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DISTRIBUTION OF ECO-ENGINEERING SPECIES IN ESTUARIES

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cordgrass diatoms

seagrass oysters

shells snails

shrimps worms

Stabilisers Destabilisers Ecological data

Information about 100 eco-engineering species was collected from literature and a data base http://eol.com with a:

Genus, species, taxonomic group

Functional group: stabilisers, destabilisers

Min, opt, max for elevation/depth, salinity, flow velocity, mud content preference

Size, growth rate, abundance, number of seeds, dispersal potential, generation time

From environmental factors we predicted spatial distribution of species.

Morphological data

Channel planform was visually recorded in Google Earth.

We compared estimations of depth zones based on estuary outline with measurements from bathymetry (Leuven et al., subm).

Salinity was predicted with Savenije (1993) and Brockway (2005).

ACTIVE CHANNEL POLYGON

ESTUARY POLYGON

INH

Question

How does the distribution of eco-engineering species affect the morphology of the system?

salinity elevation substrate water velocity

Stabilisers Destabilisers Distribution of

species Environmental

predictors

sediment dynamics

Effects of species on morphology

planform shapes

shoal patterns

Towards Answers

Finding distributions and biomasses of stabilisers and destabilisers in an estuary gradient

Finding the correlation among the species distribution, planform shapes, and shoal patterns in different estuaries

Finding out if stabilisers confine the estuary over time

Finding out if destabilisers make estuaries deeper

Salinity (‰)

Maarten Kleinhans Jasper Leuven Sanja Selaković

Tjeerd Bouma

DISTRIBUTION OF ECO-ENGINEERING SPECIES IN ESTUARIES

Sanja Selaković 1 , Jasper Leuven 1 , Tjeerd Bouma 2 & Maarten Kleinhans 1 S.Selakovic@uu.nl

2) in combined salinity and elevation (depth) gradients

Stab >> Destab

Stab > Destab

Stab < Destab

Stab << Destab

Distance from mouth (m)

SUP

SUP-INU INL-SUB

SUB

INU

SUB SUB-INL

INU INL

Stabilisers Destabilisers

Richness of stabilisers and destabilisers 1) in salinity gradient

Salinity (‰) Salinity (‰)

Conclusions

Proportion of stabilising/destabilising species in estuary gradient

shows increase in stabilisers going from estuary mouth to fresh water

Most stabilisers settle above high water level and destabilisers below

Future work

Add flow velocity as an environmental stressor of species distribution and as proxi for substrate type

Add biomass for ‘ecoengineering potential’ of the species into the calculation

Distibution of stabilisers and destabilisers in estuary gradient

Salinity Elevation (depth)

Salinity (‰)

SUP INH INL SUB

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