CREATE TABLE table_80173 ("Election" TEXT, "1st Member" TEXT, "1st Party" TEXT, "2nd Member" TEXT, "2nd Party" TEXT)

What was the 1st Member when the 1st Party had its representation reduced to one member?
SELECT "1st Member" FROM table_80173 WHERE "1st Party" = 'representation reduced to one member'
SELECT "1st Member" FROM "table_80173" WHERE "1st Party" = 'representation reduced to one member'