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Higher resistance to herbivory in introduced compared to native populations of a seaweed
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2010 (English)In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 164, no 3, 833-840 p.Article in journal (Refereed) Published
Abstract [en]

Non-indigenous species (NIS) are important components of global change, and in order to manage such species it is important to understand which factors affect their success. Interactions with enemies in the new range have been shown to be important for the outcome of introductions, but thus far most studies on NIS-enemy interactions have considered only specialist herbivores in terrestrial systems. Here we present the results from the first biogeographic study that compares herbivore resistance between populations in the native and new region of a non-indigenous seaweed. We show that low consumption of the non-indigenous seaweed by a generalist herbivore is caused by higher chemical defence levels and herbivore resistance in the new range-and not by the failure of the herbivore to recognise the non-indigenous seaweed as a suitable host. Since most seaweed-herbivore interactions are dominated by generalist herbivores, this pattern could be common in marine communities. Our results also reveal that traits used to predict the invasive potential of species, such as their resistance to enemies, can change during the invasion process, but not always in the way predicted by dominant theories.

Place, publisher, year, edition, pages
2010. Vol. 164, no 3, 833-840 p.
Keyword [en]
Non-indigenous species, Enemy release, Generalist grazer, Fucus evanescens, Littorina littorea
National Category
Botany Ecology
Research subject
Plant Ecology
Identifiers
URN: urn:nbn:se:su:diva-49552DOI: 10.1007/s00442-010-1767-1ISI: 000283097900024OAI: oai:DiVA.org:su-49552DiVA: diva2:378319
Available from: 2010-12-15 Created: 2010-12-15 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Herbivory, phenotypic variation, and reproductive barriers in fucoids
Open this publication in new window or tab >>Herbivory, phenotypic variation, and reproductive barriers in fucoids
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Along the shores of the Northern hemisphere Fucus (Phaeophyceae) species are a prominent presence, providing substrate, shelter, and food for many species. Fucus evanescens, a non-indigenous species (NIS) in Sweden, and F. radicans, a recently described species that so far has only been found inside the species poor Baltic Sea, are the focus of this thesis.

Interactions with enemies (e.g. predators, herbivores, parasites) have been shown to play a role in the success of NIS. The low consumption of Fucus evanescens by the generalist gastropod Littorina littorea in Sweden was found to depend on high levels of chemical defense in the introduced population, not the failure of the herbivore to recognize F. evanescens as suitable food.

A survey of the relative abundance of F. radicans and F. vesiculosus and the most common associated fauna along the Swedish Bothnian Sea coast showed that F. radicans and F. vesiculosus are equally abundant throughout the range of F. radicans. The most common associated fauna were found to be more abundant on F. radicans compared to F. vesiculosus.  In Sweden, where F. radicans had lower levels of defense chemicals than F. vesiculosus, F. radicans was grazed more than F. vesiculosus in bioassays. This could, together with other factors, influence the range of F. radicans.

Fucus radicans and F. vesiculosus are closely related, recently separated, and growing sympatrically, therefore, possible reproductive barriers between F. radicans and F. vesiculosus were studied. In Estonia F. radicans and F. vesiculosus reproduces at different times of the year. No such clear reproductive barrier was found between the two species in Sweden where they reproduce at the same time and fertilization success and germling survival were the same for hybrids as for F. vesiculosus.

Since the high clonality of F. radicans means that the gentic diversity in F. radicans populations is low I investigated how genetic diversity translates to phenotypic diversity in nine traits. Phlorotannin levels, recovery after desiccation, and recovery after freezing showed inherited variation, while the other six traits showed no variation related to genetic diversity. Phenotypic variation in populations of F. radicans will be higher in populations with higher genetic diversity and this might be beneficial to the community.

Place, publisher, year, edition, pages
Stockholm: Department of Botany, Stockholm University, 2012. 49 p.
Keyword
Non-indigenous species, Enemy Release Hypothesis, Asexual reproduction, Phlorotannins, Distribution
National Category
Ecology
Research subject
Plant Ecology
Identifiers
urn:nbn:se:su:diva-79481 (URN)978-91-7447-538-8 (ISBN)
Public defence
2012-10-11, föreläsningssalen, Botaniska institutionen, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Accepted.

Available from: 2012-09-19 Created: 2012-09-04 Last updated: 2012-09-06Bibliographically approved

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