---
_id: '3670'
abstract:
- lang: eng
text: The grasshopper Podisma pedestris includes two chromosomal races, which differ
by a Robertsonian fusion involving the sex chromosome. The two races meet in a
cline which runs for 100 km across the Alpes Maritimes in south-eastern France.
An intensive study of the easternmost end of this cline shows that it is about
800 m wide; the cline is not smooth, containing substantial spikes in chromosome
frequency which might be due to sampling drift. Though the cline seems narrow,
it is wide compared with the dispersal rate of the insect; a selective force of
only 0.5% would be enough to maintain the cline. It is difficult to determine
the nature of this force, but some evidence comes from the position of the cline,
and from the presence of coincident clines at other loci. An estimate of the distribution
of Podisma has been made, and the cline seems to follow, for the most part, a
region of low population density, suggesting that it is maintained by hybrid unfitness.
However, in the one region where the cline is relatively free to move, the XY
race bulges forwards more than would be expected if hybrids are unfit. The observation
of severe inviability in crosses between the races, though it is not associated
with the chromosomal difference, also indicates that this cline is the result
of some sort of genetic incompatibility.
acknowledgement: "Many thanks are due to the Hewitt family (Elizabeth, Daniel, Matthew,
and James), Bruce and Helen Halliday, Mike\r\n Shaw, Alan Jenyon, and Bob Williams
for their help in collecting the grasshoppers; to M. and Mme. Aviotti for their
hospitality in Casterino; and to Marise East for her help in karyotyping the samples.
The work was supported by a grant from the S.R.C. to G. Hewitt, and N. Barton was
supported by a N.E.R.C. studentship."
article_processing_charge: No
article_type: original
author:
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
- first_name: Godfrey
full_name: Hewitt, Godfrey
last_name: Hewitt
citation:
ama: Barton NH, Hewitt G. A chromosomal cline in the grasshopper Podisma pedestris.
Evolution; International Journal of Organic Evolution. 1981;35(5):1008-1018.
doi: 10.1111/j.1558-5646.1981.tb04966.x
apa: Barton, N. H., & Hewitt, G. (1981). A chromosomal cline in the grasshopper
Podisma pedestris. Evolution; International Journal of Organic Evolution.
Wiley-Blackwell. https://doi.org/
10.1111/j.1558-5646.1981.tb04966.x
chicago: Barton, Nicholas H, and Godfrey Hewitt. “A Chromosomal Cline in the Grasshopper
Podisma Pedestris.” Evolution; International Journal of Organic Evolution.
Wiley-Blackwell, 1981. https://doi.org/
10.1111/j.1558-5646.1981.tb04966.x.
ieee: N. H. Barton and G. Hewitt, “A chromosomal cline in the grasshopper Podisma
pedestris,” Evolution; International Journal of Organic Evolution, vol.
35, no. 5. Wiley-Blackwell, pp. 1008–1018, 1981.
ista: Barton NH, Hewitt G. 1981. A chromosomal cline in the grasshopper Podisma
pedestris. Evolution; International Journal of Organic Evolution. 35(5), 1008–1018.
mla: Barton, Nicholas H., and Godfrey Hewitt. “A Chromosomal Cline in the Grasshopper
Podisma Pedestris.” Evolution; International Journal of Organic Evolution,
vol. 35, no. 5, Wiley-Blackwell, 1981, pp. 1008–18, doi: 10.1111/j.1558-5646.1981.tb04966.x.
short: N.H. Barton, G. Hewitt, Evolution; International Journal of Organic Evolution
35 (1981) 1008–1018.
date_created: 2018-12-11T12:04:32Z
date_published: 1981-09-01T00:00:00Z
date_updated: 2022-01-21T08:51:51Z
day: '01'
doi: ' 10.1111/j.1558-5646.1981.tb04966.x'
extern: '1'
external_id:
pmid:
- '28581059'
intvolume: ' 35'
issue: '5'
language:
- iso: eng
main_file_link:
- url: http://www.jstor.org/stable/2407871
month: '09'
oa_version: None
page: 1008 - 1018
pmid: 1
publication: Evolution; International Journal of Organic Evolution
publication_identifier:
eissn:
- 1558-5646
issn:
- 0014-3820
publication_status: published
publisher: Wiley-Blackwell
publist_id: '2713'
quality_controlled: '1'
status: public
title: A chromosomal cline in the grasshopper Podisma pedestris
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 35
year: '1981'
...
