Accession Number:

ADA609781

Title:

Onset of Dormancy in the Copepod Calanus pacificus californicus Off Southern California

Descriptive Note:

Annual rept.

Corporate Author:

SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE LIFE RESEARCH GROUP

Personal Author(s):

Report Date:

2000-09-30

Pagination or Media Count:

6.0

Abstract:

Our long-range goals are to understand and, as feasible, predict the distribution and abundance of pelagic organisms, particularly in regard to their physical environment and its changes. The objective of the proposed research is to identify the mechanism that controls onset of dormancy in open-ocean copepods and thus explain spatial and temporal variation in dormancy response. Specifically we will examine whether the interaction between environmental conditions off southern California and variation in threshold stimuli for onset of dormancy within the Calanus pacificus population in this region can explain why part of the population becomes dormant during fall and winter while part of the population remains active and reproduces at the surface year-round. The proposed research will contribute to understanding of the following questions 1 How does dormancy response affect population dynamics of open-ocean copepods 2 What effect do short-term and long-term environmental changes have on dormancy response of open-ocean copepods 3 Do latitudinal differences in dormancy response of populations with broad ranges result from latitudinal differences in environmental stimuli alone i.e. is population response to stimuli the same throughout the range 4 What controls the buildup and dispersal of deep aggregations of dormant copepods

Subject Categories:

  • Biology
  • Anatomy and Physiology
  • Biological Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE