Title

Variations in the Parasite Fauna and Gut Contents of Vertically Migrating and Non-Migrating Mesopelagic Fishes of the Northern Gulf of Mexico

Event Name/Location

147th Annual Meeting of the American Fisheries Society, Tampa, Florida, August 20-24, 2017

Document Type

Conference Proceeding

Publication Date

8-21-2017

Abstract

Mesopelagic (open ocean, 200-1000 m daytime depth) fishes are important consumers of zooplankton and are prey of oceanic predators. Two dominant mesopelagic fish families, Myctophidae and Sternoptychidae, occupy a similar daytime depth, but different nighttime depths. Myctophids undertake diel vertical migrations, while the sternoptychid genus Sternoptyx does not. The relationship between parasites and gut contents provides insights into ecological processes occurring within assemblages, as prey items are often vectors for parasites. This study examined the differences between the prey contents and parasite fauna of these two contrasting families in the Gulf of Mexico. Results showed that the non-migrating Sternoptyx fed upon a broader range of taxa than myctophids and appeared to transition from a zooplanktivorous to a micronektonivorous feeding style with increasing size. No feeding guild shift was observed in the vertically migrating myctophids, but their ration increased with body size. In both families, parasites were more abundant among higher size classes. The more diverse feeding predator, Sternoptyx sp., harbored a lesser diversity of parasites than the more selective feeding predator. These data can be used to develop and refine models aimed at understanding ecosystem structure and resilience to large-scale disturbances such as the Deepwater Horizon oil spill.

Comments

Also presented at:

  • Joint Meeting of the American Society of Ichthyologists and Herpetologists, Austin, Texas, July 12-16, 2017
  • Gulf of Mexico Oil Spill & Ecosystem Science Conference, New Orleans, Louisiana, February 6-9, 2017

ORCID ID

0000-0002-4900-3099, 0000-0002-5280-7071

This document is currently not available here.

Share

COinS