Skip to main content

Factors affecting resource use variation for an abundant coastal fish predator, Lutjanus apodus, in a bahamian wetland system

Buy Article:

$25.00 plus tax (Refund Policy)

Abstract:

Studies of fishes' resource use reflect important ecological interactions, and provide insight into the structure of aquatic food webs. Individuals within species are often assumed to have an equivalent ecological role despite increasing evidence that among-individual variation in resource use within populations is common. Such intraspecific variation in resource use can be a result of ontogenetic-based diet shifts, differences in individual feeding behavior within age groups (i.e., individual specialization), and temporal variation in resource pools. We examined trophic interactions in schoolmaster, Lutjanus apodus (Walbaum, 1972), over multiple seasons and across size classes in a Bahamian wetland system. Using combined stable isotope and stomach content analyses, we found that, as with many other fishes, subadults fed at higher trophic levels than juveniles, likely because of a shift from feeding predominantly on lower trophic-level prey taxa (e.g., crabs) to higher trophic-level prey taxa (e.g., teleosts). Despite a considerable overlap in stable isotope values between subadults and juveniles, stable isotope and stomach content data suggest a switch from feeding predominantly within mangrove prop roots as juveniles to foraging increasingly in adjacent seagrass beds as subadults. Niche width and degree of individual dietary specialization varied among years, suggesting important levels of temporal variation. In sum, individual snapper do not use resources homogeneously, and we outline some of the factors, including predation risk, increase piscivory, and temporal differences in resource use, that underlie this variation.

Document Type: Research Article

DOI: http://dx.doi.org/10.5343/bms.2011.1024

Publication date: April 1, 2012

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
umrsmas/bullmar/2012/00000088/00000002/art00003
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more