Sekundarna produkcija ličinki porodice Hydropsychidae (Insecta: Trichoptera) sedrenih barijera

undergraduate thesis

• Title (english): Secondary production of larvae of the family Hydropsychidae (Insecta: Trichoptera) on the tufa barriers
• Author: Daniela Kreber
• Mentor: Marko Miliša (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2017-12-22, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Ličinke tulara isključivo su akvatičke i čine jednu od najzastupljenijih skupina životinja vodenog ekosustava Plitvičkih jezera, gdje obitavaju prvenstveno na sedrenim barijerama. Porodica Hydropsycidae spada u procjeđivačku faunu, skupinu koja je izuzetno važna u sustavu preljevnih jezera u kojima jezerska voda sadrži veći dio organskih čestica. Procjeđivači te čestice eliminiraju iz stupca vode i pretvaraju u biomasu koja je raspoloživa u bentoskoj zajednici i tako sudjeluju u prijenosu... More energije od sestona do tkiva životinja. U ovom radu prikazan je obrazac rasta ličinki roda Hydropsyche na dvjema sedrenim barijerama (izljevi jezera Milanovac i Novakovića Brod) te količina sekundarne produkcije tijekom njihovog razvoja. Razlučili smo da se radi o dvije vrste (Hydropsyche saxonica (McLachlan, 1884) i H. instabilis (Curtis, 1834)). Pri razlučivanju pet ličinačkih stadija primarno smo koristili širinu glave, ali pratili smo i duljinu glave i tijela, te masu koja je bila važan parametar pri izračunu sekundarne produkcije. Većina jedinki pronađena je u sloju mahovine. U dubljem sloju sedre pretežno su pronađene mlade ličinke, koje su primarno sakupljači te kasnije u životnom ciklusu prelaze na dominantni način prehrane. Najviše ličinki prvog i drugog stadija je zabilježeno u srpnju čime označavamo početak njihovog ciklusa.Vrsta H. saxonica bila je brojnija na barijeri Milanovac, a H. instabilis na barijeri Novakovića brod. Sveukupno na obje lokacije, H. saxonica je bila dominantnija u brojnosti, a osim toga bila je i većih dimenzija i posljedično većih vrijednosti sekundarne produkcije. Na barijeri Milanovac, ona je pokazala puno veću vrijednost sekundarne produkcije naspram vrste H. instabilis najvjerojatnije uslijed većih dimenzija. Less

Abstract (english)

Trichoptera larvae are exclusively aquatic and they are the most abundant group of animals in the aquatic ecosystem of Plitvice lakes, where they primarily live on tufa barriers. Family Hydropsychidae are a part of the filtering fauna, a functional group that is extremely important in the overflow lake system, where overflowing water contains great amount of organic particles. Filtering fauna eliminate these particles from the water column and transform them into biomass available in the... More benthic community and in that way, they participate in transferring energy. In this study, a growth pattern and the amount of the secondary production of the hydropsychid larvae at two tufa barriers (lakes Milanovac and Novakovića brod) is presented. I have determined that the dominance of two species (Hydropsyche saxonica (McLachlan, 1884) and H. instabilis (Curtis, 1834)). When distinguishing five larval stages, I primarily used the width of the head capsule, but I also noted the length of the head capsule and body, and the mass, which was an important parameter in the calculation of secondary production. Most of the individuals were found in the moss layer. In the deeper tufa layer, young larvae have been found, which are primarily collectors, transferring to dominant mode of filter feeding later in life cycle. The most larvae of the first and second stages were recorded in July, thus marking the beginning of their cycle. H. saxonica was more abundant at Milanovac barrier, and H. instabilis on Novakovića brod barrier. Overall, at both locations H. saxonica dominated in abundance, size and consequently in the amount of secondary production. At the Milanovac barrier, H. saxonica exhibited grater abundances and much higher value of secondary production versus H. instabilis, probably due to its body size. Less

• Keywords: Procjeđivači; Hydropsyche; ličinački stadij; sekundarna produkcija; Hrvatska
• Keywords (english): Filtering fauna; Hydropsyche; secondary production; larval stages; Croatia
• Language: croatian
• URN:NBN: urn:nbn:hr:217:315670
• Study programme: Title: Environmental Sciences; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-01-31 09:04:29