How do compounds released by the green tide alga Ulvaria obscura affect development on invertebrate larvae?

• Main Author: Rivera Vázquez, Yolimar
• Format: Text
• Language: unknown
• Published: Western Washington University 2014
• Subjects: Pacific; Crassostrea gigas; Pacific oyster
• Online Access: https://dx.doi.org/10.25710/8sww-qq21; https://cedar.wwu.edu/wwuet/370

Green tides are vast accumulations of green macroalgae that, in the last decade, have become a common nuisance worldwide. Due to compounds the algae release, the blooms may negatively affect other organisms. Ulvaria obscura , a dominant contributor to green tides along the Pacific coast of the United States, produces, among other compounds, dopamine, a catecholamine and neurotransmitter known to affect settlement and metamorphosis of marine invertebrates. We tested the effects of U. obscura exudates and commercially purchased dopamine on fertilization, early development, and larval survival and morphology of the sand dollar Dendraster excentricus and Pacific oyster Crassostrea gigas . The exudate and dopamine treatments did not strongly affect fertilization success of D. excentricus or C. gigas , but they did affect early development and larval morphology of D. excentricus and C. gigas . We found significant differences in archenteron length of D. excentricus gastrulae and shell morphology of C. gigas veligers exposed to the exudates or dopamine. Morphology of D. excentricus plutei also varied significantly among the exudate treatments with larval arm lengths being affected. Our data indicate that compounds released by U. obscura can impact development and, presumably, survival of embryos and larvae, but that the effects differ between species. The impacts could affect development rates, larval dispersal, recruitment and population dynamics of invertebrate species.