NOTES Barshaw and Able: Effect of tethering on predatlon rates of Homarus amencanus 



417 



gators did not observe any differences in the beiiavior 

 of crabs tethered in different substrates. The differ- 

 ences in tethering effects between these investigations 

 and ours are probably due to the fact that Homarus 

 americanus construct burrows in the substrate while 

 the crabs used in the above tethering experiments 

 simply bury themselves directly into the substrate. 



The results of this study suggest that tethering to 

 assess predation in different habitats should be evalu- 

 ated for each new species under consideration because 

 species-specific behavior patterns could create habitat- 

 specific tethering artifacts. In particular, caution 

 should be used when interpreting survival rates of 

 lobsters in mud relative to other substrates. Similar 

 caution should be considered when tethering is used 

 to assess predation in other burrowing forms. 



Acknowledgments 



We thank Donald Bryant-Rich, Dan Roelke, and Steve 

 Weiss for help in collecting substrates and making 

 observations. Mike Syslo and Kevin Johnson from the 

 Martha's Vineyard State Lobster Hatchery and Kari 

 Lavalli provided us with juvenile lobsters. Support for 

 this study was provided by a minigrant from the New 

 Jersey Marine Sciences Consortium. 



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