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In three  Gelidiella acerosa  beds on the poorly-studied eastern coasts of the Philippines, cover and biomass of this commercially important agar-producing red alga were measured. The three selected  G. acerosa  beds represented low (mean cover &lt; 5%), medium (approximately 10%) and high cover (&gt; 20%) vegetation. In each of the sites, we estimated the cover of  G. acerosa  fronds within 10 x 10 cm grids (n ranged from 33–36) in various strata. All  G. acerosa  fronds within each grid were harvested, cleaned of attached epiphytes and sediments, and subsequently, oven-dried at 60 °C to constant weight. We applied regression analysis to establish empirical relationships between cover and biomass. All linear regression lines were highly significant (p &lt; 0.001, R 2  &gt; 0.6) indicating that biomass could be confidently estimated from cover estimates: low cover (y = 0.0171x + 0.310;R 2  = 0.67, p &lt; 0.0001), medium cover (y = 0.0363x + 0.118, R 2  = 0.83, p &lt; 0.0001) and high cover (y = 0.0304x + 0.481, R 2  = 0.80, p &lt; 0.0001). Evidently though, sites with higher overall mean cover (also longer thalli) had significantly steeper regression slopes, which was most pronounced when comparing sites with the lowest (&lt; 5%) and highest (&gt; 20%) mean cover. Nevertheless, we subsequently projected a minimum annual yield from the known 51 ha along the eastern coasts amounting to, at a minimum, 23 t dw y −1 . Such yield may translate to approximately 68.8 million pesos (US$ 1.38 million) in gross sales of agar.

Estimating Biomass from the Cover of Gelidiella acerosa along the Coasts of Eastern Philippines