Converse of object

• select: The randomly selected tetrads are also to be surveyed in January 2005.

• survey: A total of 97 % of the tetrads surveyed in 1998 had also been covered in 1987.

• occupy: No gone from many tetrads occupied in the Essex Breeding Atlas.

• call: All pollen grains develop initially in groups of four called tetrads.

Adjective modifier

• many: No gone from many tetrads occupied in the Essex Breeding Atlas.

• new: During that season ( from October to March ), the presence of harvest mice was confirmed in 106 new tetrads!

Modifies a noun

• survey: Figures in italics are derived from the tetrad survey.

• distribution: Many counties have published tetrad distribution maps of various groups - Worcestershire none.

• map: The atlas is provided with tetrad maps produced by the Records Center.

• level: The data are only fully comprehensive at the 10-km square level and not at the tetrad level.

• record: Most have proved to be new tetrad records and some have been new to that ten km square.