Predictions & Data for this entry
| Model: std | climate: MB, MC | migrate: | phylum: |
| COMPLETE = 2.2 | ecozone: MC | food: biP | class: |
| MRE = 0.044 | habitat: 0jMp, jiMb | gender: Hh | order: |
| SMSE = 0.000 | embryo: Ms | reprod: Ob | family: |
Zero-variate data
| Data | Observed | Predicted | (RE) | Unit | Description | Reference |
|---|---|---|---|---|---|---|
| ab | 2 | 1.993 | (0.003669) | d | age at birth | guess |
| tj | 13 | 12.89 | (0.008093) | d | time since at birth at metam | Herr1979 |
| tp | 200 | 197.3 | (0.01345) | d | time since birth at puberty | guess |
| am | 365 | 369 | (0.01098) | d | life span | guess |
| Li | 13 | 13.01 | (0.0008459) | cm | ultimate total length | Herr1979 |
| Wwb | 1.1e-07 | 1.057e-07 | (0.03879) | g | wet weight at birth | Emig2003 |
| Wwi | 0.1 | 0.09832 | (0.01681) | g | ultimate wet weight | Herr1979 |
| Ri | 0.1918 | 0.2063 | (0.07548) | #/d | maximum reprod rate | guess |
Uni- and bivariate data
| Data | Figure | Independent variable | Dependent variable | (RE) | Reference |
|---|---|---|---|---|---|
| tW |  | time since birth | wet weight | (0.1186) | Herr1979 |
Pseudo-data at Tref = 20°C
| Data | Generalised animal | Phoronis psammophila | Unit | Description |
|---|---|---|---|---|
| v | 0.02 | 0.02 | cm/d | energy conductance |
| kap | 0.8 | 0.9999 | - | allocation fraction to soma |
| kap_R | 0.95 | 0.475 | - | reproduction efficiency |
| p_M | 18 | 13.38 | J/d.cm^3 | vol-spec som maint |
| k_J | 0.002 | 0.002153 | 1/d | maturity maint rate coefficient |
| kap_G | 0.8 | 0.7987 | - | growth efficiency |
| k | 0.3 | 0.2951 | - | maintenance ratio |
Discussion
- The analysis assumes that pre- and post-metamorphic stages have the same parameters; this is probably incorrect and model abj probably applies
- The assumed life span is probably much too long and the measured reproduction rate much too small
- In view of low somatic maintenance, pseudodata k_J = 0.002 1/d is replaced by pseudodata k = 0.3
- mod_3: lengths converted to weights
Facts
- Occurs at depths between 0 and 10 (till 100) m; Hermaphroditic. Giant nerve cells (Ref: Emig1979)
- Asexual reproduction is by transverse fission after sufficient gonadic material had been formed. The actinotroch larve swims for about 20 days, settles on the seabed and undergoes a catastrophic metamorphosis in 30 minutes (Ref: Wiki)
Bibliography