---
_id: '3671'
article_processing_charge: No
article_type: original
author:
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
citation:
ama: Barton NH. The width of the hybrid zone in Caledia captiva. Heredity.
1981;47:279-282. doi:10.1038/hdy.1981.86
apa: Barton, N. H. (1981). The width of the hybrid zone in Caledia captiva. Heredity.
Nature Publishing Group. https://doi.org/10.1038/hdy.1981.86
chicago: Barton, Nicholas H. “The Width of the Hybrid Zone in Caledia Captiva.”
Heredity. Nature Publishing Group, 1981. https://doi.org/10.1038/hdy.1981.86.
ieee: N. H. Barton, “The width of the hybrid zone in Caledia captiva,” Heredity,
vol. 47. Nature Publishing Group, pp. 279–282, 1981.
ista: Barton NH. 1981. The width of the hybrid zone in Caledia captiva. Heredity.
47, 279–282.
mla: Barton, Nicholas H. “The Width of the Hybrid Zone in Caledia Captiva.” Heredity,
vol. 47, Nature Publishing Group, 1981, pp. 279–82, doi:10.1038/hdy.1981.86.
short: N.H. Barton, Heredity 47 (1981) 279–282.
date_created: 2018-12-11T12:04:32Z
date_published: 1981-10-01T00:00:00Z
date_updated: 2022-01-21T08:42:28Z
day: '01'
doi: 10.1038/hdy.1981.86
extern: '1'
intvolume: ' 47'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.nature.com/articles/hdy198186
month: '10'
oa: 1
oa_version: Published Version
page: 279 - 282
publication: Heredity
publication_identifier:
eissn:
- 1365-2540
issn:
- 0018-067X
publication_status: published
publisher: Nature Publishing Group
publist_id: '2712'
quality_controlled: '1'
scopus_import: '1'
status: public
title: The width of the hybrid zone in Caledia captiva
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 47
year: '1981'
...
---
_id: '4132'
article_processing_charge: No
article_type: original
author:
- first_name: Herbert
full_name: Edelsbrunner, Herbert
id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
last_name: Edelsbrunner
orcid: 0000-0002-9823-6833
- first_name: Hermann
full_name: Maurer, Hermann
last_name: Maurer
citation:
ama: Edelsbrunner H, Maurer H. On the intersection of Orthogonal objects. Information
Processing Letters. 1981;13(4-5):177-181. doi:10.1016/0020-0190(81)90053-3
apa: Edelsbrunner, H., & Maurer, H. (1981). On the intersection of Orthogonal
objects. Information Processing Letters. Elsevier. https://doi.org/10.1016/0020-0190(81)90053-3
chicago: Edelsbrunner, Herbert, and Hermann Maurer. “On the Intersection of Orthogonal
Objects.” Information Processing Letters. Elsevier, 1981. https://doi.org/10.1016/0020-0190(81)90053-3.
ieee: H. Edelsbrunner and H. Maurer, “On the intersection of Orthogonal objects,”
Information Processing Letters, vol. 13, no. 4–5. Elsevier, pp. 177–181,
1981.
ista: Edelsbrunner H, Maurer H. 1981. On the intersection of Orthogonal objects.
Information Processing Letters. 13(4–5), 177–181.
mla: Edelsbrunner, Herbert, and Hermann Maurer. “On the Intersection of Orthogonal
Objects.” Information Processing Letters, vol. 13, no. 4–5, Elsevier, 1981,
pp. 177–81, doi:10.1016/0020-0190(81)90053-3.
short: H. Edelsbrunner, H. Maurer, Information Processing Letters 13 (1981) 177–181.
date_created: 2018-12-11T12:07:08Z
date_published: 1981-01-01T00:00:00Z
date_updated: 2021-12-16T08:38:40Z
day: '01'
doi: 10.1016/0020-0190(81)90053-3
extern: '1'
intvolume: ' 13'
issue: 4-5
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/0020019081900533
month: '01'
oa: 1
oa_version: Published Version
page: 177 - 181
publication: Information Processing Letters
publication_identifier:
issn:
- 0020-0190
publication_status: published
publisher: Elsevier
publist_id: '1988'
quality_controlled: '1'
scopus_import: '1'
status: public
title: On the intersection of Orthogonal objects
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 13
year: '1981'
...
