Repository logo
 
Publication

The effect of temperature and substrates on polyp settlement of the spotted tellyfish, phyllorhiza punctata (Von Lendenfeld, 1884)

datacite.subject.fosEngenharia e Tecnologia::Outras Engenharias e Tecnologiaspt_PT
dc.contributor.advisorMarques, Sónia Cristina Ferreira Cotrim
dc.contributor.advisorLeandro, Sérgio Miguel Franco Martins
dc.contributor.authorPinto, Carlos Daniel Carvalho
dc.date.accessioned2021-09-15T09:08:06Z
dc.date.available2021-09-15T09:08:06Z
dc.date.issued2021-07-28
dc.description.abstractIn recent decades, human activity has been known to influence Earth’s marine ecosystems in a multitude of different ways, such as through global warming, overfishing, coastal or marine construction, pollution, among others. These impacts will then produce different effects on the affected organism populations. One of these groups is the gelatinous one, which has gained a lot of scientific interest due to the increased frequency and abundance jellyfish populations worldwide. It is speculated that human activities may have an impact on the development and reproduction of these species. Therefore, the aim of this work was to evaluate the effect of temperature, and different substrates on the asexual reproduction and polyp settlement of the jellyfish species Phyllorhiza punctata (Von Lendenfeld, 1884). Polyps of P. punctata were subjected to two different experiments. In the first experiment, the polyps were exposed to four different temperatures (22, 24, 26, and 28 ºC), and provided with five different substrate types (glass, rock, shell, plastic (PVC), and fishing net). After 60 days, the total number of polyps for each substrate and temperature was observed. In the second experiment, a different group of polyps was exposed to the same five substrates at the temperature of 24 ºC, and after 60 days, the total number of polyps, and their preferred distribution were compared. The results showed significant differences between the temperatures of 22 and 26 ºC, showing that higher temperatures have a positive effect on polyp asexual reproduction. It was also verified that a lower number of polyps was obtained at 28 ºC when compared with to 26 ºC, which indicates that this temperature may be outside the optimal range for P. punctata polyps, and therefore might restrict polyp reproduction instead. This leads us to believe that slight warming may benefit polyp asexual reproduction of P. punctata, but only within the limits supported by the species. Furthermore, polyp settlement occurred in all the provided substrates, although significant differences were observed between the plastic and the glass, rock, and shell substrates, being the later three significantly preferred over the first one. It was also possible to perceive a higher preference by the polyps to positions further away from the bottom of the goblet (negative geotaxis). In conclusion, marine-bound human activities appear to influence gelatinous organisms, and as such, further studies are required to better understand their influence on these organisms.pt_PT
dc.identifier.tid202764699pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.8/6230
dc.language.isoengpt_PT
dc.relationUIDB/Multi/0492/2020pt_PT
dc.relationFEDER, POCI-01-0145-FEDER-016772pt_PT
dc.subjectScyphozoapt_PT
dc.subjectWarmingpt_PT
dc.subjectSubstrate selectivitypt_PT
dc.subjectBenthic life stagept_PT
dc.titleThe effect of temperature and substrates on polyp settlement of the spotted tellyfish, phyllorhiza punctata (Von Lendenfeld, 1884)pt_PT
dc.typemaster thesis
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FMAR-BIO%2F0440%2F2014/PT
oaire.fundingStream9471 - RIDTI
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typemasterThesispt_PT
relation.isProjectOfPublicationa34509df-2a08-42f3-accd-d01428bef8e6
relation.isProjectOfPublication.latestForDiscoverya34509df-2a08-42f3-accd-d01428bef8e6
thesis.degree.nameMestrado em Aquaculturapt_PT

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Tese+Carlos+Pinto.pdf
Size:
2.51 MB
Format:
Adobe Portable Document Format
Description: