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

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...

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Bibliographic Details
Main Author: Cheng, Lanna
Other Authors: SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
Format: Text
Language:English
Published: 1997
Subjects:
Meteorology
Biology
*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
HALOBATES
SEA SURFACES
Pacific
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA332294
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA332294
Description
Summary: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.

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