Name: Rhodoliths NIWA 2018

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Description: Distribution of Rhodoliths around New Zealand, based on presence-only data of identified specimens collected by NIWA.NIWA-internal All-Seaweeds data records extracted for rhodolith forming species for New Zealand. Data compiled in May 2018 by Neill (NIWA Wellington)Rhodoliths (known as maërl in Europe) are free-living, calcified red algae. Individual rhodoliths may start growing around a fragment of shell or rock, or they can be composed entirely of coralline algae.Very little information exists about the location, extent or ecosystem functioning of rhodolith beds in New Zealand. It is likely that they occur in the EEZ at localities characterised by strong currents within the photic zone (layer that receives sunlight) to depths of 200m depending on water clarity, particularly around the margins of reefs or elevated banks. Most investigations to date have been in diving depths less than about 30 m.Key speciesAt present three genera (Lithothamnion, Sporolithon and Lithophyllum) are known to occur in New Zealand, but only two species are commonly found in New Zealand (Sporolithon durum and Lithothamnion crispatum) (Harvey et al. 2005, Farr et al. 2009).Sporolithon durum (Red algae, Division: Rhodophyta, Family: Sporolithaceae)Lithothamnion crispatum (Red algae, Division: Rhodophyta, Family: Hapalidiaceae)

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