My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
7760
CWCB
>
UCREFRP
>
Public
>
7760
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 7:29:13 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7760
Author
Beyers, D. W., R. T. Muth and M. S. Farmer.
Title
Experimental Evidence of Competition Between Larvae of Colorado Squawfish and Fathead Minnow.
USFW Year
1994.
USFW - Doc Type
\
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
37
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
growth showed that competition did occur. This lack of corroboration by diet <br />analysis is confusing, but may suggest an alternative hypothesis. That is, <br />the intensity of competition was consistent in all feeding regimes, but the <br />quality of competition changed. Wilson and Tilman (1991) presented this <br />hypothesis to explain plant competition along a nitrogen gradient: a similar <br />mechanism may be governing competitive interactions in our experiment. Fierce <br />competition in the lowest feeding regime may have manifested normally <br />insignificant, functional feeding differences that were reflected by reduced <br />diet overlap. At higher feeding regimes, functional differences may have been <br />of less importance, but competition remained intense because of differential <br />growth efficiencies. Thus, relative growth could have integrated effects of <br />two qualitatively different competitive mechanisms without reflecting a change <br />because intensity of competition remained relatively constant. <br />Possible implications <br />Some attributes that facilitate competitive superiority of one species <br />over another include: feeding efficiency, functional morphology, efficiency <br />of conversion of resource to biomass (growth efficiency), and body size <br />(Schoener 1983; Werner 1992}. Although identification and description of <br />characteristics that provided a competitive advantage were not objectives of <br />this research, results of this experiment allow insight into possible <br />mechanisms. Feeding efficiencies and functional morphology of the fishes were <br />similar based on their consumption of the same food items and ability to <br />capture brine shrimp nauplii. At the beginning of the experiment, Colorado <br />squawfish had a size advantage but grew slower than fathead minnow suggesting <br />that the size differential did not provide a competitive advantage. Thus, <br />20 <br />
The URL can be used to link to this page
Your browser does not support the video tag.