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Fig. 1. Variation of development and growth in juveniles and adolescents. (A,B)
Rather synchronous development of lecithotrophic stage-2 juveniles (arrow)
from dam A on the maternal pleopods (A) and in net culture (B). Arrowhead in B
denotes yolk reserves. Scale bars, 3 mm. (C,D) Size differences among feeding
batch-mates removed from brooding dam A at day 35 after hatching: the juvenile
in C is in stage 3 whilst its sib in D is already in stage 5. Markers in D
denote traits and organs investigated in juveniles: carapace length (black
line), total length (white line), outer branch of 1st antenna (arrowhead)
bearing the olfactory aesthetascs, and chelae of pereiopods 1, 2 and 3
(arrows) bearing the gustatory corrugated setae. Scale bars, 2 mm. (E)
Development of batch-mates (S1–S12) from dam
B5 raised individually in a 12-well microplate from late
embryogenesis to juvenile stage 5 (Juv 5). Development is rather uniform in
embryos and non-feeding stages 1 and 2 but becomes heterogeneous after onset
of feeding in stage 3. (F) Growth differences of five juveniles from dam B
that were size-matched in stage 6 and then cultured in an aquarium without
shelter. 34 days later, one specimen was in stage 11, one in stage 9 and three
were in stage 7. Scale bar, 4 mm. (G) Temporal development of size variation
in eight adolescent batch-mates (B1–B8) from dam B
reared communally under aquarium conditions. Specimens are numbered according
to sequence of egg-laying, which started in B1 at day 158 after
hatching.
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