Marine Invertebrates

    The rocky reef habitat of Israeli coastline rich and diverse, and abundant in marine resources. It functions as a stable habitat to alga, invertebrates, and fish. We aim to initiate a long-term ecological research (LTER) program. We started to work on the Mediterranean rocky reefs in 2014 and established a methodical working method since 2015. We started the reefs of Achziv, Naharia, and Sdot Yam at three different depth levels (10, 25 and 45 meters), and later on in 2016 we stopped collecting data on Naharia 10 &25 meters however we started collecting data on Ashdod and Ashkelon at 30 meters depth. We collect community and coverage data on invertebrates and alga. We intend to follow changes in space and time at our coastline. We hope that this knowledge will encourage researchers to investigate this habitat and will serve as a good baseline for further research, to enhance our knowledge of the marine ecosystem and apply this towards effective policy in Israel.

    Photo survey

    We collect photo-quadrats (25 cm2) which are taken every 2 m’ along a 25 m transect line. We are conducting 4 transects at each site. The photos are taken with Canon G1X with 2 external flash Ikelite DS51. All photos are uploaded to the Coralnet website for analysis. We utilize a stratified random annotation point generator - 4 rows x 4 columns of cells, 1 point per cell, for a total of 16 points. The photos are automatically annotated regarding substrate coverage, functional grouping, and taxa. Regarding taxa, if the confidence level of machine recognition is higher than 90%, it is automatically recorded. The remaining points are analyzed and manually entered. The source photos and point data is open to the public at CoralnNet.

    Present/Absent survey

    Due to the limitation of the method we complete our survey with a 10 min survey were we note each sessile invertebrate once regardless of its coverage. That gives us a more complete species list per monitored site.

    Contact us

    For more information and assistance on this data, please contact:

    Hagai Nativ

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