Graduate Thesis Or Dissertation
 

Reproduction and growth of the Pacific basket-cockle, Clinocardium nuttallii Conrad, from intertidal and subtidal environments of Netarts Bay

公开 Deposited

可下载的内容

下载PDF文件
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ng451m556

Descriptions

Attribute NameValues
Creator
Abstract
  • Age structure and growth of shells of the Pacific basket-cockle, Clinocardium nuttallii in Netarts Bay, Oregon, were investigated with special emphasis on the differences between subtidal and intertidal populations. The cockle was chosen for study because its growth is highly sensitive to physical factors in the environment. Evidence is presented which suggests that stresses of the physical environment and biological factors result in oldest individuals being in the subtidal, and that growth of shells is correlated with the amount of tidal submergence. A short-term tagging study was done at two sites and most of yearly growth occurred in the Spring months. Collections were made from July, 1975, through September, 1976, from six sites to study synchronism of gonadal development and fecundity of populations by histological examination of gonads. Synchronism of gonadal development to the ripe stage occurs among intertidal and subtidal populations in the same area, while populations from different areas of the bay do not reach the ripe condition at the same time. There is evidence of protandric spawning behavior, and the hermaphroditic nature of C. nuttallii is compared to that of the Family Tridacnidae. The fecundity of the subtidal populations, in terms of percentages of the populations producing ripe gonads, was greater than fecundity of the intertidal populations. The subtidal environment is suggested to serve as 'refugia' for adult breeding populations.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
权利声明
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

关联

Parents:

This work has no parents.

属于 Collection:

单件

缩略图 标题 上传日期 公开度 行动
file details RattiFrankDouglas1978.pdf 2017-08-15 公开 下载