FISHERY BULLETIN: VOL. 72. NO. 1 

 Table 18. — Mean abundance (No. /m^) of Pontellina spp. in meridional transects crossing the Equator. 



Region 



Longitude 



Latitude 



Source 

 of data 



.V no. 

 adults 



V no. 



adults and 



juveniles 



Number 



of 

 samples 



Sampling 

 months 



Depth, tow, net 



Indian Ocean 40°E-80°E 35°S-25°N present study 



(west) 

 Indian Oceon 80°E-nO°E 27°S-18°N present study 



(east) 



Austral-Asian 125°E135°E 12°S-12°N present study 



Seas 



Pacific Ocean 156°E-164°E )2°S-12°N present study 



160°E 04°S-16°30'N Vinogradov and 



Voronina, 1963 



176°W 14°S-13°N Vinogradov and 



Voronina, 1963 



0.1419 

 0.0863 



0.0596 



0.0230 



120°E-175°W 04°S-30°N Heinrich, 1968 



95°W 10°S15°N present study 0.0952 



0.1023 

 0.3790 

 0.1910 



168°E-155°W 20°S-20°N Sherman, 1964 0.1379 — 



174°W-160°W 06°S-21°N present study 0.0346 



158°W 07°S-21°N Sherman, 1963 0.0438 



154°W 13°S-13°N Vinogradov and — 



Voronino, 1963 



140°W 18°S-17°30'N Vinogradov and — 



Voronina, 1963 



126°W 12°S-20°N present study 0.0744 



0.1172 

 0.1600 



233 

 107 



23 



23 



17 

 21 

 91 



92°W 



20°S-10°N present study 0.0358 



59 

 15 

 13 



18 

 29 

 22 



19 



22 



Jon. -Dec. 

 (1962-65) 

 Jon. -Dec. 

 (1962-64) 



Mar .-May 

 (1961) 



Aug. -Sept. 

 (1956) 



Sep. -Dec. 



(1961) 



Sep. -Dec. 



(1961) 



W of 160°E 

 Jul. -Aug. 

 (1957) 



Eof 160°E 

 Nov. -Feb. 

 (1957-58) 



Jan. -Apr. 



(1962) 



Aug. -Sep. 



(1956) 



June-July 

 (1961) 



Sep. -Dec. 



(1961) 



Sep. -Dec. 



(1961) 



Feb. -Mar. 

 (1967) 



Feb. -Mar. 

 (1967) 



Feb. -Mar. 

 (1967) 



200-0 m, vert., 



lOSN' 



200-0 m, vert., 



lOSN' 



150-0 m, obi., 

 CalCOFI SN2 (silk) 



150-0 m, obi., 

 CalCOFI SN2 (silk) 



500-0 m, vert., 

 Juday 80 cm 



500-0 m, vert., 

 Juday 80 cm 



500-0 m, vert., 

 Juday 80 cm 



Surface, 

 POFI SN3 



150-0 m, obi., 

 CalCOFI SN2 (silk) 



Surface, 

 POFI SN3 



500-0 m, vert., 

 Juday 80 cm 



500-0 m, vert., 

 Juday 80 cm 



150-0 m, obi., 

 CalCOFI SN2 

 (nylon) 



150-0 m, obi., 

 CalCOFI SN2 

 (nylon) 



150-0 m, obi., 

 CalCOFI SN2 



(nylon) 



' lOSN = Indian Oceon Standard Net. 



* CalCOFI SN = California Cooperative Oceanic Fisheries Investigations Standard Net. 



^ POFI SN = Pacific Oceanic Fisheries Investigation Standard Net. 



Disregarding collecting and sample enumer- 

 ating procedures as well as differences among 

 the individual species, estimates of mean abun- 

 dance of Pontellina across the Pacific (Table 18) 

 vary from 0.023 to 0.379 with a median of 0.1 

 individuals i)er m-'. For einpelagic copepods this 

 appears to be a rather low and remarkably uni- 

 form set of values that varies within the 

 unusually narrow range of one order of magni- 

 tude. Summing the abundance of the three 

 species produces a notable lack of any pro- 



nounced geographical trend though the mean 

 abundance shows moderate, irregular undula- 

 tions along the equatorial belt crossing the 

 Indian and Pacific Oceans. 



Low abundance and relatively uniform dis- 

 persion throughout the geographical region 

 occupied by each species suggests that the spe- 

 cies of PoiiteUina are high-order predators. 

 This impression is supported for adults at least 

 by the exclusive presence of animal remains in 

 their stomach and the predominance of copepod 



110 



