Water Ecology Test

What are the main parts of the “ice year”?

Freeze up, Main Winter, and Ice Break-Up

What are the main types of river ice?

Frazil ice and Anchor Ice (Dynamic) & Border Ice and Sorface Ice (Static)

What are the main physical effects of river ice on habitat conditions?

Velocity decrease makes middle faster (Ice friction), habitat alteration Light reduction, Dissolved oxygen dynamics, sediment transport and scour.

What ecological effects does river ice have?

Invertebrates: some bugs have cold hardiness and purposely freeze to avoid predators, species specific responses, increased drift during dynamic ice events

Fish: (EGG INCUBATION ice scour and freezing can damage eggs, anchor ice over eggs can reduce oxygen for eggs and they have to get it from ground instead)  & (DISTRIBUTION small fish hide in substrates, large fish go to deeper pools, some use ice for cover) (VEGETATION ice scouring and sediment movement change aquatic and riparian plant communities)

What is the concept of stream orders and zonation?

Stream Orders: A hierarchical classification of streams (1st order = headwater streams, Higher orders = formed when lowers order streams merge) as order increases, channel size, discharge, and sediment load increase and gradient generally decreases.

Zonation: Different zones in a drainage basin (Erosion, Transportation, Deposition)

Name some important Canadian rivers, and where does their water flow?

1. Mackenzie River - Arctic Ocean 

2. St. Lawrence River - Atlantic Ocean

3. Fraser River - Pacific Ocean 

What is the water cycle, and what parts does it have?

the continuous movement of water between the atmosphere, land, and oceans.

1. Evaporation and Transpiration - water from land water into atmosphere

2. Condensation - water vapor forms clouds

3. Precipitation - rain or snow returns to surface

4. Infiltration and Percolation - water into the ground

5. Runoff - water flows into rivers and lakes, completing the cycle 

What is a river, catchment vs. watershed, and basin?

River - naturally flowing body of water with a current from source to mouth through a gradient

Catchment: The land area where all precipitation drains to a common outlet.

Watershed: Often used interchangeably with catchment; the boundary dividing different catchments.

Basin: A larger-scale area encompassing one or more watersheds that drain into a common outlet (e.g., Hudson Bay Basin). Open area where water collects 

What are the 3 dimensions of a river channel?

Lateral – River’s connection with its floodplain and banks

Longitudinal – Flow direction from headwaters to mouth.

Vertical (hyporheic) – Interaction between surface water and groundwater.

Understand the concept of habitat and different scales of habitat

Habitat - The place where a species lives, defined by physical and biological characteristics

Macrohabitat – Large-scale, e.g., entire catchment

Mesohabitat – Visually distinct features like pools, riffles, runs; link species to habitat type.

Microhabitat – Small-scale site measurements (e.g., juvenile fish habitat preferences).

What is a hydrograph and what factors affect it?

Hydrograph - A graph showing river discharge (flow) over time (instantaneous, annual, or multi-year).

Factors 

• Local climate and season (snowmelt, rainfall).

• Catchment topography and geology.

• Land use (urbanization, deforestation).

• Lakes or wetlands (flow storage or delay).

• Human impacts (water withdrawal, dams, regulation).

What is hydropeaking?

Hydropeaking refers to rapid, artificial fluctuations in river discharge caused by hydropower generation, where turbines are turned on/off to meet electricity demand. changing it can mess with the species used to a specific discharge for that time of year

What is the concept of environmental flows?

Environmental flows - “How much water does a river need” describe the quantity, timing, and quality of water flows required to sustain ecosystems and human needs that depend on them. (Summer is the zone of highest risk)

What is substrate, benthos, and biofilm/periphyton?

Be able to explain the difference between the three

Substrate - Underlying layer of organic material, minerals/stone that is on the bottom of a water body.

Benthos - community of organisms that live on or near the bottom of a body of water

Biofilm/Periphyton - community of fungi, bacteria, and algae that reside in a polysaccharide matrix on substrate and act as a food source to many organisms

What are benthic macroinvertebrates (BMIs)?

Be able to name common BMI groups in freshwater

small, aquatic animals and the aquatic larval stages of insects.

Some common groups - sponges, molluscs, worms, shrimp, and insects

What are EPTs?

For these, you must be able to name the scientific name of each Order (E, P, T), and the common name of their order

Ephemeroptera - Mayflies

Plecoptera - Stoneflies

Trichoptera - Caddisflies

What common adaptations do BMI have to life in moving water

flattening/streamlining of the body

hooks and grapples

filtering structures

Which of the EPT is this?

Ephemeroptera - Mayflies

which of the EPT is this?

Plecoptera - Stoneflies

Which of the EPT is this?

Trichoptera - Caddisflies 

What habitats might you find BMI?

swift currents

hyporheic zones

slow moving habitat

water surfaces

What is drift, different categories, and what causes drifting?

