. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 15 20 1000 Production. Years Figure 1. Energy, in kilojoules (kJ). allocated to the different compo- nents of growth and metabolism: (a) over the 20-year lifetime of a long- lived, iteroparous benthic bivalve (Ostrea ediilisY, (b) over the one-year lifetime of a short-lived semelparous cephalopod (lllex argentinus). acterized by long egg, paralarval, and juvenile phases, and by a short adult life. Feeding and metabolic rates are higher than in other molluscs (15), and empirically determined mass exponents for feeding and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 15 20 1000 Production. Years Figure 1. Energy, in kilojoules (kJ). allocated to the different compo- nents of growth and metabolism: (a) over the 20-year lifetime of a long- lived, iteroparous benthic bivalve (Ostrea ediilisY, (b) over the one-year lifetime of a short-lived semelparous cephalopod (lllex argentinus). acterized by long egg, paralarval, and juvenile phases, and by a short adult life. Feeding and metabolic rates are higher than in other molluscs (15), and empirically determined mass exponents for feeding and metabolic rate are higher than in benthic molluscs— [feeding] and [metabolism] for the squid lllex illecebrosus (16) compared with mean values of ± [feeding] and ± [metabolism] for 36 and 50 benthic species. respectively (9). The mass exponent for metabolic rate has long been thought to be close to in small organisms (< 50 mg) and approaching in larger ones (17). This exponent has been suggested to derive from the weighted sum of body surface area and volume (18). Squid appear to fall between the predicted values for large and small organisms. The exponent for feeding rate is lower than for metabolic rate, but the difference between these expo- nents in the /. illecebrosus example is less than in the longer-lived iteroparous molluscs (9). implying relatively higher scope for growth at larger body size in the squid. This is reflected in relatively high growth efficiencies (15). Somatic tissues grow for most of the squid life span, but gonad growth is rapid once sexual maturation is initi- ated. Illcx ur^entinus, with a life span of about a year, starts to mature in about 7 or 8 months and reaches full maturity by 12 months (19). Lifetime production of soma and gonad in /. argentinus has been estimated from data on growth and allometry combined with biochemical composition (19, 20). The pattern of energy allocation among soma and gonad
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
