446 Aquatic Ecology Flashcards Preview

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Flashcards in 446 Aquatic Ecology Deck (279)
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181

smolt weight

is significantly decreased with increasing density, there is a limit to how many fish a system can produce (carrying capacity)

182

salmon and nutrient-foodweb dynamics

more nutrients-- larger algae-- small/inefficient grazers-- low growth, small smolts, low adult return

183

fertilization of lake, 1983

TP increases, algal biomass increases, daphnia size and biomass increase

184

impact of lake fertilization on smolt size

1yr old smolts small increase in size
2yr old smolts large increase in size

185

impact of lake fertilization on fry/smolt density

both increasing

186

fry stocking of lake, 1987

TP, algal biomass drop off, daphnia size and biomass drop, average smelt size drops off, fry and smelt density increase for a few years then drop off, change in zooplankton composition
over capacity

187

smolt size vs. daphnia size

positively correlated
(larger, efficient grazers = larger fish)

188

important factors in the highly variable growth pattern of sockeye smolts

fry density
size of zooplankton
lake features

189

size of 1yr old smolts and total zooplankton biomass

available food is not a good predictor of smolt size

190

size of 1yr old smolts and mean size of Daphnia

quality of food is a better predictor of smelt growth and size

191

smolt size and nutrient levels

smolt size and fry density higher in high nutrient system, but not increasingly so, systems 'level off' in all nutrient levels

192

photic depth vs. turbidity, and colour

photic depth rapidly drops off in both, but quicker with increased turbidity

193

light penetration, clear lake

euphoric depth 16.4m
secchi depth 7.2m

194

light penetration, stained lake

euphotic depth 7.4m
secchi depth 4.3m

195

light penetration, glacial lake

euphotic depth 6.5
secchi depth 1.5m

196

thermal traits, clear lake

max T 14º
mean T 7.8º
heat budget 11.8 kcal/cm^2

197

thermal traits, stained lake

max T 16.2º
mean T 6.9º
heat budget 10.8 kcal/cm^2

198

thermal traits, glacial lake

max T 11º
mean T 5.9º
heat budget 11.6 kcal/cm^2

199

vertical mixing patterns in different lakes

depth as a function of T
heat budget is area 'under the curve'

200

depth vs. T, clear lake

med T at surface, drop off, med T at depth

201

depth vs. T, stained lake

highest T as surface, rapid drop off, lowest T at depth

202

depth vs. T, glacial lake

coldest at surface, T remains ~constant at every depth, winds up being highest T at depth b/c other 2 drop off to lower T

203

Primary production in different lake types

Chl vs. TP
positively correlated, high slope in clear lake
positively correlated, med slope in stained lake
no real relationship in glacial lake

204

glacial lakes

lowest light penetration
lowest T's (med. heat budget)
constant T with depth
higher TP
lower Chl then clear
produces smallest fish and lowest smolt biomass

205

1yr old smolt weight vs. age and different lake types

age vs. weight tightly positively correlated
clear lakes - fish at whole spectrum of the best fit line
stained - ~half way up line
glacial lake- only the lowest part of the line

206

smolt length in lake types

clear 95mm
stained 71mm
glacial 69mm

207

smolt weight in lake types

clear 7.9g
stained 3.3g
glacial 2.6g

208

smolt biomass vs. euphotic depth

clear - positively correlated
stained, glacial - only points at small euphotic depths, euphotic depths can't be very deep in these lakes

209

smolt biomass vs. zooplankton biomass

clear - positively correlated
stained- positively correlated but only goes ~half way up line
glacial - only points at small smolt/zoop biomasses

210

SST shift study, Eastern Bering Sea

2002-2005 warm, 2006-2007 cold
use N isotopes in zooplankton to study shifts in foodwebs