Environmental drivers of forage dynamics in Chesapeake Bay
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1 Environmental drivers of forage dynamics in Chesapeake Bay Ryan Woodland 1, Edward Houde 1, Carlos Lozano 1, Andre Buchheister 2, Robert Latour 3, Christopher Sweetman 3, Mary Fabrizio 3, Troy Tuckey 3 1 Univ. Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, MD Humboldt State University, Arcata, CA Viginia Institute of Marine Science, Gloucester Point, VA 2362
2 Acknowledgements Bruce Vogt Kara Skipper Emilie Franke Tom Ihde Jeremy Testa Mike Lane Thomas Miller Roberto Llanso Eric Durrell Joe Molina Tom Parham Mike Mallonee
3 Role of forage in ecosystem-based fisheries management Critical consideration of EBFM (Bigford 214) Link lower to upper trophic levels Predator consumption & production linked to forage availability Key forage identified for CBay predators (Ihde et al. 215)
4 Role of forage in ecosystem-based fisheries management Bay Anchovy Polychaetes Mysids Razor clams Amphipods and isopods Weakfish (juveniles) Spot (juveniles) Mantis shrimp Sand shrimp Atlantic croaker (juveniles) Macoma clams Based on wet weight of prey in stomach analyses from ChesMMAP (VIMS) Atlantic menhaden Blue crab Shad & river herrings Small bivalves Atl. silverside Mummichog Managed forage species Historically important Upriver
5 Role of forage in ecosystem-based fisheries management Critical consideration of EBFM (Bigford 214) Link lower to upper trophic levels Predator consumption & production linked to forage availability Key forage identified for CBay predators (Ihde et al. 215) Strong interannual patterns in forage abundance indices and predator consumption patterns (Buchheister et al. 216)
6 Role of forage in ecosystem-based fisheries management Menhaden, YOY Spot, YOY Silverside Alewife, YOY Anchovy Weakfish, YOY Croaker, YOY Blueback, YOY
7 Role of forage in ecosystem-based fisheries management Menhaden, YOY Spot, YOY Silverside Alewife, YOY Anchovy Weakfish, YOY Croaker, YOY Blueback, YOY
8 Role of forage in ecosystem-based fisheries management What determines local and regional abundance of key forage? How does local forage availability influence predator diet?
9 Role of forage in ecosystem-based fisheries management Current Project Objective 1 Identify environmental gradients associated with spatial and temporal patterns in relative abundance of forage taxa in Chesapeake Bay Objective 2 Explain how spatial and temporal gradients in environmental variables influence consumption of forage taxa, and quantify the effect of forage abundance on consumer populations
10 Methods Forage indices Environmental data Fish Small pelagics Forage groups YOY age-classes Data type Source Area Forage indices ChesFIMS/TIES historical survey Mainstem MDDNR/VIMS seine surveys Tributaries CBP/Versar Benthic survey Main/Trib Env. conditions CBP Water Quality survey Main/Trib USGS flow gauges Tributaries Modeled hypoxic basin volumes Main/Trib Buoy & Pier temperature datasets Baywide NOAA climate indices (AMO) Baywide Invertebrates Invertebrates Macoma Spp. Other bivalves Polychaetes Amphipods/Isopods
11 Methods Forage indices Environmental data Predator indices and stomach contents data Area-swept estimates of abundance Size-class, (non-)index period, Year Data type Source Area Abundance ChesMMAP survey Mainstem/Regions Diet/Consumption ChesMMAP survey Mainstem/Regions Env. conditions CBP Water Quality survey Baywide ChesMMAP survey Mainstem/Regions
12 Methods Spatial & Temporal domain Forage Benthic invertebrates: 1995/ (Mainstem/Tribs) Forage fish: (Mainstem) Forage fish: , (VA Tribs) (MD Tribs) Predators All species/size-classes: Gear Grab MW Seine Seine BT
13 Forage indices (Fish/Invertebrates) Project Objective Indices Large-scale Time-series Modeling approach Delta-GLM GLM DFA Probability Delta-generalized linear models Response variables Biomass per square meter; catch per unit effort Logistic component (Presence/absence) Relative abundance = GLM/GLMM (Presence only) Relative abundance Annual index
14 Mainstem James Patuxent Potomac Rappahannock York Chesapeake Bay James River Patuxent River Potomac River Rappahannock Riv York River Macoma.6.4 Estimate Macoma amphipods_isopods Amphipod/Isopod other_bivalves Other bivalves polychaete Estimate 1 Estimate 1 Estimate Annual indices: benthic invertebrates Polychaetes
15 Alewife Bay anchovy Blueback herring YOY Croaker YOY Menhaden Atl. silversides YOY Spot YOY Weakfish Upper mainstem Middle mainstem Lower mainstem y p ESTIMATE_2 ESTIMATE_2 ESTIMATE_ Annual indices: Forage fish (MAINSTEM ONLY)
16 Forage indices of abundance (Forage fish) Annual indices: Forage fishes YOY Menhaden Alewife Silverside Anchovy Pelagic species YOY Weakfish Croaker Spot Demersal species
