thumbnail

Relationship between body condition of American alligators and water depth in the Everglades, Florida

Hydrobiologia

By:
, , ,
DOI: 10.1007/s10750-009-9925-3

Links

Abstract

Feeding opportunities of American alligators (Alligator mississippiensis) in freshwater wetlands in south Florida are closely linked to hydrologic conditions. In the Everglades, seasonally and annually fluctuating surface water levels affect populations of aquatic organisms that alligators consume. Since prey becomes more concentrated when water depth decreases, we hypothesized an inverse relationship between body condition and water depth in the Everglades. On average, condition of adult alligators in the dry season was significantly higher than in the wet season, but this was not the case for juveniles/subadults. The correlation between body condition and measured water depth at capture locations was weak; however, there was a significant negative correlation between the condition and predicted water depth prior to capture for all animals except for spring juveniles/subadults which had a weak positive condition-water depth relationship. Overall, a relatively strong inverse correlation occurred at 10-49 days prior to the capture day, suggesting that current body condition of alligators may depend on feeding opportunities during that period. Fitted regression of body condition on water depth (mean depth of 10 days when condition-water depth correlation was greatest) resulted in a significantly negative slope, except for spring adult females and spring juveniles/subadults for which slopes were not significantly different from zero. Our results imply that water management practices may be critical for alligators in the Everglades since water depth can affect animal condition in a relatively short period of time.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Relationship between body condition of American alligators and water depth in the Everglades, Florida
Series title:
Hydrobiologia
DOI:
10.1007/s10750-009-9925-3
Volume
635
Issue:
1
Year Published:
2009
Language:
English
Publisher:
Springer
Publisher location:
Amsterdam, Netherlands
Contributing office(s):
Southeast Ecological Science Center
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Hydrobiologia
First page:
329
Last page:
338
Number of Pages:
10
Additional Online Files(Y/N):
N