IMIS

Sessile Benthic Assemblages in Northern Crete assessed from Photographic Quadrats (2008–2024)

Citatie

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. https://marineinfo.org/doc/dataset/8884

Contact: Dailianis, S. ;

Toegang tot data

Gearchiveerde data

Beschikbaarheid:

Deze dataset valt onder een Creative Commons Naamsvermelding 4.0 Internationaal-licentie.

Beschrijving

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. meer

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.

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.

Afstamming

Prior to publication data undergo quality control checked which are described in https://github.com/EMODnet/EMODnetBiocheck?tab=readme-ov-file#understanding-the-output

Scope

Thema's:

Biologie > Benthos

Kernwoorden:

Marien/Kust · Benthos · Biogeografische gebieden · Biota · Epibenthos · Geen beperkingen op publieke toegang · Geowetenschappelijke informatie · Habitats en biotopen · MED, Aegean · MED, Eastern Mediterranean · Metadata niet conform · Metadata niet gecontroleerd · Milieu · Oceanen · Riffen · Sessile organisms · Sublittoral zone · WGS84 (EPSG:4326) · XYZ ASCII · Zeegebieden · EurOBIS calculated BBOX · Crete Sea · Ascidiacea · Chlorophyta · Cirripedia · Cnidaria · Mollusca · Ochrophyta · Polychaeta · Porifera · Rhodophyta

Geografische spreiding

EurOBIS calculated BBOX Stations

Bounding Box
Coördinaten: MinLong: 24,9876; MinLat: 35,2506 - MaxLong: 25,7589; MaxLat: 35,4158 [WGS84]

Crete Sea [Marine Regions]

Spreiding in de tijd

1 Juni 2008 - 30 Juni 2024

Taxonomic coverage

Ascidiacea [WoRMS]

Chlorophyta [WoRMS]

Cirripedia [WoRMS]

Cnidaria [WoRMS]

Mollusca [WoRMS]