Dataset

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

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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.

Citation: 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.

Published: August 18, 2025 at 09:08

URL: http://ipt.medobis.eu/resource?r=sessile-benthos-alykes-elounda-2008-2024

Ioannis Rallis
Institute of Marine Biology, Biotechnology and Aquaculture - Hellenic Centre for Marine Research (IMBBC-HCMR)

Thanos Dailianis
Institute of Marine Biology, Biotechnology and Aquaculture - Hellenic Centre for Marine Research (IMBBC-HCMR)

Dimitra Mavraki
HCMR-IMBBC

Melina Loulakaki
HCMR-IMBBC

2,334
occurrence records
2,430
measurements and facts
65
taxa
36
species

Taxa

Missing and invalid fields

Field Missing Invalid
coordinateUncertaintyInMeters 2,334
100.0%

Quality flags

The OBIS data quality flags are documented at https://github.com/iobis/obis-qc.

Flag Dropped Records
DEPTH_EXCEEDS_BATH 1,245
53.3%
NO_ACCEPTED_NAME 792
33.9%
ON_LAND 364
15.6%

Measurement types

DNA derived data