Magnetna poravnava sviloprejk med prehranjevanjem : diplomsko delo

Irgolič, Tjaša

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Title:	Magnetna poravnava sviloprejk med prehranjevanjem : diplomsko delo
Authors:	ID Irgolič, Tjaša (Author) ID Skok, Janko (Mentor) More about this mentor... ID Urbanek Krajnc, Andreja (Comentor)
Files:	VS_Irgolic_Tjasa_2025.pdf (1001,76 KB) MD5: 4B3C1AB4246345A5BFB4507FCABA164F
Language:	Slovenian
Work type:	Bachelor thesis/paper
Typology:	2.11 - Undergraduate Thesis
Organization:	FKBV - Faculty of Agriculture and Life Sciences
Abstract:	Sviloprejke (Bombyx mori L.) so nočni metulji, katerih ličinke že tisočletja vzgajajo za pridelavo svile. Na njihovo vedenje in razvoj vplivajo mnogi okoljski dejavniki, kot so svetloba, temperatura in vlaga. Poleg teh, utegnejo imeti na sviloprejke vpliv tudi diskretnejši dejavniki, kot je geomagnetizem. Geomagnetne silnice namreč povzročajo pojav magnetne poravnave, ki je opredeljena kot usmerjanje telesa živali glede na geomagnetno polje, običajno vzporedno z magnetnimi silnicami (S–J) ali pravokotno nanje (V–Z). Pojav je bil potrjen že pri mnogih živalskih vrstah, pri sviloprejkah pa še ni bil preučevan, čeprav utegne predstavljati pomembno informacijo za svilogojce. V raziskavi smo zato želeli preveriti, ali sviloprejke med hranjenjem kažejo znake magnetne poravnave. V raziskavo je bilo vključenih 100 gosenic sviloprejke v fazi po tretji levitvi , razdeljenih v štiri skupine po 25 živali. Njihov položaj smo s pomočjo kamer opazovali trikrat dnevno, vsakih šest ur, s prvim jutranjim opazovanjem ob 7:00. Rezultati so pokazali, da so se sviloprejke po tretji levitvi v prvih petih dneh eksperimenta (dan < 5) kazale značilno poravnavo v smeri sever–jug (p ≤ 0,05) ta je bila najbolj opazna v jutranjem in popoldanskem času. V večernem času magnetne poravnave ni bilo zaznati (p ≥ 0,05). Prav tako po petem dnevu (dan > 5) in po četrti levitvi, ko so začele iskati primeren prostor za zapredanje kokonov, magnetne poravnave nismo več zaznali (p ≥ 0,05). Ugotovili smo, da sviloprejke izkazujejo magnetno poravnavo, vendar je ta časovno omejena tako na del dneva kot tudi na obdobje v fazi razvoja, tj. pred začetkom faze zapredanja. Razumevanje vpliva geomagnetizma in upoštevanje naravnih vzorcev orientacije sviloprejk, kot je magnetna poravnava, lahko prispevajo k učinkovitejšemu hranjenju in posledično boljši rasti ličink sviloprejk.
Keywords:	bela murva, Bombyx mori L., magnetna poravnava, Morus alba L., sviloprejka
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	T. Irgolič
Year of publishing:	2025
Number of pages:	1 spletni vir (1 datoteka PDF (V, 28, [2] str.))
PID:	20.500.12556/DKUM-94652
UDC:	638.22:638.232(043.2)=163.6
COBISS.SI-ID:	253083139
Publication date in DKUM:	14.10.2025
Views:	150
Downloads:	31
Metadata:
Categories:	FKBV
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Licences

License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:	24.08.2025

Secondary language

Language:	English
Title:	Magnetic alignment of Silkworms During Feeding
Abstract:	The silkworm (Bombyx mori L.) is a nocturnal moth whose larvae have been bred for centuries for silk production. Their behaviour and development are influenced by a variety of environmental factors, including light, temperature and humidity. Furthermore, other less obvious factors, including geomagnetism, may also have an impact. The geomagnetic field can cause a phenomenon known as magnetic alignment. This is defined as the orientation of an animal’s body in relation to the Earth’s magnetic field. Typically, this orientation is either parallel (N–S) or perpendicular (E–W) to the magnetic field lines. This phenomenon has been observed in many animal species, but not yet in silkworms, despite the fact that it could provide sericulturists with important information. The aim of this study was to determine whether silkworms exhibit magnetic alignment behaviour while feeding. A total of 100 silkworm larvae at the third instar stage were divided into four groups of 25 for the experiment. Their body orientation was observed using cameras three times a day at six-hourly intervals, starting at 7:00 am. The results showed a magnetic alignment in the first five days after the third moult (day < 5), during which time a significant north–south orientation was observed (p < 0.05), most notably in the morning and afternoon. However, no magnetic alignment was detected in the evening (p ≥ 0.05). Similarly, after day five (day > 5), when the larvae started searching for a suitable place to spin their cocoons, the magnetic alignment was no longer observed (p ≥ 0.05). We concluded that, although the silkworms exhibit magnetic alignment, this is temporally restricted to specific times of day and periods of development, i.e., before they begin spinning their cocoons. The feeding and growth of silkworm larvae could be improved by taking into account the natural orientation patterns of silkworms, such as magnetic alignment, and understanding the influence of geomagnetism.
Keywords:	Bombyx mori L. magnetic alignment, Morus alba L., silkworm, white mulberry

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