Partitioning the effects of an ecosystem engineer: kangaroo rats control community structure via multiple pathways

1. Ecosystem engineers impact communities by altering habitat conditions, but they can also have strong effects through consumptive, competitive and other non-engineering pathways. 2. Engineering effects can lead to fundamentally different community dynamics than non-engineering effects, but the rel...

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Bibliographic Details
Published in:	The Journal of animal ecology 2012-05, Vol.81 (3), p.667-678
Main Authors:	Prugh, Laura R., Brashares, Justin S.
Format:	Article
Language:	eng
Subjects:	Abundance Animal and plant ecology Animal ecology Animal, plant and microbial ecology Animals Behavior, Animal Biodiversity Biological and medical sciences Burrows California Communities Community ecology Community structure competition Dipodomys Dipodomys - physiology Dipodomys ingens Ecological engineering Ecosystem ecosystem engineer Ecosystem studies Engineering facilitation food web Fundamental and applied biological sciences. Psychology General aspects Grasses Grasslands Habitat habitat modification indirect effects Invertebrates Invertebrates - classification Invertebrates - physiology Kangaroos keystone species Lacertilia Mammalia Mathematical models Plant communities Plants Plants - classification Rats Rodents Species diversity Time Factors trophic effects Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
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Summary:	1. Ecosystem engineers impact communities by altering habitat conditions, but they can also have strong effects through consumptive, competitive and other non-engineering pathways. 2. Engineering effects can lead to fundamentally different community dynamics than non-engineering effects, but the relative strengths of these interactions are seldom quantified. 3. We combined structural equation modelling and exclosure experiments to partition the effects of a keystone engineer, the giant kangaroo rat (Dipodomys ingens), on plants, invertebrates and vertebrates in a semi-arid California grassland. 4. We separated the effects of burrow creation from kangaroo rat density and found that kangaroo rats increased the diversity and abundance of other species via both engineering and non-engineering pathways. 5. Engineering was the primary factor structuring plant and small mammal communities, whereas non-engineering effects structured invertebrate communities and increased lizard abundance. 6. These results highlight the importance of the non-engineering effects of ecosystem engineers and shed new light on the multiple pathways by which strong-interactors shape communities.
ISSN:	0021-8790 1365-2656