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5 results on '"Vahalik, P."'

1. Distribution and environmental impact of alien woody species in lowland riparian forest habitats: Case study in the protected areas of Georgia, South Caucasus

Author

Giorgi Kavtaradze, Lado Basilidze, Jan Pergl, Elizaveta Avoiani, Petr Vahalik, Besarion Aptsiauri, Nani Goginashvili, Margalita Bachilava, Zurab Manvelidze, and Nato Kobakhidze (email: n.

Subjects
conservation, environmental impact classification for alien taxa (eicat), exotic trees, invasion, Forestry, SD1-669.5
Abstract

Biological invasions are globally recognised as a significant threat to native biodiversity, as they can change the structure, composition, and functioning of the native ecological system. The riparian forest is considered a habitat highly invaded by invasive plants since rivers serve as corridors for alien species through the terrestrial ecosystem or may simply harbour exotic species that cannot survive elsewhere. The riparian forest, as a high conservation value forest, is an important part of the lowland forests of Georgia. These forests are distributed along large rivers, including the Mtkvari, Alazani, Iori, Aragvi, Ksani, Algeti, and Great and Little Liakhvi rivers. Here, we present a case study that was part of the scientific project titled 'Survey of Potential Invasive Alien Woody Species (PIAWS) in the Protected Areas of Georgia'. Protected areas (PAs) in Georgia play an important role in conserving native biodiversity, including forest ecosystems of distinguished biodiversity. We focused on the lowland riparian forest (LRF) distributed along the Mtkvari and Iori rivers within two PAs - Korugi and Gardabani Managed Reserves (MRs). Six main alien woody species (AWS) were identified in the study areas: Robinia pseudoacacia, Gleditsia triacanthos, Ailanthus altissima, Acer negundo, Amorpha fruticose and Morus alba. Among these AWS, the local status of R. pseudoacacia, G. triacanthos, A. altissima, and A. fruticosa is invasive, while that of A. negundo and M. alba is naturalised. The environmental impact of AWS on LRF habitat was evaluated using the Environmental Impact Classification for Alien Taxa (EICAT) classification system. A major or moderate impact of AWS on the LRF habitat is evident, which, according to EICAT impact mechanisms, is expressed as apparent competition and physical, structural and indirect impacts. The study revealed that the impact levels of three AWS, R. pseudoacacia, G. triacanthos, and A. altissima, were classified as major or moderate ('harmful' impact), while the remaining AWS, A. negundo and A. fruticosa, were of minor or minimal concern. AWS in the invaded areas of the LRF are found as an understorey layer or, otherwise, they have already formed the main canopy and replaced native dominant woody species. Therefore, undesirable structural and succession processes in invaded LRFs are evident.

Published
2023
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2. The increasing threat to European forests from the invasive foliar pine pathogen, Lecanosticta acicola

Author

Tubby, Katherine, Adamcikova, K., Adamson, K., Akiba, M., Barnes, I., Boron, P., Braganca, H., Bulgakov, T., Capretti, P., Cleary, Michelle, Davydenko, Kateryna, Elvira-Recuenco, M., Enderle, R., Gardner, J., Geogieva, M., Ghelardini, L., Husson, C., Iturritxa, E., Markovskaja, S., Mesanza, N., Ogris, N., Piskur, B., Queloz, V., Raitelaityte, K., Raposo, R., Soukainen, M., Strasser, L., Vester, M., Vahalik, P., and Mullett, Martin

Subjects
Ecology, Forest Science
Abstract

European forests are threatened by increasing numbers of invasive pests and pathogens. Over the past century, Lecanosticta acicola, a foliar pathogen predominantly of Pinus spp., has expanded its range globally, and is increasing in impact. Lecanosticta acicola causes brown spot needle blight, resulting in premature defoliation, reduced growth, and mortality in some hosts. Originating from southern regions of North American, it devastated forests in the USA's southern states in the early twentieth century, and in 1942 was discovered in Spain.Derived from Euphresco project 'Brownspotrisk,' this study aimed to establish the current distribution of Lecanosticta species, and assess the risks of L. acicola to European forests. Pathogen reports from the literature, and new/ unpublished survey data were combined into an open-access geo-database (http://www.portaloff orestpathology.com), and used to visualise the pathogen's range, infer its climatic tolerance, and update its host range. Lecanosticta species have now been recorded in 44 countries, mostly in the northern hemisphere. The type species, L. acicola, has increased its range in recent years, and is present in 24 out of the 26 European countries where data were available. Other species of Lecanosticta are largely restricted to Mexico and Central America, and recently Colombia.The geo-database records demonstrate that L. acicola tolerates a wide range of climates across the northern hemisphere, and indicate its potential to colonise Pinus spp. forests across large swathes of the Europe. Pre-liminary analyses suggest L. acicola could affect 62% of global Pinus species area by the end of this century, under climate change predictions.Although its host range appears slightly narrower than the similar Dothistroma species, Lecanosticta species were recorded on 70 host taxa, mostly Pinus spp., but including, Cedrus and Picea spp. Twenty-three, including species of critical ecological, environmental and economic significance in Europe, are highly susceptible to L. acicola, suffering heavy defoliation and sometimes mortality. Variation in apparent susceptibility between reports could reflect variation between regions in the hosts' genetic make-up, but could also reflect the signif-icant variation in L. acicola populations and lineages found across Europe. This study served to highlight sig-nificant gaps in our understanding of the pathogen's behaviour.Lecanosticta acicola has recently been downgraded from an A1 quarantine pest to a regulated non quarantine pathogen, and is now widely distributed across Europe. With a need to consider disease management, this study also explored global BSNB strategies, and used Case Studies to summarise the tactics employed to date in Europe.

Published
2023

3. Quality of care to nursing home residents with incontinence.

Author

Harrison, Tracie, Blozis, Shelley, Manning, Amelia, Dionne-Vahalik, Michelle, and Mead, Sharilyn

Abstract

Quality of care for residents with urinary incontinence (UI) living in nursing facilities was analyzed using data collected from 815 facilities for the Nursing Facility Quality Review in Texas. Overall, of the 1,560 residents, 48.4% (n = 755) experienced UI. The risk of developing UI over a ten-year-period in a nursing facility was 6%. Only 54% of residents with UI had a care plan for their incontinence. For those with a UI plan in their chart, 143 (35%) had a person entered UI plan developed based on that resident's voiding pattern and needs. Further, the creation of a UI plan of care by a RN for a person with UI was associated with a higher perceived level of health after controlling for gender, and age. Finally, the more satisfied the resident was with the response to their calls for help with voiding the more satisfied with the nursing facility. [ABSTRACT FROM AUTHOR]

Published
2019
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