Reprodukcijska biologija invazivke Aster squamatus v slovenskem primorju

Veselič, Daniel

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Title:	Reprodukcijska biologija invazivke Aster squamatus v slovenskem primorju
Authors:	ID Veselič, Daniel (Author) ID Šajna, Nina (Mentor) More about this mentor... ID Ivajnšič, Danijel (Comentor)
Files:	UNI_Veselic_Daniel_2012.pdf (1,01 MB) MD5: AC8F22F815B52966B5C6159E711AD8A2 PID: 20.500.12556/dkum/c21f8cb7-cd58-48e9-8feb-d06e840cb83e
Language:	Slovenian
Work type:	Undergraduate thesis
Typology:	2.11 - Undergraduate Thesis
Organization:	FNM - Faculty of Natural Sciences and Mathematics
Abstract:	Rod Aster prvotno izhaja iz Severne in Južne Amerike. Vrste, ki pripadajo temu rodu so naturalizirane po vsem svetu, zlasti v slanih in vlažnih habitatih. Aster squamatus je hemikriptofit in izvira iz centralne Južne Amerike, a je razširjena v mnogih državah po svetu, med drugim tudi v Sloveniji. Leta 1973 je luskasto nebino pri nas prvi zabeležil in opisal Wraber. Vrsta je vse od takrat nenehno prisotna na slovenskem ozemlju. Čeprav pri nas zaenkrat še ni tako invazivna, pa je njena prisotnost moteča, še posebej v bližini dveh najpomembnejših obalnih mokrišč ob slovenski obali - v Sečoveljskih solinah in Škocjanskem zatoku, ki spadata v omrežje Natura 2000. Tema oziroma problematika pričujoče diplomske naloge temelji na raziskovanju reprodukcijskih zmožnosti obravnavane vrste A. squamatus in na korelaciji z njeno morebitno invazivnostjo na slovenskem območju. Raziskovanje je potekalo v dveh stopnjah. V prvem delu raziskave je bila izvedena dokumentacija rastišča, vzorčenje rastlinskih primerkov in tal. V drugem delu smo izvedli analizo prsti, zanimala pa nas je tudi stopnja kalivosti obravnavane vrste. Sledila je obdelava podatkov z rezultati in diskusija, v kateri prihajamo do ključne ugotovitve, da ima A. squamatus visok reprodukcijski potencial, ki se povečuje z višino rastline. Izračuni pokažejo, da rastline manjše od 110 cm "nosijo" od 700 do 8700 semen, medtem ko rastline višje od 110 cm proizvajajo vsaj petkrat več semen. Glede na rezultate vzorcev prsti pa lahko sklenemo, da količina vsebnosti nutrientov v prsti bistveno ne vpliva na razvoj in rast luskaste nebine. Kljub dejstvu, da vrsta zaenkrat še resneje ne ogroža naših avtohtonih vrst resneje pa bi bilo iz preventivnih razlogov zaželjeno, da bi se višje in večje rastline sproti odstranjevalo.
Keywords:	Aster squamatus, invazivna vrsta, reproduktivni potencial, analiza prsti, stopnja kalivosti
Place of publishing:	Maribor
Publisher:	[D. Veselič]
Year of publishing:	2012
PID:	20.500.12556/DKUM-38328
UDC:	57(043.2)
COBISS.SI-ID:	19419400
NUK URN:	URN:SI:UM:DK:F3AYVD82
Publication date in DKUM:	18.10.2012
Views:	2437
Downloads:	262
Metadata:
Categories:	FNM
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Secondary language

Language:	English
Title:	Reproductive biology of invasive species Aster squamatus in the Slovenian coastal habitats
Abstract:	The genus Aster is native to North and South America and species belonging to this genus are naturalized worldwide, especially in saline and humid habitats. Aster squamatus is a hemicryptophyte originating from central South America, but has spread to many countries around the world, including in Slovenia. The first record of A. squamatus in Slovenia was noted in 1973 by Wraber and the species is constantly present since then. Even though it is not invasive, where present, its occurrence is disturbing, especially, the occurrence near the two most important coastal wetlands along Slovenian coast – in Sečovlje salina and Škocjan inlet, representing various Natura 2000 habitats. Topic or issue of this thesis is based on research of reproductive capacity of the species A. squamatus and correlated with its potential invasiveness on Slovenian territory. Research was conducted in three stages. In the first part of the research we carried out the selection and documentation of the growing area as well as the sampling of plant specimens and soil. In the second part we carried out the analysis of soil and we tested seeds for germination rate in laboratory conditions. This was followed by data processing of results and discussion, in which we came to the key findings, that A. squamatus has a high reproductive potential, which increases with the height of the plant. Calculation show that plants smaller than 110 cm could bear from about 700 to 8.700 seeds while plants taller than 110 cm produce at least five times more seeds from about 47.000 to 70.000 seeds. According to the results of soil samples it can be concluded that the amount of nutrient content in the soil does not significantly affect the development and growth of A. squamatus. Despite the fact that A. squamatus for now does not threaten our native species more seriously, it would be desirable on a precautionary basis, higher plants should be removed from occupied habitats.
Keywords:	Aster squamatus, invasive species, reproductive potential, soil analysis, germination rate

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