Ponašanje hridinskog ježinca (Paracentrotus lividus) u prisustvu znakova predatorstva

master's thesis

• Title (english): Behavior of purple sea urchin (Paracentrotus lividus) under the influence of predation cues
• Author: Paula Prpić
• Mentor: Petar Kružić (mentor)
• Committee member: Kristina Pikelj (predsjednik povjerenstva)
• Committee member: Petar Kružić (član povjerenstva)
• Committee member: Ivana Maguire (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Committee member: Nenad Buzjak (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2022-02-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Hridinski ježinac, Paracentrotus lividus (Lamarck, 1816) jedna je od najčešćih vrsti ježinaca u
Jadranskom moru i bitan dio ekosustava sublitorala. Dijeli životni prostor s mnogim predatorskim
vrstama. Cilj istraživanja bio je ispitati kretanje i obrasce ponašanja hridinskog ježinca pod
utjecajem predatorstva. Istraživanje je provedeno na otoku Silbi početkom listopada. Jedinke su
bile podijeljene u tri skupine: dvije pokusne i kontrolnu. Prvoj pokusnoj skupini dodavana je voda
iz akvarija s predatorom, kvrgavom zvjezdačom, Marthasterias glacialis (Linnaeus, 1758), a
drugoj voda iz akvarija s razbijenim hridinskim ježincem, na način kako ga razbiju predatorske
ribe. Utvrđene su razlike u kretanju i ponašanju među pokusnim skupinama, ali i naspram
kontrolne. Skupina kojoj je dodavana voda s kemijskim signalima razbijenog ježinca najviše se
kretala, ali najbrže se krenula kretati druga pokusna skupina prilikom drugog dodavanja vode s
kemijskim signalom zvjezdače. Kod ponašanja je utvrđeno nekoliko karakterističnih obrazaca:
pomicanje bodlji i ambulakralnih nožica, kretanje po dnu, stijenkama akvarija i kamenju, skrivanje
u kamenju i mirovanje. Obrasci su različito zastupljeni među skupinama, ali ukazuju na zaključak
da dodavanje kemijskih signala razbijene jedinke iste vrste stvara ježincima jači stres nego kemijski
signali zvjezdače.

Abstract (english)

The purple sea urchin, Paracentrotus lividus (Lamarck, 1816), is one of the most common sea
urchin species in the Adriatic Sea. It has an important role in sublittoral ecosystems. It shares its
habitat with many different predators. The aim of this thesis was to test movement and behaviour
under predation stimuli. The experiment was done on Silba Island in October. Individuals were
divided into three groups: two experimental and a control. The first experimental group was
exposed to chemical signals from a spiny starfish, Marthasterias glacialis (Linnaeus, 1758). The
second group was treated with chemical signals from a shattered conspecific individual. It was
shattered like after a predatory fish attack. Differences were observed between both experimental
groups and compared to the control. The group treated with chemical signals from shattered
individuals moved the most, but the starfish-treated group was the quickest to move after the second
exposure. Some characteristic behaviour patterns were spine or ambulacral legs movement, moving
along the bottom, along aquarium walls or rocks, hiding within rocks and staying motionless.
Patterns are differently distributed among groups, but it’s indicated that chemical signals from
shattered individuals cause more stress among sea urchins than chemical signals from spiny
starfish.

• Keywords: odnos plijen-predator; kemijski signali; Jadransko more; predatorske ribe; kvrgava zvjezdača; ponašanje životinja; akvarij
• Keywords (english): predator-prey relationship; chemical signals; Adriatic Sea; predator fish; spiny starfish; animal behaviour; aquarium
• Language: croatian
• URN:NBN: urn:nbn:hr:217:030351
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-03-23 11:54:56