Artemia salina

1972

Amazonia | Andina | Caribe | Pacifico

Crustáceos

FALSO

Intencional

VERDADERO

SEM The spherical egg (cyst) of A. salina measured ca 190 µm in diameter (̄ x = 188.0 ± 8.0 μm). The smooth outer surface was devoid of any ornamentation but did show a small number of randomly distributed bumps and indentations (Figure 3 a, b). TEM Not performed in this study. Measurements estimated from studies by Morris and Afzelius (1967), Mazzini (1978) and Sugumar and Munuswamy (2006) showed an average shell thickness of 7.50 ± 0.04 µm (SD). AFM Topography of the outer shell displayed comparable morphologies to those visualised with SEM, but with more texture observed under AFM (Figure 3 c). Small bumps ranging in size from 0.3 to 1.1 µm were present on the surface. An example force – distance curve that displays how Young ̾ s modulus values were collected for a single spot on one egg is shown in Figure 3 d. The average Young ̾ s modulus ranged from 17.40 to 22.51 MPa with a mean of 20.93 ± 1.57 MPa (SD) (Table 1). Hardness values ranged from 1.90 × 10 − 2 GPa to 2.43 × 10 − 2 GPa with a mean hardness of 2.20 × 10 − 2 GPa ± 1.67 × 10 − 3 GPa (SD) (Table 2).

Phylum Arthropoda:

Previous records in the Algerian Sahara. Chegga Oasis, Chott Djeloud, Chott Ouargla (Vanhaecke et al. 1987), Chott Merouane (Zemmouri 1991; Samraoui et al. 2006), Chott Melghir (Samraoui et al. 2006), Chott Merouane (De Los Ríos-Escalante & Amarouayache 2016). Previous records in the Hauts Plateaux and coastal area. The species has been recorded in Dayet Morselli, Gharabas Lake, Sebket Djendli, Garaet Ezzemoul, Sebket Oran, Sebkhet Arzew, Salin de Bethioua (Vanhaecke et al. 1987), Sebkhet Arzew, Garaet Ezzemoul, Sebkhet Sidi Bouzian, and Mellaha Guergour El-Amri (Zemmouri 1991), Sebkhet Arzew, and Garaet Ezzemoul (Samraoui et al. 2006), Garaet Ezzemoul (Amarouayache et al. 2010), Sebket Oran, Bethioua, Setif (Ghomari 2011), Chott el Hodna, Garaet Ezzemoul, Sebkhet Sidi Chami (De Los Ríos-Escalante & Amarouayache 2016).

Comments. Along with the potential occurrence of A. tunisiana (Bowen & Sterling, 1978), the invasive A. franciscana was documented in neighboring Tunisia by Ben Naceur et al. (2010) and Morocco (Amat et al. 2005). However, there is a knowledge gap regarding the putative distribution of these two Artemia species in Algeria. In the broader Maghreb region, A. salina has been observed exclusively in semiarid to hyperarid regions (Thiéry 1987; Marrone et al. 2016; this study). This pattern suggests that A. salina does not occur in the humid and subhumid regions of the Maghreb. The reasons for this restricted distribution require further investigation.