1. Dynamics of Mesozooplankton Along the Eastern Coast of the South Adriatic SeaMarijana Hure, Davor Lučić, Barbara Gangai Zovko, Ivona Onofri, 2022, original scientific article Abstract: Temporal and spatial variability of the mesozooplankton community was studied along the eastern coast of the south Adriatic Sea on a monthly basis from October 2012 to September 2013. Samples were collected at three stations using a 200 μm mesh Nansen net by vertical hauls at two depth layers. A total of 141 holoplanktonic taxa were identified, of which copepods were the dominant group. Total abundances showed high temporal variation (from 181 ind.m-3 in October to 1923 ind.m-3 in May). The mesozooplankton community differed significantly between the investigated layers and seasons. Deeper layers as well as the winter period were characterized by a subsurface and mesopelagic fauna, while over the warmer months the dominance of typically coastal Adriatic species was recorded. Comparing our results with studies carried out in the middle of the last century, it can be concluded that the eastern coast of the southern Adriatic hosts a stable mesozooplankton community, less affected by global changes.
Keywords: copepods, seasonal variations, zooplankton, Mediterranean Sea
Published in DiRROS: 28.08.2026; Views: 107; Downloads: 63
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2. Raziskave ekološkega stanja Prvega (Jezero pod Vršacem), Petega in Šestega (Dvojno jezero) Triglavskega jezera : končno poročiloNataša Mori, Žiga Ogorelec, Annasibila Požrl, David Stanković, Tina Eleršek, Nika Tivadar, Mojca Vek, Tatjana Simčič, Andrej Kapla, Matjaž Bedjanič, final research report Abstract: V poročilu so predstavljeni rezultati ekološke raziskave Prvega (Jezero pod Vršacem), Petega in Šestega (Dvojno jezero) Triglavskega jezera v dolini Sedmerih Triglavskih jezer. Prvo jezero je najbolj severno ležeče jezero v dolini, ki ima dva stalna pritoka iz dveh potočkov ter je bilo pred letom 1994 tudi poleti popolnoma ali delno prekrito z ledom, snegom in plundro. Po letu 1994 je jezero poleti večinoma brez snega in ledu. Dvojno Triglavsko jezero je bilo od leta 1991 naseljeno z ribami, kar je korenito spremenilo lastnosti obeh jezer, obenem sta jezera tudi pod vplivom planinske koče pri Triglavskih jezerih, ki se nahaja med Močivcem in Petim jezerom. Med letom 2020 in 2023 je, v okviru projekta Vrh Julijcev (Izboljšanje stanja vrst in habitatnih tipov Triglavskem narodnem parku), katerega vodilni partner je JZ Triglavski Nacionalni Park, potekal intenziven izlov rib in druge aktivnosti, kot je odstranjevanje makrofitov. Raziskavo v takšni obliki in obsegu smo izvedli prvič jeseni 2023, nato pa jo ponovili v septembru leta 2024 in 2025. Na terenu smo izmerili fizikalne, kemijske in izbrane biološke parametre jezer, odvzeli vzorce za kemijske analize vode, vzorce zooplanktona, fitoplanktona, fitobentosa (perifitona) ter bentoških nevretenčarjev, popisali prisotnost makrofitov in dvoživk ter rezultate primerjali s preteklimi podatki, pogledali dolgoročne trende in ovrednotili ekološko stanje vseh treh jezer. Raziskava v letu 2025 je nadaljevanje večletnega spremljanja stanja jezer, povzetega v poročilih pripravljenih s strani Nacionalnega Inštituta za biologijo za Triglavski nacionalni park od leta 2019 do leta 2024, hkrati pa tudi nadaljevanje raziskav, ki so se pričele v letu 1989 pod vodstvom biologov z Oddelka za biologijo Univerze Edvarda Kardelja in Inštituta za biologijo ter nadaljevale v 90. letih prejšnjega stoletja in prvem in drugem desetletju