10.25607/s8k2pg 10.15468/sp8a4a 612f8af6-9fd2-415b-a957-63ff1ba6ba88 http://ipt.medobis.eu/resource?r=macrosoft Panayota Koulouri Hellenic Center for Marine Research Research Director

GREECE

yol72@hcmr.gr Eleni Koumpaki Hellenic Center for Marine Research Research Technician (MSc)

GREECE

e.koumpaki@hcmr.gr Maria Maidanou Hellenic Center for Marine Research Research Technician (PhD)

GREECE

mariam@hcmr.gr Georgios Chatzigeorgiou Hellenic Center for Marine Research Research Technician (PhD)

GREECE

chatzigeorgiou@hcmr.gr Christos Arvanitidis LifeWatch ERIC CEO

SPAIN

ceo@lifewatch.eu Costas Dounas Artificial Reef Innovative Applications Principal Investigator

GREECE

kdounas@hcmr.gr Panayota Koulouri Hellenic Center for Marine Research Research Director

GREECE

yol72@hcmr.gr Eleni Koumpaki Hellenic Center for Marine Research Research Technician (MSc)

GREECE

e.koumpaki@hcmr.gr Panayota Koulouri Hellenic Center for Marine Research Research Director

GREECE

yol72@hcmr.gr PRINCIPAL_INVESTIGATOR Eleni Koumpaki Hellenic Center for Marine Research Research Technician (MSc)

GREECE

e.koumpaki@hcmr.gr AUTHOR Maria Maidanou Hellenic Center for Marine Research Research Technician (PhD)

GREECE

mariam@hcmr.gr CONTENT_PROVIDER Georgios Chatzigeorgiou Hellenic Center for Marine Research Research Technician (PhD)

GREECE

chatzigeorgiou@hcmr.gr CONTENT_PROVIDER Ioannis Rallis Hellenic Center for Marine Research Research Associate (MSc) / Data manager

GREECE

i.rallis@hcmr.gr https://www.researchgate.net/profile/Ioannis-Rallis-3 CUSTODIAN_STEWARD Dimitra Mavraki HCMR-IMBBC Data manager

Thalassocosmos, Former American Base Heraklion Crete 71003 GREECE

dmavraki@hcmr.gr https://imbbc.hcmr.gr/ 0000-0001-6775-530X CUSTODIAN_STEWARD Christos Arvanitidis LifeWatch ERIC CEO

SPAIN

ceo@lifewatch.eu AUTHOR Costas Dounas Artificial Reef Innovative Applications Principal Investigator

GREECE

kdounas@hcmr.gr CONTENT_PROVIDER 2025-10-03 ENGLISH This dataset includes species composition and abundances of macrobenthic faunal communities along three transects of Heraklion Bay (H2, H5, H7). The H2 transect is located in the wider marine area of the wastewater treatment plant of Heraklion city. Sampling was carried out during three different sampling surveys and periods — June 2010, June 2015, and August 2024 — at different depths (10, 20, 30, 40, 50, 100 and 200 m) along the soft-bottom continental shelf, as part of different research projects (MARBEFES, Marine Biology, Biotechnology & Aquaculture, monitoring program). A detailed comparison of species composition and abundance of macrobenthic faunal diversity among different depths and sampling periods is given, thus contributing to understanding the spatial and temporal trends and changes due to multiple environmental and human-induced stress. macrobenthos n/a Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml soft-bottom n/a long-term monitoring n/a bathymetric distribution n/a Mediterranean https://www.marineregions.org/gazetteer.php?p=details&id=5217 Cretan Sea Heraklion Bay Marine Regions Gazetteer This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License . Creative Commons Attribution 4.0 International https://spdx.org/licenses/CC-BY-4.0.html CC-BY-4.0 http://ipt.medobis.eu/archive.do?r=macrosoft Three transects of seven stations (10, 20, 30, 40, 50 100 and 200 m depth) were selected as a study site. The first two stations of H2 transect are located close to the marine area of the wastewater treatment plant of Heraklion city. The selection criteria for the specific stations were primarily based on the available data from different research projects and studies performed during previous years in order to investigate the bathymetric distribution of macrobenthic faunal communities in the wider marine area of the wastewater treatment plant of Heraklion city and along the continental shelf of Heraklion Bay (sampling surveys in June 2010 and 2015 within the framework of the monitoring program for the wastewater treatment plant of Heraklion city and Marine Biology, Biotechnology & Aquaculture, respectively). 24.931 25.486 35.541 35.28 2010-06-18 2015-06-16 2024-08-03 2024-08-05 The dataset includes information on macrobenthic faunal taxa identified and their abundance found in the stations of the three sampling periods (June 2010, June 2015 and August 2024) belonging to the following five classes: Bivalvia, Gastropoda, Malacostraca, Polychaeta, Scaphopoda. Class Bivalvia Class Gastropoda Class Malacostraca Class Polychaeta Class Scaphopoda unkown Panayota Koulouri Hellenic Center for Marine Research Research Director

