Experimental studies on hybridization and sexual isolation between some Aphytis species (Hymenoptera: Aphelinidae): I. Experimental hybridization and an interpretation of evolutionary relationships among the species
AuthorsSudha V. Rao
Authors AffiliationsSudha V. Rao (now Mrs. Sudha Nagarkatti) was with the Commonwealth Institute of Biological Control, Indian Station, Bellary Road, Bangalore (6), India; Paul DeBach was Professor of Biological Control, College of Biological and Agricultural Sciences, and Entomologist in the Experiment Station, Riverside.
Hilgardia 39(19):515-553. DOI:10.3733/hilg.v39n19p515. June 1969.
A biosystematic study was made of cultures of closely similar species of Aphytis (Hymenoptera, Chalcidoidea, Aphelinidae) from various countries. Sexual isolation was an important barrier to interspecific hybridization. Laboratory manipulations were devised to partially overcome this. Some fertile interspecific hybrids were obtained and hybrid lines established. Fecundity and sex ratio of hybrids improved in successive laboratory generations. A mathematical index was developed, based upon extent of hybrid progeny production, sex ratio, and degree of fertility of F1 hybrids, which depicts the degree of reproductive isolation between a given pair of species. It was concluded that the described species, africanus, lepidosaphes, melinus, fisheri and boloxanthus, are valid species with respect to each other and with respect to all other species studied. Aphytis coheni and “khunti,” A. lingnanensis and “2002,” and “R-65-23” and “2002” are considered to be semispecies with respect to each other. Additionally, the following are considered to be valid species with respect to each other: lingnanensis and coheni; lingnanensis and “khunti”; “2002” and coheni; “2002” and “khunti”; lingnanensis and “R-65-23”; “khunti” and “R-65-23”; and coheni and “R-65-23.”
Compere Harold. A systematic study of the genus Aphytis Howard (Hymenoptera, Aphelinidae) with descriptions of new species. Univ. Calif. Publ. Ent. 1955. 10(4):271-320.
Compere Harold. The red scale and its insect enemies. Hilgardia. 1961. 31(7):173-278. DOI: 10.3733/hilg.v31n07p173 [CrossRef]
DeBach Paul. New species and strains of Aphytis (Hymenoptera, Eulophidae) parasitic on the California red scale, Aonidiella aurantii (Mask.), in the Orient. Ann. Ent. Soc. Amer. 1959. 52(4):354-62.
DeBach Paul. The importance of taxonomy to biological control as illustrated by the cryptic history of Aphytis holoxanthus n. sp. (Hymenoptera: Aphelinidae), a parasite of Chrysomphalus aonidum, and Aphytis coheni n. sp., a parasite of Aonidiella aurantii. Ann. Ent. Soc. Amer. 1960. 53(6):701-05.
DeBach Paul, Landi John. The introduced purple scale parasite, Aphytis lepidosaphes Compere, and a method of integrating chemical with biological control. Hilgardia. 1961. 31(14):459-97. DOI: 10.3733/hilg.v31n14p459 [CrossRef]
DeBach Paul, White Ernest B. Commercial mass culture of the California red scale parasite Aphytis lingnanensis. Calif. Agr. Exp. Sta. Bul. 1960. 770:58 http://archive.org/details/commercialmasscu0770deba
Dobzhansky Th., Spassky B. Drosophila paulistorum, a cluster of species in status nascendi. Proc. Nat. Acad. Sci. 1959. 45:419-28. DOI: 10.1073/pnas.45.3.419 [CrossRef]
Dobzhansky Th., Mayr Ernst. Experiments on sexual isolation in Drosophila. I. Geographic strains of D. willistoni. Proc. Nat. Acad. Sci. 1944. 30:238-44. DOI: 10.1073/pnas.30.9.238 [CrossRef]
Flügge C. Geruchliche Raumorientierung von Drosophila melanogaster. Zeitschr. vergl. Physiol. 1934. 20:463-500.
Grant V. Selection for vigor and fertility in the progeny of a highly sterile species hybrid in Gilia. Genetics. 1966. 53(4):757-75.
Laven Hannes. Speciation by cytoplasmic isolation in the Culex pipiens complex. Cold Spring Harbor: Symposia on Quantitative Biol. 1959. 24:166-73. DOI: 10.1101/SQB.1959.024.01.017 [CrossRef]
Leahy M. G. Barriers to hybridization between Aedes aegypti and Aedes albopictus (Diptera: Culicidae) 1962. Ph.D. Thesis, University of Notre Dame
Mayr Ernst. Speciation phenomena in birds. Amer. Nat. 1940. 74:249-78. DOI: 10.1086/280892 [CrossRef]
Mayr Ernst. The role of the antennae in the mating behavior of female Drosophila. Evolution. 1950. 4(2):149-54. DOI: 10.2307/2405391 [CrossRef]
Mayr Ernst. Animal species and evolution. 1963. Cambridge, Mass.: Harvard University Press. 797p.
Mayr Ernst E., Linsley Gorton, Usinger Robert L. Methods and principles of systematic zoology. 1953. New York: McGraw-Hill Book Co., Inc. 328p.
Patterson J. T. Studies in the genetics of Drosophila. V. Isolating mechanisms. III. The insemination reaction and its bearing on the problem of speciation in the mulleri sub-group. Univ. Texas Pub. 1947. 4720:41-77.
Quednau F. W. A contribution on the genus Aphytis Howard in South Africa (Hymenoptera: Aphelinidae). Jour. Ent. Soc. South Africa. 1964. 27(1):86-116.
Quednau F. W. A technique for identifying mixed populations of six new species of Aphytis parasitic on red scale (Aonidiella aurantii (Mask.)), for recognition after recovery from scales collected in citrus orchards (Hymenoptera, Aphelinidae). South Africa Jour. Agr. Sci. 1965. 8:43-56.
Rao V. P., Sudha Rao V. Spoggosia (Stomatomyia) bezziana (Bar.) a Tachinid parasite of the coconut caterpillar, Nephantis serinopa Meyr. Commonwealth Inst. Biol. Control Tech. Bul. 1964. 4:95-112.
Shorey H. H., Gaston Lyle K. Sex pheromones of noctuid moths. III. Inhibition of male responses to the sex pheromone in Trichoplusia ni (Lepidoptera: Noctuidae). Ann. Ent. Soc. Amer. 1964. 57(6):775-79.
Spieth H. Mating behavior within the genus Drosophila. Bul. Amer. Mus. Nat. Hist. 1952. 99:395-474. article 7
Streisinger G. Experiments on sexual isolation in Drosophila. IX. Behavior of males with etherized females. Evolution. 1948. 2:187-88. DOI: 10.2307/2405377 [CrossRef]
Vaarama A. Inheritance of morphological characters and fertility in the progeny of the hybrid Rubus idaeus × R. arcticus 1954. Proc. 9th Internatl. Congress of Genetics (Caryologia Suppl. Vol.) 846-50
Waldron Ingrid. Courtship sound production in two sympatric sibling Drosophila species. Science. 1964. 144:191-93. DOI: 10.1126/science.144.3615.191 [CrossRef]