Title Istraživanje utjecaja kaveznog uzgoja bijele ribe na strukturu zajednica meiofaune kod otoka Vrgade Title (english) Fish-farm impact on meiofauna community structure in the island Vrgada Author Anamaria Baričević Mentor Bruna Petani (mentor)Mentor Ivan Župan (komentor)Committee member Tomislav Šarić (predsjednik povjerenstva)Committee member Bruna Petani (član povjerenstva)Committee member Bosiljka Mustać (član povjerenstva)Granter University of Zadar Defense date and country 2019-07-10, Croatia Scientific / art field, BIOTECHNICAL SCIENCES Abstract Povećanjem intenziteta kaveznog uzgoja morskih organizama dolazi do sve veće potrebe praćenja utjecaja rada uzgajališta na okoliš. Jedan od glavnih utjecaja intenzivnog uzgoja vidljiv je u vidu promjena u kvalitativnom i kvantitativnom sastavu zajednica meiofaune i makrofaune sedimenta. Cilj ovog rada je bio utvrditi utjecaj kaveznog uzgoja lubina i komarčenamorskiokoliškrozpromjeneu brojnostiisastavu strukturezajednicameiofauneu sedimentu. Uzorci sedimenta prikupljeni su u tri replike autonomnim ronjenjem na tri postaje: na samom rubu kaveza (i.e., P1), neposredno ispod kaveza uzgajališta (i.e., P2), te referentna postaja (i.e., REF) na udaljenosti oko 700 m od kaveza uzgajališta. Prilikom uzorkovanja prikupljeni su i popratni fizikalno-kemijski parametri, poput temperature, salinitea, zasićenog kisika, otopljenog kisika, klorofila a, prozirnosti i pH vrijednosti mora. Nakon prikupljanja i pohrane uzoraka, organizmi su odvojeni od sedimenta te prebrojani i identificirani pod povećanjem od 40× do 400×, ovisno o vrsti. Obradom rezultata ustanovljen je značajno veći broj svojti meiofaune na referentnoj postaji nego na postajama samog ruba uzgajališta, te neposredno ispod kaveza, što potvrđuje utjecaj uzgajališta. Najveće razlike u ukupnoj brojnosti meiofaune su uočene u površinskom sloju sedimenta (i.e., 0-1 cm) između postaje REF i postaje P1, dok je ukupna brojnost meiofaune najveća u postaji P2, uzorkovana taloženjem organske tvari u sedimentu ispod uzgajališta. Na svim postajama dominiraju skupine Nematoda i Copepoda, dok su skupine najosjetljivije na onečišćenje (e.g., Bivalvia, Ostracoda, Tardigrada, Larve Priapulidi) zabilježene samo na referentnoj postaji. Nadalje, značajno veći broj rijetkih svojti meiofaune je ustanovljen na referentnoj postaji nego na postajama P1 i P2. Ovi rezultati ukazuju na promjene u brojnosti i strukturi zajednica meiofaune uzrokovane taloženjem organske tvari u sedimentu ispod uzgajališta, ističući time važnostprovođenjaredovitog monitoringa tekorištenjameiofaune kaododatnog indikatoraza praćenjestanjaokolišaipromjenauzrokovanihonečišćenjem.
Abstract (english) By increasing the intensity in marine organisms farming, there is a need for monitoring the impact of fish farm on the environment. One of the main impact of intensive fish production is variability in qualitative and quantitative composition of meiofaunal and macrofaunal community structure. The objective of this study was to determine the impact of sea bass and sea bream farms on the marine environment through changes in the meiofaunal abundance and community structure in the sediment. Sediment samples were collected in three replicate corers by SCUBA diving at three stations: at the edge of the cages (i.e., ST 1) directly below the farm cages (i.e., ST 2) and at the control station (i.e., CTRL ST) situated at distance of approximately700mfromthefishfarm. Physical-chemical parameters such as temperature, salinity, saturated oxygen, dissolved oxygen, chlorophyll-a, turbidityand pHvalues of water columnwere also recorded during the sampling. After collecting and storing the samples, organisms were separated from the sediment, counted and identified on microscope under magnification from 40× to 400× depending on the species. These results showed a significantly higher number of meiofaunal taxa on the control station comparing to the stations at the edge of the cages, and directly below the cages, which confirms the impact of fish farm. The greatest differences in total abundance of meiofauna were found in the sediment surface layer (i.e., 0-1 cm) between the control station and P1, while total abundance of meiofauna was the highest in P2, caused by deposition of organic matter in the sediment below the fish farm. All stations are dominated by Nematoda and Copepoda, while rare taxa (e.g., Bivalvia, Ostracoda, Tardigrada, Larve Priapulidi)were recorded onlyat thecontrol station.Furthermore, significantlyhighernumber of rare meiofaunal taxa was found at control station than at stations P1 and P2. These results indicate at changes and higher variability in terms of meiofaunal abundance and community structure caused by deposition of organic matter in the sediment below the fish farm, pointing out the importance of regular monitoring and use of meiofauna as an additional indicator for environmentalmonitoringandchangesintheenvironmentcausedbycontamination.
Keywords
meiofauna
kavezni uzgoj
utjecaj kaveznog uzgoja
Jadransko more
otok Vrgada
Keywords (english)
meiofauna
fishfarming
fishfarmingimpact
Adriaticsea
Vrgadaisland
Language croatian URN:NBN urn:nbn:hr:162:786296 Study programme Title: Sustainable Management of Aquatic Ecosystems Type of resource Text File origin Born digital Access conditions Access restricted to students and staff of home institution Terms of use Created on 2019-10-28 16:02:25
