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  1. Article ; Online: Disentangling structural and functional responses of native versus alien communities by canonical ordination analyses and variation partitioning with multiple matrices

    Ioan Sîrbu / Ana-Maria Benedek / Bryan L. Brown / Monica Sîrbu

    Scientific Reports, Vol 12, Iss 1, Pp 1-

    2022  Volume 14

    Abstract: Abstract Freshwaters are under accelerated human pressure, and mollusk communities are among its most sensitive, threatened, and valuable components. To the best of our knowledge, the overall effects of damming, environment, space, time, and invasive ... ...

    Abstract Abstract Freshwaters are under accelerated human pressure, and mollusk communities are among its most sensitive, threatened, and valuable components. To the best of our knowledge, the overall effects of damming, environment, space, time, and invasive alien mollusk species, on structural and functional responses of native mollusk communities were not yet compared. Using historical information and recent data from a river, we aimed to investigate and disentangle these effects and evaluate the differences in structural and functional responses of natives and alien invasives to the same predictors. Variation partitioning showed that alien species were as important predictors as were environmental factors and time in explaining species composition of native freshwater mollusk communities. Aliens were more independent of environmental conditions than natives and responded to different drivers, partially explaining their invasion success. The increased abundance of some alien gastropods was positively related to taxonomic diversity, while certain alien bivalves were negatively associated with the functional diversity of native communities. We introduce a cumulative variation partitioning with multiple response (native and alien) and predictor matrices, along with a diagram to show their relations, advocating for a conceptual shift in future community ecology, from “variables to matrices” and from “multivariate analyses to multi-matrix statistical modeling”.
    Keywords Medicine ; R ; Science ; Q
    Subject code 333
    Language English
    Publishing date 2022-07-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Responses of small mammals to habitat characteristics in Southern Carpathian forests

    Ana Maria Benedek / Ioan Sîrbu / Anamaria Lazăr

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 13

    Abstract: Abstract Compared to Northern Carpathians, the small mammal fauna of Southern Carpathian forests is poorly known, with no data on habitat use; our study seeks to fill this gap. To this end, we conducted a survey in the Southern Carpathians for five years, ...

    Abstract Abstract Compared to Northern Carpathians, the small mammal fauna of Southern Carpathian forests is poorly known, with no data on habitat use; our study seeks to fill this gap. To this end, we conducted a survey in the Southern Carpathians for five years, assessing habitat use by small mammals in forests along an elevational gradient. Trapping was done using live traps set in transects at elevations between 820 and 2040 m. For each transect we evaluated variables related to vegetation structure, habitat complexity, and geographical location. We considered abundance, species composition and species richness as response variables. The rodents Apodemus flavicollis and Myodes glareolus and the shrew Sorex araneus were common and dominant. Their abundance were positively correlated with tree cover, the best explanatory variable. Responses to other variables were mixed. The strong divergence in the relative habitat use by the three most abundant species may act as a mechanism that enables their coexistence as dominant species, exploiting the same wide range of habitat resources. Overall, habitat use in our study area was similar to that reported from Northern Carpathians, but we found also important differences probably caused by the differences in latitude and forest management practices.
    Keywords Medicine ; R ; Science ; Q
    Subject code 590
    Language English
    Publishing date 2021-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Small Mammals in Forests of Romania

    Anamaria Lazăr / Ana Maria Benedek / Ioan Sîrbu

    Forests, Vol 12, Iss 1107, p

    Habitat Type Use and Additive Diversity Partitioning

    2021  Volume 1107

    Abstract: Small mammals are key components of forest ecosystems, playing vital roles for numerous groups of forest organisms: they exert bottom-up and top-down regulatory effects on vertebrate and invertebrate populations, respectively; they are fungus- and seed- ... ...

