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Variation of reproductive success in a haplo‐diploid Red Alga, Gracilaria Verrucosa : effects of parental identities and crossing distance
Author(s) -
Richerd Sophie,
Destombe Christophe,
Cuguen Joël,
Valero Myriam
Publication year - 1993
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1993.tb15382.x
Subject(s) - biology , inbreeding depression , ploidy , inbreeding , heterosis , population , genetic divergence , outbreeding depression , genetic distance , zoology , gracilaria , divergence (linguistics) , demography , genetic variation , ecology , botany , genetics , algae , genetic diversity , gene , hybrid , linguistics , philosophy , sociology
The factors influencing reproductive success in a haplo‐diploid marine alga, Gracilaria verrucosa , have been determined through single‐male crosses in the laboratory. Crossing success was assessed by measuring its early components, fertility, and abortion rate. The effects of the male or female parent identity, of the male × female interaction, and of the geographical distance between mates were tested in crosses within or between populations at different geographical scales. The identity of the female parent has a predominant effect on crossing success. Interparent distance has no effect in within‐population crosses; this strongly suggests an absence of inbreeding depression, expected in a species where the haploid phase is individualized and isomorphic to the diploid one. Crossing success tends to increase with distance between mates in between‐population crosses. This heterosis effect seems to indicate that the marine environment could allow genetic divergence between populations, even at short distances (about 100 m).