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University of Oulu

1. Vilmi, A. (Annika). Assessing freshwater biodiversity:insights from different spatial contexts, taxonomic groups and response metrics.

Degree: 2017, University of Oulu

Abstract Freshwater ecosystems are severely threatened by a variety of anthropogenic stressors. In order to keep track with at least part of the changes, it is important to efficiently assess and monitor freshwater biological diversity. Biological assessment programs are developed to detect human-induced changes in the ecological state of aquatic systems. These programs typically rely on the assumption that environmental conditions are the sole drivers of biological communities occupying a site and, thus, these local communities would correctly inform about environmental conditions. Recently, this background principle of current bioassessment methods has faced some criticism, stemming from the idea that community structuring is a more complex process than just a mere result of local environmental conditions. In this thesis, I studied the natural and anthropogenic drivers of freshwater biodiversity. I was particularly interested if the various biodiversity metrics studied showed any spatial patterns and if so, for which reasons these patterns might occur. To obtain a comprehensive picture of spatial patterns in biodiversity, I studied multiple spatial contexts, biological groups and indices. I found that environmental conditions were not the only drivers of freshwater biodiversity. Instead, different spatial patterns, likely stemming from dispersal processes, were surprisingly powerful drivers of aquatic communities and index values derived from them. The spatial context (i.e. spatial extent and connectivity) of the aquatic study systems likely played a major role in structuring biodiversity. I also found that the distinct biological groups and indices studied were partly related to different predictor variables. The findings of this thesis are of importance to the development of new bioassessment methods. The results of this thesis also suggest that the spatial context of the study setting should be acknowledged when interpreting results based on current bioassessment methods.

Tiivistelmä Makeanveden ekosysteemit ovat hyvin alttiita ihmistoiminnalle. Ekosysteemissä mahdollisesti tapahtuvien muutosten havaitseminen vaatii tehokkaita vesistöjen ekologisen tilan ja luonnon monimuotoisuuden arviointi- ja seurantamenetelmiä. Näiden menetelmien toimintaperiaatteen yleisenä tausta-ajatuksena on, että biologiset yhteisöt määräytyvät paikallisten ympäristöolojen mukaan. Tietyn paikan yhteisön oletetaan siis heijastavan kyseisen paikan ympäristön tilaa. Viime aikoina tausta-ajatus paikallisten ympäristöolojen merkityksestä ainoana eliöyhteisöjä muovaavana tekijänä on kuitenkin kohdannut kritiikkiä. Kriitikot painottavat, että biologisten yhteisöjen rakenteeseen vaikuttavat monet muutkin asiat kuin paikalliset ympäristöolosuhteet ja niissä tapahtuvat ihmisperäiset muutokset. Väitöskirjassani tutkin sisävesien luonnon monimuotoisuuteen vaikuttavia tekijöitä. Olin erityisen kiinnostunut siitä, näkyykö tutkituissa biologisissa parametreissa maantieteellisessä tilassa ilmeneviä spatiaalisia säännönmukaisuuksia. Saadakseni…

Advisors/Committee Members: Heino, J. (Jani), Karjalainen, S. (Satu Maaria), Oksanen, J. (Jari).

Subjects/Keywords: aquatic ecosystems; bacteria; biodiversity; biological monitoring; community structure; diatoms; dispersal; ecological indicators; macroinvertebrates; macrophytes; mass effects; metacommunities; spatial patterns; bakteerit; biologinen seuranta; dispersaali; ekologiset indikaattorit; luonnon monimuotoisuus; metayhteisöt; piilevät; pohjaeläimet; spatiaaliset säännönmukaisuudet; vesiekosysteemit; vesikasvit; yhteisörakenne

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Vilmi, A. (. (2017). Assessing freshwater biodiversity:insights from different spatial contexts, taxonomic groups and response metrics. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:9789526216669

Chicago Manual of Style (16th Edition):

Vilmi, A (Annika). “Assessing freshwater biodiversity:insights from different spatial contexts, taxonomic groups and response metrics.” 2017. Doctoral Dissertation, University of Oulu. Accessed February 18, 2019. http://urn.fi/urn:isbn:9789526216669.

MLA Handbook (7th Edition):

Vilmi, A (Annika). “Assessing freshwater biodiversity:insights from different spatial contexts, taxonomic groups and response metrics.” 2017. Web. 18 Feb 2019.

Vancouver:

Vilmi A(. Assessing freshwater biodiversity:insights from different spatial contexts, taxonomic groups and response metrics. [Internet] [Doctoral dissertation]. University of Oulu; 2017. [cited 2019 Feb 18]. Available from: http://urn.fi/urn:isbn:9789526216669.

Council of Science Editors:

Vilmi A(. Assessing freshwater biodiversity:insights from different spatial contexts, taxonomic groups and response metrics. [Doctoral Dissertation]. University of Oulu; 2017. Available from: http://urn.fi/urn:isbn:9789526216669

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