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Halogen och LED påverkar tillväxt och fotosyntetisk aktivitet olika hos manetarten Cassiopeia sp.
Karlstad University.
2017 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Cassiopeia sp huserar symbionter av typen zooxanthellaealger i sin vävnad som förser sin värd med fotosyntetiska produkter vilka bland annat nyttjas för tillväxt. I denna studie undersökte vi om lamptyper av LED och halogen i två intensiteter influerar den fotosyntetiska aktiviteten olika hos dessa symbionter, och om tillväxtskillnader hos maneterna kunde utrönas beroende av lamtyp. Experimentet var igång under 4 veckor och resultaten visade större tillväxt i halogengrupperna i båda intensitetsklasser. Fosfatreduktion i det omgivande vattnet samt syreproduktion användes som mått på den fotosyntetiska aktiviteten där syreproduktion var högre i båda halogengrupperna. Fosfatreduktion gav inga signifikanta resultat beroende av lamptyp utan berodde enbart på intensitet, dock kan man skönja skillnader med högre förbrukning av fosfat i halogengrupperna. Överlag visar studien att det eventuellt finns en skillnad mellan lamptyperna där halogen resulterar i högre fotosyntetisk aktivitet hos symbionterna än hos LED- grupperna, vilket leder till större tillväxt.

Abstract [en]

The jellyfish, Cassiopeia sp, maintain zooxanthellae symbionts in their tissue, which provide the jellyfish with photosynthetic products that are used for growth. In this study I investigated how halogen and LED lamps at two intensities influence the photosynthetic activity of these symbionts differently, and if growth differences between the jellyfishes were affected by lamp type. The experiment was running for 4 weeks and the results showed greater growth in the halogen groups at both intensity classes. Phosphate reduction in the surrounding water and oxygen production was used as a measure of photosynthetic activity, where oxygen production was higher in both groups of halogen compared to the LED groups. The phosphate test of the jellyfishes ambient water showed no significant differens depending on halogen and LED, but was depended on light intensity, where the individuals in the higher intensity classes assimilated greater amounts of phosphate. Overall, the study shows a difference between the lamp types where halogen results in greater photosynthetic activity by the symbionts than in the LED groups, which leads to greater growth measured as bell diameter. 

Place, publisher, year, edition, pages
2017. , 9 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:kau:diva-55405OAI: oai:DiVA.org:kau-55405DiVA: diva2:1114932
External cooperation
Aquaria vattenmuseum, Stockholm
Subject / course
Biology
Presentation
2017-06-14, Karlstad, 09:00 (Swedish)
Supervisors
Examiners
Available from: 2017-08-24 Created: 2017-06-26 Last updated: 2017-08-24Bibliographically approved

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