Promjena boje tijela glavonožaca (Mollusca, Cephalopoda)

undergraduate thesis

• Title (english): Colour change in cephalopods (Mollusca, Cephalopoda)
• Author: Ana Dobrović
• Mentor: Jasna Lajtner (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2012, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Tjelesni uzorak glavonožaca izgrađen je od kromatskih, teksturalnih, posturalnih i lokomotornih komponenti. One su dalje sastavljene od jedinica, a jedinice sačinjavaju elementi – pigmentirani kromatofori, strukturne reflektirajuće stanice i kožni mišići. Zadivljujući optički efekti tjelesnih uzoraka i njihova brza promjena, omogućena je prvenstveno zahvaljujući živčano upravljanim kromatoforima. Unutar svakog kromatofora nalazi se citoelastična vrećica sa pigmentom, za koju su vezani setovi radijalnih mišića sa živcima. Ekspanziju i kontrakciju mišića kontroliraju hijerarhijski organizirani centri u mozgu. Na taj način glavonošci mogu u trenutku promijeniti tjelesni uzorak u svrhu prikrivanja ili komunikacije. Prikrivanje je značajna anti-predatorska taktika, i glavni razlog evolucije kromatofora, a postiže se stapanjem s pozadinom, različitom obojenosti dijelova tijela, prekinutim obojenjem ili nalikovanjem neživim objektima. Tjelesne uzorke glavonošci koriste i u komunikaciji s predatorima ili plijenom te za pronalazak partnera.

Abstract (english)

Body pattern in cephalopods consists of chromatic, textural, postural and locomotor components. They are made up of units, and a unit consists of elements – pigmented chromatophores, structural reflecting cells and skin muscles. Stunning optical effects of body patterns and their rapid changes is enabled primarily due to neurally controlled chromatophores. Within each chromatophore there is a cytoelastic sacculus with pigment, attached to a set of radial muscles, each with its nerves. Expansion and contraction of the muscles is controlled by a set of lobes in the brain organized hierarchically. In this way cephalopods can change their body pattern instantly for camouflage or to communicate. Camouflage is an important anti-predatory tactics, and the main reason of chromatophore evolution. It’s achieved by merging with the background, countershading, disruptive coloration and deceptive resemblance. Cephalopods also use their body patterns to communicate with predators and prey, and to find partners.

• Keywords: glavonošci; promjena boje tijela; tjelesni uzorak; prikrivanje
• Keywords (english): cephalopods; colour change; body pattern; camouflage
• Language: croatian
• URN:NBN: urn:nbn:hr:217:789806
• Study programme: Title: Environmental Sciences; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-04-16 08:38:15