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Comparative study of the population ...

Gomez Gutierrez, Jaime.

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Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region./
Author:	Gomez Gutierrez, Jaime.
Description:	245 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0596.
Contained By:	Dissertation Abstracts International65-02B.
Subject:	Biology, Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3120756
ISBN:	0496681117

Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region.
Gomez Gutierrez, Jaime.

Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region. - 245 p.

Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0596.

Thesis (Ph.D.)--Oregon State University, 2004.

I compare the seasonal abundance variation, population dynamics, fecundity, egg hatching mechanism and success, and apostome ciliate parasites of the euphausiids Euphausia pacifica and Thysanoessa spinifera from the Oregon coast, USA. Community structure and nearshore distributions were examined from bi-weekly oceanographic surveys (1970--1972). This region has a strong cross-shelf change in euphausiid assemblages located about 45 km from shore. Euphausia pacifica and T. spinifera have life stage-segregated distributions, suggesting active location-maintenance strategies.

ISBN: 0496681117Subjects--Topical Terms:

783691
Biology, Oceanography.

Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region.
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035 $a AAI3120756
040 $a UnM $c UnM
100 1 $a Gomez Gutierrez, Jaime. $3 1933780
245 1 0 $a Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region.
300 $a 245 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0596.
500 $a Advisers: Charles B. Miller; William T. Peterson.
502 $a Thesis (Ph.D.)--Oregon State University, 2004.
520 $a I compare the seasonal abundance variation, population dynamics, fecundity, egg hatching mechanism and success, and apostome ciliate parasites of the euphausiids Euphausia pacifica and Thysanoessa spinifera from the Oregon coast, USA. Community structure and nearshore distributions were examined from bi-weekly oceanographic surveys (1970--1972). This region has a strong cross-shelf change in euphausiid assemblages located about 45 km from shore. Euphausia pacifica and T. spinifera have life stage-segregated distributions, suggesting active location-maintenance strategies.
520 $a Morphology and biometry of all the post-spawning embryonic stages and the hatching mechanisms of three broadcast-spawning (E. pacifica, T. spinifera and Thysanoessa inspinata) and one sac-spawning (Nematoscelis difficilis) euphausiids are described. The average embryo and chorion diameters were significantly larger for E. pacifica (0.378, 0.407 mm) than for T. spinifera (0.353, 0.363 mm) and T. inspinata (0.312, 0.333 mm). There are four hatching mechanisms. Some broadcast-spawning species have delayed hatching schedules, hatching as nauplius 2, metanauplius or calyptopis 1, rather than as the usual nauplius 1. Sac-spawning species sometimes hatch early as nauplius 2, rather than as the normal pseudometanauplius or metanauplius. Late and early hatching schedules were associated with low hatching success and small brood size.
520 $a The brood sizes (BS) of E. pacifica and T. spinifera were estimated during incubations on 23 cruises. Thysanoessa spinifera had higher BS and extended its spawning areas farther offshore during 2002 than in 1999--2001. Euphausia pacifica had a stable inshore-offshore brood-size pattern from 2001 to 2003, and had greater BS than during 1999--2000. Elevated egg production during summer 2002 was associated with cooler, high chl-a conditions resulting from anomalously high equatorward transport.
520 $a The interbrood period (IBP) was estimated for E. pacifica by (1) observation of the clutch-to-clutch interval for females maintained in the laboratory, and (2) as the inverse of the proportion of females in the field stock with a purple thoracic band. The methods produced similar frequency distributions of IBP estimates. In their first spawning season (<19 mm TL) females produce on the order of 16 eggs fem-1 d-1. Larger females in their second spawning season (19--30 mm TL) produce about 24 eggs fem-1 d-1.
520 $a I describe a parasitoid apostome ciliate (Collinia oregonensis sp. nov) that infects E. pacifica, T. spinifera and Thysanoessa gregaria. A mass mortality of E. pacifica caused by this parasitoid in Astoria Canyon, Oregon challenges the widely held notion that mortality in pelagic organisms is primarily by predation and starvation.
590 $a School code: 0172.
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Biology, Ecology. $3 1017726
690 $a 0416
690 $a 0329
710 2 0 $a Oregon State University. $3 625720
773 0 $t Dissertation Abstracts International $g 65-02B.
790 1 0 $a Miller, Charles B., $e advisor
790 1 0 $a Peterson, William T., $e advisor
790 $a 0172
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3120756