說明
This dataset contains sessile benthic coverage data derived from photographic quadrat samples collected in two time periods (2008–2009 and 2024) at two coastal sites in Northern Crete: Alykes (Heraklion) and Elounda Bay (Agios Nikolaos). Sampling was conducted along two transects per site at five depths (1 m, 5 m, 10 m, 15 m, and 20 m), using two quadrat sizes (25×25 cm and 100×100 cm) to capture replicate images. The data offer valuable insights into temporal shifts in sessile organism communities, highlighting changes potentially linked to climate change and the increasing presence of invasive herbivorous fish species, such as siganid fish and diademid sea urchins.
資料紀錄
此資源sampling event的資料已發佈為達爾文核心集檔案（DwC-A），其以一或多組資料表構成分享生物多樣性資料的標準格式。 核心資料表包含 587 筆紀錄。
亦存在 2 筆延伸集的資料表。延伸集中的紀錄補充核心集中紀錄的額外資訊。 每個延伸集資料表中資料筆數顯示如下。
此 IPT 存放資料以提供資料儲存庫服務。資料與資源的詮釋資料可由「下載」單元下載。「版本」表格列出此資源的其它公開版本，以便利追蹤其隨時間的變更。
版本
以下的表格只顯示可公開存取資源的已發布版本。
如何引用
研究者應依照以下指示引用此資源。:
Rallis I, Chatzigeorgiou G, Skouradakis G, Vernadou E, Polychroni T, Pavlidis D, Papagiannopoulos G, Dailianis T (2025). Sessile Benthic Assemblages in Northern Crete assessed from Photographic Quadrats (2008–2024). Institute of Marine Biology, Biotechnology and Aquaculture - Hellenic Centre for Marine Research, Greece. Dataset.
權利
研究者應尊重以下權利聲明。:
此資料的發布者及權利單位為 Hellenic Center for Marine Research。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF 註冊
此資源尚未向GBIF註冊
關鍵字
Sessile; Epibenthic; Benthos; Reefs; Samplingevent; Eastern Mediterranean; Aegean Sea; Biodiversity Shifts; Sublittoral; Hard Substrate
聯絡資訊
- 託管人
- 元數據提供者 ●
- 連絡人
- 託管人
- 託管人
https://orcid.org/https://orcid.org/0000-0001-6775-530X
- 託管人
地理涵蓋範圍
Two areas in Northern Crete, Alykes and Elounda
| 界定座標範圍 | 緯度南界 經度西界 [35.25, 24.97], 緯度北界 經度東界 [35.42, 25.76] |
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分類群涵蓋範圍
Functional Groups: Bivalvia, Erect Chlorophyta, Massive Sponge, Hexacorallia, Mobile Fauna, Mucilage-forming Microalga, Barnacles, Boring Sponges, Massive Chlorophyta, Massive Phaeophyceae, Canopy, Colonial Ascidian, Calcareous Erect Algae, Erect Rhodophyta, Encrusting Sponge, Solitary Ascidian, Encrusting Rhodophyta, Erect Bryozoa, Padina pavonica, Encrusting Chlorophyta, Encrusting Bryozoa, Encrusting Habitat-forming Rhodophyta, Tube-forming Polychaeta
| Phylum | Porifera (Sponges), Mollusca (Mollusks), Chlorophyta (Green algae), Rhodophyta (Red algae), Ochrophyta (Brown algae), Cnidaria |
|---|---|
| Class | Ascidiacea (Sea squirts), Polychaeta (Scale worms) |
| Subclass | Cirripedia (Barnacles) |
時間涵蓋範圍
| 起始日期 / 結束日期 | 2008-06-01 / 2024-06-30 |
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計畫資料
MARine Biodiversity and Ecosystem Functioning leading to Ecosystem Services MARBEFES project has received funding from the European Union’s Horizon Europe research and innovation programme under Grant Agreement no 101060937
| 計畫名稱 | MARBEFES |
|---|---|
| 辨識碼 | https://marbefes.eu/ |
| 經費來源 | This Project has received funding from the European Union’s Horizon Europe research and innovation programme under grant agreement no 101060937 |
| 研究區域描述 | The MARBEFES project is structured around the concept that biodiversity is a continuous and interconnected system across space and time, beyond traditional boundaries like ‘estuary,’ ‘coast,’ and ‘offshore.’ This approach helps to avoid compartmentalized thinking that might limit our understanding of marine ecosystems. MARBEFES explicitly considers the river-to-ocean gradient, utilizing 12 Broad Belt Transects (BBTs) across the four main marine regions of the EU – the Arctic, Baltic, Atlantic, and Mediterranean. These transects serve as the core of MARBEFES research, providing data to understand biodiversity trends and their impacts across Europe. |
取樣方法
Sampling was conducted through non-destructive underwater photographic surveys of fixed-area quadrats. Two permanent transects were established in each study area (Alykes and Elounda) and sampled at five depths (1, 5, 10, 15, and 20 meters) during spring seasons of 2008, 2009, and 2024. At each depth, five photographic quadrats (either 25×25 cm or 100×100 cm) were positioned along the transects on hard substrates. Each image was later analysed using a stratified point count method with 100 randomly distributed points per photo to estimate the percent cover of sessile macrobenthic taxa.
| 研究範圍 | The study was conducted in northern Crete, specifically in the coastal areas of Alykes and Elounda. Sampling took place during the spring seasons of 2008, 2009, and 2024, with two transects surveyed per site each year across five depth zones (1, 5, 10, 15, and 20 meters). The study focuses on hard substrate habitats and is representative of typical rocky reef environments in the eastern Mediterranean. |
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| 品質控管 | Quality control began with structuring the data into a tidy format and applying Darwin Core standards. Taxonomic names were validated via the WoRMS Taxon Match Tool, which uses exact and fuzzy matching to assign AphiaIDs, authorities, and classification metadata. Geographic coordinates were visually inspected using the OBIS Map Tool, generating WKT geometries and calculating centroids and uncertainty radii to confirm sampling locations in marine zones and identify outliers. The dataset then underwent comprehensive QC using the LifeWatch/EMODnet Biology Biocheck tool, which assesses schema compliance, taxonomy, spatial consistency, occurrence and measurement records against EMODnet standards. Finally, metadata were created and published via the MedOBIS IPT, facilitating dataset exposure to OBIS/GBIF and enabling harvesting by international repositories. |
方法步驟描述:
- Photographic sampling was conducted during spring surveys in 2008, 2009, and 2024 at two coastal locations in northern Crete (Alykes and Elounda). At each site, two transects were established and surveyed at five fixed depths (1, 5, 10, 15, and 20 meters). Photoquadrats (25×25 cm or 100×100 cm) were positioned on hard substrates and photographed using underwater digital cameras equipped with scale frames. Images were later analysed using the stratified random point count method (100 points per quadrat), following established benthic assessment protocols. Data were digitised into a tidy format and standardised using Darwin Core terminology. Taxonomic names were matched to authoritative AphiaIDs using the WoRMS Taxon Match Tool. Coordinates were validated using the OBIS Maptool. Quality control was performed using the LifeWatch/EMODnet Biology RShiny tool, and final metadata were prepared and published via the MedOBIS IPT following OBIS data publishing standards.
額外的詮釋資料
| 替代的識別碼 | 10.25607/meaq9b |
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| https://ipt.medobis.eu/resource?r=sessile-benthos-alykes-elounda-2008-2024 |