Table 2. 



—Mean numbers and percentage composition of zooplankton groups per 100 m. ^ of water 

 strained in each season. Gulf of Maine coastal waters, 1967 and 1968 



Year and group 



Winter 



Spring 



Summer 



Autumn 



Number Percent Nuniber Percent Number Percent Number Percent 



1967: 

 Holoplankton: 



Amphipoda 



Appendicularia(*) 



Chaetognatha( *) 



Cladocera(* ) 



Copepoda(*) 



Euphausiacea(*) 



Medusae 



Pteropoda( *) 



Siphonophora 



Meroplankton: 



Annelida larvae 



Brachyura larvae(* ) . . . . 

 Cirripedia larvae(*)... 



Crustacean eggs( *) 



Crustacean nauplii( *) . . 



Decapoda larvae(* ) 



Fish eggs(* ) 



Gastropoda larvae( *)-'-.. 



Pelecypoda larvae 



Pycnogonoida 



1968: 



Holoplankton: 



Amphipoda <1 <1 2 



Appendicular ia( *) 7, 960 21 1,323 



Chaetognatha{- ) 11 < 1 16 < 1 11 



Cladocera( *) 1, 484 4 1, 608 



Copepoda(*) 3,710 98 23,829 62 5,434 



Euphausiacea(*) 412 1 186 



Isopoda <1 <1 



Medusae 24 <1 54 



Pteropoda( *) 62 2 232 < 1 39 



Siphonophora 1 <1 



Meroplanlrton: 



Annelida larvae 122 <1 1 



Brachyura larvae(*) 19 < 1 149 



Cirripedia larvae(*) 2,026 5 226 



Crustacean eggs( *) 145 < 1 1,023 



Crustacean nauplii( *) 5 < 1 509 



Decapoda larvae(*) 1,856 5 318 



Echinodermata larvae 28 < 1 



Fish eggs(* ) 4 < 1 298 < 1 479 



Gastropoda larvae(*) 12 <1 141 



(*) Constituting greater than 1 percent of the zooplankton in a season. 

 ■"■ Larval decapods other than brachyuran larvae. 



of both years, and decapod larvae in peak 

 numbers in spring 1968. The remaining groups 

 were at an annual maximum in summer (table 2). 



Copepod Abundance and Distribution 



The samples had 19 species and groups of 

 copepods; 5 were common (>50/lOO m. ^/year) 



in 1967, and 11 in 1968 {table 3). The most nu- 

 merous species were Calanus finmarchicus in 

 winter, spring, and summer, and C entropages 

 typicus in autunnn. The abundance of copepods 

 generally decreased from west to east. Notable 

 exceptions were the high concentrations of 

 C. finmarchicus , Pseudocalanus minutus , Tor- 

 tanus discaudatus , and Temora longicornis , in 



