Iskanje po katalogu digitalne knjižnice

Opis: Svetlobno onesnaževanje predstavlja obliko onesnaževanja okolja, ki v javnosti še ni v dovolj veliki meri prepoznana. V poglavju smo predstavili stanje svetlobnega onesnaženja na Dravskem polju in njegove spremembe v obdobju 2013-2021. Procese spreminjanja svetlobnega onesnaženja smo prikazali s pomočjo podatkov daljinskega zaznavanja. Drugi vir podatkov so predstavljale meritve s Sky Quality Metrom, ki v svetu predstavlja standardiziran način merjenja svetlobnega onesnaženja. Prostorske razlike v stopnji svetlobne onesnaženosti med posameznimi deli Dravskega polja smo prikazali tudi z vsenebnimi posnetki in njihovo analizo.
Ključne besede: Dravsko polje, radianca, daljinsko zaznavanje, prostorske razlike
Objavljeno v DKUM: 24.10.2025; Ogledov: 0; Prenosov: 10
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Opis: Mulberry (Morus sp.) trees, traditionally cultivated for their leaves used in sericulture, have recently gained recognition for their adaptability and valuable ecosystem services. The biochemical composition of mulberry leaves varies both qualitatively and quantitatively, depending on genotype, environmental conditions, and cultivation practices. This study aimed to (1) identify differences in old local white (M. alba L.) and black mulberry (M. nigra L.) leaves, (2) perform a chemotype analysis of monitored local varieties, and (3) evaluate the influence of selected bioclimatic factors and pruning practices on the biochemical composition of leaves of white mulberry trees across Slovenian mesoregions. Black mulberry exhibited a higher phenolic content, particularly caffeoylquinic acid derivatives (16.05 mg/g dry weight (DW)), while white mulberry contained more quercetin glycosides (6.04 mg/g DW). Ward’s clustering identified three chemotypes, two of which had elevated protein and hydroxycinnamic acid levels, making them particularly suitable for silkworm feeding. Considering pruning practices of white mulberries, we determined significantly increased protein contents in yearly pruned trees (187.24 mg/g DW). Principal component analysis revealed interactions between bioclimatic, morphological, and biochemical factors, distinctly separating mulberries from the Sub-Mediterranean and Sub-Pannonian macroregions. White mulberries from Sub-Pannonian regions accumulated more caffeoylquinic acids in leaves under lower precipitation and total insolation, while those from Sub-Mediterranean regions exhibited higher kaempferol derivatives due to photo-thermal stress. These findings highlight the influence of climate and pruning on mulberry biochemical diversity and adaptation.
Ključne besede: mulberry, Morus alba, Morus nigra, local genetic resources, phenolics, protein, climatic effect, metabolite screening, pruning
Objavljeno v DKUM: 07.10.2025; Ogledov: 0; Prenosov: 5
Celotno besedilo (7,53 MB)
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Opis: Westudied the feeding habits of the common eagle ray (Myliobatis aquila) in the shallow northern Adriatic Sea. Altogether we analysed the contents of 122 stomachs of specimens caught as by-catch in the Gulf of Trieste and along the west Istrian coast. Shelled molluscs (N%=75.17), mainly bivalves and gastropods, were the most prominent prey categories, while crustaceans, sipunculids, echinoderms and polychaets (N% < 10) represented consid erably smaller numbers. With increasing size (and age) the eagle rays tend to become more experienced in preying molluscs and specialized to this prey category. The obtained results are in general in agreement with the limited existing reports on the diet of the common eagle ray in the Mediterranean Sea and adjacent areas.
Ključne besede: food habits, myliobatid, ontogenetic shift, Adriatic Sea
Objavljeno v DKUM: 25.08.2025; Ogledov: 0; Prenosov: 7
Celotno besedilo (1,16 MB)
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Ključne besede: field survey, habitat destruction, habitat modelling, Iraq, Nesokia bunnii, threatened species
Objavljeno v DKUM: 14.02.2025; Ogledov: 0; Prenosov: 5
Celotno besedilo (2,08 MB)
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Opis: 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.
Ključne besede: cryptobenthic fish, clingfish, habitat selection, depth distribution, Lepadogaster lepadogaster, Lepadogaster candolii, Apletodon incognitus
Objavljeno v DKUM: 18.10.2024; Ogledov: 0; Prenosov: 9
Celotno besedilo (4,40 MB)
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