Description
The dataset contains records of the common mistletoe (Viscum album L.) in the urban environment of Gdańsk (northern Poland), collected during long-term field surveys conducted since 2017 in successive districts of the city. The study has an inventory-based character and focuses on the distribution of mistletoe and the identification of its host plants. The geographic scope of the dataset is being gradually expanded to include additional districts of Gdańsk.
For each colonized tree or shrub, the location, taxonomic identity of the host, and abundance of mistletoe were recorded. Observations were conducted mainly during the winter period, when the parasite was most visible on leafless trees, while host identification was supplemented during subsequent phases of the growing season.
The dataset documents relationships between mistletoe and its hosts across different types of urban environments and may provide a basis for studies on the species’ ecology, host preferences, and the influence of urbanization on mistletoe distribution.
Enregistrements de données
Les données de cette ressource occurrence ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 69 542 enregistrements.
Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées de la ressource sont disponibles pour téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.
Versions
Le tableau ci-dessous n'affiche que les versions publiées de la ressource accessibles publiquement.
Droits
Les chercheurs doivent respecter la déclaration de droits suivante:
L’éditeur et détenteur des droits de cette ressource est University of Gdańsk. Ce travail est sous licence Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0.
Enregistrement GBIF
Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 3c0f3e98-7def-4b8a-b1a1-80d3a9ce000f. University of Gdańsk publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du Polish Biodiversity Information Network.
Mots-clé
Occurrence; Observation
Contacts
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https://orcid.org/https://orcid.org/0000-0002-3715-3866
Couverture géographique
The study was conducted in Gdańsk, a city located in northern Poland on the coast of the Gulf of Gdańsk. The surveyed area included successive districts representing different types of urban environments, including historic urban areas, residential districts, industrial and harbour areas, roadside greenery, parks, allotment gardens, and single-family housing areas. Between 2017 and 2025, surveys were conducted in the following districts of Gdańsk: Aniołki, Brętowo, Brzeźno, Chełm, Jelitkowo, Letnica, Matemblewo, Młyniska, Nowy Port, Oliwa, Orunia Górna–Gdańsk Południe, Piecki-Migowo, Przymorze Małe, Przymorze Wielkie, Siedlce, Strzyża, Suchanino, Śródmieście, Święty Wojciech, Ujeścisko-Łostowice, VII Dwór, Wrzeszcz Dolny, Wrzeszcz Górny, Wzgórze Mickiewicza, Zaspa Młyniec, Zaspa Rozstaje, and Żabianka. The geographic scope of the study is being gradually expanded to include additional districts of the city.
| Enveloppe géographique | Sud Ouest [50,259, 18,414], Nord Est [54,441, 23,492] |
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Couverture taxonomique
The study focused on the common mistletoe: Viscum album L. Host plants (trees and shrubs) colonized by the parasite were also recorded. These represent a wide range of deciduous woody taxa occurring in urban green spaces of Gdańsk, belonging to multiple plant families commonly found in the city’s urban tree and shrub vegetation.
| Family | Viscaceae |
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Méthodes d'échantillonnage
Data were collected during long-term field surveys conducted since 2017, primarily in winter (January–March), when the common mistletoe (Viscum album L. subsp. album) is most easily detectable on deciduous, leafless trees. For each tree or shrub colonized by mistletoe, the location, taxonomic identity of the host, and number of mistletoe clumps were recorded. In cases of heavily infested trees, counts were repeated from different observation points, often using binoculars to improve accuracy. Locations were recorded in verbatim form, including street names, descriptive locality information, and assignment to city districts. Geographic coordinates (GPS) were subsequently derived from these descriptions using automated georeferencing (geocoding) tools. The resulting coordinates were verified against base maps to ensure spatial accuracy. Host identification in winter was often limited to genus or family level and was later refined during the growing season based on morphological features of leaves, flowers, and fruits.
| Etendue de l'étude | The study was conducted in the city of Gdańsk (northern Poland), located on the coast of the Gulf of Gdańsk. The surveyed area included a variety of urban environments, such as historic city districts, residential areas, industrial and harbour zones, roadside greenery, urban parks, allotment gardens, and single-family housing areas. The geographic scope included successive districts of the city, and the study area was gradually expanded over the course of the research period. |
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| Contrôle qualité | Host plant identification was conducted in multiple stages. During winter surveys, identification was frequently limited to genus or family level, while more precise species-level identification was carried out during the growing season. Taxonomic identification was based on standard floristic keys and taxonomic references (including Rutkowski 2004; Seneta & Dolatowski 2000; Mirek et al.). In some cases, particularly in areas with limited access, host identification may have been indirect or estimated. Taxonomic names were reviewed and standardized according to current botanical nomenclature to ensure consistency with modern taxonomic frameworks and interoperability with other biodiversity datasets. Mistletoe abundance per host individual was estimated in the field, and repeated counts were performed in cases of dense infestations to reduce observational error. |
Description des étapes de la méthode:
- Data were collected as part of systematic field inventories conducted across successive districts of Gdańsk. Each host tree or shrub colonized by mistletoe was assigned a unique field identifier, and its location was recorded in verbatim form and plotted on working maps.
- Based on these descriptive records, geographic coordinates were assigned through georeferencing using automated geocoding tools. This process enabled the transformation of descriptive locality data into spatially explicit records compliant with GBIF standards. The resulting coordinates were subsequently validated using base maps.
- For each host individual, its taxonomic affiliation and the number of mistletoe individuals were recorded.
- In parallel with the database development, cartographic and analytical documentation was prepared during successive years of research in the form of written reports. These materials included working maps and preliminary spatial analyses and are not part of the dataset itself, but serve as its scientific supplementary documentation.
Métadonnées additionnelles
| Identifiants alternatifs | https://ipt.gbif.pl/resource?r=viscum_album_gdansk_occurrence_2017-2025 |
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