Makrozoobentos stalnih i povremenih krških izvora

master's thesis

• Title (english): Macroinvertebrate communities of permanent and temporary karstic springs
• Author: Franka Grbavac
• Mentor: Ana Previšić (mentor)
• Committee member: Ana Previšić (predsjednik povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Mladen Kerovec (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2015-02-27, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Izvori su mjesta koja predstavljaju ekoton, odnosno prijelaznu zonu gdje podzemna voda izbija na površinu Zemlje i oblikuje površinski tok. MeĎu izvorima se posebno izdvajaju krški izvori. Stalni krški izvori predstavljaju stabilna staništa s vrlo malim sezonskim promjenama abiotičkih uvjeta, dok povremeni izvori pokazuju izraţenije sezonske oscilacije. U ovom radu istraţena je zajednica makrozoobentosa četiri različita krška izvora, od toga tri stalna (izvor rijeke Krke, Krupe, Kosovčice) i jednog povremenog izvora (izvor Krčića). Provedeno je jednogodišnje istraţivanje s mjesečnim uzokovanjem makrozoobentosa uz pomoć Surberove mreţe. Na istraţivanim izvorima nisu zabiljeţena velika sezonska kolebanja fizikalno – kemijskih obiljeţja vode, ali postoje meĎusobne razlike, ovisno o porijeklu vode iz podzemlja. Najveće razlike u sastavu, strukturi i sezonskim promjenama zajednice makrozoobentosa istraţivanih izvora zabiljeţene su izmeĎu stalnih i povremenih izvora, ukazujući na vaţnost prisutnosti ili odsutnosti površinskog toka. Na stalnim izvorima zabiljeţena je veća raznolikost i gustoća skupina nego na izvoru rijeke Krčića, koji presušuje u ljetnim mjesecima. U stalnim izvorima najveća gustoća jedinki makrozoobentosa zabiljeţena je u mahovini, a na izvoru rijeke Krčića na valuticama, zahvaljujući velikoj gustoći jedinki vrste Micropterna nycterobia (Limnephilidae, Trichoptera). Navedena vrsta ima specifično prilagoĎen ţivotni ciklus na sezonsko presušivanje, a veliki udio takvih vrsta karakteristično je obiljeţje zajednica povremenih staništa.

Abstract (english)

Springs represent ecotons, i.e. the transition zone where groundwater rises to the surface of the earth forming surface flow. Karst springs are specific type of springs. Permanent karst springs represent stable habitats with very low seasonal variations of abiotic conditions, while temporary springs show more pronounced seasonal oscillations. In this study we explored the macroinvertebrate communities of four different karst springs, three of them were permanent (springs of the river Krka, Krupa and Kosovčica) and one temporary (Krčić spring). One-year research was conducted with monthly macroinvertebrates sampling using Surber sampler. Seasonal fluctuations in physico-chemical parameters of the water were generally low, nevertheless there were differences between the studied springs, depending on the origin of water. The greatest differences in the composition, structure and seasonal variations of macroinvertebrates were observed between permanent and temporary springs, indicating the importance of the presence of the surface flow. Overall, diversity and abundance of macroinvertebrates were higher at the permanent springs than the Krčić spring, which dries up in the summer months. In permanent springs, greatest abundance of macroinvertebrates was recorded in moss, whereas at the Krčić spring it was highest in the mesolithal, due to the high density of Micropterna nycterobia (Limnephilidae, Trichoptera). This species has specifically adapted life cycle to the seasonal drying up, and large proportion of such species is typical for communities in temporary habitat.

• Keywords: fizikalno-kemijska obiljeţja vode; sastav i struktura zajednice; mikrostaništa; tulari (Trichoptera); funkcionalne skupine
• Keywords (english): physico-chemical parameters; community composition and structure; microhabitats; caddisflies (Trichoptera); functional feeding guilds
• Language: croatian
• URN:NBN: urn:nbn:hr:217:121434
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-04-21 10:19:46