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
Weighted species richness outperforms species richness as predictor of biotic resistance
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för matematik och matematisk statistik. (Arcum)
Swedish University of Agriculture Sciences, Department of Forest Vegetation Ecology.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Visa övriga samt affilieringar
2016 (Engelska)Ingår i: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 97, nr 1, s. 262-271Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The species richness hypothesis, which predicts that species-rich communities should be better at resisting invasions than species-poor communities, has been empirically tested many times and often poorly supported. In this paper we contrast the species richness hypothesis with four alternative hypotheses with the aim of finding better descriptors of invasion resistance. These alternative hypotheses state that resistance to invasions is determined by abiotic conditions, community saturation (i.e., the number of resident species relative to the maximum number of species that can be supported), presence/absence of key species, or weighted species richness. Weighted species richness is a weighted sum of the number of species, where each species' weight describes its contribution to resistance. We tested these hypotheses using data on the success of 571 introductions of four freshwater fish species into lakes throughout Sweden (i.e., Arctic char (Salvelinus alpinus), tench (Tinca tinca), zander (Sander lucioperca), and whitefish (Coregonus lavaretus)). We found that the weighted species richness best predicted invasion success. The weights describing the contribution of each resident species to community resistance varied considerably in both strength and sign. Positive resistance weights, which indicate that species repel invaders, were as common as negative resistance weights, which indicate facilitative interactions. This result can be contrasted with the implicit assumption of the original species richness hypothesis, that all resident species have negative effects on invader success. We argue that this assumption is unlikely to be true in natural communities, and thus that we expect that weighted species richness is a better predictor of invader success than the actual number of resident species.

Ort, förlag, år, upplaga, sidor
2016. Vol. 97, nr 1, s. 262-271
Nyckelord [en]
biotic resistance, freshwater fish, species identity, species richness, saturation, weighted species richness
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:umu:diva-110249DOI: 10.1890/15-0463.1ISI: 000369852600027OAI: oai:DiVA.org:umu-110249DiVA, id: diva2:861759
Tillgänglig från: 2015-10-19 Skapad: 2015-10-19 Senast uppdaterad: 2018-06-07Bibliografiskt granskad
Ingår i avhandling
1. Biotic resistance in freshwater fish communities
Öppna denna publikation i ny flik eller fönster >>Biotic resistance in freshwater fish communities
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Invasions of non-native species cause problems in ecosystems worldwide, and despite the extensive effort that has been put into research about invasions, we still lack a good understanding for why some, but not other, communities resist these invasions. In this doctoral thesis I test hypotheses on biotic resistance using a large dataset of more than 1000 both failed and successful introductions of freshwater fish into Swedish lakes. We have found that the classic species richness hypothesis is a poor descriptor of introduction success because it fails to acknowledge that resident species contribute to the resistance in different ways. We developed a new measure of biotic resistance, the weighted species richness, which takes into account that the resident species contributes to the resistance with different strength and sign. Further, we correlated performance traits of species in their role as an invader and as a resident species to predict how the biotic resistance of these communities would develop over time. We found a positive correlation between performance traits: Some species have high introduction success, they make a large contribution to the resistance, and they cause extinctions when introduced but do not go extinct themselves when other species establishes, whereas other species are weak performers in these respects. Thus, the biotic resistance of these communities should grow stronger as non-native species accumulates. These results give us clues about what type of communities that should be most sensitive to further invasions, i.e., communities harboring species weak performers. 

My results show that the biotic resistance of communities is an important factor in determining invasibility of a community. They also show that methods for quantifying resistance must take into account how interactions are structured in nature. What determine the biotic resistance of a community is the type of interactions that the resident species have with the invader and not the species richness of the community.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet, 2015. s. 26
Nyckelord
biotic resistance, freshwater fish, introductions, invasions, invasion success, invasibility, invasiveness, species richness, saturation, species identity, weighted species richness
Nationell ämneskategori
Ekologi
Identifikatorer
urn:nbn:se:umu:diva-110251 (URN)978-91-7601-326-7 (ISBN)
Disputation
2015-11-12, Naturvetarhuset, N320, Umeå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2015-10-22 Skapad: 2015-10-19 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltext

Personposter BETA

Henriksson, AnnaYu, JunTrygg, JohanEnglund, Göran

Sök vidare i DiVA

Av författaren/redaktören
Henriksson, AnnaYu, JunTrygg, JohanEnglund, Göran
Av organisationen
Institutionen för ekologi, miljö och geovetenskapInstitutionen för matematik och matematisk statistikKemiska institutionen
I samma tidskrift
Ecology
Ekologi

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 472 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