Table 1.
Reproductive Isolation Barriers Studied in This Report.
| Mechanism | Success | Failure | Index of isolation |
|---|---|---|---|
| Premating | Mated | Unmated | 1—mated/total paired |
| Postmating-prezygotic—NCGI | Hybrid eggs | Conspecific female eggs—hybrid eggs | 1—hybrid eggs/conspecifically mated female eggs |
| Postmating-prezygotic—CSP | NA | NA | See text for description |
| Postzygotic—hybrid inviability | Hybrid adults | Hybrid eggs - hybrid adults | 1—hybrid adults/hybrid eggs |
| Postzygotic—embryonic lethality | Hybrid egg cases | Dead embryos | Dead hybrid embryos/hybrid eggs |
| Postzygotic—larval lethality | Hybrid pupae | Hybrid egg cases—hybrid pupae | 1—hybrid pupae/hybrid egg cases |
| Postzygotic—pupal lethality | Hybrid adults | Hybrid pupae—hybrid adults | 1—hybrid adults/hybrid pupae |
| Postzygotic—female sterility | Females with ovarioles | Females without ovarioles | 1—females with ovarioles/total females |
| Postzygotic—male sterility | Males with motile sperm | Males without motile sperm | 1—males without motile sperm/total males |
NCGI: noncompetitive gametic isolation; CSP: conspecific sperm precedence.