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Record #190429:
Growth and reproduction of female New Zealand sea lions / Simon A. Childerhouse, and 4 others.
Title: | Growth and reproduction of female New Zealand sea lions / Simon A. Childerhouse, and 4 others. |
Author(s): | Childerhouse, Simon A. |
Date: | 2010. |
In: | Journal of Mammalogy. (2010.), Vol. 91(1) (2010) |
Abstract: | Uses data gained from capture, ageing and subsequent resightings of female Phocarctos hookeri in Auckland Islands to describe growth patterns, investigate intersite and interannual variation in growth patterns, and estimate age-specific reproductive rates. Length and weight ranged from 134 to 197 cm and 49 to 156 kg, respectively, and females were predicted to attain 90% of asymptotic length (161.7 cm) and weight (112.0) at ages 4 and 11 years, respectively, with no significant differences found in growth rate among years, nor between two major breeding colonies. Females reproduced between ages of 3 and 26 years, with evidence of reproductive senescence starting at age 23 years. Females up to 28 years were observed, but no females over 26 years were recorded as reproductive. Mean observed reproductive rate was 0.67, which is considerably lower than assumed rates used in recent population modelling for this species and calls into question current method for estimating levels of sustainable bycatch. Low growth and reproductive rates are consistent with population occupying marginal foraging environment. These results, along with recent significant decline in pup production, suggest that current management is insufficient to ensure population stasis, let alone meet statutory goal of recovery. |
Notes: | Journal of Mammalogy. Vol. 91(1) :165-176 (2010). |
Keywords: | 599.745 -- Pinnipedia. 599.745.1 -- Otaridae: Phocarctos hookeri. 502.743 -- Conservation, animal species. 591.1 -- Animal physiology. 591.134 -- Animal growth. 591.16 -- Animal reproduction. H6 -- Zoology: mammals. (*7) -- Antarctic regions. (*78) -- Sub-Antarctic islands. (*787.7) -- Auckland Islands. |
SPRI record no.: | 190429 |
LDR 02367naa#a2200000#a#4500 001 SPRI-190429 005 20240328211310.0 007 ta 008 240328s2010####xx#a##|##|###|0||#0|eng#d 035 ## ‡aSPRI-190429 040 ## ‡aUkCU-P‡beng‡eaacr 100 1# ‡aChilderhouse, Simon A. 245 10 ‡aGrowth and reproduction of female New Zealand sea lions /‡cSimon A. Childerhouse, and 4 others. 260 ## ‡a[S.l.] :‡b[s.n.],‡c2010. 300 ## ‡ap. 165-176 :‡bill., diags., tables. 500 ## ‡aJournal of Mammalogy. Vol. 91(1) :165-176 (2010). 520 3# ‡aUses data gained from capture, ageing and subsequent resightings of female Phocarctos hookeri in Auckland Islands to describe growth patterns, investigate intersite and interannual variation in growth patterns, and estimate age-specific reproductive rates. Length and weight ranged from 134 to 197 cm and 49 to 156 kg, respectively, and females were predicted to attain 90% of asymptotic length (161.7 cm) and weight (112.0) at ages 4 and 11 years, respectively, with no significant differences found in growth rate among years, nor between two major breeding colonies. Females reproduced between ages of 3 and 26 years, with evidence of reproductive senescence starting at age 23 years. Females up to 28 years were observed, but no females over 26 years were recorded as reproductive. Mean observed reproductive rate was 0.67, which is considerably lower than assumed rates used in recent population modelling for this species and calls into question current method for estimating levels of sustainable bycatch. Low growth and reproductive rates are consistent with population occupying marginal foraging environment. These results, along with recent significant decline in pup production, suggest that current management is insufficient to ensure population stasis, let alone meet statutory goal of recovery. 650 07 ‡a599.745 -- Pinnipedia.‡2udc 650 07 ‡a599.745.1 -- Otaridae: Phocarctos hookeri.‡2udc 650 07 ‡a502.743 -- Conservation, animal species.‡2udc 650 07 ‡a591.1 -- Animal physiology.‡2udc 650 07 ‡a591.134 -- Animal growth.‡2udc 650 07 ‡a591.16 -- Animal reproduction.‡2udc 650 07 ‡aH6 -- Zoology: mammals.‡2local 651 #7 ‡a(*7) -- Antarctic regions.‡2udc 651 #7 ‡a(*78) -- Sub-Antarctic islands.‡2udc 651 #7 ‡a(*787.7) -- Auckland Islands.‡2udc 773 0# ‡7nnas ‡tJournal of Mammalogy. ‡gVol. 91(1) (2010) ‡wSPRI-22378 916 ## ‡aHS 917 ## ‡aUnenhanced record from Muscat, imported 2019 948 3# ‡a20240328 ‡bHS