1. Toward the first documented extinction of a marine macroalga in the Mediterranean Sea?Emmanuelle Patricia Descourvières, Vinko Bandelj, Adriano Sfriso, Martina Orlando-Bonaca, Vesna Mačić, Ljiljana Iveša, Silvija Kipson, Edi Gljušćić, Claudio Battelli, Isabella Moro, Cosimo Solidoro, Annalisa Falace, 2024, izvirni znanstveni članek Povzetek: Fucus virsoides is a glacial relict-species endemic to the Adriatic that was widespread from northern Italy to southern Albania. In recent decades, however, it has suffered an alarming decline. In this study, all available records were reviewed to reconstruct its historical and current occurrence and to investigate the possible causes of its decline. Comprehensive mapping revealed a continuing decline with a significant shift, leaving only about 20 fragmented populations. While the species is already classified as critically endangered in Albania, F. virsoides could be considered functionally extinct in Istria (Croatia), critically threatened with extinction in Italy and Montenegro and locally extinct in Slovenia. The status of the species in the rest of Croatia is still unclear. The remaining populations are located in areas characterised by low temperatures, low salinity and high nutrient concentrations. Long-term analyses of these key abiotic factors revealed profound changes that suggest a link to the species' decline. This study provides a thorough assessment of the overall status of F. virsoides and argues for its inclusion on the IUCN Red List. Immediate conservation measures are needed for the long-term survival of this species.
Ključne besede: Adriatic sea, endangered species, distribution, hydrobiology, marine biology
Objavljeno v DiRROS: 28.08.2024; Ogledov: 167; Prenosov: 367
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2. On the occurrence of early life stage of the king of herrings, Regalectus glesne (Actinopterygii: Lampriformes: Regalectidae), in the Adriatic SeaBranko Dragičević, Armin Pallaoro, Robert Grgičević, Lovrenc Lipej, Jakov Dulčić, 2011, drugi znanstveni članki Povzetek: The occurrence of an early life stage of the king of herrings, Regalecus glesne Ascanius, 1772, is reported for the first time from the Adriatic waters. A single larva (SL = 103.4 mm) was found alive in the waters of open Adriatic near a remote Island PalagruĹľa. Findings of early life stages of this species are very rare in the Mediterranean and have previously been reported only from the waters of the Strait of Sicily and Elba Island.
Ključne besede: fishes, ichthyology, Adriatic sea, Regalectidae, Regalectus glesne, oar fish, Adriatic Sea, larva, diversity, early life stage, record, king of herrings, Central Adriatic
Objavljeno v DiRROS: 07.08.2024; Ogledov: 170; Prenosov: 193
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3. First substantiated record of a lessepsian migrant - the dusky spinefood, Siganus luridus (Actinopterzgii: Perciformes: Siganidae), in the Adriatic SeaJakov Dulčić, Branko Dragičević, Robert Grgičević, Lovrenc Lipej, 2011, drugi znanstveni članki Povzetek: One specimen of the dusky spinefoot, Siganus luridus (Rüppell, 1829) (+, total length = 17.3 cm, total weight = 87.61 g), a lessepsian migrant, was captured in the Mljet Channel (Southern Adriatic, Croatian coast) on 15 November 2010. This is the second record of this species from the Adriatic, but first well documented and based on the captured specimen. First record occurred earlier in the Northern Adriatic, but was based solely on underwater observations.
Ključne besede: fishes, ichthyology, Adriatic sea, Siganidae, lessepsian migrants, diversity, origins, Mediterranean, new record, Adriatic Sea
Objavljeno v DiRROS: 07.08.2024; Ogledov: 203; Prenosov: 99
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4. Range expansion of alien nudibranch Melibe viridis (Kelaart, 1858) in the northern Adriatic SeaLovrenc Lipej, Borut Mavrič, 2017, drugi znanstveni članki Povzetek: The alien nudibranch Melibe viridis (Kelaart, 1858) was recorded in the waters of Slovenia (Gulf of Trieste, northern Adriatic Sea). A specimen was photographed and fi lmed on rocky hard bottom of the Natural Monument Cape Madona in October 2016. This is the fi rst record of this large sized nudibranch for Slovenia and for the Gulf of Trieste, as well, and a new one among otherwise rare records on this species in the Adriatic Sea.
