Here, you can find links to data sheets and Google forms for implementing:
a dependent double-observer survey using belt transects (double-observer belt survey)
a dependent double-observer distance survey (double-observer distance survey)
Transect data sheet: used to record information associated with the surveyed transects.
Habitat data sheet: used to record habitat data along the transect. These data can be used to model variation in mussel density.
Dependent double-observer belt survey: used to record observations of zebra mussels in dependent double-observer belt surveys.
Dependent double-observer distance survey: used to record observations of zebra mussels in dependent double-observer distance surveys.