Te Vega Cruise #20

Dates Fall 1968
Chief Scientist Ellsworth H. Wheeler, Jr.
Senior Scientists John S. Pearse, Jack Littlepage
Junior Scientists Jo Ann Aiello, Steven S. Amesbury, David W. Frame, Diane M. Harmon, George J. Kenagy, Thomas Malone, Margaret S. McFadien, Carrol Mountain, Francisco Pineda P., Michael C. Swift
Teaching Assistants Bruce Robison
Marine Technicians C. Ray Chesbrough
Captain Jerzy Chylinski
Doctor
Ports of call Guayaquil, Ecuador to San Diego, California

Narrative by Wheeler.

September 17 to November 29, Guayaquil, Ecuador to San Diego, California. September 20-26, first 6-day deep station. September 26-27, Wreck Bay, San Cristobal Island, Galapagos. September 27, Roca Kicker. September 28, Academy Bay, Santa Cruz Island, Galapagos. September 29, on Santa Cruz Island. September 29-30, to Post Office Bay, Floreana. September 30-October 10, Floreana to Buenaventura, Colombia, with deep-sea sampling enroute. October 2, crossed the Equator. October 12-22, Buenaventura to Chatham Bay, Cocos Island, with deep-sea sampling enroute. October 22-31, Cocos to La Union, El Salvador, with sampling enroute. November 2-14?, La Union to Acapulco, Mexico. November 15-22, Acapulco to Cabo San Lucas. November 22-29, Cabo San Lucas to San Diego via Tortola Bay. Cruise ended December 1 with departure of the scientific party.

Thank You letter fom Malvern Gilmartin to John Pearse

Publications

Amesbury, Steven S. (1969) The physical environment and feeding habits of the hatchetfish Sternoptyx diaphana Hermann in the eastern tropical Pacific Ocean. Thesis. University of Arizona. SOE CRUISE 20

Fields, W. G. and Gauley, V. A. (1972). A report on cephalopods collected by Stanford oceanographic expedition 20 to the eastern tropical Pacific Ocean September to November 1968. The Veliger. 15: 113—118. SOE CRUISE 20

McFadien, M. S. 1973. Zoogeography and ecology of seven species of Panamic-Pacific Scaphopoda. The Veliger, vol. 15, no. 4, pp340-347. SOE CRUISE 20

Pearse, J.S. 1968. Gametogenesis and reproduction in several abyssal and shallow water echinoderms of the Eastern Tropical Pacific. Stanford Oceanogr. Exp. Cruise 20, Te Vega Rep.: 225-234. (Bd, Ec, Eg, ZP). SOE CRUISE 20

Pearse, J. S. and Timm, R. W. (1971). Juvenile nematodes (Echinocephalus pseudouncinatus) in the gonads of sea urchins (Centrostephanus coronatus) and their effect on host gametogenesis. Biological Bulletin. 140(1):95-103. SOE CRUISE 20

Pearse, J. S., (1972) A monthly reproductive rhythm in the diadematid sea urchin Centrostephanus coronatus Verill. Journal of Experimental Marine Biology and Ecology, 8 (2) 167-186. SOE CRUISE 20

Reduced Data Set

TE VEGA #20 – RESEARCH REPORTS

Malone, Thomas (1968) Oceanography of the Eastern Equatorial Pacific.

Mountain, Carrol (1968) Distribution of Nitrite and Nitrate in the Eastern Tropical Pacific.

Swift, Michael C. (1968) The effect of subthermocline water, N03, and PO4 on primary productivity in the Eastern Tropical Pacific .

Malone, Thomas (1968) Nannoplankton and netplankton primary productivity in the Eastern Tropical Pacific.

Frame, David W. (1968) Food preferences, growth, and taxonomic characteristics of selected Sciaenidae species from the South and Central American Pacific Coast.

Kenagy, George J. (1968) Surface zooplankton densities in the Eastern Tropical Pacific.

Littlepage , Jack (1968) Summary of research on the biochemical composition of zooplankton.

Pineda P., Francisco (1968) The Chaetognatha of Stanford Oceanographic Expedition 20

Kenagy, George J. (1968) Observations on Eastern Tropical Pacific zooplankton communities.

Wheeler, Ellsworth H. (1968) Notes on deep-sea calanoid Copepoda.

Robison, Bruce (1968) Midwater and abyssopelagic fishes from the Eastern Tropical Pacific.

Amesbury, Steven S (1968) Sternoptychidae of the Eastern Tropical Pacific.

Pearse, John (1968) Sampling abyssal animals.

McFadien, Margaret S. (1968) Diversity, abundance and distribution of Eastern Tropical Pacific Scaphopoda.

Harmon, Diane M. (1968) Nutritional patterns in bacteria from the deep Equatorial Pacific.

Pearse, John (1968) Gametogenesis and reproduction in several abyssal and shallow water Echinoderms of Eastern Tropical Pacific.

Aiello, Jo Ann (1968) Comparison of several level-bottom, shallow-water and abyssal communities in the Eastern Tropical Pacific.