Abstract/Details

Marine habitat dynamics: A case study of habitat suitability for a temperate flatfish (winter flounder, <i>Pseudopleuronectes americanus</i>, Walbaum) on an estuarine nursery ground


2005 2005

Other formats: Order a copy

Abstract (summary)

Estuaries throughout the world serve nurseries for many fish and invertebrates. Biotic and abiotic factors affecting critical early life history processes are extremely variable in space and time in temperate estuaries where nursery habitat suitability is likely be spatially dynamic. A series of mensurative experiments was performed throughout a New Jersey USA estuary to describe the effects of habitat dynamics on larval settlement, early juvenile growth, and juvenile predation risk for a model flatfish; winter flounder, Pseudopleuronectes americanus. All three early life history processes were spatially dynamic because of the effects of physico-chemical gradients variable at coarse spatial (≈10 km) but fine temporal scales (days-weeks), and factors nested within coarse scale spatial gradients that varied at fine spatial (≤1 km) but fine to coarse temporal scales (days-decades). Specifically, larvae settled earlier on depositional substrata located upstream in the estuary where waters warmed more rapidly than downstream areas during the spring. Early juvenile growth was also most rapid at upstream sites where prey were abundant and optimal temperatures and salinities coincided in space for a limited period following settlement. Sizes of juveniles were consistently larger upstream than downstream as a result of the dynamics of habitat suitability for settlement and growth. Comparison of settlement and juvenile distributions indicated that post-settlement processes modified settlement more slowly in upstream areas. Predation studies demonstrated that predation risk was, indeed, low in shallow structurally complex habitats with salinities lower than those preferred by dominant fish predators and typical of upstream habitats. Thus, during most years, habitat effects on settlement, growth and predation risk produced a high quality nursery upstream in the estuary. This finding was consistent with upstream juvenile distributions measured in estuaries throughout the species range. However, abnormally warm and dry conditions in the spring appeared to cause the volume of the upstream predation refuge to contract and high mortality in the primary nursery. This result suggests that climatic forcing which controls the structure of physico-chemical gradients and the location and volume of habitats optimal for survivorship and other critical processes probably regulates local year class strength in estuaries.

Indexing (details)


Subject
Ecology;
Oceanography
Classification
0329: Ecology
0416: Oceanography
Identifier / keyword
Biological sciences; Estuarine; Flounder; Marine; Nursery; Pseudopleuronectes americanus
Title
Marine habitat dynamics: A case study of habitat suitability for a temperate flatfish (winter flounder, <i>Pseudopleuronectes americanus</i>, Walbaum) on an estuarine nursery ground
Author
Manderson, John Pilling
Number of pages
217
Publication year
2005
Degree date
2005
School code
0118
Source
DAI-B 66/06, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0542197928, 9780542197925
Advisor
Juanes, Francis
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3179898
ProQuest document ID
304993659
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304993659
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.