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Iskalni niz: "avtor" (De Groot Maarten) .

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Species groups occupying different trophic levels respond differemtly to the invasion of semi-natural vegetation by Solidago canadensis
Maarten De Groot, David Kleijn, Jernej Jogan, 2007

Povzetek: We studied the impact of the invasive plant species Solidago canadensis on thespecies richness of vascular plants and the abundance, species richness anddiversity of butterflies, hoverflies and carabid beetles in herbaceous semi-natural habitats near Ljubljana, Slovenia. The species groups were sampled in sites dominated by 5. canadensis and paired nearby sites covered bysemi-natural vegetation. Plant species richness and species richness, abundance and diversity of butterfly species were lower in plots dominated by S. canadensis. Hoverfly abundance, diversity and species richness were negatively affected only in July just before the onset of flowering of S. canadensis, but tended to be positively affected in August during the height of flowering of S. canadensis. Only the abundance of carabid beetles was reduced in plots dominated by S. canadensis. The responses of the insect groups seem largely driven by the effects of Solidago on the availability of essential resources like food or larval host plants. Our results suggest that insect species that are closely related to plant species composition are more vulnerable to the effects of invasive plant species than those that are loosely or only indirectly related to plant species composition.
Ključne besede: Solidago Canadensis
DiRROS - Objavljeno: 12.07.2017; Ogledov: 983; Prenosov: 142
URL Celotno besedilo (0,00 KB)

Neevropski rilčkarji (Pissodes Spp.)
Maarten De Groot, 2017

Ključne besede: varstvo gozdov, karantenski organizmi
DiRROS - Objavljeno: 28.10.2017; Ogledov: 1518; Prenosov: 123
.pdf Celotno besedilo (170,82 KB)

Zlatopegasti krasnik (Agrilus auroguttatus)
Maarten De Groot, 2017

Ključne besede: varstvo gozdov, karantenski organizmi
DiRROS - Objavljeno: 03.12.2017; Ogledov: 1187; Prenosov: 122
.pdf Celotno besedilo (184,37 KB)

Predicting phenology of European beech in forest habitats
Primož Simončič, Mitja Skudnik, Ana Žust, Maarten De Groot, Urša Vilhar

Povzetek: Reliable phenological observations are important for studying the response of trees to climate and climate change. National phenological networks were not specifically established to monitor tree phenology within forests, yet they are often used to generalise tree phenological phases at national or regional scales. Our objective was to investigate whether a phenological monitoring network using trees in open areas can accurately predict phenology of European beech (Fagus sylvatica L.) located within forests by using two models: one with correlates of environmental variables and one with interpolated monthly air temperature and sun hours. The first leaf unfolding, general leaf colouring and leaf fall dates from 2004 through 2010 were modelled using data from 47 Slovene National Phenology Network (NPN) stations in open areas and tested on phenological observations within forests using data from the UNECE CRLTAP ICP Forests network. Good agreement was found between predicted and observed first leaf unfolding in the forest, while slightly lower agreement was detected for general leaf colouring and leaf fall. Suggestions for the improvement of national phenological network are discussed in order to better predict beech phenology in forest habitats.
Ključne besede: leaf unfolding, leaf colouring, leaf fall, modelling, Fagus sylvatica, Slovene National Phenology Network, ICP Forests
DiRROS - Objavljeno: 22.01.2018; Ogledov: 1150; Prenosov: 219

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