Several dozen Arbacia found in rocky crevices and artificial recruitment modules (ARM's) (Kushner et al.
previously reported at Mission Bay, now known at San Clemente and Santa Catalina Islands; 2) Hemisquilla ensigera californiensis: increased abundances at four islands and newly appeared near the west end of Santa Cruz Island; 3) Dromidia larraburei: first island record at Anacapa Island; 4) Pteria sterna: newly found at three northern islands; 5) Arbacia incisa: previously reported from Newport Bay, now known at five islands; and 6) Centrostephanus coronatus: increased recruitment at six islands and newly appeared at Santa Rosa Island.
KEY WORDS: sea urchin, fatty acid, gonad, Paracentrotus, Arbacia, seasonal changes
The sea urchins Paracentrotus lividus (Lamarck, 1816) and Arbacia lixula (Linnaeus, 1758) are 2 species common in shallow subtidal habitats of the Mediterranean and Atlantic coasts of Spain.
Low-salinity-tolerance experiments showed threshold limits of 19 [per thousand] in Arbacia
punctulata, 23 [per thousand] in Lytechinus variegatus (Wells 1961), 21.
Consumers of sea urchins, Paracentrotus lividus and Arbacia
lixula, in shallow Mediterranean rocky reels.
Genetics of morphological variation in geographically distant population of the sea urchin, Arbacia punctulata (Lamarck).
Mitochondrial DNA and bindin gene sequence evolution among allopatric species of the sea urchin genus Arbacia.
1990) reported that different populations of Arbacia
punctulata produced eggs with different protein and lipid content that affected rate of development.
Principal Groups Species Echinoderms Astropecten brasiliensis brasiliensis Muller & Troschel 1842 Arbacia
dufresnii (Blainville 1825) Annelids Aphrodita longicomis Kinberg 1855 Bivalves Aequipecten tehuelchus (d'Orbigny 1846) Mytilus edulis platensis d'Orbigny 1846 Ostrea puelchana d'Orbigny 1841 Gastropods Adelomelon beckii (Broderip 1836) Crepidula argentina Simone, Pastorino & Penchaszadeh 2000 Crustaceans Libinia spinosa Milne Edwards 1834 Fishes Paralichtys patagonicus Jordan 1889 Percophis brasiliensis Quoy & Gaimard 1824 Squatina argentina (Marini 1930) Discopyge tschudii Heckel 1846
10 Echinodermata Arbacia
punctulata Purple sea urchin <0.