magistrsko delo
Povzetek
Zlatooki obadi (Chrysops sp.) se v veliki meri zanašajo na vid. Samice ga uporabljajo
predvsem za iskanje plena in iskanje vodnih teles, ki jih potrebujejo za
razmnoževanje. Vid poddružine Chrysopsinae še ni podrobno raziskan, zato smo ga
analizirali z mikroskopskimi in elektrofiziološkimi tehnikami. Mrežnica zlatookih
obadov je občutljiva pretežno na modro svetlobo in ne na zeleno, kot je pogosto pri
mlajših taksonomskih skupinah iz družine obadov (fam. Tabanidae). Pri perifernih
fotoreceptorjih je bila polarizacijska občutljivost redka, opazili pa smo jo pri
centralnem fotoreceptorju, zato sklepamo, da je vloga prvih zaznava gibanja in
slednjih polarizacije svetlobe. Fluorescenca fotoreceptorjev kaže, da v mrežnici
najdemo dva tipa omatidijev – pale in yellow. Ta dva tipa sovpadata z orientacijo
rabdomer R7, ki so pri pale receptorjih vodoravne, pri yellow pa navpične (vzporedne
z dorzoventralno osjo oči). Oba tipa omatidijev sta naključno razporejena po
mrežnici. Kornea zlatookih obadov je značilne kovinsko zelene barve s temnimi
lisami. Predpostavljali smo, da njena obarvanost vpliva na zaznavo svetlobe, a smo
to hipotezo ovrgli, saj tovrstnega vpliva nismo uspeli zaznati z elektrofiziološkimi
meritvami. Prav tako obarvanost kornee ni povezana s celično sestavo mrežnice, saj
sta oba tipa omatidijev razporejena neodvisno od barve kornee. Obarvana kornea
torej nima optične vloge, ni povezana z ustrojem mrežnice, in ima verjetno signalno
vlogo pri vidni komunikaciji.
Ključne besede
Chrysops sp.;zlatooki obad;fiziologija obada;sestavljene oči;omatidij;zoologija;biologija;magistrska dela;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2022 |
Tipologija: |
2.09 - Magistrsko delo |
Organizacija: |
UL BF - Biotehniška fakulteta |
Založnik: |
[T. Lončar] |
UDK: |
591 |
COBISS: |
120278531
|
Št. ogledov: |
62 |
Št. prenosov: |
11 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Physiological and anatomical properties of deerfly retina |
Sekundarni povzetek: |
Deerflies (Chrysops sp). strongly rely on vision. Females use it primarily to search
for prey and water bodies they need for reproduction. The species of the Chrysopsinae
subfamily have not yet been studied in detail, so we analysed it with microscopic and
electrophysiological techniques. The retina of deerflies is sensitive mainly to blue light and
not to green, as is often the case with younger taxonomic groups from the horsefly family
(fam. Tabanidae). Polarization sensitivity was rare in peripheral photoreceptors, but was
observed in the central photoreceptor, so we conclude that the role of the former is the
perception of motion and the latter the polarization of light. Fluorescence of photoreceptors
indicates that two types of ommatidia are found in the retina – pale and yellow. These
two types coincide with the orientation of rhabdomere R7, which is horizontal in the pale
ommatidial type and vertical (parallel to the dorsoventral eye axis)in yellow. Both types of
ommatidia are arranged stochastically in retina. The cornea of deerflies is of characteristic
metallic green colour with dark spots. We assumed that its coloration affects the detection
of light, but we refuted this hypothesis, as we were unable to detect such an effect with
electrophysiological measurements. Also, corneal staining is not related to the cellular
composition of the retina, as both types of ommatidia are distributed irrespective of the
corneal colour. The stained cornea therefore has no optical role, is not related to the structure
of the retina, and probably has a signalling role in visual communication. |
Sekundarne ključne besede: |
deerfly;physiology;compound eyes;ommatidium;zoology;biology;master thesis;Fiziologija;Univerzitetna in visokošolska dela; |
Vrsta dela (COBISS): |
Magistrsko delo/naloga |
Študijski program: |
0 |
Konec prepovedi (OpenAIRE): |
1970-01-01 |
Komentar na gradivo: |
Univ. v Ljubljani, Biotehniška fak., Oddelek za biologijo |
Strani: |
X, 45 f., [1] f. pril. |
ID: |
15980944 |