The feeding of 6 copepods (Calanus finmarchicus, Acartia tonsa, Centropages hamatus, C . typicus, Labidocera aestiua, and Tortanus discaudatus) was examined with 3 different foods-a ) diatoms ( Thalassiosira flt~uiatilis) alone, b ) diatoms plus Artemia nauplii, and c ) Artemia alone-and compared with the structure of their mouth-parts. Calanus finmarchicus is predominantly an herbivore, but in...

We studied the effects of attached peritrich ciliates on the fitness of natural populations of Acartia hudsonica (Pinhey) in Stony Brook Harbor, Long Island Sound. Ciliate infection occurred during late spring, and ciliate load (No. ind.-‘) was not related to copepod age, stage, or body size. Simulated in situ experiments conducted throughout the period of abundance of A. hudsonica showed that ...