Predictions & Data for this entry

Model: std climate: Cfb, Dfb, Dfc migrate: phylum:
COMPLETE = 3.2 ecozone: THp food: bjP, biD, jiCi, jiS class:
MRE = 0.089 habitat: 0iFr, 0iFl gender: D order:
SMSE = 0.021 embryo: Fbf reprod: O family:

Zero-variate data

Data Observed Predicted (RE) Unit Description Reference
ah 154 148.4 (0.03608) d age at hatching PoliSimo2004
ab 161 168.8 (0.04857) d age at birth HessTaug1987
tp 1460 1532 (0.04949) d time since birth at puberty for females Abra1971
tpm 1095 1095 (4.746e-05) d time since birth at puberty for males Abra1971
am 5475 5475 (7.633e-05) d life span HoldMalc2002, SoutHold2006
Lh 0.9 0.9131 (0.01454) cm total length at hatching HoldMalc2002
Lb 1.2 1.183 (0.01417) cm total length at birth (stage 2) HoldMalc2002
Lp 7.7 7.574 (0.0164) cm total length at puberty Abra1971
Li 12 12.5 (0.04146) cm ultimate total length for females HoldMalc2002
Lim 16 14.54 (0.09122) cm ultimate total length for males HoldMalc2002
L2 4.7 4.52 (0.03821) cm total length at 2yr for females Abra1971
L2m 4.9 4.866 (0.006986) cm total length at 2yr for males Abra1971
Wwb 0.014 0.0155 (0.1075) g dry weight at birth Abra1971
Wwp 18 17.07 (0.05183) g wet weight at puberty Abra1971
Wwi 68.2 76.69 (0.1244) g ultimate wet weight for females MaguHudi2004
Wwim 161.5 133 (0.1766) g ultimate wet weight for males MaguHudi2004
Ri 0.5479 0.6092 (0.1117) #/d max reprod rate HoldMalc2002

Uni- and bivariate data

Data Figure Independent variable Dependent variable (RE) Reference
tL_VLDf Females with veg, meat diet at low & high density age total length (0.1052) Bast2014
tL_VHDf Females with veg, meat diet at low & high density age total length (0.0515) Bast2014
tL_MLDf Females with veg, meat diet at low & high density age total length (0.07671) Bast2014
tL_MHDf Females with veg, meat diet at low & high density age total length (0.05082) Bast2014
tL_VLDm age total length (0.05617) Bast2014
tL_VHDm age total length (0.03415) Bast2014
tL_MLDm age total length (0.07735) Bast2014
tL_MHDm age total length (0.04143) Bast2014
tWw_VLDf age wet weight (0.1873) Bast2014
tWw_VHDf age wet weight (0.074) Bast2014
tWw_MLDf age wet weight (0.1777) Bast2014
tWw_MHDf age wet weight (0.06085) Bast2014
tWw_VLDm age wet weight (0.1036) Bast2014
tWw_VHDm age wet weight (0.1661) Bast2014
tWw_MLDm age wet weight (0.1501) Bast2014
tWw_MHDm age wet weight (0.1161) Bast2014
tL_Westf age total length (0.04759) WestPurs1982
tL_Westm age total length (0.1249) WestPurs1982
tWw_Poli1 age wet weight (0.2271) PoliSimo2004
tWw_Poli2 age wet weight (0.226) PoliSimo2004
cLW_Hud_fem carapace length wet weight (0.06108) HudiJank2011
cLW_Hud_m carapace length wet weight (0.06412) HudiJank2011
LWw_Mag_fem total length wet weight (0.1375) MaguHudi2004
LWw_Mag_m total length wet weight (0.1496) MaguHudi2004
LN total length number of eggs (0.2712) Abra1971
LW total length wet weight (0.05768) Abra1971

Pseudo-data at Tref = 20°C

Data Generalised animal Astacus astacus Unit Description
v 0.02 0.02285 cm/d energy conductance
kap 0.8 0.9062 - allocation fraction to soma
kap_R 0.95 0.95 - reproduction efficiency
p_M 18 42.62 J/d.cm^3 vol-spec som maint
k_J 0.002 0.002 1/d maturity maint rate coefficient
kap_G 0.8 0.8017 - growth efficiency

Discussion

  • Males are assumed to differ from females by {p_Am} and E_Hp only.
  • mod_1: Added zerovariate data: ah, Lh, Lb, Ri; and datasets for growth - tL_f, tWw_f for males and females, and datasets for carapaca and total length vs wet weight for males and females. (COMPLETE level bumped from 2.5 up to 3.2). Added facts F3, F4
  • mod_1: Model std is applied, instead of abj, since freshwater crayfish, unlike marine decapods, have no larval stage

Facts

  • Eggs are glued to hairs under the abdome; after hatching the young continue to cling to the hairs, moult 2 or 3 times and a miniature crayfish walks off (Ref: KoesSoes2011)
  • TL 11.5 cm weighs 60 g (Ref: Mull1973)
  • mod_1: Incubation in nature is relatively long, as for other Astacidae: lasts 160 to 270 days (1500 to 2200 thermal units) and includes a cold diapause (Table 13.1 in Holdich 2002).Skipping the diapause by warmer temperatures shortens the incubation but can reduce later survival and growth. (Ref: HoldMalc2002)
  • mod_1: Adaptations to freshwater habitat includes relatively few yolk-rich eggs combined with the loss of free larvae (direct development), and brood care pattern. (Ref: HoldMalc2002)

Bibliography

Citation