50 100 150 200 



KILOMETERS 



68° 



40- 



36- 



Figure 1.— Number designations and positions of Northeast Monitoring Program (NEMP) benthic stations where gammaridean am- 



phipods were sampled during the survey. 



but A. agassizi collected at the same times were not. 

 Except for A. agassizi, all the species with ciliate 

 infections were rare (Table 2). The most numerous 

 species collected, after A. agassizi, were Leptochei- 

 rus pinguis Stimpson, which made up 11% of the 

 total collected (2,655/24,244), and Unciola species 

 (probably all U. irrorata Say and U. inermis Shoe- 



maker), which made up 10% of the total (2,356/ 

 24,244). Despite their abundance, these species were 

 never found infected with ciliates. Considering all 

 amphipods sectioned and examined, overall 

 prevalence of ciliate infection was 0.6% (41/7,363). 

 Light infections consisted mainly of large ciliates. 

 Heavier infections had medium to small ciliates, but 



205 



