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Which grab type would you suggest for sampling marine benthic macroinvertebrates in sandy substrate or maerl? We would like to use it in coastal samplings, often in recreational boats carrying a small winch, by one or two people. So, it shouldn’t be very heavy, and the ideal surface would be around 0.05m2.
In our lab we have a 30-years old Ponar grab (9”x9”) that needs to be replaced. Every time we tried using this specific grab, it had serious issues sampling sufficiently any substrate than mud. In muddy sediments it was capable to collect almost full volumes of samples. However, both in the description from Wildco and references (e.g. Elliot & Drake, 1981), Ponar grab is suggested as the ideal type for sampling coarse material. So, I wonder if the issues in our Ponar are due to old age or maybe poor maintenance.
Has any of you had trouble sampling coarse material with a Ponar grab? Would you suggest another type for this substrate?
Thank you in advance for any suggestions.