1. Factors influencing habitat selection of three cryptobenthic clingfish species in the shallow North Adriatic SeaDomen Trkov, Danijel Ivajnšič, Marcelo Kovačić, Lovrenc Lipej, 2021, original scientific article Abstract: Cryptobenthic fishes were often overlooked in the past due to their cryptic lifestyle, so knowledge of their ecology is still incomplete. One of the most poorly studied taxa of fishes in the Mediterranean Sea is clingfish. In this paper we examine the habitat preferences of three clingfish species (Lepadogaster lepadogaster, L. candolii, and Apletodon incognitus) occurring in the Gulf of Trieste (Northern Adriatic). The results show that all three species have a cryptic lifestyle and are well-segregated based on their depth distribution and macro- and microhabitat preferences. L. lepadogaster inhabits shallow waters of the lower mediolittoral and upper infralittoral, where it occurs on rocky bottoms under stones. L. candolii similarly occurs in the rocky infralittoral under stones, but below the lower distribution limit of L. lepadogaster, and in seagrass meadows, where it occupies empty seashells. Such hiding places in seagrass meadows are also occupied by A. incognitus, which mostly occurs below the lower distribution limit of L. candolii. Despite the overlap of depth and macrohabitat, the probability of individuals of two species encountering each other or competing in the same habitat is low when the depth range is combined with the microhabitat preferences of these species.
Keywords: cryptobenthic fish, clingfish, habitat selection, depth distribution, Lepadogaster lepadogaster, Lepadogaster candolii, Apletodon incognitus
Published in DKUM: 18.10.2024; Views: 0; Downloads: 7
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2. Krčenje morskih travnikov v slovenskem morju zaradi vpliva podnebnih sprememb in drugih posrednih dejavnikovLovrenc Lipej, Borut Mavrič, Domen Trkov, Martina Orlando-Bonaca, Danijel Ivajnšič, 2022, independent scientific component part or a chapter in a monograph Abstract: V zadnjih desetletjih smo priča postopnemu izginjanju morskih travnikov na globalnem nivoju, pri čemer naj bi se njihova površina skrčila za tretjino. Tudi v slovenskem delu Jadrana prihaja do krčenja morskih travnikov, glavne vzroke za to moramo pripisati dejavnikom, kot so plovne poti in pristaniške dejavnosti, poglabljanje morskega dna, komercialne in rekreacijske dejavnosti, kot sta ribolov in privezovanje, odtekanje vode z urbanih in kmetijskih območij, v zadnjem času tudi vse intenzivnejše podnebne spremembe in kisanje oceanov. V pričujoči publikaciji predstavljamo rezultate kartiranja morskih travnikov v Krajinskem parku Strunjan, kjer je bilo v zadnjih letih, zlasti od leta 2018, opaženo obsežno upadanje. Ob tem razpravljamo o dejavnikih, ki vplivajo na razširjenost in regresijo morskih travnikov. Uporaba digitalnih ortofoto posnetkov in satelitskih podob (daljinsko zaznavanje) sta se izkazali za obetavni metodi, ki sta omogočili ugotavljanje prostorskih sprememb v času. Na predelih notranjega dela Strunjanskega zaliva so se travniki kolenčaste cimodoceje (Cymodocea nodosa) skrčili za več kot 80 % površine iz leta 2017. Upoštevaje pokrovnost morskih travnikov v celotnem slovenskem morju se je ta v letih od 2017 do 2018 zmanjšala za približno dobro petino.
Keywords: morski travniki, izginjanje, kartiranje, podnebne spremembe
Published in DKUM: 03.06.2024; Views: 129; Downloads: 20
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3. Evaluating seagrass meadow dynamics by integrating field-based and remote sensing techniquesDanijel Ivajnšič, Martina Orlando-Bonaca, Daša Donša, Jaša Veno Grujić, Domen Trkov, Borut Mavrič, Lovrenc Lipej, 2022, original scientific article Abstract: Marine phanerogams are considered biological sentinels or indicators since any modification in seagrass meadow distribution and coverage signals negative changes in the marine environment. In recent decades, seagrass meadows have undergone global losses at accelerating rates, and almost one-third of their coverage has disappeared globally. This study focused on the dynamics of seagrass meadows in the northern Adriatic Sea, which is one of the most anthropogenically affected areas in the Mediterranean Sea. Seagrass distribution data and remote sensing products were utilized to identify the stable and dynamic parts of the seagrass ecosystem. Different seagrass species could not be distinguished with the Sentinel-2 (BOA) satellite image. However, results revealed a generally stable seagrass meadow (283.5 Ha) but, on the other hand, a stochastic behavior in seagrass meadow retraction (90.8 Ha) linked to local environmental processes associated with anthropogenic activities or climate change. If systemized, this proposed approach to monitoring seagrass meadow dynamics could be developed as a spatial decision support system for the entire Mediterranean basin. Such a tool could serve as a key element for decision makers in marine protected areas and would potentially support more effective conservation and management actions in these highly productive and important environments.
Keywords: Adriatic Sea, seagrass meadow, change analysis, Cimodocea nodosa, image classifiers, Sentinel-2, marine biology, hydrobiology
Published in DKUM: 17.05.2024; Views: 152; Downloads: 17
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4. Coastal fish fauna in the Cystoseira s.l. algal belts : experiences from the Northern Adriatic SeaLovrenc Lipej, Danijel Ivajnšič, Valentina Pitacco, Domen Trkov, Borut Mavrič, Martina Orlando-Bonaca, 2023, original scientific article Abstract: Cystoseira s.l. forests are recognised as important habitats which host diverse coastal fish assemblages. Many fish species use such habitats as feeding, breeding, and nursery grounds. Since the coastal fish community depends on the availability of dense macroalgal belts, the decline of these habitats in the Mediterranean Sea also affects the density of coastal fish species. We studied the coastal fish assemblage in Cystoseira s.l. forests in three consecutive years 2019–2021 in the Gulf of Trieste (Adriatic Sea). Data on coastal fish fauna were collected by visual counts conducted by SCUBA diving. Data on algal cover and habitat types were obtained by recording with a video camera. Similarities and differences in the fish community were analysed in terms of habitat and substrate preferences. A total of 34 species were recorded in Cystoseira forests. The results of the present study show that the different algal cover and associated depth gradient have different effects on the fish assemblage in coastal waters, affecting species composition and abundance. For many species, particularly labrids and sea breams, there is a decreasing temporal trend in frequency of occurrence and density. However, fish community trends can be used as a good “proxy” to evaluate the algal belt status. Our results indicate that rapid conservation and restoration actions are needed to stem the decline of Cystoseira s.l. forests.
Keywords: Cystoseira s.l. forests, fish assemblage, fish biodiversity, habitat preference, macroalgal belt, Mediterranean Sea
Published in DKUM: 19.04.2024; Views: 239; Downloads: 14
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