fish; consumption; light condition; winter; climate change;

    Abstract : In temperate climate with pronounced seasonality, ice and snow cover reduces light conditions during winter which in turn reduce search efficiency for visual feeding consumers like fish. Furthermore, a suggested major effect of future climate change is an increased input of allochtonous DOC to aquatic systems which causes an increased brownification and hence reduced overall light conditions. READ MORE

  5. 9. Does eutrophication cause directional genetic selection in three-spined stickleback (Gasterosteus aculeatus)? : A study of multiple Baltic Sea populations.

    University essay from Institutionen för livsvetenskaper

    Author : Malin Borg; [2011]
    Keywords : Gasterosteus aculeatus; Population genetics; Natural selection; Eutrophication; Baltic Sea; AFLP;

    Abstract : Human-induced eutrophication is indirectly affecting aquatic organisms by altering their environment. This brings on altered selective pressures and could thereby cause changes in the genetic composition of exposed populations. READ MORE

  6. 10. Does eutrophication cause directional genetic selection in three-spined sticklebacks (Gasterosteus aculeatus)? : A study of multiple Baltic Sea populations

    University essay from Institutionen för livsvetenskaper

    Author : Malin Borg; [2011]
    Keywords : Gasterosteus aculeatus; Population genetics; Natural selection; Eutrophication; Baltic Sea; AFLP;

    Abstract : Human-induced eutrophication is indirectly affecting aquatic organisms by altering their environment. This brings on altered selective pressures and could thereby cause changes in the genetic composition of exposed populations. READ MORE