GREECE

yol72@hcmr.gr 1) Macrofauna June 2010 (H2): five replicates per station June 2015 (H2) & August 2024 (H2): three replicates per station 2) Water Column Analysis June 2015 (H2): One replicate per station at the surface (2 m depth) and one near the bottom (1 m above the sediment). Parameters: photosynthetic pigments, organic carbon, and nutrients August 2024 (H2): One replicate per station at the surface (2 m depth) and one near the bottom (1 m above the sediment). Parameters: photosynthetic pigments, organic carbon, and nutrients August 2024 (H5, H7): One replicate per station near the bottom (1 m above the sediment). Parameters: photosynthetic pigments, organic carbon, and nutrients 3) CTD Profiling In situ measurements of temperature, salinity, dissolved oxygen, and photosynthetically active radiation (PAR) 4) Sediment Analysis June 2010 (H2): three replicates per station. Parameters: granulometry, photosynthetic pigments, organic carbon June 2015 (H2): three replicates per station. Parameters: granulometry, photosynthetic pigments, organic carbon August 2024 (H2, H5, H7): one replicate per station. Parameters: granulometry, photosynthetic pigments, organic carbon and in situ measurements of redox potential and temperature, Three transects (H2,H5,H7) of seven stations (10, 20, 30, 40, 50 100 and 200 m depth) were selected as a study site. The first two stations of H2 transect are located close to the marine area of the wastewater treatment plant of Heraklion city. The selection criteria for the specific stations were primarily based on the available data from different research projects and studies performed during previous years in order to investigate the bathymetric distribution of macrobenthic faunal communities in the wider marine area of the wastewater treatment plant of Heraklion city and along the continental shelf of Heraklion Bay (sampling surveys in June 2010 and 2015 within the framework of the monitoring program for the wastewater treatment plant of Heraklion city and Marine Biology, Biotechnology & Aquaculture, respectively). Three or five replicates of sediment samples were collected from each station using a Smith McIntyre grab (SMI, sampling surface: 0.1 m²) operated by the research vessel “PHILIA” of the Hellenic Centre for Marine Research. The position of each station was calculated using a FURUNO SFN-70 satellite navigator and depth was measured by SIMRAD K-400 echo sounder. In the field, the samples were sieved through a 0.5 mm sieve and preserved in 95% ethanol buffered with seawater. In the laboratory, they were rinsed again through a 0.5 mm sieve to remove any remaining fine sediment. Benthic organisms were then sorted from the sediment under a magnifying glass and then counted and identified to the lowest possible taxonomic level using a stereoscope and a microscope. All scientific names were standardized against the World Register of Marine Species using the Taxon Match tool (http://www.marinespecies.org/aphia.php?p=match) on 20-07-2025. Panayota Koulouri PRINCIPAL_INVESTIGATOR Eleni Koumpaki AUTHOR Maria Maidanou CONTENT_PROVIDER Georgios Chatzigeorgiou CONTENT_PROVIDER Ioannis Rallis CUSTODIAN_STEWARD Dimitra Mavraki CUSTODIAN_STEWARD Christos Arvanitidis AUTHOR Costas Dounas CONTENT_PROVIDER This study has been financed under: the HEurope research and innovation programme HORIZON-CL6-2021-BIODIV-01-03 in the framework of the project “Marine Biodiversity and Ecosystem Functioning leading to Ecosystem Services” (Grant Agreement no 101060937); the Operational Programme of “Competitiveness & Entrepreneurship” of the National Strategic Reference Framework (NSRF 2007-2013) in the framework of the project “Marine Biology, Biotechnology & Aquaculture” (MIS 453278) by Greece and the European Union (European Regional Development Fund); the monitoring program of the wastewater treatment plant of Heraklion city by the Municipal water supply and sewage company of Heraklion. This publication has been supported by LifeWatch ERIC. H2 transect, Heraklion (Crete, Greece) During this study, differences in macrobenthic communities were examined across two levels: a) temporal differences (three sampling periods) and b) bathymetric differences (seven depth stations). 2026-04-14T08:23:42Z Koulouri P, Koumpaki E, Maidanou M, Chatzigeorgiou G, Arvanitidis C, Dounas C (2025). Bathymetric distribution and temporal trends of macrobenthic communities of the continental shelf of Heraklion Bay (Crete-Greece). Version 2.1. Hellenic Center for Marine Research. Sampling event dataset https://doi.org/10.25607/s8k2pg accessed via GBIF.org on 2026-04-14. http://ipt.medobis.eu/logo.do?r=macrosoft Bathymetric distribution and temporal trends of macrobenthic communities of the continental shelf of Heraklion Bay (Crete-Greece) ALCOHOL