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Partitioning the effects of an ecosystem engineer: kangaroo rats control community structure via multiple pathways
Author(s) -
Prugh Laura R.,
Brashares Justin S.
Publication year - 2012
Publication title -
journal of animal ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.134
H-Index - 157
eISSN - 1365-2656
pISSN - 0021-8790
DOI - 10.1111/j.1365-2656.2011.01930.x
Subject(s) - ecosystem engineer , keystone species , ecology , ecosystem , abundance (ecology) , species richness , biology , nestedness , community structure , metacommunity , biological dispersal , population , demography , sociology
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.