Growth, maturity, reproduction, and life expectancy in ex-situ pacific walruses (Odobenus rosmarus divergens)

BMC Zoology

Table 3 Parameter estimates, standard errors and 95% confidence intervals (CI) for allometry of weight (kg) and total length (TL, cm) 3-parameter Gompertz growth equation as follows: Weight or TL = b1exp(-exp(-k_G(age-b3))). Standard errors and CI were generated using Bootstrap (BS) estimates for weight or Jacknife (JN) estimates for total length

Parameter	Parameter Estimates	BS or JN Std Errors^a	95% Confidence Intervals
Age (y) by kg (all females)	Adj R² = 0.989 MSE = 73.9 kg
A	946.3	65.97	816.9 to 1075.6
k_G	0.1656	0.0298	0.1071 to 0.2242
T_i	4.21 (y)	0.55	3.09 to 5.32
Age (y) by kg (all males)	Adj R² = 0.988, MSE = 106 kg
A	1381	93.5	1197.8 to 1564.4
k_G	0.1948	0.0254	0.1449 to 0.2447
T_i	4.34 (y)	0.45	3.47 to 5.23
Age (y) by TL (all females)	Adj R² = 0.998
A	276.1 (cm)	10.2	255.9 to 296.4
k_G	0.2622	0.0344	0.1843 to 0.3401
T_i	-0.6037	0.085	-0.797 to -0.410
Age (y) by TL (all males)	Adj R² = 0.996
A	323.9 (cm)	6.14	309.7 to 338.0
k_G	0.2256	0.0209	0.1774 to 0.2739
T_i	-0.2699	0.2228	-0.7838 to 0.24440

^aBootstrap replacement [1000 reps] was used within Gompertz weight by age predictions, variance–covariance matrix estimates were set for cluster option around animal id. Due to small sample size, Jacknife variance–covariance estimates (VCE) were used with TL data
^bA = upper asymptotic Weight or TL can be used to approximate the adult weight of the population, k_G is the growth-rate coefficient, T_i is the timepoint at curve inflection (Figs. 1 and 2)

ISSN: 2056-3132