fiddler crab

Fiddler crab body size in salt marshes from Florida to Massachusetts, USA at PIE and VCR LTER and NOAA NERR sites during summer 2016.


Bergmann’s rule predicts that organisms at higher latitudes are larger than ones at lower latitudes. Here, we examine the body-size pattern of the Atlantic fiddler crab, Minuca (=Uca) pugnax, from salt marshes on the east coast of the United States across 12 degrees of latitude. We found that M. pugnax followed Bergmann’s rule and that, on average, crab carapace width increased by 0.5 mm per degree of latitude. Minuca pugnax body size also followed the temperature-size rule with body size inversely related to mean water temperature. Because an organism’s size influences its impact on an ecosystem, and Minuca pugnax is an ecosystem engineer that affects marsh functioning, the larger crabs at higher latitudes may have greater per-capita impacts on salt marshes than the smaller crabs at lower latitudes.


Core Areas: 

Data set ID: 



Short name: 


Data sources: 



We collected ~30 male, adult Minuca pugnax from thirteen marshes from  Florida to Massachusetts and measured their carapace width with calipers. Water and air temperature data were collected from long-term monitoring programs (such as those from Long Term Ecological Research sites LTERs) and from public weather stations.


Version 01: November 20, 2019, data and metadata updates to comply with importation to DEIMS7 and LTER Data Portal. Used MarcrosExportEML_HTML (working)pie_excel2007_Sep2019.xlsm 9/3/19 5:19 PM for QA/QC to EML 2.1.0.

Subscribe to RSS - fiddler crab