1. A link between species abundance and plant strategies for semi-natural dry grasslandsNataša Pipenbaher, 2024, izvirni znanstveni članek Opis: Due of the potential of species to determine ecosystem properties, it is important to understand how species abundance influences community assembly. Using vegetation surveys on 35 dry grasslands in north-east Slovenia, we defined dominant (8) and subordinate (61) plant species. They were compared on 14 traits to test for differences in community-weighted mean (CWM) and functional diversity (FD). We found that dominants and subordinates differed strongly in their functional traits. Dominants showed higher leaf dry matter content and a more pronounced stress tolerance strategy and were all clonal with a large proportion of species with rhizomes and a rich bud bank, while other species showed a higher specific leaf area, a longer flowering period and more ruderals. For most traits, FD was higher in subordinates. Our results suggest that dominants drive community structure by limited susceptibility to non-competitive processes. Dominants may have positive effects on subordinates by mitigating environmental stressors. Subordinates are able to assemble together by being dissimilar and use different fine-scale niches that are engineered and homogenised by dominants. Our results show that there are fundamental differences in the relative importance of ecological processes between dominant and subordinate plants in species-rich grasslands, which is also important for their conservational management.
Ključne besede: species coexistence, biodiversity, community assembly, species dominance, subordinate species, Festuco-Brometea, plant functional traits, community structure
Objavljeno v DKUM: 26.02.2025; Ogledov: 0; Prenosov: 7
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2. Fragmented Romanian sociology: growth and structure of the collaboration networkMarian-Gabriel Hâncean, Matjaž Perc, Lazǎr Vlǎsceanu, 2014, izvirni znanstveni članek Opis: Structural patterns in collaboration networks are essential for understanding how new ideas, research practices, innovation or cooperation circulate and develop within academic communities and between and within university departments. In our research, we explore and investigate the structure of the collaboration network formed by the academics working full-time within all the 17 sociology departments across Romania. We show that the collaboration network is sparse and fragmented, and that it constitutes an environment that does not promote the circulation of new ideas and innovation within the field. Although recent years have witnessed an increase in the productivity of Romanian sociologists, there is still ample room for improvement in terms of the interaction infrastructure that ought to link individuals together so that they could maximize their potentials. We also fail to discern evidence in favor of the Matthew effect governing the growth of the network, which suggests scientific success and productivity are not rewarded. Instead, the structural properties of the collaboration network are partly those of a core-periphery network, where the spread of innovation and change can be explained by structural equivalence rather than by interpersonal influence models. We also provide support for the idea that, within the observed network, collaboration is the product of homophily rather than prestige effects. Further research on the subject based on data from other countries in the region is needed to place our results in a comparative framework, in particular to discern whether the behavior of the Romanian sociologist community is unique or rather common.
Ključne besede: collaboration network, small-world network, community structure, sociology, network science
Objavljeno v DKUM: 19.06.2017; Ogledov: 1230; Prenosov: 422
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3. Community structure and the evolution of interdisciplinarity in Slovenia's scientific collaboration networkBorut Lužar, Zoran Levnajić, Janez Povh, Matjaž Perc, 2014, izvirni znanstveni članek Opis: Interaction among the scientific disciplines is of vital importance in modern science. Focusing on the case of Slovenia, we study the dynamics of interdisciplinary sciences from 1960 to 2010. Our approach relies on quantifying the interdisciplinarity of research communities detected in the coauthorship network of Slovenian scientists over time. Examining the evolution of the community structure, we find that the frequency of interdisciplinary research is only proportional with the overall growth of the network. Although marginal improvements in favor of interdisciplinarity are inferable during the 70s and 80s, the overall trends during the past 20 years are constant and indicative of stalemate. We conclude that the flow of knowledge between different fields of research in Slovenia is in need of further stimulation.
Ključne besede: community structure, interdisciplinarity, scientific collaboration, research funding, Slovenia
Objavljeno v DKUM: 19.06.2017; Ogledov: 1332; Prenosov: 397
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