tega stoletja pod vodstvom prof. dr. Antona Branclja z Nacionalnega inštituta za biologijo. Prvo jezero je glede na izmerjene parametre v primerjavi z leti 2023 in 2024 ostalo v podobnem stanju z manjšimi odstopanji. Koncentracija klorofila a na gladini se je v Prvem jezeru po enem letu povišala, prav tako tudi koncentracija skupnega dušika na gladini, medtem ko je koncentracija skupnega dušika na dnu malenkost upadla, v primerjavi z letom 2023 pa so vrednosti še vedno nižje. Glede na leti 2023 in 2024 se je koncentracija skupnega fosforja znižala. Dodatne analize izvirov, ki se stekata v jezero so pokazale višje vrednoti nitratov v vzorcih iz izvirov kot v jezeru. Dno jezera tudi letos preraščajo nitaste zelene alge in lasastolistna vodna zlatica. V Petem jezeru se je kemijsko stanje v primerjavi z lanskim letom precej poslabšalo. Nasičenost s kisikom je po štirih letih ponovno padla pod 100% (dno), v primerjavi z leti 2023 in 2024 pa so analize pokazale tudi povišanje koncentracije klorofila a ter skupnega dušika. Presenetljivo pa je, da smo pri Šestem jezeru zaznali pozitivne spremembe, analize klorofila a so pokazale rekordno nizke vrednosti, prav tako analiza skupnega fosforja ter dušika, katerih koncentracija v Šestem jezeru z leti ves čas upada. Dno Dvojnega jezera še vedno povsem preraščajo nitaste zelene alge. Glede na vse zaznane spremembe se predlaga nadaljnje spremljanje stanja.
Keywords: visokogorska jezera, ekološko stanje, trofični indeks, kemični in biološki parametri, Dolina Sedmerih Triglavskih jezer, kemijska analiza vode, zooplankton
Published in DiRROS: 09.07.2026; Views: 265; Downloads: 2 |
3. Raziskave ekološkega stanja Prvega (Jezero pod Vršacem), Petega in Šestega (Dvojno jezero) Triglavskega jezera : končno poročiloŽiga Ogorelec, Nataša Mori, David Stanković, Tina Eleršek, Maruša Kerenčič, Gaber Gabrovšek, Tatjana Simčič, final research report Abstract: Sredi septembra 2024 se je izvedlo ekološke raziskave treh Triglavskih jezer. Raziskalo se je 1. jezero (Jezero pod Vršacem), v katerem je bilo v zadnjih letih opaženo močno zaraščanje z makrofiti, v letu 2023 pa je jezero imelo tudi povišane koncentracije klorofila a. Predmet raziskav je bilo tudi 5. in 6. oz. Dvojno jezero, na katerem je od 2020 do 2023 potekal intenziven izlov rib in druge aktivnosti projekta Vrh Julijcev. Analiziralo se je fizikalne, kemične in biološke parametre jezer, rezultate primerjalo s preteklimi podatki in tako ocenilo ekološko stanje in trende vseh treh jezer. Raziskave so bile nadaljevanje mnogoletnega monitoringa jezer, povzetega v lanskem poročilu (Raziskave o ekološkem stanju Prvega (Jezero pod Vršacem), Četrtega (Jezero v Ledvicah), Petega in Šestega (Dvojno jezero) ter Sedmega (Črno jezero) Triglavskega jezera). Glede na pretekle raziskave se je stanje v obdobju od 2011 do 2023 v 1. jezeru močno poslabšalo. Koncentracije klorofila a v vodnem stolpcu so izrazito narastle, jezersko dno pa so začeli preraščati makrofiti. V letu 2024 pa je bila koncentracija klorofila že precej nižja kot leto pred tem in kemijsko stanje boljše. Makrofiti v 1. jezeru pa se še vedno širijo in postopoma vse bolj preraščajo jezersko dno. Pri Dvojnem jezeru pa so bile letos opazne izboljšave ekološkega stanja. Že v preteklih letih je bil trend manjših izboljšav pri številnih kemijskih in bioloških parametrih. Izboljšava slednjih pa je bila letos še posebno izrazita pri 5. jezeru. Obe jezeri sta sicer še vedno močno prerastlo z nitastimi algami, zato se predlaga dokončen izlov rib za povrnitev v naravno oz. prvotno ekološko stanje jezera.