    Abstract Small mammals are key components of forest ecosystems, playing vital roles for numerous groups of forest organisms: they exert bottom-up and top-down regulatory effects on vertebrate and invertebrate populations, respectively; they are fungus- and seed-dispersers and bioturbators. Therefore, preserving or restoring the diversity of small mammal communities may help maintain the functions of these ecosystems. In Romania, a country with low-intensity forest management and a high percentage of natural forests compared to other European countries, an overview of forest small mammal diversity and habitat type use is lacking, and our study aimed to fill this gap. We also aimed to partition the total small mammal diversity of Romanian forests into the alpha (plot-level), beta, and delta (among forest types) diversities, as well as further partition beta diversity into its spatial (among plots) and temporal (among years) components. We surveyed small mammals by live trapping in eight types of forest across Romania. We found that small mammal abundance was significantly higher in lowland than in mountain forests, but species richness was similar, being associated with the diversity of tree canopy, with the highest values in mixed forests. In contrast, small mammal heterogeneity was related to overall habitat heterogeneity. As predicted, community composition was most distinct in poplar plantations, where forest specialists coexist with open habitat species. Most of the diversity was represented by alpha diversity. Because of strong fluctuations in population density of dominant rodents, the temporal component of beta heterogeneity was larger than the spatial component, but species richness also presented an important temporal turnover. Our results show the importance of the time dimension in the design of the surveys aiming at estimating the diversity of small mammal communities, both at the local and regional scales.
    Keywords alpha ; beta ; and delta diversities ; rarefaction ; rodents ; shrews ; multivariate ordination ; community composition ; Plant ecology ; QK900-989
    Subject code 910 ; 580
    Language English
    Publishing date 2021-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Effects of Long-Term Habitat Protection on Montane Small Mammals

    Ana Maria Benedek / Anamaria Lazăr / Niculina Viorica Cic / Maria Denisa Cocîrlea / Ioan Sîrbu

    Diversity, Vol 14, Iss 38, p

    Are Sorex araneus and S. minutus More Sensitive Than Previously Considered?

    2022  Volume 38

    Abstract: Protection of natural areas by restricting human activities aims to preserve plant and animal populations and whole communities, ensuring the conservation of biological diversity and enhancement of ecosystem services. Therefore, it is expected that the ... ...

    Abstract Protection of natural areas by restricting human activities aims to preserve plant and animal populations and whole communities, ensuring the conservation of biological diversity and enhancement of ecosystem services. Therefore, it is expected that the longer the protection, the stronger the desired effects. We evaluated the responses of small mammals at the population and community levels under protection in the southern Carpathian Mountains. We surveyed small mammals for five years in sites with long- and short-term protection and non-protected. Besides protection status, we included elevation, habitat heterogeneity, and the month of survey as predictors in our models. As response variables, we considered abundance, presence, species composition and species richness. Community abundance responded to all four predictors and species composition was influenced by protection status and month of study. The shrews Sorex araneus and S. minutus had positive responses to protection, both in terms of abundance and relative abundance (their ratio within the community). Our results suggest that overall, montane small mammal communities respond positively to long-term protection, especially S. araneus and S. minutus. These shrew species are considered habitat generalists, but they appear to be in fact sensitive to the habitat quality enhanced through protection.
    Keywords protected area ; habitat heterogeneity ; elevational pattern ; seasonality ; Sorex araneus ; S. minutus ; Biology (General) ; QH301-705.5
    Subject code 333
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: The Bird Fauna From Lotrioara River Basin (Lotru Mountains, Romania)/ Avifauna din Bazinul Râului Lotrioara (Munții Lotrului, România)

    Benedek, Ana Maria / Ioan Sîrbu

    Travaux du Muséum national d'histoire naturelle "Grigore Antipa.". 2015 Nov. 26, v. 57, no. 1

    2015  

    Abstract: The results of a one year study of bird communities from the Lotrioara River Basin (Lotru Mountains, Romania), using the transect method along the main valley, are presented. The study aimed to reveal the characteristics of the community’s dynamics, both ...

