The potential effects of climate change on southern calamary in Tasmanian waters: biology, ecology and fisheries

Figure 4: Schematic diagram showing potential effects of elevated temperatures on the life-history of southern calamary. A) Warmer temperatures are expected to reduce embryonic duration, reduce hatchling size, increase growth rates, and shorten the overall life-span. Maturation is at smaller sizes and younger ages. B) Cooler temperatures result in a longer embryonic duration, larger hatchlings, and slower growth over a longer life-span, leading to a larger final size. Maturation is at larger sizes and older ages.

Figure 5: Diagrammatic representation of fluctuations in biomass of squid over a one year period. A) Aggregative spawning over an extended spawning season of up to several months resulting in successive waves of recruitment, however, a clear peak is present, B) Breeding season is extended beyond a few months as the life-span of squid becomes shorter, although seasonal peaks in biomass production are still evident, C) Uncoupling of seasonal and synchronous spawning cues resulting in aseasonal continuous recruitment with no obvious peaks in biomass production (as occurs in tropical environments). This diagram is largely adapted from that of Boyle and Boletzky 1996.