TROFICKÁ NIKA MYRMEKOFÁGNÍCH PAVOUKŮ Bakalářská Práce Magdalena Neradilová

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TROFICKÁ NIKA MYRMEKOFÁGNÍCH PAVOUKŮ Bakalářská Práce Magdalena Neradilová MASARYKOVA UNIVERZITA PŘÍRODOVĚDECKÁ FAKULTA ÚSTAV BOTANIKY A ZOOLOGIE TROFICKÁ NIKA MYRMEKOFÁGNÍCH PAVOUKŮ Bakalářská práce Magdalena Neradilová Vedoucí práce: prof. Mgr. Stanislav Pekár, PhD. Brno 2014 Bibliografický záznam Autor: Magdalena Neradilová Přírodovědecká fakulta, Masarykova univerzita Ústav botaniky a zoologie Název práce: Trofická nika myrmekofágních pavouků Studijní program: Biologie Studijní obor: Systematická biologie a ekologie Vedoucí práce: prof. Mgr. Stanislav Pekár, PhD. Akademický rok: 2012/2014 Počet stran: 87 Klíčová slova: Trofická nika, myrmekofágie, myrmekofágní pavouci, potravní specialista, Theridiidae, Euryopis episinoides, predace, preference, preferenční chování Bibliographic Entry Author: Magdalena Neradilová Faculty of Science, Masaryk University Department of Botany and Zoology Title of Thesis: Trophic niche of myrmecophagic spiders Degree Programme: Biology Field of Study: Systematic biology and ecology Supervisor: prof. Mgr. Stanislav Pekár, PhD. Academic Year: 2012/214 Number of Pages: 87 Keywords: Trophic niche, myrmekophagy, ant-eating spiders, food specialist, Theridiidae, Euryopis episinoides, predation, preferences, prey-choice behavior ABSTRAKT Tato bakalářská práce zahrnuje část teoretickou a část praktickou. V teoretické části bylo cílem uskutečnit literární rešerši trofické niky myrmekofágních pavouků. Praktická část byla zaměřena na pavouka Euryopis episinoides a na jeho potravní specializaci. Aktuální kořist byla zjištěna na základě analýzy zámotků obsahující zbytky kořistí. Výsledek odhalil jeho úplnou specializaci na lov mravenců. Experiment pro zjištění šířky spektra kořisti E. episinoides probíhal v laboratorních podmínkách. Postupně byla tomuto druhu nabídnuta kořist v podobě mravenců dvou čeledí a následně i devět zástupců jiných arthropod. Provedenými experimenty bylo dokázáno, ţe E. episinoides není potravní specialista zaměřený na lov jednoho typu kořisti (předpoklad na základě analýzy výše uvedených zámotků), ale je schopen lovit v širším spektru kořisti. Největší úspěšnost byla zaznamenána při lovu mravenců, termitů a ovocných mušek. Během experimentu byly pozorovány také chování, fáze lovu a reakce E. episinoides na různý typ kořisti. ABSTRACT This thesis includes a theoretical part and a practical part. The theoretical part aimed to make a literature research of the trophic niche of the myrmekophagous spiders. The practical part was focused on a species called Euryopis episinoides and its foraging specialization. The actual prey was found based on the analysis of cocoons containing residues of the prey. The result revealed its full specialization in hunting ants. The experiment to determine the range of the E. episinoides’s prey was conducted in the laboratory conditions. A prey was offered to this species in the form of two families of ants and subsequently nine representatives of other arthropods. The performed experiments confirmed that E. episinoides is not a monophagic focused only on one type of hunting prey (assumption based on the analysis of the cocoons, as stated above) but it can hunt in a wider range of prey. The biggest success was recorded when hunting ants, termites and fruit flies. During the experiment, the behavior in hunting and theresponse to various types of prey of E. episinoides were also observed. PODĚKOVÁNÍ V první řadě bych ráda poděkovala prof. Mgr. Stanu Pekárovi PhD. za ispirativní přístup, ochotu, trpělivé vedení a pomoc při analýze přirozené kořisti. Mgr. Lence Sentenské a Mgr. Evě Líznarové děkuji za ochotu a trpělivost při odpovídání nebo řešení mých, ne vţdy jednoduchých dotazů. Dále Miroslavu Vaverkovi za poskytnutou potenciání kořist pro experiment a Mgr. Jiřímu Procházkovi za ujasnění statistických nesrovnalostí. Svým rodičům bych chtěla poděkovat za podporu při studiu a za poskytnuté zázemí. A v neposlední řadě děkuji mým spoluţákům a kolegům z laboratoře za pozitivní přístup a ochotu pomoci. Prohlášení Prohlašuji, ţe jsem svoji bakalářskou práci vypracovala samostatně s vyuţitím informačních zdrojů, které jsou v práci citovány. V Brně 8. ledna 2014 . Jméno a přímení Úvod Má bakalářská práce se zabývá myrmekofágními organismy hlavně pavouky a jejich trofickou nikou. Práce obsahuje dvě části, teoretickou a praktickou. Podstatou teoretické části bylo provedení literární rešerše organismů specializujících se na lov určitého typu kořisti (v našem případě na lov mravenců). Cílem praktické části bylo zjištění spektra aktuální kořisti v přirozeném prostředí u vybraného druhu pavouka. Následným úkolem bylo na základě experimentu v laboratorních podmínkách zjistit, jak široké spektrum kořisti bude námi zvolený pavouk lovit v rámci nabízené potenciální kořisti. V neposlední řadě bylo pozorováno chování a lovecká technika vybraného druhu pavouka pro jednotlivé typy kořisti. OBSAH TEORETICKÁ ČÁST 1 Ekologická nika ...................................................................................................... 