17 Ongoing analysis: Spatial portfolio effect Use of multiple areas likely has benefits for forage and predators reduces risk to forage (different conditions), reduces spatially variability of food for predators (less patchy) Assess importance of maintaining a portfolio of suitable habitats in Chesapeake Bay for forage Amphipods /Isopods Rappahannock Riv York River James River Patuxent River r s =.63 r s = -.3 Identify the reduction in total forage variability arising from spatial covariance
18 Ongoing analysis: Spatial portfolio effect Coefficient of variation Portfolio effect (Var. dampening) Alewife Bay anchovy Blueback herring YOY Croaker YOY Menhaden Atl. silversides YOY Spot YOY Weakfish Amphipod/Isopod Macoma spp. Other bivalves Polychaetes CV C CV M PE Kerr et al. 29
19 Forage-environment analysis Project Objective Indices Large-scale Time-series Modeling approach Delta-GLM GLM DFA Forage-environment: generalized linear model Response variable Annual indices of relative abundance Distribution Gamma w/log link Explanatory variables (all continuous) Atlantic Multidecadal Oscillation Spring river discharge (ft 3 /sec; USGS) DOY 5 5 C degree days (Buoy/VIMS/CBL pier dataset) Spring chlorophyll concentration (Feb-May; CBP WQ survey) January-June hypoxic volume (UMCES/UMichigan)
20 Forage-environment analysis Inverts Forage fish Forage group AMO Chla DD Flow Hypoxia Pseudo-r 2 Amphipods/Isopods Macoma spp..31 Other bivalves +.51 Polychaetes.44 Alewife Bay anchovy +.57 Croaker +.72 Menhaden.39 Atl. silverside.32 Spot +.55 Weakfish +.52 Moderate-low flow and warmer springs (fish) positively related Hypoxic volume positively related to forage abundance*
21 Forage-environment analysis Forage Tributary AMO Chla Patuxent Potomac + Rappahannock Patuxent Potomac James Patuxent + Potomac York + James Patuxent Potomac Rappahannock + DD Flow Hypoxia Pseudo-r Highly variable, even within taxa (strong tributary-level effects) Cooler springs positively related to forage fish
22 Forage analysis: discussion Portfolio Effect Multiple suitable benthic habitats a strategy for stable benthic forage Forage-Environment models Evidence of climate-forcing but not (AMO, spring flow) growing literature on AMO effects (Wood and Austin 29, Nye et al. 214, Buchheister et al. 216) High spring flows correlated with low forage abundance in mainstem Differential influence of rapid vernal warming vertebrates(+) vs inverts(-) increased prevalence of earlier warming possible under future climate change Hypoxic volume positive effect linked to change in catchability or spatial recruitment pattern?
23 Nearing completion (this summer) Forage fish in tributaries Forage-Environment modeling and Portfolio Effect Dynamic factor analysis (DFA) Shared trends across regions relative to key environmental gradients Integration of forage and predator consumption results Correlation between forage abundance and consumption Consumption relative to environmental gradients Spatial aspect of consumption - difficult
24 EXAMPLES: Spatial differences in diet (within mainstem) Mean proportional stomach contents Some similarities/ differences apparent but statistical power? r=.98 r=.86 r=.81 Large Medium Small MD VA Large r=.84 Medium r=.76 Small r=.84 Highly variable Anchovies Atl. Menhaden Atl. Croaker Spot Weakfish Bivalves Mysids Other Crustaceans Polychaetes Other prey Anchovies Atl. Menhaden Atl. Croaker Spot Weakfish Bivalves Mysids Other Crustaceans Polychaetes Other prey
25 Thank you!
26 Methods: Predator consumption estimates Annual consumption by predator (C) Per capita, daily consumption (c) Predator abundance (N) = x x ΣSize Σtime Time period (t) x Diet proportion (D) Evacuation rate model Data inputs: - Avg. stom. contents - Water temp. Area-swept estimates No efficiency, selectivity Conservative estimates Predator-specific size classes S: <3 cm M: 3-5 cm L: >5 cm 6-month seasons Index (higher abund.) Non-Index Gut contents Approach accounts for: - Predator size - Diet shifts - Seasons (e.g., migration) - Temperature E.g., Link and Sosebee 28, Overholtz and Link 27
27 Forage fish Benthic forage Predators VIMS seine TIES/ChesFIMS MDDNR seine
28 Abundance Indices Minimum Trawlable Number (Millions)
29 Ongoing analysis: Spatial portfolio effect Coefficient of variation Alewife Bay anchovy Blueback herring YOY Croaker YOY Menhaden Atl. silversides YOY Spot YOY Weakfish Amphipod/Isopod Macoma spp. Other bivalves Polychaetes CV C CV M PE Portfolio effect (Vari dampening) Biomass-weighted coefficient of variation (CV M *) assuming regional abundance is perfectly correlated Observed CV across regions (CV M ) PE extent of variance dampening Kerr et al. 29
30 Ord_Day_at_5_5DD Ordinate DoY at which cumulative 5 C DD >
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