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You searched for subject:(bevarande ekologi). Showing records 1 – 2 of 2 total matches.

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1. Schaerström, Fredrik. Icke-fysiska fiskledare : En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring.

Degree: Ecology and Environmental Sciences, 2017, Umeå University

Fiskars passager genom vattenkraftverk är förenat med hög dödlighet. För att minska vattenkraftens påverkan på fiskbestånd har olika fiskledare utvecklats. I denna laboratoriestudie utvärderades tre typer av icke-fysiska fiskledare och deras effektivitet i att leda odlade smolt av Atlantlax (Salmo salar L.) till en önskad passage. Målet med denna studie var att undersöka om det var möjligt att leda odlade laxsmolt till en önskad passage med hjälp av bubblor, strobeljus eller en kombination av bubblor och strobeljus. Med relativt enkla medel och låg kostnad konstruerades fiskledare som bestod av en perforerad slang driven av en luftkompressor samt en ljusramp med fyra LED-lampor vilka blinkade simultant med 480 bpm. Fem replikat genomfördes för vardera behandling, bubblor, strobeljus och bubblor/strobeljus, samt sex replikat i kontrollen. Under en timmes behandling fick tio laxsmolt, märkta med PIT-tag, passera en av två antenner, varav den ena var utrustad med en fiskledare, under vandring i nedströms riktning i ett strömakvarium. Denna studie visade att fiskledare av samtliga tre metoder ledde smolt till en önskad passage under behandlingens första femton minuter. Vidare visade fiskledaren bestående av bubblor en fortsatt ledande förmåga över hela behandlingsperioden (60 minuter), medan fiskledarna av strobeljus- och bubbel/strobeljus inte visade en sådan effekt.

Passages by fish through hydropower plants are associated with high mortality. In order to reduce the impact of hydropower plants on fish stocks, a variety of fish guiding systems have evolved. In this laboratory study, three types of non-physical fish guiding systems were evaluated by their efficiency in leading cultivated smolt of Atlantic salmon (Salmo salar L.) to a desired passage. This study aimed to answer if it is possible to guide salmon smolt to a desired safe passage by using bubbles, strobe light or a combination of bubbles and strobe light. With relatively simple means and low cost, fish-guides were constructed consisting of a perforated tube driven by an air compressor and a light ramp with four LED lights, which simultaneously flashed at 480 bpm. Five replicates were performed for each treatment; bubbles, strobe light and bubbles / strobe light, as well as six replicates for the controls. During one hour of treatment, ten salmon smolt, marked with PIT tag, could pass one of two antennas, where one had a fish-guide in front of the antenna, while migrating downstream in a stream aquarium. This study showed that fish-guides of all three methods led smolt to a desired passage during the first fifteen minutes of treatment. Furthermore, the bubble method showed a continuous guiding capacity throughout the treatment period (60 minutes), while the strobe light and bubble/strobe light did not show such an effect.

Subjects/Keywords: Fish guiding; Atlantic salmon; Salmo salar L.; smolt; barrier; air; bubbles; strobe light; safe passage; population conservation; Fiskledare; Atlantlax; Salmo salar L.; smolt; barriär; luft; bubblor; strobeljus; omlöp; bevarande ekologi; Biological Sciences; Biologiska vetenskaper

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Schaerström, F. (2017). Icke-fysiska fiskledare : En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-140407

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Schaerström, Fredrik. “Icke-fysiska fiskledare : En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring.” 2017. Thesis, Umeå University. Accessed August 20, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-140407.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Schaerström, Fredrik. “Icke-fysiska fiskledare : En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring.” 2017. Web. 20 Aug 2019.

Vancouver:

Schaerström F. Icke-fysiska fiskledare : En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring. [Internet] [Thesis]. Umeå University; 2017. [cited 2019 Aug 20]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-140407.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schaerström F. Icke-fysiska fiskledare : En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring. [Thesis]. Umeå University; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-140407

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Rindzevičius, Vytautas. Short-term effects of controlled conservation burning.

Degree: Biology Education Centre, 2014, Uppsala University

In this study, the immediate and short term (three months) effects of conservation burning have been investigated in coniferous forests in southeastern Sweden. Five tree species were investigated Picea abies (Norway spruce), Pinus sylvestris (Scots pine), Populus tremula (aspen), Betula pendula (silver birch) and Betula pubescens (downy birch), as well as ground vegetation of mosses, dwarf shrubs and ground lichens. Burning increased the proportion of live deciduous tree shoots from 51 % to 81 % and the live tree shoot size distribution of four tree species was significantly changed by fire. Fire affected the tree species differently. Three months after burning deciduous tree species exhibited strong sprouting, while P. sylvestris had established many seedlings, significantly increasing its share of the tree stand. P. abies lacked any visible positive response to burning and its number of live shoots decreased by 83 %. Mineral soil was exposed on only the moss vegetation and covered just 4 % of the studied plot area. The initial vegetation response to fire was negative, but significant dwarf shrub recovery was detected three months after burning.

Subjects/Keywords: forest; forest fire; burning; nature conservation; conservation; Sweden; fenoscandia; Norway spruce; Scots pine; aspen; Picea abies; Pinus sylvestris; Populus tremula; Betula; vegetation; trees; tree shoots; follow-up; followup; boreal; boreal forest; ekology; skog; skogsbrand; brand; bränning; naturvård; bevarande; Sverige; fenoscandia; gran; tall; asp; Picea abies; Pinus sylvestris; Populus tremula; Betula; vegitation; träd; trädskott; trä skott; upfäljning; followup; boreal; boreal skog; ekologi

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Rindzevičius, V. (2014). Short-term effects of controlled conservation burning. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234965

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Rindzevičius, Vytautas. “Short-term effects of controlled conservation burning.” 2014. Thesis, Uppsala University. Accessed August 20, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234965.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Rindzevičius, Vytautas. “Short-term effects of controlled conservation burning.” 2014. Web. 20 Aug 2019.

Vancouver:

Rindzevičius V. Short-term effects of controlled conservation burning. [Internet] [Thesis]. Uppsala University; 2014. [cited 2019 Aug 20]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234965.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rindzevičius V. Short-term effects of controlled conservation burning. [Thesis]. Uppsala University; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234965

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.