Ključne besede: Slovenia, non indigenous species, Adriatic Sea
Objavljeno v DiRROS: 07.08.2024; Ogledov: 192; Prenosov: 191
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6. First record of the bryozoan Tricellaria inopinata (dʼHondt & Occhipinti Ambrogi, 1985) from the Slovenian seaAna Fortič, Borut Mavrič, 2018, drugi znanstveni članki Povzetek: In this paper we present the first record of Tricellaria inopinata d’Hondt & Occhipinti Ambrogi, 1985 for the Slovenian coastal sea. The colonies of this bryozoan were found attached to the mussel shells in the sight of Sečovlje, Strunjan and Debeli rtič mussel cultures from April to October 2018 and in Valdoltra harbour in November 2018. After the introduction into the Lagoon of Venice in the 1980s and its rapid spread throughout the lagoon in the following years, the species was regarded as an invasive taxon for that area and it is highly expected to colonize the whole Northern Adriatic region. The status of T. inopinata and its ecological impact has yet to be determined for the Slovenian coastal sea.
Ključne besede: alien species, Gulf of Trieste, Adriatic Sea, mussel aquaculture
Objavljeno v DiRROS: 07.08.2024; Ogledov: 180; Prenosov: 133
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7. Occurrence of ribbon fish (Trachipterus trachypterus) In Slovenian waters (Northern Adriatic Sea)Lovrenc Lipej, Domen Trkov, Borut Mavrič, 2018, drugi znanstveni članki Povzetek: On 6th May 2018 a juvenile specimen of ribbon fish (Trachipterus trachypterus) was collected in shallow waters in Izola (Slovenia, northern Adriatic Sea). It measured 403 mm in total length and weighed 37.1 g. In stomach, fragments of seagrasses, pollen cones of pine, petals of terrestrial plant, fragments of terrestrial grass and beetles were found among food remains. The possible causes of this finding in Slovenian waters could be attributed to the ingression of southern Adriatic waters in its northern part. The specimen studied in this paper is the fifth record of this species in the Slovenian part of the Adriatic Sea. The cooperation between ichthyologists and fishermen proved to be crucial for the detection of the ribbon fish and other rare and less-known fish species, as well.
Ključne besede: ribbon fish, occurrence (biology), diet, Adriatic Sea
Objavljeno v DiRROS: 07.08.2024; Ogledov: 188; Prenosov: 147
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8. Food and feeding habits of the blackspotted smooth-hound, Mustelus punctulatus (Elasmobranchii: carcharhiniformes: Triakidae), from the Northern AdriaticLovrenc Lipej, Borut Mavrič, Snežna Rešek, Mourad Cherif, Christian Capapé, 2011, izvirni znanstveni članek Povzetek: Background. The blackspotted smooth-hound, Mustelus punctulatus Risso, 1826, has been regularly caught in the northern Adriatic Sea, although a decreasing trend in its catches was observed off the coast of Slovenia within the last decade The knowledge of feeding behaviour of elasmobranch fish species, through understanding of the local food web structure, contributes to better and more efficient fish stock assessment and ecosystem modelling. This study is a first step in determining the prey consumption by the blackspotted smooth-hound in the area. Materials and methods. A total of 151 blackspotted smooth-hounds caught by commercial fishermen in the Gulf of Trieste from 4 June 2002 to 4 June 2003 were examined in this study. The stomach contents were removed, sorted and identified to the lowest possible taxon using identification keys. Preys were counted and weighed. Frequency of occurrence (F%), relative abundance (N%), the percentage by weight (W%), the Index of Relative Importance (IRI), and its standardized value (%IRI) were calculated following standard procedures. For comparing the diet between four different size classes we calculate average prey weight, dietary diversity, average meal, and trophic level for each size class. Results. A total 130 fish stomachs contained prey items. Crustaceans were the most important prey items (IRI% = 56.14), whereas cephalopods were the second mostly preyed animals (IRI% = 20.2). Teleost fish and bivalves were also found in the stomachs. The most important prey species was Solecurtus strigillatus. Larger sharks consumed larger preys. Male and female sharks consumed similar food. Juvenile individuals consumed predominantly crustaceans, while cephalopods were more important in the diet of adult individuals. The calculated trophic index (TROPH) of M. punctulatus from northern Adriatic Sea was 3.7, showing that it is a highly carnivorous species. Conclusion. This study is a first step in determining prey consumption by Mustelus punctulatus which is, despite the fact that is still common in the area, a rather poorly known species. For elucidating the role of benthic sharks in the study area the further step would be to study the diet of a closely related common smooth-hound M. mustelus.
