Essays about: "seal management"

Showing result 1 - 5 of 18 essays containing the words seal management.

  1. 1. Evaluation of photo-ID technique to estimate harbour seal numbers in Gullmarsfjorden, Sweden

    University essay from Göteborgs universitet / Instiutionen för biologi och miljövetenskap

    Author : Simon Isaksson; [2022-10-26]
    Keywords : ;

    Abstract : To be able to preserve areas in nature in a careful way a good understanding of the biodiversity living there is needed. The harbour seals are a top predator that affect and is affected by the whole food chain and plays a vital role in the ecosystem. READ MORE

  3. 2. Development of northern pike (Esox lucius) populations in the Baltic Sea, and potential effects of grey seal (Halichoerus grypus) predation

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Rebecka Svensson; [2021]
    Keywords : diet analysis; ; marine mammals; predator-prey; socio-economic; sport fishing; recreational fisheries;

    Abstract : Worldwide, marine mammal populations are increasing after considerable efforts to turn the downward trends caused by hunting, accidental mortality and pollution. The ecosystem effects from the increases of these top predators may be pronounced, but are in most cases poorly known. READ MORE

  4. 3. Implementation of native tree species in Rwandan forest plantations : recommendations for a sustainable sector

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

    Author : Roberto Enrico Stelstra; [2021]
    Keywords : silviculture; tropical; mixed plantations; indigenous species;

    Abstract : The forest plantations in Rwanda have been dominated by monocultures of exotic species, primarily Eucalyptus and Pinus, for the last 100 years. This type of monoculture leaves the forests vulnerable to disturbances like pests and droughts, and has a negative impact on the species biodiversity in the Rwandan forests. READ MORE

  5. 4. Seal Predation Costs on the Vendace Fishery in the Bothnian Bay : A partial bioeconomic analysis of the economic costs inflicted upon the vendace fishery by seal predation

    University essay from Umeå universitet/Nationalekonomi

    Author : Simon Lindgren; [2019]
    Keywords : ;

    Abstract : This study examines the costs in terms of lost revenues inflicted upon the vendace fishing industry by increased seal predation in the Bothnian Bay between the years of 2008 and 2017. A partial bioeconomic model is used to estimate the costs of predation, where a constant stock management type is assumed. READ MORE

  6. 5. Användning av åtelkameror för att uppskatta antalet sälar i fjordarna innanför Orust : en metodutvärdering

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Daniel Carlsson; [2019]
    Keywords : knubbsäl; Phoca Vitulina; 8-fjordar; EBFM; åtelkamera; time-lapse;

    Abstract : I slutet av 1980-talet blev många fiskbestånd på svenska västkusten överfiskade vilket bl.a. resulterade i en minskning av kustnära bestånd av olika torskfiskarter. READ MORE