First record of the invasive alga Caulerpa racemosa (Caulerpales, Chlorophyta) in the Gulf of Arzew (western Algeria)

Abstract

The Japanese shore crab Hemigrapsus sanguineus is recorded for the first time from a Black Sea locality: Tomis Marina in Constanţa, Romania. The suggested vector of introduction is as adults in the hull fouling of yachts. The species has not established and salinity requirements for larval development make it unlikely that it will ever establish in the Black Sea.

Biodiversity changes along the Algerian coast (Southwest Mediterranean basin): from 1834 to 2017: A first assessment of introduced species

“…According to these authors, Salamandre and Stidia are exposed to winds, strong waves and important hydrodynamic flow, due to the prevailing west to south-west winds and east to north-east winds (ONM, 2009) that facilitate the dispersion of C. cylindracea to the gulf of Arzew. In addition, the Stidia site is a small fishing harbour where fishermen clean their nets, sometimes charged with algae, including C. cylindracea (Bachir Bouiadjra et al, 2010). In Eastern Algerian waters, C. cylindracea has been identified in the Bay of Annaba (Eastern Algeria) with an important depth range (15-27m)on soft and hard substratum (Aouissi et al, 2013).…”

“…According to Hussein (2015), C. cylindracea was found at Cap Carbon, with Asparagopsis armata and Asparagopsis taxiformis, from 0.5 to 5.0 m of depth, associated with Cystoseira amentacea in photophilic algae of the upper infralittoral. Several studies dealing with the impact of C. cylindracea on macrophyte assemblages (rocky substrate, dead Posidonia oceanica mats, coralligenous and detritic assemblages) have been conducted and indicate a decrease in the total number of species and total macrophyte coverage when C. cylindracea is present (Ceccherelli et al, 2001;Piazzi et al, 2001;2005;Balata et al, 2004;Klein & Verlaque, 2008;Antolić et al, 2008;Bachir Bouiadjra et al, 2010). C. cylindracea displays important growth potential that appears to be favoured by moderately high water temperatures (about 20°C) and waters loaded with organic matter (Seridi & Kabrane, 2010).…”

“…The Algerian coast is not immune to these invasions and many tropical and Indopacific species have been recorded over the last years (Seridi, 2007;Sartoretto et al, 2008;Kara & Oudjane, 2009;Bachir Bouiadjra et al, 2010;Kara et al, 2012;Ould Ahmed et al, 2013;Refes & Semahi, 2014;Grimes et al, 2016). Regarding the length and the importance of the Algerian coast in sub-regional and regional processes, significantly more interest should be focused on NIS and in particular invasive species and their potential effects on marine and coastal biodiversity, especially in key ecosystems such as Posidonia oceanica and coralligenous beds.…”

STANDING-STOCK BIOMASS AND DIVERSITY OF Caulerpa (Chlorophyta) IN SOLONG-ON, SIQUIJOR ISLAND, PHILIPPINES

“…Many studies have been conducted to determine the abundance and species diversity of Caulerpa around the world (Terrados & Ros 1995;Thibaut et al 2004;Verlaque et al 2004;Schembri et al 2015;Aplikioti et al 2016). Moreover, the focus on these studies were mainly on the invasiveness of the species (Cebrian & Ballesteros 2009;Bouiadjra et al 2010;Cevik et al 2007;Schembri et al 2015;Aplikioti et al 2016). Apart from an initial study on the standing stock of Caulerpa racemosa at Siquijor Island (Calumpong 1984), no similar study has been done.…”

Primera cita de la especie invasora Caulerpa cylindracea Sonder en las islas Chafarinas (África del Norte)

“…Con este trabajo se confirma por primera vez en las islas Chafarinas la presencia del alga verde invasora Caulerpa cylindracea (Figura 2), una de las invasoras más conspicuas incluida en la lista de las 100 "Peores especies exóticas invasoras" del Mediterráneo (Streftaris & Zenetos, 2006), que afecta a escala local a la diversidad de macroalgas y de praderas marinas (Klein & Verlaque, 2008;Gennaro & Piazzi, 2011 en el Golfo de Arzew (Argelia occidental; Bouiadjra et al, 2010), y se sospechaba de su presencia en las costas marroquíes (Verlaque et al, 2015). En agosto de 2018 se recogieron muestras en la isla del Congreso que fueron llevadas al laboratorio de la Estación Biológica de las islas Chafarinas para ser identificadas y preservadas; posteriormente se incluyeron en el Herbario de la Universidad de Granada (con el registro GDA-62739), y en el verano de 2019 se detectó también en las islas de Isabel II y del Rey (Tabla 1).…”