NDLI: Dynamics of fish dispersal during river-floodplain connectivity and its implications for community assembly

Content Provider	Springer Nature Link
Author	Stoffels, Rick J. Rehwinkel, Rohan A. Price, Amina E. Fagan, William F.
Copyright Year	2015
Abstract	In river-floodplain ecosystems, overbank flows interact with floodplain geomorphology to generate a network of transient inter-waterbody connections. Heterogeneity in the characteristics of these connections may interact with species-specific dispersal capacity to affect the maintenance of diversity and community assembly on the floodplain. We modelled the immigration and emigration rates of nine species of fish entering and leaving a large floodplain lake during a hydrological connection with the parent river. Dispersal rates were modelled as a continuous function of time-since-connection over 3 months, with the aim of testing for species-specific patterns in (a) the timing and magnitudes of lateral dispersal, and (b) the balance between total immigration into, and emigration from, the lake. Significant interspecific variation in the timing and magnitude of lateral dispersal was evident. Magnitude of lateral dispersal was not a function of local abundance for all species. Further, the balance between immigration to, and emigration from, the lake varied significantly across species, and over time within species. The immigration–emigration balance of a species was not related to its magnitude of lateral dispersal, but may be related to its behavioural and life-history traits. Spatial heterogeneity in the duration of inter-waterbody connections may interact with species-specific dispersal functions to shape assembly of floodplain communities. Accordingly, habitat heterogeneity among floodplain waterbodies is not strictly necessary for heterogeneity in fish community composition. These dynamics have implications for the maintenance of diversity in river-floodplain fish metacommunities under both natural and managed connectivity regimes.
Starting Page	355
Ending Page	365
Page Count	11
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	78
Issue Number	2
e-ISSN	14209055
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-10-13
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flood-Pulse Concept Metacommunity processes Movement ecology Temporal ecology Transient connectivity Freshwater & Marine Ecology Marine & Freshwater Sciences Oceanography Ecology Life Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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