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Table 4
Parameter estimates used in the population model as well as start values for scenarios.
| Model parameter | Value | Unit | Remarks and source |
|---|---|---|---|
| Number of reproductive adults | 12,000 | N | Model input for adult scenarios: nr of adults outplaced (400 m2 with 30 animals/m2) |
| Adult survival after AIS treatment | 0.9 | Fraction | Personal comment, A van den Brink, WMR |
| Adult survival after deployment | 0.26–0.70 | Fraction | Didderen et al., 2018, 2019, 2020; Stichting De Rijke Noordzee, 2019 |
| Females in population | 0.2 | Fraction | Utting and Spencer, 1991; Helm and Bourne, 2004; Joyce et al., 2013; Kamermans et al., 2020. |
| Eggs per female | 1 106 | N | Utting and Spencer, 1991; Helm and Bourne, 2004; Joyce et al., 2013; Kamermans et al., 2020. |
| Fertilization success | 0.5 | Fraction | Utting and Spencer, 1991; Helm and Bourne, 2004; Joyce et al., 2013; Kamermans et al., 2020. |
| Larvae survival | 0.01 | Fraction | Utting and Spencer, 1991; Helm and Bourne, 2004; Joyce et al., 2013; Kamermans et al., 2020. |
| Settlement success | 0.004–0.06 | Fraction | Ter Hofstede et al., 2024. Depends on settlement substrate, with lowest success on steel and highest on granite. If additional settlement material is added than survival is 0.05 (cf. survival on empty mussel shells). |
| Fouling effect | 0.15 | – | Tonk et al., 2020 |
| Number of spat settled on substrate | 200–600 | N/m2 | Ter Hofstede et al., 2024. |
| Conversion | 35–260 | m2/m3 | Ter Hofstede et al., 2024. |
| Initial number of spat | 6.6 104–2.6 105 | N | Ter Hofstede et al., 2024. Is the product of volume of substrate deployed (5m3), the number of oyster spat settled (N/m2) and for each substrate a conversion (m2/m3). |
| Spat survival AIS treatment | 0.69 | Fraction | unpublished data, Ter Hofstede et al. in prep. |
| Spat survival transport | 0.85 | Fraction | unpublished data, Ter Hofstede et al. in prep. |
| Spat survival deployment | 0.40 | Fraction | unpublished data, Ter Hofstede et al. in prep. |
| Spat survival after deployment year class 0-1 | 0.15 | Fraction | Kamermans et al., 2020; Tonk et al., 2020
Both for outplaced oyster spat as well as recruited spat. |
| Spat survival after deployment year class 1-2 & 2-3 | 0.9 | Fraction | Gangnery et al., 2004; Kamermans et al., 2020 |
| Time to reproduce | 3 | years | |
| Yearly survival of reproductive adults | 0.9 | Fraction | Gangnery et al., 2004; Lynch et al., 2014 |
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