---
_id: '4133'
abstract:
- lang: eng
text: In 1979 Kirpatrick obtained a practically feasible algorithm for planar regionlocation
working in linear space and logarithmic time, provided the regions are bounded
by straight line segments. No algorithm requiring only linear space and log-polynomial
time was known, so far, for general planar regionlocation, i.e. for the case where
regions are bounded by curves more complicated than straight line segments. As
main result of this paper such an algorithm is presented.
article_processing_charge: No
article_type: original
author:
- first_name: Herbert
full_name: Edelsbrunner, Herbert
id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
last_name: Edelsbrunner
orcid: 0000-0002-9823-6833
- first_name: Hermann
full_name: Maurer, Hermann
last_name: Maurer
citation:
ama: Edelsbrunner H, Maurer H. A space-optimal solution of general region location.
Theoretical Computer Science. 1981;16(3):329-336. doi:10.1016/0304-3975(81)90103-1
apa: Edelsbrunner, H., & Maurer, H. (1981). A space-optimal solution of general
region location. Theoretical Computer Science. Elsevier. https://doi.org/10.1016/0304-3975(81)90103-1
chicago: Edelsbrunner, Herbert, and Hermann Maurer. “A Space-Optimal Solution of
General Region Location.” Theoretical Computer Science. Elsevier, 1981.
https://doi.org/10.1016/0304-3975(81)90103-1.
ieee: H. Edelsbrunner and H. Maurer, “A space-optimal solution of general region
location,” Theoretical Computer Science, vol. 16, no. 3. Elsevier, pp.
329–336, 1981.
ista: Edelsbrunner H, Maurer H. 1981. A space-optimal solution of general region
location. Theoretical Computer Science. 16(3), 329–336.
mla: Edelsbrunner, Herbert, and Hermann Maurer. “A Space-Optimal Solution of General
Region Location.” Theoretical Computer Science, vol. 16, no. 3, Elsevier,
1981, pp. 329–36, doi:10.1016/0304-3975(81)90103-1.
short: H. Edelsbrunner, H. Maurer, Theoretical Computer Science 16 (1981) 329–336.
date_created: 2018-12-11T12:07:08Z
date_published: 1981-01-01T00:00:00Z
date_updated: 2021-12-16T09:03:47Z
day: '01'
doi: 10.1016/0304-3975(81)90103-1
extern: '1'
intvolume: ' 16'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/0304397581901031
month: '01'
oa: 1
oa_version: Published Version
page: 329 - 336
publication: Theoretical Computer Science
publication_identifier:
issn:
- 0304-3975
publication_status: published
publisher: Elsevier
publist_id: '1989'
quality_controlled: '1'
scopus_import: '1'
status: public
title: A space-optimal solution of general region location
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 16
year: '1981'
...
---
_id: '4332'
article_processing_charge: No
author:
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
- first_name: Godfrey
full_name: Hewitt, Godfrey
last_name: Hewitt
citation:
ama: 'Barton NH, Hewitt G. Hybrid zones and speciation. In: Atchley W, Woodruff
D, eds. Evolution and Speciation. Cambridge University Press; 1981:109-145.'
apa: Barton, N. H., & Hewitt, G. (1981). Hybrid zones and speciation. In W.
Atchley & D. Woodruff (Eds.), Evolution and Speciation (pp. 109–145).
Cambridge University Press.
chicago: Barton, Nicholas H, and Godfrey Hewitt. “Hybrid Zones and Speciation.”
In Evolution and Speciation, edited by William Atchley and David Woodruff,
109–45. Cambridge University Press, 1981.
ieee: N. H. Barton and G. Hewitt, “Hybrid zones and speciation,” in Evolution
and Speciation, W. Atchley and D. Woodruff, Eds. Cambridge University Press,
1981, pp. 109–145.
ista: 'Barton NH, Hewitt G. 1981.Hybrid zones and speciation. In: Evolution and
Speciation. , 109–145.'
mla: Barton, Nicholas H., and Godfrey Hewitt. “Hybrid Zones and Speciation.” Evolution
and Speciation, edited by William Atchley and David Woodruff, Cambridge University
Press, 1981, pp. 109–45.
