State of the Lake Huron Prey Fish Community in 1999: Progress toward Fish Community Objectives Jeff Schaeffer, Gary Curtis, Ray Argyle USGS Great Lakes.

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Presentation transcript:

State of the Lake Huron Prey Fish Community in 1999: Progress toward Fish Community Objectives Jeff Schaeffer, Gary Curtis, Ray Argyle USGS Great Lakes Science Center, Ann Arbor, MI. Great Lakes Science Center

Prey Objective “Maintain a diversity of prey species at population levels matched to primary production and to predator demands” DesJardine, R.L., T.K. Gorenflo, R.N. Payne, and J.D. Schrouder Fish-Community Objectives for Lake Huron. Great Lakes Fish. Comm. Spec. Pub Source:

Is the Prey Base Matched to Primary Production? No apparent changes in primary production Major changes in food web - zebra mussel proliferation - decline in deepwater benthic invertebrates Effects of food web changes Lake whitefish emaciation Improved growth of Saginaw Bay yellow perch

Hammond Bay Thunder Bay Ausable Point Harbor Beach Detour Lake Huron Fall Survey, m trawl Bloater Survey, m trawl Combined Survey, m trawl

Is the Prey Base Matched to Predatory Demand? What prey species are present? What species are eaten? Can we see effects of predation?

The Prey Community is Diverse: 32 species rainbow smelt (44%) alewife 28 % sculpins 10 % coregonids 6 % other species 12% Numerical Abundance

Alewife (29%) Other spp. (15%) Planktivore Biomass Dominated by Three Species Bloater (27%) R. Smelt (29%)

Prey Base dominated by two species! Major Chinook Prey items: alewife rainbow smelt sculpins, sticklebacks, other species Alewife (50 %) Smelt (24%) Other species (26%) Source: Interagency chinook diet data collated by MSU

Sculpins, Sticklebacks, Troutperch

Bloater Biomass is Cyclic

Rainbow Smelt Biomass

Alewife Biomass Average biomass

Alewife Biomass: 5 Year Intervals

Alewife abundance

Age-0 Alewife

Alewife:

Rainbow Smelt Biomass: 5 year intervals

Rainbow Smelt Abundance

Alewife as Prey Prey availability may depend on age-0 fish Year class strength –Good year: small prey –Poor year: few prey Growth may be important –Affects prey biomass –overwinter survival –Size-selective predation

Rainbow Smelt as Prey May no longer be a resource for large predators –Too rare –Very few large fish Scarcity may increase pressure on alewife

Conclusions Major changes in the food web Total planktivore biomass decreasing –Decline in bloater not due to predation –Declines in R. smelt and alewife consistent –with predation, but growth may be important Prey size structure declining –Few large alewife or rainbow smelt –Trends are consistent with predation

Prey Fish Objectives May be difficult to attain (numbers) –Food Web changes –Predator demand high –Pelagic planktivores declining Other 0bjectives may be enhanced –Greater proportion of native species in biomass –Reduced interactions with exotics –New approaches now possible