Maullinia braseltonii sp. nov. (Rhizaria, Phytomyxea, Phagomyxida) : A Cyst-forming Parasite of the Bull Kelp Durvillaea spp. (Stramenopila, Phaeophyceae, Fucales)

Help in biomass collection by David J. Patiño (UACh), Liliana A. Muñoz (University of Aberdeen (UoA)) and Alexandra Mystikou (South Atlantic Environmental Research Institute & UoA), and in conducting electron microscopy by Gillian Milne (Aberdeen Microscopy Facility) is acknowledged. Thanks are due to the three anonymous reviewers, whose comments helped to improve the earlier version of this manuscript. PM was funded by Conicyt (BecasChile N° 72130422) for PhD studies at the University of Aberdeen, and by the NERC IOF Pump-priming (scheme NE/L013223/1) for activities at the Scottish Association for Marine Sciences. RW thanks financial support from Gobierno Regional de Los Lagos (projects FIC 2012 E7259-2 and FIC 2013 BIP30234872-0) and Fondef, Conicyt (HUAM AQ12I0010), which allows the sampling expeditions at Chiloe Island by David J. Patiño, Liliana Muñoz and PM. SN was funded by the Austrian Science Fund (FWF): grant J3175-B20 (Erwin Schrödinger Fellowship) and grant Y801-B16 (START-grant). PvW is supported by the UoA, BBSRC and NERC. Also, the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011) is gratefully acknowledged for its support to FCK. Finally, we would like to thank the UoA, Shackleton Fund (FCK) and the John Cheek Fund (FCK) for supporting the expeditions of Alexandra Mystikou, PvW and FCK to the Falkland Islands.Peer reviewedPublisher PD

Effects of environmental parameters on chytrid infection prevalence of four marine diatoms : a laboratory case study

Acknowledgements: The Icelandic Research Fund (grant reference 141423-051) is gratefully acknowledged for its support to BS.Peer reviewedPublisher PD

Further expansion of the alien seaweed Caulerpa taxifolia var. distichophylla (Sonder) Verlaque, Huisman & Procacini (Ulvophyceae, Bryopsidales) in the Eastern Mediterranean Sea

We are grateful to Andreas Antoniou (Dep. of Environment, Ministry of Agriculture, Rural Development & Environment, Cyprus) for his assistance in the preparation of the illustrations. We would also like to thank Dr. Sotiris Orfanidis (NAGREF – Fisheries Research Institute, Kavala, Greece) for his valuable advice and both the DFMR and HSR / HCMR Rhodes crew and George Hatiris for their help in samplings. Special thanks are due to Dinos Leonidou (SeaQuest Divers Cyprus) for accompanying the deep dive for sampling Caulerpa at Cavo Greco. We are grateful to the Total Foundation (Paris) for its funding support to this study within the framework of the project “Brown algal ecology and biodiversity in the eastern Mediterranean Sea” and to the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011).Peer reviewedPublisher PD

Diversity and composition of algal epiphytes on the Mediterranean seagrass Cymodocea nodosa : a scale-based study

Acknowledgements This work has been conducted at the Fisheries Research Institute (ELGO DIMITRA) as an undergraduate dissertation of Soultana Tsioli at the University of Patras with supervisors Prof. E. Papastergiadou and Dr. S. Orfanidis. FCK received funding from the UK Natural Environment Research Council (NERC, program Oceans 2025 – WP 4.5 and grants NE/D521522/1 and NE/J023094/1). Sequencing was conducted at the Molecular Genetics Facility (MGF) of NERC, supported by grant MGF 154.Peer reviewedPostprin

The Mediterranean deep-water kelp Laminaria rodriguezii is an endangered species in the Adriatic Sea

Acknowledgments Thanks are due to Klaus Lüning for a gametophyte culture of L. abyssalis, and to Britta Schaffelke for a herbarium specimen of L. rodriguezii from the western Mediterranean. We are grateful to the Total Foundation (Paris) for funding this study within the framework of the project “Brown algal ecology and biodiversity in the eastern Mediterranean Sea”, and to the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011), as well as Croatian Ministry of Science, Education and Sports for supporting project “Benthic communities in the Adriatic Sea (Project ID: 0001005)”. Open access via Springer Compact AgreementPeer reviewedPublisher PD

Juvenile morphology of the large Antarctic canopy-forming brown alga, Desmarestia menziesii J. Agardh

Open Access via Springer Compact Agreement. We are grateful to the UK Natural Environment Research Council for funding to FCK (grants NE/D521522/1 and NE/J023094/1), in particular through the Collaborative Antarctic Science Scheme (Grant CASS-134, 2017) to FCK and LSP. Funding for cruise-based observations in 2019 was from US National Science Foundation award OPP-1744550 to CDA. We thank Kate Stanton, Teresa Murphy and Ben Robinson (British Antarctic Survey) for support with diving operations around Rothera in January–February 2018, and also Richard L. Moe (UC Berkeley) for locating specimens corresponding to the morphology described here in the UC collection. Special thanks are due to Charlie Bibby (Financial Times) for taking professional photographs of the unknown Desmarestia sp. in the aquarium of the Bonner Lab at Rothera (Fig. 2a). We would also like to thank Richard L. Moe (UC Berkeley) and Christian Wiencke (AWI Bremerhaven) for their very helpful reviews of this paper. Also, the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011) is gratefully acknowledged for supporting FCK. This research contributes to the SCAR Ant-ERA research programme.Peer reviewedPublisher PD

Halogens in seaweeds : Biological and Environmental Significance

Acknowledgments: We are grateful to the Kuwait Institute for Scientific Research (KISR) for PhD 1129 funding for Hanan Al-Adilah and to the European Commission for a Marie Curie International In- 1130 coming Fellowship (Horizon 2020 Research and Innovation Programme of the European Union un- 1131 der the Marie Skłodowska-Curie grant agreement No 839151) to Puja Kumari. We would equally 1132 like to thank the UK Natural Environment Research Council for their support to FCK (program 1133 Oceans 2025 – WP 4.5 and grants NE/D521522/1 and NE/J023094/1) and LJC (grant NE/N009983/1). 1134 This work also received support from the Marine Alliance for Science and Technology for Scotland 1135 pooling initiative. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and 1136 contributing institutions. MCF, FCK and HAA thank the Lorentz Center (funded by the Netherlands 1137 Organization for Scientific Research, NWO, and the University of Leiden) for the organization of 1138 the workshop ‘IODINE: Biogeochemical Cycle of Iodine and Human Health’ (Oct. 4-6, 2017) which 1139 partly inspired this review. LJC acknowledges funding from the European Research Council (ERC) 1140 under the European Union’s Horizon 2020 programme (project O3-SML; grant agreement no. 1141 833290).Peer reviewedPublisher PD

Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic

This study was supported by funding from the Falkland Islands Government. We are grateful to the scientific observers from the Falkland Islands Fisheries Department for sample collection and Beverley Reid for collecting traditional morphometric measurements and to three anonymous referees for their comments which greatly improved the manuscript. We thank the Director of Fisheries, John Barton, for supporting this work. The MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011) is gratefully acknowledged. Thanks are due to FCT/MCTES for financial support to CESAM (UID/AMB/50017/2019) through national funds and ERDF co-financing, under the Partnership Agreement for the PT2020 and Compete 2020 programsPeer reviewedPostprin

The Minute Alga Schizocladia ischiensis (Schizocladiophyceae, Ochrophyta) Isolated by Germling Emergence from 24 m Depth off Rhodes (Greece)

This research was funded by the UK Natural Environment Research Council in support to FCK(program Oceans 2025–WP 4.5 and grants NE/D521522/1 and NE/J023094/1) and the NERC National Facility for Scientific Diving (NFSD/14/02). We would also like to thank the TOTAL Foundation (Project “Brown algal biodiversity and ecology in the Eastern Mediterranean Sea”). This work also received support from AFP from the project IDEALG (France: ANR-10-BTBR-04) and from FCK from the Marine Alliance for Science and Technology for Scotland pooling initiative. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions.Peer reviewedPublisher PD

Dictyota falklandica sp. nov. (Dictyotales, Phaeophyceae) from the Falkland Islands and southernmost South America

ACKNOWLEDGEMENTS Special thanks to Paul Brickle (South Atlantic Environmental Research Institute) for hosting our expedition. FUNDING We thank the Shackleton Scholarship Fund (for travel grants to FCK and AFP to the Falkland Islands), the UK Natural Environment Research Council (program Oceans 2025 – WP 4.5 and grant NE/D521522/1), and the TOTAL Foundation (Project “Diversity of brown algae in the Eastern Mediterranean”). This work also received support from the Marine Alliance for Science and Technology for Scotland pooling initiative. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. ECM acknowledges support by the Chilean Millennium Initiative (NC120030) grant. This work makes use of resources and facilities provided by Ghent University as part of the Belgian contribution to EMBRC-ERIC (FWO GOH3817N).Peer reviewedPublisher PD