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COMPARISON OF THE EARLY LIFE HISTORY...

BUTLER, JOHN LAWTON.

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COMPARISON OF THE EARLY LIFE HISTORY PARAMETERS OF PACIFIC SARDINE AND NORTHERN ANCHOVY AND IMPLICATIONS FOR SPECIES INTERACTIONS.

Record Type:	Electronic resources : Monograph/item
Title/Author:	COMPARISON OF THE EARLY LIFE HISTORY PARAMETERS OF PACIFIC SARDINE AND NORTHERN ANCHOVY AND IMPLICATIONS FOR SPECIES INTERACTIONS./
Author:	BUTLER, JOHN LAWTON.
Description:	261 p.
Notes:	Source: Dissertation Abstracts International, Volume: 48-02, Section: B, page: 0321.
Contained By:	Dissertation Abstracts International48-02B.
Subject:	Biology, Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8712279

COMPARISON OF THE EARLY LIFE HISTORY PARAMETERS OF PACIFIC SARDINE AND NORTHERN ANCHOVY AND IMPLICATIONS FOR SPECIES INTERACTIONS.
BUTLER, JOHN LAWTON.

COMPARISON OF THE EARLY LIFE HISTORY PARAMETERS OF PACIFIC SARDINE AND NORTHERN ANCHOVY AND IMPLICATIONS FOR SPECIES INTERACTIONS. - 261 p.

Source: Dissertation Abstracts International, Volume: 48-02, Section: B, page: 0321.

Thesis (Ph.D.)--University of California, San Diego, 1987.

Early life history parameters of Pacific sardine, Sardinops sagax, and northern anchovy, Engraulis mordax, were investigated to understand the processes of recruitment and the fluctuations in abundance of these pelagic fish stocks. Larval growth and mortality were compared in the context of life tables.Subjects--Topical Terms:

783691
Biology, Oceanography.

COMPARISON OF THE EARLY LIFE HISTORY PARAMETERS OF PACIFIC SARDINE AND NORTHERN ANCHOVY AND IMPLICATIONS FOR SPECIES INTERACTIONS.
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035 $a (UMI)AAI8712279
035 $a AAI8712279
040 $a UMI $c UMI
100 1 $a BUTLER, JOHN LAWTON. $3 1924430
245 1 0 $a COMPARISON OF THE EARLY LIFE HISTORY PARAMETERS OF PACIFIC SARDINE AND NORTHERN ANCHOVY AND IMPLICATIONS FOR SPECIES INTERACTIONS.
300 $a 261 p.
500 $a Source: Dissertation Abstracts International, Volume: 48-02, Section: B, page: 0321.
502 $a Thesis (Ph.D.)--University of California, San Diego, 1987.
520 $a Early life history parameters of Pacific sardine, Sardinops sagax, and northern anchovy, Engraulis mordax, were investigated to understand the processes of recruitment and the fluctuations in abundance of these pelagic fish stocks. Larval growth and mortality were compared in the context of life tables.
520 $a The formation of daily increments in the otoliths of Pacific sardine was confirmed in laboratory reared larvae. Sardine larvae grow faster than anchovy larvae at high temperatures (18.8(DEGREES)C) and at similar rates at low temperatures (12.5(DEGREES)C). Growth of juvenile anchovy were lowest during El Nino conditions. Back-calculated growth rates indicate that growth was similar to 'normal' years until a length of 45 mm, indicating that growth was not food limited during the larval period. Sardines grew faster than anchovies during El Nino, indicating that sardines may be superior competitors than anchovy when food is limiting.
520 $a Larval sardine mortality rates were higher than those of anchovy in the same region during 1951-67. Laboratory experiments indicated that sardine larvae were more vulnerable than anchovy to predation. This greater vulnerability of sardine larvae is associated with continuous swimming, whereas anchovy larvae swim using beat-and-glide locomotion. Sardines produce more eggs over their lifetime than anchovy and may be adapted to higher larval mortality.
520 $a The mortality rate of Pacific sardine larvae increased during 1951-67. Only northern anchovy biomass was significantly correlated with the increase in mortality rates indicating that predation of adult anchovy contributes significantly to the mortality of larval sardines and is a important interaction of the two species. Temperature, salinity, southerly transport, upwelling, water column stability, and Pacific mackerel, Scomber japonicus, biomass were not correlated with larval sardine mortality rates.
520 $a Sardine recruitment at age two was not correlated with larval mortality rates indicating that the strength of the year class is not determined early in the larval period of sardine. In a multiple correlation other environmental factors, only anchovy biomass was significantly correlated with the natural log of the ratio sardine recruits and sardine spawning biomass with a time lag of two years, indicating that predation by anchovy affects sardine recruitment.
590 $a School code: 0033.
650 4 $a Biology, Oceanography. $3 783691
690 $a 0416
710 2 $a University of California, San Diego. $3 1018093
773 0 $t Dissertation Abstracts International $g 48-02B.
790 $a 0033
791 $a Ph.D.
792 $a 1987
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8712279