Some ecosystem properties such as marsh grass density and fish abundance return fairly quickly to levels similar to natural marshes, but accretion rates and other biogeochemical processes such as soil nitrogen storage may take longer (Piehler et al).
One increasingly common mitigation activity is the construction of rock sills in the low marsh zone to stabilize marsh elevation.
Sills dramatically alter the physical structure of marshes by changing elevation, adding hard substrate and potentially altering the spatial structure of benthic algal communities in and adjacent to the low marsh.
We documented differences in benthic algal abundance at the seaward marsh edge in silled and unsilled marshes in North Carolina.
We found that sills were associated with reduced standing stocks of benthic algal primary production and reduced macroalgal taxonomic richness, and this difference was driven primarily by differences in macroalgal abundance.
We experimentally tested the effect of macroalgal abundance on cordgrass () growth in the low zone of an unmanipulated marsh, and found that macroalgal removal had no effect on final cordgrass abundance.
Our study suggests that salt marsh management through the construction of sills in low marsh zones impacts benthic primary production in the low marsh zone, but that benthic algal production does not affect cordgrass growth over a growing season. S., the rate of sea level rise over the past century (2.4–4.4 mm/year) exceeded the global average rate of 1.7 mm/year, affecting the elevation, function and distribution of shoreline habitats as well as restoration projects (Nixon ).
These projects attempt to accommodate tidal marshes while also stabilizing shorelines, but the full effects of installed structures on the structure and function of coastal ecosystems are not well understood.
One shoreline erosion management method is the construction of a ‘living shoreline’, which is built behind a hard substrate such as a rock sill installed seaward of a marsh (Hershner et al).
The Marsh fritillary (Euphydryas aurinia) (Lepidoptera: Nymphalidae) has declined across Europe, including the Czech Republic.
Current conservation strategies rely on prevention of habitat loss and degradation, and increase in habitat quality and connectivity via promoting traditional grassland management.
The population structure and adult demography parameters of a single population was investigated for eight years (single system), and of all the known Czech populations (multiple populations) for a single year, using mark-recapture.