Evolucija pera

undergraduate thesis

• Title (english): Evolution of the feather
• Author: Lucian Domitrović
• Mentor: Damjan Franjević (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2023-07-06, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Pero je najbolje definirana karakteristika ptica. Dugo vremena se mislilo da je pero
koevoluiralo s evolucijom ptica, ali nedavna otkrića su dovela ovo mišljenje pod povećalo. Čini se
da je pero zapravo bila karakteristika koju je dijelila većina, ako ne i sve grupe dinosaura. Nova
otkrića perja u pterosaura koja su, čini se, homologna onima u ptica, pomiče evoluciju pera još
dalje u prošlost do zajedničkog pretka grupe Avemetatarsalia. To omogućuje rekonstrukciju
upotpunjenijeg filogenetskog stabla evolucije pera temeljenog na tipovima pera koja nisu prisutna
u modernim ptičjim vrstama. Istraživanja su upotpunjena novim saznanjima u razvojnoj biologiji
perja i drugih pokrovnih struktura kralježnjaka kao što su ljuske, dlake i riblje krljušti. Sve ovo
stvara temelje za hipotezu o ranom podrijetlu perja prema kojoj je pero evoluiralo u vrijeme
oporavka od masovnog izumiranja na kraju perma. Pero je u početku vjerojatno imalo ulogu u
izolaciji životinje od okolišnih čimbenika kao i ulogu u komunikaciji između jedinki. Pernate
životinje bi tako imale prednost nad ostalim kompetitivnim skupinama tog perioda kao što su
sinapsidi i drugi arkosauri.

Abstract (english)

Feather is the best-defined trait of birds. For a long time, it was thought that feather coevolved
with the evolution of birds, but recent discoveries have challenged this view. It now seems likely
that feathers were in fact shared across many, if not all dinosaurs. Recent discoveries of feathers
in pterosaurs, probably homological to those of birds, extends this view even further to the ancestor
of Avemetatarsalia. This makes it possible to reconstruct a more exhaustive phylogenetic tree of
the evolution of the feather according to different feather types that haven’t been found in modern
bird species. The research is complemented by studies in developmental biology of feathers and
other integumentary structures present in vertebrates such as scales, hairs and odontodes. This
makes a foundation for an early origin of feathers hypothesis that puts their emergence at the time
of recovery from the End-Permian mass extinction event. It seems likely that, initially, feathers
served a function of insulation and signaling and thus provided their carriers with an evolutionary
edge against other competitive groups of that period such as synapsids and other Archosarus.

• Keywords: Avemetatarsalia; biologija razvoja; evo-devo eksperimenti; morfologija pera; filogenetičke analize perja; perja u pterosaura
• Keywords (english): Avemetatarsalia; developmental biology; evo-devo experiments; feather morphology; phylogenetic analyses of feathers; pterosaur feathers
• Language: croatian
• URN:NBN: urn:nbn:hr:217:900793
• Study programme: Title: Molecular Biology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) molekularne biologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) molekularne biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-07-06 13:39:11