Find results with:

Add another field

Search by date

to

Searching collections:

Dartmouth Dissertations

Add or remove collections

Home Dartmouth Dissertations gentleman2000 1

Reference URL

To link to the entire object, paste this link in email, IM or document

To embed the entire object, paste this HTML in website

To link to this page, paste this link in email, IM or document

To embed this page, paste this HTML in website

Factors controlling the seasonal abundance and distribution of Calanus finmarchicus in the Gulf of Maine/Georges Bank Region.

you wish to report:

Your comment:

Your Name:

Submit

Cancel

...

Back to top

Powered by CONTENTdm®

Call No.	QL444.C72 G46 2000
Author	Gentleman, Wendy
Title	Factors controlling the seasonal abundance and distribution of Calanus finmarchicus in the Gulf of Maine/Georges Bank Region.
Date	2000
Abstract	Calanus finmarchicus, a kind of marine zooplankton, plays an important ecological role throughout the North Atlantic. Striking seasonal variations exist in its abundance and distribution in the Gulf of Maine/Georges Bank region. On the Bank in particular, it represents the dominant portion of the zooplankton in winter-spring and is virtually absent at all other times. During the time of its peak abundance, C. finmarchicus serves as a major food source for the endangered North Atlantic Right Whale and the larvae of the commercial fish, cod and haddock. Insight into what factors control the observed seasonal variations will improve our understanding of the animal's ecology and the processes affecting food availability for its predators. This work used physical-biological modeling to study how physical transport, behavior and population dynamics can interact to produce the observed seasonal changes in Calanus finmarchicus, on Georges Bank. Simulations indicate that physical transport of late-stage copepodites from the Gulf of Maine controls the occurence of adults on the Bank in winter-spring, providing a continual supply of C. finmarchicus to the Northeast Peak (NEP) fish spawning grounds. The abundance of female Calanus on the NEP is increased by the interaction of surface-seeking behaviour and seasonal circulation. Physical transport limits the supply of animals to the Bank Crest by geographical source region and season. Surface-seeking behavior increases the number transported there in winter, but cannot overcome the spatial/temporal constraints imposed by the physics. Changes in transport to and from the Crest do not account for the development of the "Calanus hole" in May-June; predation is the likely controlling factor. Physical transport, timing of seasonal migration and generation time are important controls for the spring aggregations of copepodites in the Right Whale feeding grounds; the Gulf, more than the Bank, is indicated as the source. Different life stages are controlled by different physical and biological factors. Food-limitation severely limits the recruitment of the first generation. Food effects are more important controls than are temperature or behavior, especially for the early-life stages that serve as food for larval fish.
Description	1 online resource (xvii, 272 leaves) : illustrations (some color), maps
Format	application/pdf
Advisor	Lotko, William
Subject	Calanus finmarchicus -- Georges Bank. ; Calanus finmarchicus -- Maine Gulf of. ; Calanus finmarchicus -- North Atlantic Ocean.
College	Thayer School of Engineering.
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D)--Dartmouth College.
Copyright	In Copyright. This material is protected by copyright and/or related rights. You are free to use this material in any way that is permitted by copyright law that applies to your use. For other uses, you need to obtain permission from the rights-holder(s). http://rightsstatements.org/page/InC/1.0/
DOI	https://doi.org/10.1349/ddlp.3098

Find results with:

Searching collections:

Home Dartmouth Dissertations gentleman2000 1

Factors controlling the seasonal abundance and distribution of Calanus finmarchicus in the Gulf of Maine/Georges Bank Region.

Object Description

Description

Factors controlling the seasonal abundance and...

Factors controlling the seasonal abundance and...

	All
	Pages Enter page numbers or page ranges separated by commas. For example: 1,3,5-12