|Polychaete reproductive patterns, life cycle and life histories: an overview|
Giangrande, A. (1997). Polychaete reproductive patterns, life cycle and life histories: an overview. Oceanogr. Mar. Biol. Ann. Rev. 35: 323-386
In: Oceanography and Marine Biology: An Annual Review. Aberdeen University Press/Allen & Unwin: London. ISSN 0078-3218, more
Present knowledge of polychaete reproduction, developmental mode, gametogenesis patterns, sperm structure, and larva morphology are reported. Based on published data, some life-cycle and life-history traits are also examined and reviewed across families, in order to summarize the main life-style patterns. Polychaetes show a great diversity in reproductive traits, but some patterns can be found, and the families can be grouped within long-living iteroparous forms, semelparous forms, and short-living iteroparous forms, the first being the most common strategy. Phylogenetic constraints seem to be present especially at family level, influencing the egg-size and/or the developmental mode. Each family shows a characteristic range of egg-size and a more common developmental mode, even though different developmental modes can be found within single families, reflecting the high plasticity of this group, and the probable independent evolution of developmental mode at family level. The importance of morphological constraints is also discussed.