Juvenile clam growth over 2 months in the field

Published: 1 March 2019| Version 1 | DOI: 10.17632/n96ywjhkpf.1
Megan Dethier


This spreadsheet shows initial and final sizes of juvenile Manila clams outplanted at 4 field sites in the inside waters of Washington state over 2 months in the summer of 2017. Clams of two different starting size classes were placed in windowscreen tubes filled with sediments at two elevations on the shore: 'high' at +1m MLLW, 'low' at +0.3m MLLW. Some tubes were 'open' to predators, others had a window-screen 'top' to exclude all predators. Some tubes had a mix of pebble and sand ('pebble'), others had crushed shell added to buffer porewater pH ('shell'). Each treatment combination was repeated 5 times (set A through E) along a 50m horizontal transect. Data show initial size (clams were dyed pink before outplanting), and final size of all surviving individuals (pink plus new white growth) after 2 months. Growth varied highly among individuals and sites, and less so among treatments and elevations.



Marine Ecology, Environmental Stress, Shellfish Farming