accessory species

accessory species

[ak′ses·ə·rē ′spē·shēz]
(ecology)
A species comprising 25-50% of a community.
References in periodicals archive ?
The Government has issued an order in Dirio da Repblica authorizing purse seine vessels to catch accessory species in a percentage higher than 20% allowed by law.
In this study, catches from both target and accessory species tended to be higher in the net without TED.
and only an accessory species Cantareus apertus and one accidental species Cernuella virgata are met in this station with occurrence rate of about 30.
The accessory species of this study were mostly members of the Ophiderinae, whereas in Rio Grande do Sul they were distributed among all subfamilies.
2002): constant species (X)= present in more than 50% of collections; accessory species (Y)= present in 25% to 50% of collections and accidental species (Z)= present in less than 25% of collections.
In general it must be said that accessory species are quite rare in the Alabashka pegmatites, in comparison with other well-known pegmatite districts of the world.
These months presented similarities in biodiversity and in the frequency of constant and accessory species.