Keywords: visokogorska jezera, ekološko stanje, trofični indeks, kemični in biološki parametri, Dolina Sedmerih Triglavskih jezer, kemijska analiza vode, zooplankton
Published in DiRROS: 09.07.2026; Views: 257; Downloads: 3 |
4. Long-Term Study of Zooplankton Biomass in the South-Eastern Part of the Gulf of Trieste (Adriatic Sea)Jan Malej, Tjaša Kogovšek, Martin Vodopivec, Janja Francé, Patricija Mozetič, Matevž Malej, Alenka Malej, 2025, original scientific article Abstract: We present a dataset of zooplankton biomass spanning more than four decades (1974–2019). The dry mass of zooplankton ranged from below 10 to almost 100 mg m-3, was highest in 1989–2002 and declined thereafter. The interannual variability of zooplankton dry mass in the period 1993–2018 was compared with the regional atmospheric index WeMOi, chlorophyll a and frequency of jellyfish blooms. Increased dry mass values were associated with a positive phase of the regional atmospheric index WeMOi, higher chlorophyll a and a lower frequency of jellyfish blooms.
Keywords: net zooplankton, dry mass, time series, chlorophyll a, jellyfish blooms
Published in DiRROS: 24.06.2026; Views: 288; Downloads: 187
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5. Review of Eastern Adriatic hydromedusae: unravelling two centuries of recordsIvona Onofri, Davor Lučić, Alenka Malej, Barbara Gangai, 2026, review article Abstract: The Eastern Adriatic Sea is biogeographically complex, yet knowledge of its hydromedusae is fragmented across two centuries of uneven sampling and shifting taxonomy. This review integrates historical faunistic records (pre-1950), mid-century programmes (1950–2000), modern quantitative time series (post-2000), and citizen science observations to compile an updated checklist of 98 non-siphonophoran hydrozoan taxa. Records are synthesised across eight sub-regions, although the most continuous research has focused on the Northern Adriatic and the open South Adriatic. The clearest long-term signal is in the Northern Adriatic, where diversity collapsed by >60% from the 1960s to the 1980s, largely through the loss of meroplanktonic taxa with benthic polyp stages under eutrophication-driven hypoxia. Since 2000, oligotrophication coincides with a partial recovery, marked by the re-emergence of meroplankton and episodic intrusions of oceanic holoplankton (including Trachymedusae) linked to circulation regimes (BiOS). For the open South Adriatic, bathymetric distributions and diel vertical migration patterns are synthesised to characterise a persistent offshore core. Taxonomic updates and information on non-indigenous and bloom-forming taxa are provided. Methodological biases and gaps, especially polyp-stage ecology and spatial sampling voids, are highlighted, and routine DNA barcoding is recommended. The checklist provides a baseline for tracking change in a shifting ecosystem.
Keywords: gelatinous zooplankton, ecological collapse and recovery, citizen science, meroplankton, taxonomic checklist
Published in DiRROS: 02.03.2026; Views: 451; Downloads: 326
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7. Spatially explicit individual-based model reveals the mauve stinger jellyfish distribution in the Mediterranean SeaMartin Vodopivec, Alenka Malej, 2025, original scientific article Abstract: The mauve stinger Pelagia noctiluca is a holoplanktonic oceanic jellyfish known for its painful sting and large outbreaks at irregular intervals. As jellyfish field observations are almost exclusively limited to coastal regions, there are many unknowns about the spatial and temporal dynamics of most species. We approach the problem using a spatially explicit individual-based model for the mauve stinger in the Mediterranean Sea. The newly developed module for the OpenDrift Lagrangian particle tracking tool includes diel vertical migrations, fooddependent growth modeled on Michaelis–Menten kinetics, and custom mortality related to shallow waters and stranding. In the first part of the study, we analyze the resulting parameter space searching for solutions that ensure a stable Pelagia noctilucapopulation in the western Mediterranean Sea. In the second part, we conducted several 21-year simulations. Despite its relative simplicity, the model reveals for the first time the dynamic spatio-temporal distribution of Pelagia noctiluca. We demonstrate how spatially explicit individual-based model can be used to generate a realistic spatio-temporal distribution of marine zooplankton, even with a limited set of observations and loosely constrained parameters. The model code is easy to modify and freely available.
Keywords: individual-based model, agent-based model, zooplankton, Lagrangian particle tracking, ocean circulation, jellyfish
Published in DiRROS: 05.06.2025; Views: 1424; Downloads: 1150
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