short: N.H. Barton, G. Hewitt, in:, W. Atchley, D. Woodruff (Eds.), Evolution and
Speciation, Cambridge University Press, 1981, pp. 109–145.
date_created: 2018-12-11T12:08:18Z
date_published: 1981-05-29T00:00:00Z
date_updated: 2021-12-16T08:24:04Z
day: '29'
editor:
- first_name: William
full_name: Atchley, William
last_name: Atchley
- first_name: David
full_name: Woodruff, David
last_name: Woodruff
extern: '1'
language:
- iso: eng
month: '05'
oa_version: None
page: 109 - 145
publication: Evolution and Speciation
publication_identifier:
isbn:
- 9-780-5212-3823-6
publication_status: published
publisher: Cambridge University Press
publist_id: '1702'
quality_controlled: '1'
related_material:
link:
- relation: other
url: https://agris.fao.org/agris-search/search.do?recordID=US201302583227
status: public
title: Hybrid zones and speciation
type: book_chapter
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
year: '1981'
...
---
_id: '4333'
abstract:
- lang: eng
text: Samples were taken from five sites in a transect across the hybrid zone between
two chromosomal races of the grasshopper Podisma pedestris. Crosses were set up
between insects from the same population, and between populations spanning the
zone, and the early viability of the offspring was measured. Hybrids between pure
populations had reduced viability, and the viability of insects from the middle
of the zone was still lower, showing that most (87 per cent) of the inviability
was due to the breakup of coadapated gene complexes. Although the total selection
acting was strong (log. fitness reduced by S25), it was spread over a region wider
than the dispersal range (350 m vs. 20 m). Hence, the selection on each locus
contributing towards the inviability is weak (3 per cent). Many (150) independent
chromosome segments act cumulatively to produce inviability at this stage in the
life history. The implications of these findings for models of divergence are
discussed.
article_processing_charge: No
article_type: original
author:
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
- first_name: Godfrey
full_name: Hewitt, Godfrey
last_name: Hewitt
citation:
ama: Barton NH, Hewitt G. The genetic basis of hybrid inviability between two chromosomal
races of the grasshopper Podisma pedestris. Heredity. 1981;47(3):367-383.
doi:10.1038/hdy.1981.98
apa: Barton, N. H., & Hewitt, G. (1981). The genetic basis of hybrid inviability
between two chromosomal races of the grasshopper Podisma pedestris. Heredity.
Springer Nature. https://doi.org/10.1038/hdy.1981.98
chicago: Barton, Nicholas H, and Godfrey Hewitt. “The Genetic Basis of Hybrid Inviability
between Two Chromosomal Races of the Grasshopper Podisma Pedestris.” Heredity.
Springer Nature, 1981. https://doi.org/10.1038/hdy.1981.98.
ieee: N. H. Barton and G. Hewitt, “The genetic basis of hybrid inviability between
two chromosomal races of the grasshopper Podisma pedestris,” Heredity,
vol. 47, no. 3. Springer Nature, pp. 367–383, 1981.
ista: Barton NH, Hewitt G. 1981. The genetic basis of hybrid inviability between
two chromosomal races of the grasshopper Podisma pedestris. Heredity. 47(3), 367–383.
mla: Barton, Nicholas H., and Godfrey Hewitt. “The Genetic Basis of Hybrid Inviability
between Two Chromosomal Races of the Grasshopper Podisma Pedestris.” Heredity,
vol. 47, no. 3, Springer Nature, 1981, pp. 367–83, doi:10.1038/hdy.1981.98.
short: N.H. Barton, G. Hewitt, Heredity 47 (1981) 367–383.
date_created: 2018-12-11T12:08:18Z
date_published: 1981-12-01T00:00:00Z
date_updated: 2021-12-16T08:31:08Z
day: '01'
doi: 10.1038/hdy.1981.98
extern: '1'
intvolume: ' 47'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.nature.com/articles/hdy198198
month: '12'
oa: 1
oa_version: Published Version
page: 367 - 383
publication: Heredity
publication_identifier:
eissn:
- 1365-2540
issn:
- 0018-067X
publication_status: published
publisher: Springer Nature
publist_id: '1703'
quality_controlled: '1'
scopus_import: '1'
status: public
title: The genetic basis of hybrid inviability between two chromosomal races of the
grasshopper Podisma pedestris
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 47
year: '1981'
...