EARLY DETECTION OF ALIEN SPECIES IN THE GREAT LAKES Alexander - - PowerPoint PPT Presentation

EARLY DETECTION OF ALIEN SPECIES IN THE GREAT LAKES

Alexander Karatayev, Wendy Paterson, and Lyubov Burlakova

Sampling Locations

Ontario Erie

Ashtabula Oswego Toledo Buffalo

Superior Huron Michigan

For our study we selected four Great Lakes ports from the 11 ports total identified as having the highest risk of invasion (US EPA Report 2008*), including:

• Buffalo and Oswego (sampled in 2014)
• Toledo and Ashtabula (2015, sampling in progress)

*US EPA. 2008. Predicting future introductions of nonindigenous species to the Great Lakes. National Center for Environmental Assessment, Washington, DC; EPA/600/R- 08/066F.

Methods (2014)

Samples were taken at 4 sites in the Buffalo and 3 in the Oswego Harbor following HELCOM 2013 Protocol*

• Benthos:
• 15 ponar grabs
• 6 benthic sleds
• Fouling community:
• 3 settlement plates (exposed for 3 months)
• 18 wall scrapings
• Mobile epifauna:
• 4 minnow traps for at least 24 hours,
• 4 light traps at night
• Zooplankton:
• 28 zooplankton tows in May and September (will be processed by

Cornell University)

• Environmental parameters: Secchi depth, sediment type, temperature,

conductivity, and DO

*HELCOM, 2013. Report of the HELCOM Aliens 3 Project Port Sampling

• Workshop. Helsinki Commission

Methods

• All organisms were picked live, fixed with 10% neutral buffered formalin, and

identified to the lowest possible taxonomic level (usually species, genus or family)

• Presence or absence of species was used to analyze different sampling

methods

Preliminary Results (30% of samples processed)

We found a total of 54 species and higher taxa of invertebrates, including 6 alien species:

– Echinogammarus ishnus – Cyclocalyx henslowanum – Schmidtea polychroa – Cordylophora caspia – Dreissena polymorpha – Dreissena rostriformis bugensis

We also found an alien fish species

(Neogobius melanostomus)

Colonial cnidarian Cordylophora caspia, was found in Oswego Harbor

No new alien species were found so far

Preliminary Results

• Total taxa found (excluding zooplankton):

– 54 (38 in Oswego and 43 in Buffalo)

• Total exotic taxa detected:

– 7 (7 in Oswego and 6 in Buffalo)

Results

• According to the species accumulation curves, the 23 samples taken in Oswego

Harbor may have been enough to obtain a realistic estimate of the diversity

• The SA curve for Buffalo, however, is not near an asymptote; more samples

were needed to access the number of taxa present.

Taxa detected by each sampling method*

(a - total number; b - averaged by sample number) The most efficient sampling methods were ponar grab and benthic sled

*Insects were excluded from the graphs as they are less likely to be potential invaders (Karatayev et al. 2009).

Exotic taxa (excluding insects) detected by each sampling method

• The highest number of exotic species was found in benthic sled
• Wall scrapings collected the second largest number of exotic species
• When averaged by sample number, the settlement plates collected more

exotics per unit effort

Results

• The most efficient sampling method was a ponar grab

(31 taxa found)

• The highest number of exotic species (6 taxa) was found

in benthic sled

• Wall scrapings collected the second largest number of

exotic species.

• When averaged by sample number, the settlement plates

collected more exotics per unit effort

• Live traps were not useful for freshwater benthos

• After the taxonomic identification will be

finished and confirmed, the data will be submitted into HELCOM’s database.

Acknowledgments

• This project was funded by the Great Lakes Long-term Biological

Monitoring Program, US EPA.

• We thank Josh Fisher, Brianne Tulumello, Susan Daniel, Knut Mehler, Katie

Hastings, Mark Clapsadl, Keith Pawlowski, Jacob Bajdas, Paul Williot, and Matt Bauer (Great Lakes Center), Diann Jackson, Andrew McElwain, Kamal Mohamed, Rachel Corin, Carrie Preston, and Brian Springal (SUNY Oswego), Curtis Karboski and Matt Paufve (USGS Oswego), and Lyndsie Collis, Joseph Cononoly, and Ellen George (Cornell University) for field and laboratory assistance.

• We also thank USFWS, HELCOM, and Patricia Schreiber from Buffalo

Crushed Stone for provided sampling equipment, methods and advice, and access to sampling location needed for the project.