    Abstract The results of a one year study of bird communities from the Lotrioara River Basin (Lotru Mountains, Romania), using the transect method along the main valley, are presented. The study aimed to reveal the characteristics of the community’s dynamics, both from spatial and temporal point of view. During the research period 70 species belonging to 9 orders were identified in the investigated area. The number of species decreases with the altitude, but it is also related to the heterogeneity of habitats. During the year the species’ number varies from a minimum in winter to a maximum in spring. Insectivores are the prevailing feeding guild in the bird communities from Lotrioara basin, but during the cold season the dominance is taken over by omnivorous and granivorous species.
    Keywords altitude ; avifauna ; basins ; birds ; cold season ; granivores ; habitats ; insectivores ; mountains ; omnivores ; spring ; watersheds ; winter ; Romania
    Language English
    Dates of publication 2015-1126
    Size p. 47-56.
    Publishing place De Gruyter Open
    Document type Article
    ISSN 1223-2254
    DOI 10.2478/travmu-2014-0005
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Dynamics of Asio otus L., 1758 (Aves: Strigiformes) winter-spring trophic regime in Western Plain (Romania)

    Benedek, Ana / Ioan Sîrbu

    Travaux du Muséum national d'histoire naturelle "Grigore Antipa.". 2011 Mar. 8, v. 53, no. 1

    2011  

    Abstract: The trophic regime of Asio otus is dominated by Microtus arvalis. In both areas the proportion of this species in the long-eared owl's food presents an important seasonal variation. In winter it moves usually through tunnels under the snow, thus being ... ...

    Abstract The trophic regime of Asio otus is dominated by Microtus arvalis. In both areas the proportion of this species in the long-eared owl's food presents an important seasonal variation. In winter it moves usually through tunnels under the snow, thus being less frequently hunted. When the main prey is scarce, alternative food resources are exploited, in these areas mice, which become dominant as a group. A significant variation is recorded also by the mean biomass of preys of Asio otus from Satu Mare. The average body mass increases with one third from January to March, when the efficiency of hunt is maximum.
    Keywords Asio otus ; biomass ; mice ; Microtus arvalis ; seasonal variation ; snow ; winter ; Romania
    Language English
    Dates of publication 2011-0308
    Size p. 479-487.
    Publishing place Versita
    Document type Article
    ISSN 1223-2254
    DOI 10.2478/v10191-010-0033-4
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Terrestrial Small Mammal Communities from Hârtibaciu Plateau (Romania)/Comunităţi de mamifere mici terestre din Podişul Hârtibaciu (România)

    Benedek, Ana Maria / Adrian Răulea / Adriana Vornicu / Anca Bucur / Ioan Sîrbu / Victoria Cociş

    Travaux du Muséum national d'histoire naturelle "Grigore Antipa.". 2015 Nov. 26, v. 57, no. 1

    2015  

    Abstract: Small mammal communities were studied by live trapping during August-September 2010 and June-September 2011 in three localities from Hârtibaciu Plateau, in southern Transylvania. The area is situated between 420 and 550 m a.s.l., and represents a mosaic ... ...

    Abstract Small mammal communities were studied by live trapping during August-September 2010 and June-September 2011 in three localities from Hârtibaciu Plateau, in southern Transylvania. The area is situated between 420 and 550 m a.s.l., and represents a mosaic of small patches of different land use. 200 traps were set in lines for three consecutive nights, in 80 different habitats representing 12 habitat types, both cultivated and semi-natural. 1235 small mammals belonging to 15 species (four soricomorphs and 11 rodents) were captured. Abundance of small mammals was expressed by means of capture index (number of individuals caught per 100 active trap-nights). The community structure was strongly shaped by habitat type, even in case of small land patches. Microtus arvalis prevailed in the investigated area, being the dominant species in open fields with high grassy vegetation. The density of this species increased strongly from the beginning of summer to autumn, when the traps were occasionally saturated with field voles.
    Keywords altitude ; autumn ; community structure ; dominant species ; habitats ; land use ; Microtus arvalis ; plateaus ; small mammals ; summer ; trapping ; vegetation ; voles ; Romania
    Language English
    Dates of publication 2015-1126
    Size p. 57-67.
    Publishing place De Gruyter Open
    Document type Article
    ISSN 1223-2254
    DOI 10.2478/travmu-2014-0006
    Database NAL-Catalogue (AGRICOLA)

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