Essays about: "Gasterosteus aculeatus"

Showing result 1 - 5 of 8 essays containing the words Gasterosteus aculeatus.

  1. 1. Behavioral Alteration of Ninespine Stickleback (Pungitius pungitius) and Threespined Stickleback (Gasterosteus aculeatus) when Exposed to the Anxiolytic Drug Oxazepam.

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

    Author : Jenni Burman; [2020]
    Keywords : Behavioral alteration; oxazepam; Pungitus pungitus; Gasterosteus aculeatus;

    Abstract : One of the environmental hazards the aquatic ecosystem is faced with today is pollution by pharmaceuticals that enter the aquatic system through wastewater from hospitals, manufacturing processes and improper disposal by the public. Benzodiazepines are a class of anxiolytic pharmaceuticals that have been shown to have behavioral modifying effects on exposed biota. READ MORE

  2. 2. Stickleback diets in bays along the northen Baltic Sea

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

    Author : Douglas Skarp; [2019]
    Keywords : stickleback; perch larvae; predation; competition; bay;

    Abstract : Coastal populations of perch (Perca fluviatilis) in the Baltic Sea has declined substantially the last decades while the populations of three-spined sticklebacks (Gasterosteus aculeatus) has increased rapidly during the same time period. Earlier studies have suggested that predation on perch larvae and or competition from sticklebacks are the causes behind the decline in perch. READ MORE

  3. 3. 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

  4. 4. 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

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

    University essay from Umeå universitet/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