WFRF:(Johannesson Kerstin 1955)
Sökning: WFRF:(Johannesson Kerstin 1955) > (1995-1999) > The maintenance of ...
- Rolan-Alvarez, E. (författare)
The maintenance of a cline in the marine snail Littorina saxatilis: The role of home site advantage and hybrid fitness
- Artikel/kapitelEngelska1997
Förlag, utgivningsår, omfång ...
- 1997
Nummerbeteckningar
- LIBRIS-ID:oai:gup.ub.gu.se/83339
- https://gup.ub.gu.se/publication/83339URI
Kompletterande språkuppgifter
- Språk:engelska
Ingår i deldatabas
- SwePubSwePub
Klassifikation
Anmärkningar
- Steep clinal transitions in one or several inherited characters between genetically distinct populations are usually referred to as hybrid zones. Essentially two different mechanisms may maintain strap genetic dines. Either selection acts against hybrids that are unfit over the entire zone due to their mixed genetic origin (endogenous selection), or hybrids and parental types attain different fitness values in different parts of the dine (exogenous selection). Survival rate estimates of hybrids and parental forms in different regions of the dine may be used to distinguish between these models to assess how the dine is maintained. We used reciprocal transplants to test the relative survival rates of two parental ecotypes and their hybrids over microscale hybrid zones in the direct-developing marine snail Littorina saxatilis (Olivi) on the rocky shores of Galicia, Spain. One of the parental forms occupies upper and the other lower shores, and the hybrids are found at various proportions (1-38%) along with both parental forms in a midshore zone a few meters wide. The survival rate over one month was 39-52% of the native ecotype on upper shores, but only 2-8% for the lower-shore ecotype. In contrast, only 4-8% of the upper-shore ecotype but 53% of large (> 6 mm) and 8% of small (3-6 mm) native lower-shore ecotype survived in the lower shores. In the midshores, both the two parental ecotypes and the hybrids survived about equally well. Thus there is a considerable advantage for the native ecotypes in the upper and lower shores, while in the hybrid zone none of the morphs. hybrids included, are favored. This indicates that the dimorphism of L. saxatilis is maintained by steep cross-shore selection gradients, thus supporting the selection-gradient model of hybrid zones. We performed field and laboratory experiments that suggest physical factors and predation as important selective agents. Earlier studies indicate assortative mating between the two ecotypes in the midshore. This is unexpected in a hybrid zone maintained by selection gradients, and it seems as if the reproductive barrier compresses the hybrid zone considerably.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Biologi Ekologi hsv//swe
- NATURAL SCIENCES Biological Sciences Ecology hsv//eng
- NATURVETENSKAP Biologi hsv//swe
- NATURAL SCIENCES Biological Sciences hsv//eng
- differential selection
- hybrid zone
- reciprocal transplants
- reinforcement
- selection-gradient model
- tension-zone model
- viability estimates
- 2 sympatric morphs
- intertidal snail
- nucella-lapillus
- heterogeneous environments
- genetic differentiation
- protected shores
- shell morphology
- sexual selection
- size
- gastropod
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Johannesson, Kerstin,1955Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi, Tjärnö marinbiologiska laboratorium,Department of Marine Ecology, Tjärnö Marine Biological Laboratory(Swepub:gu)xjoker (författare)
- Erlandsson, JohanGothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Institutionen för marin ekologi, Tjärnö marinbiologiska laboratorium,Department of Marine Ecology,Department of Marine Ecology, Tjärnö Marine Biological Laboratory(Swepub:gu)xerljo (författare)
- Göteborgs universitetInstitutionen för marin ekologi, Tjärnö marinbiologiska laboratorium (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Evolution51:6, s. 1838-18470014-3820
Internetlänk
Hitta mer i SwePub
- Av författaren/redakt...
- Rolan-Alvarez, E ...
- Johannesson, Ker ...
- Erlandsson, Joha ...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Biologi
- och Ekologi
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Biologi
- Artiklar i publikationen
- Evolution
- Av lärosätet
- Göteborgs universitet
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