Ključne besede: fishes, ichthyology, Adriatic sea, Triakidae, Mustelus punctulatus, trophic level, northern Adriatic, elasmobranchii, diversity, Mustelus, Mediterranean, feeding, Adriatic Sea
Objavljeno v DiRROS: 05.08.2024; Ogledov: 221; Prenosov: 163
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9. Interannual size changes of adult Aurelia sp.5 medusae stage in the Marine protected Area of Mljet Island South AdriaticTjaša Kogovšek, Juan Carlos Molinero, Davor Lučić, Ivona Onofri, Barbara Gangai, Marijana Miloslavić, Delphine Bonnet, Alenka Malej, 2012, izvirni znanstveni članek Povzetek: Aurelia aurita s.l. is the most widespread scyphozoan jellyfish that recurrently appear “en mass” and forms large aggregations mainly in coastal waters, embayments and estuaries. Beside anthropogenic factors controlling jellyfish populations climate change may play an important role. The aim of this study was to assess whether climate-related factors in absence of other anthropogenically induced stressor influence medusae size. We investigated seasonal and interannual changes in the size of Aurelia in a “jelly lake” in the National Park of Mljet Island (Croatia) where minimal human impact on the environment makes the Veliko Jezero a natural mesocosm for understanding the impact of climate change on the Aurelia population. The observed changes suggest Aurelia medusa population response to changing environment, in particular to enhanced temperature, by reduced body sizes. Comparison of Aurelia population dynamics from different regions in the Mediterranean Sea revealed the unique feature of the Veliko Jezero population. Despite the similarity of the environmental windows of medusae occurrences in the Veliko Jezero and regions in the Mediterranean Sea, medusae in the Veliko Jezero are present all year round. It seems that the lake bathymetry enables medusae to vertically migrate to deeper and cooler water layer, avoiding the limiting temperatures developed in the upper layer during the summer. These conditions may prolong the Aurelia medusae life span and together with continuous strobilation support the stability of the Aurelia medusae population all year round.
Ključne besede: Mediterraneum, moon jellyfish, Adriatic Sea, South Adriatic Sea, marine lakes, Aurelia spp, climate-related factor, Mediterranean Sea, marine research, population dynamics
Objavljeno v DiRROS: 05.08.2024; Ogledov: 186; Prenosov: 82
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10. The epiplankton community in the southern Adriatic: multiple trophic levels along the south - north and inshore-offshore gradientsValentina Turk, Davor Lučić, Jakica Njire, Senka Terzić, Tinkara Tinta, Adam Benović, Alenka Malej, 2012, izvirni znanstveni članek Povzetek: The epiplankton community was investigated during Meduza cruises along south - north and offshore – inshore transects in the middle and southern Adriatic in spring 2002. The diel and vertical distribution of heterotrophic bacteria, phytoplankton pigment composition, micro- and mesozooplankton were assessed. At most stations we observed a thermocline at approximately 20 m and a prominent chlorophyll a peak at about 70 m depth. The integrated phytoplankton and bacterial biomass were lower at the station in the central part of the southern Adriatic, and increased gradually towards middle Adriatic and towards coastal stations. Vertical profiles of both bacterial abundance and production showed a distinct peak in the surface layer. Bacterial abundance was high also in the layer of the deep chlorophyll a maximum. Higher bacterial production was associated with elevated abundance of pico- and nanoplankton feeding zooplankton indicating that bacterial populations were generally controlled by predation.
Ključne besede: Meduza project, heterotrophic bacteria, Adriatic Sea, South Adriatic Sea, phytoplankton pigments, open sea, microzooplankton, mesozooplankton, research cruises
Objavljeno v DiRROS: 05.08.2024; Ogledov: 219; Prenosov: 107
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