Introgression Between Closely Related Species of Drosophila in Panama

Pipkin, Sarah Bedichek

doi:10.2307/2406659

Cited by 6 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kastritsis (1966) reported minimal numbers of inversion differences distinguishing four of the ''races'' of D. paulistorum from the Standard sequence as one, three, five and six. Pipkin (1968) obtained hybrids between D. metzii and D. pellewae and found translocations involving four pairs of autosomes. Complex autosomal translocations were also found to distinguish D. leticiae from D. metzii.…”

Section: Discussionmentioning

confidence: 99%

Intra- and interspecific chromosomal inversions in the Drosophila bipectinata species complex

Bock

1971

Chromosoma

View full text Add to dashboard Cite

Twenty autosomal inversions were detected in the polytene chromosomes of larvae obtained by hybridizing inversion-free strains of the species of the bipectinata complex (D. bipectinata, D. parabipectinata, D. malerkotliana and D. psewloananassae). Twenty autosomal inversions are also known as extant polymorphisms in these species; fifteen (possibly sixteen) of these inversions are different from those detected in the interspecific hybrids. The available evidence permits reconstruction of chromosome phylogenies deriving malerkotliana, pseudoananassae and a population ancestral to both bipectinata and parabipectinata directly from a common ancestral population. The results of the study support the Carson hypothesis of transitional homoselection during the processes of speciation.

show abstract

Section: Discussionmentioning

confidence: 99%

Intra- and interspecific chromosomal inversions in the Drosophila bipectinata species complex

Bock

1971

Chromosoma

View full text Add to dashboard Cite

show abstract

“…Bigelow ( 1965) suggested that, where hybrids are formed in peripheral populations only, any trend in these populations to reinforce isolating mechanisms would be swamped by gene flow from central populations into the peripheral, hybridizing zone. Bigelow's hypothesis has since been supported by data on American pocket-gophers (Thaeler, 19681, Australian frogs (Watson, 1972) and Panamanian fruit-flies ( Pipkin, 1968). Leuantinu, however, is a very sedentary snail which is usually found in small, semi-isolated populations.…”

Section: Discussionmentioning

confidence: 91%

Distribution, hybridization and variation in the Israeli landsnail Levantina (Pulmonata: Helicidae)

Heller

1979

Zoological Journal of the Linnean Society

View full text Add to dashboard Cite

The rock‐dwelling landsnail Leuantinu is represented in Israel by two species, caesareana and hierosolyma. They are both found abundantly in Mediterranean, steppe, semi‐arid and extremely arid habitats, and are probably ancient elements in the Israeli fauna. Their common borderline shows no association with altitude, rainfall, temperature, climatic zones, lithology, phytogeography, or the distribution of predators. The possiblity that one species is actively displacing the other, and that the position of the borderline is temporary, is rejected on grounds both of previous research and of fossil finds. A narrow hybrid zone occurs in most places along the borderline. Laboratory experiments show that these hybrids are inferior to the parent species in viability and fecundity, and that assortative mating of the two parent species occurs in a mixed population. Hybridization may perhaps be maintained because selection favours the individual that will mate with its own species whenever it can tind one, but is capable of mating with other species when it cannot. In these conditions, hybridization is not a waste of reproductive energy. Certain morphological changes occur in the vicinity of the hybrid zone. Far from the zone, caesareana resembles hierosolyma in shell‐height, shell shape and genitalia; approaching the hybrid zone it diverges from hierosolyma in these characteristics and develops a distinct variant, caesareana var. werneri. This divergence may represent an accumulation of isolating mechanisms in the proximity of the hybrid zone, and thus be a case of reproductive character displacement. If indeed it is, then it differs from most described cases of character displacement in that the species are parapatric, not sympatric, and the displaced character is found not only at the common frontier but also from 2–12 km into the allopatric zone.

show abstract

“…Women published an increasing number of speciation papers in Evolution throughout 1960s, 1970s, and 1980s. Over this time, women continued to document patterns of hybridization in nature, including Batia Pazy's study of Aegilops (Pazy &Zohary, 1965), Sara Bedichek Pipkin's (1968) study of introgression between Drosophila metzii and D. pellewae , Hana Bar‐El's work on mole rats (Nevo & Bar‐El, 1976), Flavia O'Rourke's study of milkweed bugs (O'Rourke, 1979), and Janiece McHale's use of chemical patterns to identify hybrid legumes (McHale & Alston, 1964). As the speciation field matured, women published Evolution papers that addressed the pressing conceptual questions of the day, including the study of ecological (Kellogg 1975) and sexual (Koepfer, 1987a, b; Wasserman & Koepfer, 1977) character displacement and studies of hybrid zones (Galler & Gould 1979; Patton et al., 1979).…”

mentioning

confidence: 99%