Accumulation of 4-Nonylphenol (NP) in Short Estuarine Food Chains Potentially Leading to Endocrine Disruption in Chinook Salmon FryEPA Grant Number: U915638
Title: Accumulation of 4-Nonylphenol (NP) in Short Estuarine Food Chains Potentially Leading to Endocrine Disruption in Chinook Salmon Fry
Investigators: Hecht, Scott A.
Institution: Oregon State University
EPA Project Officer: Michaud, Jayne
Project Period: August 1, 1999 through August 1, 2002
Project Amount: $95,217
RFA: STAR Graduate Fellowships (1999) RFA Text | Recipients Lists
Research Category: Academic Fellowships , Fellowship - Life Sciences , Biology/Life Sciences
The objective of this research project is to investigate the potential for 4-nonylphenol (NP) to move up through estuarine food chains, resulting in endocrine disruption in salmon fry. The overall hypothesis of this research is that transmission of NP will take place through short grazer/consumer food chains in estuarine systems, and this will be sufficient to trigger endocrine disruption in chinook salmon fry.
Standard laboratory, sediment, toxicity bioassays were used to investigate bioaccumulation from sediments to amphipods and toxicity to amphipods. Three sets of experiments were conducted to determine these objectives. In the first set, two experiments were run in parallel, one with sediments spiked with 14C-NP and one with sediments spiked with 14C-PCB. Uptake of NP by amphipods was compared to PCB uptake across three treatments, consisting of sediments enriched with organic carbon of different nutritional qualities. In the second set, sensitivity of amphipods and phytoplankton to NP was investigated. The third set of experiments determined if induction of vitellogenin can occur from salmon fry feeding on amphipods that have bioaccumulated NP from contaminated sediments or algae.
Transmission of NP will take place through short grazer/consumer food chains in estuarine systems sufficient to trigger endocrine disruption in chinook salmon fry.