11 1.1 Historie ekologické niky .................................................................................. 11 1.2 Teorie ekologické niky ..................................................................................... 12 1.3 Ekologická valence .......................................................................................... 12 1.4 Trofická (potravní) nika ................................................................................... 13 2 Myrmekofágie ......................................................................................................... 16 2.1 Charakteristika skupiny Formicidae a Isoptera ................................................ 17 2.2 Aktuální, potencionální kořist a parasitismus .................................................. 18 2.3 Preference kořisti ............................................................................................. 21 2.3.1 Preference jednotlivých mravenčích druhů .............................................. 21 2.3.2 Preference podle velikosti kořisti ............................................................. 24 2.3.3 Různá vývojová stádia u myrmekofágie ................................................... 25 2.4 Vliv okolních podmínek na myrmekofágii ...................................................... 26 2.5 Vliv stavu predátora ......................................................................................... 28 2.6 Adaptace v rámci myrmekofágie ..................................................................... 28 2.7 Další příklady myrmekofágie u obratlovců ...................................................... 33 2.7.1 Ţáby .......................................................................................................... 33 2.7.2 Hadi a slepýši ............................................................................................ 37 2.7.3 Ještěrky ..................................................................................................... 37 2.7.4 Ptáci .......................................................................................................... 39 2.7.5 Savci .......................................................................................................... 39 2.8 Další příklady myrmekofágie u bezobratlých .................................................. 40 2.8.1 Charakteristika skupiny Araneae .............................................................. 41 2.8.2 Široké spektrum kořisti ............................................................................. 42 2.8.3 Specialisté ................................................................................................. 42 PRAKTICKÁ ČÁST 3 Cíle práce ................................................................................................................ 44 4 Experiment .............................................................................................................. 46 4.1 Materiál a metodika .......................................................................................... 46 5 Výsledky ................................................................................................................. 49 5.1 Analýza přirozené kořisti ................................................................................. 49 5.2 Porovnání lovu kořisti ...................................................................................... 50 5.3 Analýza lovu .................................................................................................... 55 5.3.1 Části lovu .................................................................................................. 55 5.3.2 Taktika lovu různých typů kořisti ............................................................. 57 5.3.3 Doba trvání jednotlivých částí lovu změnit číslování u tabulek ............... 62 9 6 Diskuse .................................................................................................................... 68 7 Závěr ....................................................................................................................... 72 8 LITERATURA ....................................................................................................... 73 TEORETICKÁ ČÁST 1 Ekologická nika Nika má své uplatnění v nejednom vědním oboru. Pro naše účely se budeme zabývat nikou ekologickou, která je spjata s konkrétním biologickým druhem, který tuto niku vytváří. Jedná se o prostorové a funkční zařazení organismu do ekosystému, nebo způsob, jakým je organismus zapojen do jeho fungování (BEGON et al. 2005). Nejčastěji
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