Fertilization rates of intra- and interspecific crosses performed in 2007 and 2012.

Roman numbers mean combinations of crosses; I for A. florida eggs × A. florida sperm, II for A. intermedia eggs × A. intermedia sperm, III for A. florida eggs × A. intermedia sperm, IV for A. intermedia eggs ×A. florida sperm, V for A. sp. “int-flo” eggs × A. florida sperm, VI for A. florida eggs × A. sp. “int-flo” sperm, VII for A. sp. “int-flo” eggs × A. intermedia sperm, VIII for A. intermedia eggs × A. sp. “int-flo” sperm. For intraspecific crosses (I, II), total number of colonies we used is shown, and for interspecific crosses (III–VIII), total colony numbers for eggs and for sperm are shown respectively. Values of average (Ave), and minimum (Min) and maximum (Max) fertilization rates (FR) are shown by %. Combinations (I–VIII) that significantly differed by all pairwise multiple comparisons (see Results) were shown in bottom. nd means “not detected”. SD means standard deviation.