4-38 



Other calanoid species that exhibited substantial seasonal 

 abundance peaks may be regarded as subdominants to the Acartia species. 

 This subdominant category includes Pseudodiaptomus coronatus and Pseudo- 

 calanus minutus , which appear in most years to be prominent members of 

 the New Haven Harbor zooplankton assemblage during colder months (Novem- 

 ber through April; Table 4-5) . Pseudodiaptomus coronatus was also 

 reported as a prominent copepod at Millstone Point (Figure 4-15b) . 

 Pseudocalanus minutus showed a similar pattern of winter dominance among 

 copepods in greater Long Island Sound and comprised about the same 

 proportion of total zooplankton at Millstone Point as at New Haven Har- 

 bor and Long Island Sound (Figure 4-15) . 



Abundance of Temora longicornis appears to have increased in 

 recent years (Figure 4-17) . In I'ilA, T. longicornis was present in New 

 Haven Harbor zooplankton collections only from February through June. 

 Peak abundance has typically occurred in late spring; maximum densities 

 increased with each year. In 1977, T. longicornis became numerically 

 the third most important copepod species and ranked sixth among all 

 zooplankton categories differentiated. These recent findings are 

 consistent with Long Island Sound and Millstone Point data which indi- 

 cate Temora longicornis as a late spring dominant (Figure 4-15a) (Mill- 

 stone 1973-1975). At Millstone, Temora longicornis comprised approxi- 

 mately the same proportion of the total zooplankton as seen by Deevey 

 (1956) in Long Island Sound. 



Predictably, early copepod developmental stages (i.e. , nauplii 

 and copepodites) outranked adult forms in niimerical abundance (Table 4- 

 4) . Nauplii constitute the earliest of developmental stages and can 

 reasonably be expected to have been far more abundant than copepodites 

 (intermediate developmental stages) on a yearly average basis. That 

 this was not reflected in the data (Figure 4-18) from 1975 through 1977 

 may be due to selective sampling of organisms of larger body size. 



In addition to the calanoid copepod species discussed above, 

 small cyclopoid copepods of the genus Oithona have occurred in New Haven 



(Text continued on page 4-43) 



