Descrição
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.
Registros de Dados
Os dados deste recurso de ocorrência foram publicados como um Darwin Core Archive (DwC-A), que é o formato padronizado para compartilhamento de dados de biodiversidade como um conjunto de uma ou mais tabelas de dados. A tabela de dados do núcleo contém 69.542 registros.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versões
A tabela abaixo mostra apenas versões de recursos que são publicamente acessíveis.
Direitos
Pesquisadores devem respeitar a seguinte declaração de direitos:
O editor e o detentor dos direitos deste trabalho é University of Gdańsk. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
GBIF Registration
Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: 3c0f3e98-7def-4b8a-b1a1-80d3a9ce000f. University of Gdańsk publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Polish Biodiversity Information Network.
Palavras-chave
Occurrence; Observation
Contatos
- Provedor De Conteúdo ●
- Originador
- Provedor Dos Metadados ●
- Processador ●
- Ponto De Contato
https://orcid.org/https://orcid.org/0000-0002-3715-3866
Cobertura Geográfica
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.
| Coordenadas delimitadoras | Sul Oeste [50,259, 18,414], Norte Leste [54,441, 23,492] |
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Cobertura Taxonômica
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.
| Família | Viscaceae |
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Métodos de Amostragem
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.
| Área de Estudo | 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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| Controle de Qualidade | 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. |
Descrição dos passos do método:
- 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.
Metadados Adicionais
| Identificadores alternativos | https://ipt.gbif.pl/resource?r=viscum_album_gdansk_occurrence_2017-2025 |
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