DNA metabarcoding reveals impact of local recruitment, dispersal, and
hydroperiod on assembly of a zooplankton metacommunity
Abstract
How the environment impacts the assembly of local communities as well as
their spatial and temporal connection in a metacommunity has remained a
largely unresolved question in community ecology. This study aims to
unravel the underlying metacommunity dynamics and environmental factors
that result in observed zooplankton communities. In extension to most
studies concerning metacommunity dynamics, we jointly examine
zooplankton communities both in open water and in the sediment where
zooplankton resting stages/dormant communities are stored. We used a
two-fragment DNA metabarcoding approach (COI and 18S) to monitor
zooplankton communities of 24 kettle holes over a two-year period to
unravel (I) how the community is spatially and temporally connected,
(II) what are the environmental factors influencing local communities,
and (III) what are the underlying metacommunity dynamics in this system.
We found a strong separation of zooplankton communities from kettle
holes of different hydroperiods (ephemeral vs. permanent) throughout the
season, while the community composition within single kettle holes did
not differ between years. Species richness was primarily dependent on pH
and hydroperiod, while species diversity was influenced by kettle hole
location. Community composition was further impacted by kettle hole
size, water temperature and pH. Soil samples showed a separate community
composition compared to water samples, but did not differ between
ephemeral and permanent kettle holes. Our results suggest that
communities are mainly structured by environmental filtering based on
pH, water temperature, kettle hole size and hydroperiod. Species sorting
is a dominant driver in community assembly in the studied kettle hole
zooplankton metacommunity.