説明
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.
データ レコード
この オカレンス（観察データと標本) リソース内のデータは、1 つまたは複数のデータ テーブルとして生物多様性データを共有するための標準化された形式であるダーウィン コア アーカイブ (DwC-A) として公開されています。 コア データ テーブルには、69,542 レコードが含まれています。
この IPT はデータをアーカイブし、データ リポジトリとして機能します。データとリソースのメタデータは、 ダウンロード セクションからダウンロードできます。 バージョン テーブルから公開可能な他のバージョンを閲覧でき、リソースに加えられた変更を知ることができます。
バージョン
次の表は、公にアクセス可能な公開バージョンのリソースのみ表示しています。
権利
研究者は権利に関する下記ステートメントを尊重する必要があります。:
パブリッシャーとライセンス保持者権利者は University of Gdańsk。 This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
GBIF登録
このリソースをはGBIF と登録されており GBIF UUID: 3c0f3e98-7def-4b8a-b1a1-80d3a9ce000fが割り当てられています。 Polish Biodiversity Information Network によって承認されたデータ パブリッシャーとして GBIF に登録されているUniversity of Gdańsk が、このリソースをパブリッシュしました。
キーワード
Occurrence; Observation
連絡先
- データ提供者 ●
- 最初のデータ採集者
- メタデータ提供者 ●
- データ処理者 ●
- 連絡先
https://orcid.org/https://orcid.org/0000-0002-3715-3866
地理的範囲
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.
| 座標（緯度経度） | 南 西 [50.259, 18.414], 北 東 [54.441, 23.492] |
|---|
生物分類学的範囲
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 |
|---|
収集方法
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.
| Study Extent | 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. |
|---|---|
| Quality Control | 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. |
Method step description:
- 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.