ALBERT

Description: Cold-water corals (CWC) build complex, three-dimensional habitats for diverse communities of associated species. In spite of their importance, very little is known on their reproductive biology. In the Patagonian fjords of Chile, three caryophylliid CWC abound: Desmophyllum dianthus Es-per 1794 along with the recently described Caryophyllia huinayensis Cairns et al. 2005 and Tethocyathus endesa Cairns et al. 2005. This study reports first in situ and in vitro observations of the early life history of the latter two species along with in vitro growth data of juvenile C. huina-yensis. Both are brooding species with translucent tissues, which allowed us to detect and monitor larval development in the gastrovascular system of living specimens. In situ observations from summer 2017 showed between 15 and 25 milky white reproductive stages in the tentacle portion of the gastrovascular cavity of one adult specimen. Up to five younger, round stages were ob-served in groups in the tips of the tentacles. Small planulae of 1.13-1.28 mm length were observed in the tips of the tentacles or organized radially around the mouth. Observations from C. huina-yensis maintained (〉 1 yr) in an aquarium system showed that the 620 µm large orange planulae may swim with a velocity of 230 µm s-1 and thus may move from the tentacle tip to the mouth within less than a minute and thereafter reappear in the same or another tentacle in the similar time. After release larvae were found to be negatively buoyant, crawl along the substrate and settle between four and 16 days. Recently settled juveniles increased their basal disc diameter with a rate of 10 µm d-1. After 30 months of maintenance in the aquarium system (Temperature: 12.5 °C, Salinity 32, pH 8, argonite 〉1, feed with Artemia salina nauplii twice a week) recruits may gain 4.22 (+/-) 0.03 mm yr-1 in diameter and reach the mean size observed for adults in the field after three years. Research on the early life history of CWC is important to understand larval dispersal and connectivity of populations threatened by a changing climate and increasing eutrophication by expanding salmon farming operations.

Description: Cold-water corals play an important role as ecosystem engineers by providing the three-dimensional structural basis and habitat for a rich associated fauna. In southern Chile, the cold-water scleractinian Desmophyllum dianthus populates the steep walls of Comau Fjord. Where its principal energy source, the zooplankton, is less abundant in winter. This coral specie is often associated with filter-feeders, but the nature and possible trophic significance of this relationship remains enigmatic. Dense belts of the mussel Aulacomya atra and the brachiopod Magellania venosa thrive in the productive waters above and between D. dianthus, and both, visual observation and diver-operated push net samples revealed a rain of biodeposits (faeces and pseudofaeces) from these filter-feeders to the corals. This study aims to determine if the conversion by filter-feeders of microscopic plankton inaccessible to corals to macroscopic strings of faeces and pseudofaeces accessible to the corals’ tentacles may represent a new and so far overlooked trophic link channeling surface production to the corals. Preliminary in vitro experiments show that D. dianthus ingests biodeposits of the mussel Mytilus edulis, but only after the consumption of juvenile krill (Euphausia pacifica). This indicates that biodeposits of active filter feeders may play a role as a food supplement for corals. Follow-up experiments with biodeposits produced under natural conditions by the native filter-feeder community are expected to compound the evidence.