umu.sePublikationer
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Ecology and Evolution of Adaptive Morphological Variation in Fish Populations
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Ekologi och geovetenskap.
2004 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The work in this thesis deals with the ecology and evolution of adaptive individual variation. Ecologists have long used niche theory to describe the ecology of a species as a whole, treating conspecific individuals as ecological equivalent. During recent years, research about individual variation in diet and morphology has gained interest in adaptive radiations and ecological speciation. Such variation among individual niche use may have important conservation implications as well as ecological and evolutionary implications. However, up to date we know very little about the extension of this phenomenon in natural populations and the mechanisms behind it.

The results in this thesis show that the extension of individual diet specialization is widely spread throughout the animal kingdom. The variation in diet is mainly correlated to morphological variation but not always. Furthermore, this variation in diet and morphology among individuals could be both genetically determined and environmentally induced and it mainly comes from trade-offs in foraging efficiency between different prey types.

The results from a number of studies of perch also show that individual perch differ in morphology and diet depending on habitat, where littoral perch has a deeper body compared to pelagic perch. This difference in morphology corresponds to functional expectations and is related to foraging efficiency trade-offs between foraging in the littoral and pelagic zone of a lake. The variation in morphology in perch is mainly due to phenotypic plasticity but there are also small genetic differences between the littoral and pelagic perch. Two separate studies show that both predation and competition may be important mechanism for the variation in morphology and diet in perch.

In conclusion, the results in this thesis show that individual variation in diet and habitat choice is a common phenomenon with lots of ecological and evolutionary implications. However, there are many mechanisms involved in this phenomenon on which we are just about to start learning more about, and only further research in this area will give us the full insight.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet , 2004. , s. 35
Nyckelord [en]
Ecology, competition, functional morphology, individual specialization, inter-individual variation, intra-population variation, morphological variation, ontogeny, Perca fluviatilis, perch, phenotypic plasticity, predation, trade-offs
Nyckelord [sv]
Ekologi
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:umu:diva-196ISBN: 91-7305-583-2 (tryckt)OAI: oai:DiVA.org:umu-196DiVA, id: diva2:142579
Disputation
2004-03-19, Stora Hörsalen, KBC, Umeå, 10:00
Opponent
Handledare
Tillgänglig från: 2004-02-11 Skapad: 2004-02-11 Senast uppdaterad: 2017-05-18Bibliografiskt granskad
Delarbeten
1. The ecology of individuals: incidence and implications of individual specialization
Öppna denna publikation i ny flik eller fönster >>The ecology of individuals: incidence and implications of individual specialization
Visa övriga...
2003 (Engelska)Ingår i: American Naturalist, Vol. 161, s. 1-28Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Miljövetenskap Ekologi
Identifikatorer
urn:nbn:se:umu:diva-3737 (URN)
Tillgänglig från: 2004-02-11 Skapad: 2004-02-11 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
2. Effects of habitat and food resources on morphology and ontogenetic growth trajectories in perch
Öppna denna publikation i ny flik eller fönster >>Effects of habitat and food resources on morphology and ontogenetic growth trajectories in perch
2002 (Engelska)Ingår i: Oecologia, Vol. 131, s. 61-70Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Ekologi Miljövetenskap
Identifikatorer
urn:nbn:se:umu:diva-3738 (URN)
Tillgänglig från: 2004-02-11 Skapad: 2004-02-11 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
3. Morphology dependent foraging efficiency in perch: a trade-off for ecological specialization?
Öppna denna publikation i ny flik eller fönster >>Morphology dependent foraging efficiency in perch: a trade-off for ecological specialization?
2003 (Engelska)Ingår i: Oikos, Vol. 102, s. 273-284Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Ekologi Miljövetenskap
Identifikatorer
urn:nbn:se:umu:diva-3739 (URN)
Tillgänglig från: 2004-02-11 Skapad: 2004-02-11 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
4. Genetic variation and phenotypic plasticity: Causes of morphological and dietary variation in Eurasian perch
Öppna denna publikation i ny flik eller fönster >>Genetic variation and phenotypic plasticity: Causes of morphological and dietary variation in Eurasian perch
2006 (Engelska)Ingår i: Evolutionary Ecology Research, ISSN 1522-0613, E-ISSN 1937-3791, Vol. 8, nr 1, s. 37-49Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Zoologi Ekologi Miljövetenskap
Identifikatorer
urn:nbn:se:umu:diva-3740 (URN)
Tillgänglig från: 2004-02-11 Skapad: 2004-02-11 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
5. Predation favors adaptive morphological variation in perch populations
Öppna denna publikation i ny flik eller fönster >>Predation favors adaptive morphological variation in perch populations
(Engelska)Manuskript (Övrigt vetenskapligt)
Nationell ämneskategori
Miljövetenskap Ekologi Zoologi
Identifikatorer
urn:nbn:se:umu:diva-3741 (URN)
Tillgänglig från: 2004-02-11 Skapad: 2004-02-11 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
6. Individual diet specialization, niche width and population dynamics: implications for trophic polymorphisms
Öppna denna publikation i ny flik eller fönster >>Individual diet specialization, niche width and population dynamics: implications for trophic polymorphisms
2004 (Engelska)Ingår i: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 73, nr 5, s. 973-982Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

1. We studied a perch Perca fluviatilis L. population that during a 9-year period switched between a phase of dominance of adult perch and a phase dominated by juvenile perch driven by cannibalism and intercohort competition. We investigated the effects of these population fluctuations on individual diet specialization and the mechanisms behind this specialization.

2. Due to cannibalism, the survival of young-of-the-year (YOY) perch was much lower when adult perch density was high than when adult perch density was low.

3. Both the individual niche breadth (if weighed for resource encounter) and the population niche breadth were highest when adult population density was high and, consequently, individual specialization was highest at high adult perch densities.

4. When adult perch density was low, the abundances of benthic invertebrate and YOY perch were high and dominated the diet of adult perch, whereas the density of zoo-plankton was low due to predation from YOY perch. At high perch densities, benthic invertebrate abundance was lower and zooplankton level was higher and some perch switched to feed on zooplankton.

5. Our results show that individual specialization may fluctuate with population density through feedback mechanisms via resource levels. Such fluctuations may have profound implications on the evolution of resource polymorphisms.

Ort, förlag, år, upplaga, sidor
Hoboken: Wiley-Blackwell, 2004
Nyckelord
competition, density dependence, interindividual variation, intrapopulation variation, niche breadth
Nationell ämneskategori
Miljövetenskap Ekologi Zoologi
Identifikatorer
urn:nbn:se:umu:diva-8044 (URN)10.1111/j.0021-8790.2004.00868.x (DOI)000223375900016 ()
Tillgänglig från: 2008-01-14 Skapad: 2008-01-14 Senast uppdaterad: 2018-06-09Bibliografiskt granskad

Open Access i DiVA

fulltext(624 kB)4276 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 624 kBChecksumma SHA-1
4fbcd3fca16ff1166c94e888c5f07236c782b2e4bb7f41751df8a956c2faac24d5ff2a49
Typ fulltextMimetyp application/pdf

Av organisationen
Ekologi och geovetenskap
Ekologi

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 4276 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

isbn
urn-nbn

Altmetricpoäng

isbn
urn-nbn
Totalt: 1090 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf