Revisiting the Eastern Mediterranean coast of Egypt reveals new records and non-indigenous macroalgal species


Published: Mar 27, 2025
Keywords:
Non-indigenous species New records seaweeds Southeast Mediterranean Sea Egypt
SOHA SHABAKA
https://orcid.org/0000-0002-4142-8543
SHIMAA HOSNY
https://orcid.org/0000-0003-3661-3311
Abstract

This study conducted a comprehensive examination of various seaweed species from the Mediterranean Coast of Egypt, providing detailed descriptions of new records and introduced species based on their morphological characteristics. The results revealed two previously undocumented species in Egypt, Gigartina pistillata (S.G. Gmelin) Stackhouse and Palmophyllum crassum (Naccari) Rabenhorst, both commonly found in the Mediterranean Sea. Additionally, two red algae Predaea sp. and Callophyllis sp. were reported for the first time in the Eastern Mediterranean. Among non-native species, Codium repens P. Crouan et H. Crouan, a widely distributed green alga in the Red Sea and Indo-Pacific Ocean, is recorded as new in the Mediterranean Sea. Furthermore, the non indigenous brown alga Padina tetrastomatica Hauck has been reported for the first time along the Mediterranean Coast of Egypt.

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References
Aleem, A.A., 1948. The recent migration of certain indopacific algae from the Red Sea into the Mediterranean Sea. New Phytologist, 47 (1), 88-94.
Aleem, A.A., 1950. Some new records of marine algae from the Mediterranean Sea. With reference to their geographical distribution. Acta Horti Gothoburgensis, 18, 275-288.
Aleem, A.A., 1951. Algues marines de profondeur des environs d’Alexandrie (Egypte). Bulletin de La Societe Botanique de France, 98 (7-9), 249-252.
Aleem, A.A., 1978. Contributions to the study of the marine algae of the Red Sea – the alage in the neighbourhood of al-Ghardaqa, Egypt (Cyanophycea, Chlorophyta and phaeophyata). Bulletin of the Faculty of Science KAU Jeddah, 2, 73-88.
Aleem, A.A., 1984. The Suez Canal as a habitat and pathway for marine algae and seagrasses. Deep Sea Research Part A, Oceanographic Research Papers, 31 (6), 901-918.
Aleem, A.A., 1992. Caulerpa racemosa (Chlorophyta) on the Mediterranean Coast of Egypt. Phycologia, 31 (2), 205-206.
Aleem, A.A., 1993. The Marine Algae of Alexandria, Egypt, Privately published, Alexandria.
Arakaki, N., Alveal, K., Ramírez, M.E., Fredericq, S., 2011. The genus Callophyllis (Kallymeniaceae, Rhodophyta) from the central-south Chilean coast (33° to 41° S), with the description of two new species. Revista Chilena de Historia Natural, 84 (4), 481-499.
Areschoug, J.E., 1871. Alger, samlade vid Alexandria af framl. Dr. Hedenborg (Algae, collected at Alexandria by framl. Dr Hedenborg). Öfversigt Af Kongliga Vetenskaps-Akademiens Förhandlingar, 27, 929-939.
Arraj, H., Mayhoob, H., Abbas, A., 2016. First records of two Padina species (Dictyotales, Phaeophyceae) from the Syrian coast (eastern Mediterranean). Marine Biodiversity Records, 9, 1-5.
Athanasiadis, A., 1988. North Aegean Marine Algae II. Studies on the Thallus Structure and Reproduction of Nemastoma dichotomum J. Agardh and Predaea ollivieri J. Feldmann (Rhodophyta, Gigartinales). Botanica Marina, 31, 23-32.
Ballantine, D.L., Norris, J.N., 1994. Verdigellas, a new deep-water genus (Tetrasporales, Chlorophyta) from the tropical western Atlantic. Cryptogamic Botany, 4, 368-372.
Ballantine, D.L., Aponte, N.E., 1996. Verdigellas nektongammea (Tetrasporales, Chlorophyta), a new deep-water species from the Bahamas. Nova Hedwigia, 62 (3), 425-429.
Ballantine, D.L., Brooke, B.L., Johnson, G.P., 2019. Some rarely reported deep-water macroalgal species from Bonaire, Caribbean Sea, including Verdigellas discoidea sp. nov. (Palmophyllaceae, Chlorophyta) based on submersible collections. Botanica Marina, 62 (6), 587-593.
Bitar, G., Ramos-Esplá, A.A., Ocaña, O., Sghaier, Y.R., Forcada, A. et al., 2017. The introduced marine macroflora of Lebanon and its distribution on the Levantine coast. Mediterranean Marine Science, 18, 138-155.
Conde, F., López-Mielgo, C., Flores-Moya, A., 1998. The genus Predaea (Nemastomataceae, Rhodophyta) in the Alboran Sea (western Mediterranean Sea), with the description of Predaea pusilla f. alboranensis f. nov. Phycologia, 37 (5), 394-397.
Cormaci, M., Furnari, G., Alongi, G., 2014. Flora marina bentonica del Mediterraneo: Chlorophyta. Bollettino dell’Accademia Gioenia di Scienze Naturali, 47 (377), 11-436.
Cormaci, M., Furnari, G., Alongi, G., 2020. Flora marina bentonica del Mediterraneo: Rhodophyta - Rhodymeniophycidae I. Acrosymphytales, Bonnemaisoniales, Gelidiales, Gigartinales, Gracilariales. Bullettin of the Gioenia Academy of Natural Sciences of Catania, 53 (383), 11-346.
Cormaci, M., Furnari, G., Alongi, G., 2021. Flora marina bentonica del Mediterraneo: Rhodophyta - Rhodymeniophycidae II. Halymeniales, Nemastomatales, Peysson-neliales, Plocamiales, Rhodymeniales, Sebdeniales. Bullettin of the Gioenia Academy of Natural Sciences of Catania, 54, 9-342.
Delile, A.R., 1813. Description de l’Égypte ou recueile des observations et des recherches qui ont été faites en Égypte pendant l’expédition de l’armée française, publié par les orderes de Sa Majesté l’Empereur Napoléon le Grand. Histoire Naturelle. Tom. Second. Histoire Naturelle. (Fasc. 2 ’Troisème Livraison’) [Flore d’Égypte, Explication Des Planches], Pls 1-62 [1826]. Paris, 2, 145-320.
Einav, R., 2023. Proximity and distance – Review of seaweed communities and the marine environment along the coasts of the Levant Basin. Israel Journal of Plant Sciences, 70 (3-4), 213-232.
Einav, R., Guiry, M.D., Israel, Á., 2021. A revised list of seaweeds from the Red Sea (1756-2020). Israel Journal of Plant Sciences,68 (3), 175-247.
El-Tablawy, N.H., Salem, O.M.A., Štenclová, L., Mareš, J., Nikulin, A.Y. et al., 2025. Morphotaxonomic, phylogenetic and phytochemical study of the invasive, green-tide-forming macroalga Ulva tepida (Chlorophyta) firstly recorded from the African-Mediterranean coastal waters. Aquatic Botany, 198, 103867. Forsskål, P., 1775. Flora Aegyptiaca-Arabica sive descriptiones plantarum, quas per Aegyptum inferiorem et Arabium delicem detexit illustravit Petrus Forskål. Prof. Haun. Post mortem auctoris edidit Carsten Niebuhr. pp. [1]-32, [i]- xxxvi, ... [1]-219, [220, err.], map. Haun”.
Furukawa, R., Kunugi, M., Ihara, K., Takabayashi, A., Tanaka, A., 2017. Complete Chloroplast Genome Sequence of the Early Diverging Green Alga Palmophyllum crassum. Genome Announcements, 5 (10), 10-1128.
Guiry, M.D., Guiry, G.M., 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.
Katsanevakis, S., Coll, M., Piroddi, C., Steenbeek, J., Lasram, F.B.R. et al., 2014. Invading the Mediterranean Sea: Biodiversity patterns shaped by human activities. Frontiers in Marine Science, 1, 32.
Kyawt Wai, M., Soe-Htun, U., 2008. Studies on the morphology and distribution of Padina boryana Thivy (Dictyotales, Phaeophyta) from Myanmar. Universities Research Journal, 1 (4), 335-348.
Lee, H.W., Kim, M.S., 2014. Cryptic species diversity of the red algal genus Callophyllis (Kallymeniaceae, Gigartinales) from Korea. Journal of Ecology and Environment, 37 (4), 395-410.
Leliaert, F., Tronholm, A., Lemieux, C., Turmel, M., DePriest, M.S. et al., 2016. Chloroplast phylogenomic analyses reveal the deepest-branching lineage of the Chlorophyta, Palmophyllophyceae class. nov. Scientific Reports, 6 (1), 25367.
Leliaert, F., Verbruggen, H., Zechman, F.W., 2011. Into the deep: New discoveries at the base of the green plant phylogeny. BioEssays, 33 (9), 683-692.
Li, L., Wang, S., Wang, H., Sahu, S.K., Marin, B. et al., 2020. The genome of Prasinoderma coloniale unveils the existence of a third phylum within green plants. Nature Ecology & Evolution, 4 (9), 1220-1231.
Loos, L.M. van der, Bafort, Q., Bosch, S., Ballesteros, E., Bárbara, I. et al., 2024. Non-indigenous seaweeds in the Northeast Atlantic Ocean, the Mediterranean Sea and Macaronesia: a critical synthesis of diversity, spatial and temporal patterns. European Journal of Phycology, 59 (2), 127-156.
Nasr, A.H., 1940. The marine algae of Alexandria. I. A report on some marine algae collected from the vicinity of Alexandria. Fouad I Institute of Hydrobiology and Fisheries, 36, 1-33.
Nasr, A.H., 1947. Synopsis of the marine algae of the Egyptian Red Sea coast. Bulletin of the Faculty of Science, Fouad I University, 26, 25 figs, XIV plates.
Nasr, A.H., Aleem, A.A., 1948. Ecological studies of some marine algae from Alexandria. Hydrobiologia, 1, 251-281.
Ni-Ni-Win, Hanyuda, T., Draisma, S.G.A., Furnari, G., Meinesz, A., Kawai, H., 2011. Padina ditristromatica sp. nov. and Padina pavonicoides sp. nov. (Dictyotales, Phaeophyceae), two new species from the mediterranean sea based on morphological and molecular markers. European Journal of Phycology, 46 (4), 327-341.
Win, N.-N., Hanyuda, T., Draisma, S.G.A., Lim, P.-E., Phang, S.-M. et al., 2013. Taxonomy of the genus Padina (Dictyotales, Phaeophyceae) based on morphological and molecular evidences, with key to species identification. In: Taxonomy of Southeast Asian Seaweeds II. University of Malaya Press, p. 119.
Win, N.-N., Hanyuda, T., Kato, A., Shimabukuro, H., Uchimura, et al., 2021. Global Diversity and Geographic Distributions of Padina Species (Dictyotales, Phaeophyceae): New Insights Based on Molecular and Morphological Analyses. Journal of Phycology, 57 (2), 454-472.
Norris, R.E., 1957. Morphological studies on the Kallymeniaceae. University of California Publications in Botany, 28, 251-334.
Pagana, I., Marroccia, G., Marletta, G., Alongi, G., 2023. Re-examination of the distribution and species diversity of the genus Padina (Dictyotales, Phaeophyceae) in the Mediterranean Sea. Phytotaxa, 619 (3), 205-218.
Rashedy, S.H., El-Mahdy, S.M., El-Manawy, I.M., Pereira, L., 2022. Spatial and temporal variations of macroalgal vegetation in the north-western Red Sea. Botanica Marina, 65 (6), 405-418.
Rodríguez-Prieto, C., Shabaka, S.H., Shams El-Din, N., De Clerck, O., 2021. Morphological and molecular assessment of Grateloupia (Halymeniales, Rhodophyta) from Egypt revealed a new introduced species in the Mediterranean Sea, Grateloupia gibbesii. Phycologia, 60 (1), 83-95.
Saunders, G.W., Huisman, J.M., Vergés, A., Kraft, G.T., Le- Gall, L., 2017. Phylogenetic Analyses Support Recognition of Ten New Genera, Ten New Species and 16 New Combinations in the Family Kallymeniaceae (Gigartinales, Rhodophyta). Cryptogamie, Algologie, 38 (2), 79-132.
Stackhouse, J., 1797. Neris Britannica; sivefuci, Ulvae and Confervae in insulisbritanniciscrecentes: descriptis illustrate. Fascicles 1-3. Hazard, Bathoniae, Fasc, 1.pp. ix-xxiv, 31-70.
Van Den Heede, C., Coppejans, E., 1996. The genus Codium (Chlorophyta, Codiales) from Kenya, Tanzania (Zanzibar) and the Seychelles. Nova Hedwigia, 62, 389-417.
Vergés, A., Utgé, J.M., Rodríguez-Prieto, C., 2004. Life histories of Predaea ollivieri and P. pusilla (Nemastomatales, Rhodophyta). European Journal of Phycology, 39 (4), 411-421.
Verlaque, M., 1990. Contribution à l’étude du genre Predaea (Rhodophyta) en Méditerranée. Phycologia, 29 (4), 489-500.
Verlaque, M., Durand, C., Huisman, J.M., Boudouresque, C.F., Le Parco, Y., 2003. On the identity and origin of the Mediterranean invasive Caulerpa racemosa (Caulerpales, Chlorophyta). European Journal of Phycology 38 (4), 325-339.
Wynne, M.J., 2022. Checklist of benthic marine algae of the tropical and subtropical Western Atlantic: fifth revision. Nova Hedwigia Beiheft, 153, 1-180.
Zechman, F.W., Verbruggen, H., Leliaert, F., Ashworth, M., Buchheim, M.A. et al., 2010. An unrecognized ancient lineage of green plants persists in deep marine waters. Journal of Phycology, 46 (6), 1288-1295.
Zenetos, A., Gofas, S., Morri, C., Rosso, A., Violanti, D. et al., 2012. Alien species in the Mediterranean Sea by 2012. A contribution to the application of European Union’s Marine Strategy Framework Directive (MSFD). Part 2. Introduction trends and pathways. Mediterranean Marine Science, 13 (2), 328-352.