Accession Number : ADA332294

Title :   Correlations between Halobates Distributions and Physical Processes at the Sea Surface.

Descriptive Note : Final technical rept.

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV

Personal Author(s) : Cheng, Lanna

PDF Url : ADA332294

Report Date : NOV 1997

Pagination or Media Count : 7

Abstract : Five sea-skater species, each with a well-defined geographical range, are specifically adapted to live on the surface film. (1) Analyses of an 18-month time series showed that the range of Halobates micans and H. sericeus in the Pacific Ocean are generally separate. H. micans is restricted to a zone between 11 deg. N and 10 deg S., with amphitropical populations of H. sericeus north and south of this region. The separate ranges of the two species are associated with permanent large-scale surface circulation patterns. (2) Theoretical calculations showed that oceanic diffusion alone could carry Halobates from an initial point of origin to 2500 m in 60 days. Mutual encounter rates due to oceanic turbulence could be as high as 11/day even at low population densities (110/km2), while the encounter rate due to random movements is less than 0.6/day. An individual could find mates even when it had been carried long distances away. (3) Preliminary results from mtDNA sequences of regions of cytochrome oxidase subunit I (COI) revealed that although North Atlantic and Arabian Sea H. m/cans appear to be closely related, there was high genetic divergence between N. Pacific and Arabian Sea populations.

Descriptors :   *PHYSICAL PROPERTIES, *GEOGRAPHY, COMPUTATIONS, OCEAN SURFACE, THEORY, FILMS, TURBULENCE, POPULATION, SURFACES, CONTAINERS, LOW DENSITY, DIFFUSION, PACIFIC OCEAN, NORTH ATLANTIC OCEAN, ECOLOGY, INSECTS, OCEANOGRAPHY, ARABIAN SEA, CYTOCHROME OXIDASE.

Subject Categories : Meteorology
      Biology

Distribution Statement : APPROVED FOR PUBLIC RELEASE