caa a22 4500 445820306 CHVBK 20180317145242.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00338-011-0724-8 doi (NATIONALLICENCE)springer-10.1007/s00338-011-0724-8 Contrasting reproductive strategies in three deep-sea octocorals from eastern Canada: Primnoa resedaeformis , Keratoisis ornata , and Anthomastus grandiflorus [Elektronische Daten] [A. Mercier, J.-F. Hamel] Various aspects of reproduction were studied in three deep-sea octocorals belonging to the order Alcyonacea that co-occur at bathyal depths on the continental edge and the slope of eastern Canada. The main goals were to expand knowledge of deep-water heterotrophic corals and ascertain whether reproductive strategies could explain the known patterns of occurrence. Anthomastus grandiflorus is a gonochoric species with a female-biased sex ratio that exhibits internal fertilization and brooding of planula larvae. Conversely, Primnoa resedaeformis and Keratoisis ornata rely on broadcast spawning and external fertilization; their sexuality remains undetermined as spermatocysts were not found. In P. resedaeformis, the presence of mixed size classes of oocytes in samples from all months, depths, and locations studied suggests continuous oogenesis or overlapping development of oocyte cohorts, indicative of a gametogenic cycle spanning more than a year. No evidence of periodicity was found in this species, although it could have been masked by the striking bathymetric variation in potential relative fecundity (oocytes polyp−1). The two other octocorals displayed a clear annual breeding pattern. Spawning in K. ornata and larval release in A. grandiflorus occurred in late summer and fall, respectively, possibly in response to environmental factors, as supported by shifts in the reproductive peak of A. grandiflorus across latitudes. The three species are presumed to share a nonfeeding larval mode, and data on their reproductive potential do not present any striking disparities. Published data on bycatches and video surveys in Atlantic Canada indicate that the gonochoric brooder A. grandiflorus is more widely distributed than the two free spawners, P. resedaeformis and K. ornata, which is contrary to common dispersal potential paradigms. Springer-Verlag, 2011 Octocorals nationallicence Reproduction nationallicence Gametogenesis nationallicence Spawning nationallicence Deep-sea nationallicence Cold-water nationallicence Mercier A. Ocean Sciences Centre, Memorial University, A1C 5S7, St. John's, NL, Canada aut Hamel J.-F Society for the Exploration and Valuing of the Environment (SEVE), 21 Phils Hill Road, A1M 2B7, Portugal Cove-St. Philips, NL, Canada aut Coral Reefs Springer-Verlag 30/2(2011-06-01), 337-350 0722-4028 30:2<337 2011 30 338 https://doi.org/10.1007/s00338-011-0724-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00338-011-0724-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mercier A. Ocean Sciences Centre, Memorial University, A1C 5S7, St. John's, NL, Canada aut NATIONALLICENCE 700 1- Hamel J.-F Society for the Exploration and Valuing of the Environment (SEVE), 21 Phils Hill Road, A1M 2B7, Portugal Cove-St. Philips, NL, Canada aut NATIONALLICENCE 773 0- Coral Reefs Springer-Verlag 30/2(2011-06-01), 337-350 0722-4028 30:2<337 2011 30 338 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer