What reproductive trait allows most aphids to give birth to live, already developing nymphs during the growing season?
Answer
Viviparity
Viviparity is the specific reproductive strategy observed in most aphids during periods of active feeding and growth, which directly results in the birth of live, already developing nymphs rather than the laying of eggs. This trait, coupled with parthenogenesis, provides immense reproductive plasticity and speed. Since the offspring are already developed or partially developed internally when born, the female can commence reproduction almost instantly upon reaching maturity, facilitating extremely rapid population growth. This contrasts sharply with the egg-laying process associated with the sexual phase, which is typically reserved for producing overwintering stages when environmental conditions become unfavorable.
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