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Sökning: onr:"swepub:oai:DiVA.org:su-7177" > The spatial and tem...

The spatial and temporal dynamics of plant-animal interactions in the forest herb Actaea spicata

von Zeipel, Hugo, 1973- (författare)
Stockholms universitet,Botaniska institutionen
Ehrlén, Johan, Professor (preses)
Stockholms universitet,Botaniska institutionen
Eriksson, Ove, Professor (preses)
Stockholms universitet,Botaniska institutionen
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van Nouhuys, Saskya, Senior researcher (opponent)
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca
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 (creator_code:org_t)
ISBN 9789171555359
Stockholm : Botaniska institutionen, 2007
Engelska 33 s.
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)
Abstract Ämnesord
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  • Landscape effects on species performance currently receives much attention. Habitat loss and fragmentation are considered major threats to species diversity. Deciduous forests in southern Sweden are previous wooded pastures that have become species-rich communities appearing as islands in agricultural landscapes, varying in species composition. Actaea spicata is a long-lived plant occurring in these forests. In 150 populations in a 10-km2 area, I studied pre-dispersal seed predation, seed dispersal and pollination. I investigated spatio-temporal dynamics of a tritrophic system including Actaea, a specialist seed predator, Eupithecia immundata, and its parasitoids. In addition, effects of biotic context on rodent fruit dispersal and effects of flowering time and flower number on seed set, seed predation and parasitization were studied. Insect incidences of both trophic levels were related to resource population size and small Eupithecia populations were maintained by the rescue effect. There was a unimodal relationship between seed predation and plant population size. Seed predator populations frequently went extinct in small plant populations, resulting in low average seed predation. Parasitoids were present in large plant populations but did not affect seed predator density. Seed predators aggregated at edges, relaxing seed predation in patch interiors. Flowering phenology was unrelated to seed set and insect incidence. A higher flower number did not influence seed predation but was associated with higher seed set and a tendency for a higher parasitization rate. In the study on fruit dispersal more fruits were removed inside than outside populations. Within plant populations more fruits were removed from large aggregations. Overall, this thesis underlines the importance of plant-animal interactions during different phases of the life cycle. The spatial configuration of host plants plays an important role for the outcome of plant-animal interactions and trophic cascades.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

Eupithecia immundata
parasitoid
rodent
seed predation
dispersal
recruitment
multitrophic
metapopulation
trophic cascades
community complexity
Biology
Biologi
Plant Ecology
växtekologi

Publikations- och innehållstyp

vet (ämneskategori)
dok (ämneskategori)

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