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Home range and space use patterns of flathead catfish during the summer-fall period in two Missouri streams

Transactions of the American Fisheries Society

By:
and
DOI: 10.1577/T04-064.1

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Abstract

Flathead catfish Pylodictis olivaris were radio-tracked in the Grand River and Cuivre River, Missouri, from late July until they moved to overwintering habitats in late October. Fish moved within a definable area, and although occasional long-distance movements occurred, the fish typically returned to the previously occupied area. Seasonal home range was calculated with the use of kernel density estimation, which can be interpreted as a probabilistic utilization distribution that documents the internal structure of the estimate by delineating portions of the range that was used a specified percentage of the time. A traditional linear range also was reported. Most flathead catfish (89%) had one 50% kernel-estimated core area, whereas 11% of the fish split their time between two core areas. Core areas were typically in the middle of the 90% kernel-estimated home range (58%), although several had core areas in upstream (26%) and downstream (16%) portions of the home range. Home-range size did not differ based on river, sex, or size and was highly variable among individuals. The median 95% kernel estimate was 1,085 m (range, 70– 69,090 m) for all fish. The median 50% kernel-estimated core area was 135 m (10–2,260 m). The median linear range was 3,510 m (150–50,400 m). Fish pairs with core areas in the same and neighboring pools had static joint space use values of up to 49% (area of intersection index), indicating substantial overlap and use of the same area. However, all fish pairs had low dynamic joint space use values (<0.07; coefficient of association), indicating that fish pairs were temporally segregated, rarely occurring in the same location at the same time.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Home range and space use patterns of flathead catfish during the summer-fall period in two Missouri streams
Series title:
Transactions of the American Fisheries Society
DOI:
10.1577/T04-064.1
Volume:
134
Issue:
2
Year Published:
2005
Language:
English
Publisher:
American Fisheries Society
Description:
9 p.
First page:
509
Last page:
517
Country:
United States
State:
Missouri
Other Geospatial:
Cuivre River, Grand River
Online Only (Y/N):
N
Additional Online Files (Y/N):
N