Drift is the downstream transport of organisms in the water column via active or passive entry.

Categories

1. Constant drift: Accidental dislodgement of organisms

2. Catastrophic drift: Caused by environmental disturbances such as floods, droughts, or pollutants.

3. Behavioural drift: Intentional movement of animals into the water column

Causes

1. proximal triggers like light (movement at night)

2. reduced food availability

3. high density could promote drift (excess production upstream)

Why are BMI’s important?

1. Indicators of stream/river processes (functional feeding processes)

2. Indicators of water quality (pollution tolerance, integrate short and long term conditions, relative sedentary)

3. Important food source for fish

4. Tracer of historic conditions (they have narrow temperature regimes, so their presence in the sediment can tell you something)

What are functional feeding groups?

Classification of how the BMI feeds (doesn’t mean they are the same type of BMI among said feeding groups)

1. shredders - feed on course organic matter (leaves) (ex. stonefly)

2. collectors - Feed on fine organic matter through filtration or gathering (ex. blackfies)

3. scrapers - Feed of the periphyton (algae) (ex. caddisfly)

4. predators - carnivores that feed on other invertebrates (ex. dragonflies)

What and how can BMI’s tell about the environment?

1. Water quality - BMI have different tolerances for water quality, so presence of a certain type could either be a good or bad indicators (you want lots of EPT’s)

2. Stream/River processes - particularly through feeding types can show nutrient cycling and energy flow in streams

3. Long term and Short term changes - you can infer environmental conditions  due to the BMI’s relative sedentary nature. 

What is CABIN, and why is that approach useful?

CABIN (Canadian Aquatic Biomonitoring Network) is a national standard program for assessing aquatic ecosystem health. It uses BMI samples and uses the Reference Condition Approach (RCA) to determine whether a site is “normal” or “impaired.” (EVERYTHING IS COLLECTED THE SAME)

Useful because… 

1. lots of sites

2. consistent methods

3. cost efficient

4. normal vs. impaired assessment

What is a fish?

All are craniates

Most…

• live in water

• have paired fins

• are vertebrates

• ectotherms

• have gills and jaws

Why study fish?

1. Indicator of environment 

2. Human nutrition 

3. Economy

4. Medical research

5. Tox tests (ex. LD 50)

6. General importance in ecosystems

Understand diversity of fish and their habitats and basic life history strategies in fish

~35,000 species of fish, if there is water and oxygen, fish will likely be there (11km below sea level or kms above sea level in mountains etc)

Life history strategies : 

• fast vs. slow water strategies

• schooling vs. hierarchical vs. solitary 

• diurnal vs. nocturnal

• migratory vs. resident

• site fidelity

Describe what is diadromy (anadromy / catadromy) and give examples of species on both categories, including their life-history stages? (ON TEST FOR SURE)

Diadromy is when a fish spends part of its life in saltwater and part in fresh water

Anadromous fish - born in freshwater, reach adulthood at sea

Catadromous fish - born in ocean, reach adulthood in freshwater

Name examples of common fishes, their characteristics, habitats, population status in temperate parts of North America?

Salmonoids - Anadromous life history, adipose fin, important culturally (Atlantic salmon)

Brook trout - prefers cool water w/ o2, slower water, anadromy

Sturgeons - spiny-rayed fish, secondly derived skeleton (?)

Sea Lamprey - Semelparous, Anadromous, migratory (?)

Striped Bass - Not extinct or endangered

Minnows - 12 NB species, warmwater, small bodied, variety of habitats and habits

Suckers - bottom dwellers, spring spawner, migrations, slow habitat

Sticklebacks - littoral species (area close to shore in pond or lakes where light reaches the bottom), small bodied, 5 species in NB, abundant/common

Name common invasive fish species in NB

1. Rainbow trout 

2. Small and Large mouth bass

3. Chain pickerel

What is the potential issue with invasions

They could displace the native fish by competition, they are almost impossible to remove, social acceptance/rejection (“come back” of predators)

Label

1. 2nd dorsal fin

2. 1st dorsal fin (spiky)

3. fin insertion or origin

4. caudal fin

5. anal fin

6. pelvic fin

7. pectoral fin

Label

1. caudal fin

2. adipose fin

3. dorsal fin

4. anal fin

5. pelvic fin

6. pectoral fin

What is the role and sources of carbon in rivers?

Provides energy to lotic ecosystems

Sources : Autochtonous inputs (Algae) and Allochtonous inputs (Woody debris/leaves)

What is autochtonous production?

Organic matter produced in the stream

ex. Algae (Perifyton Slimy stuffwith algae, bacteria, fungi etc.. in saccharide matrix*), Macrophytes (Mosses) *Rivers, and Phytoplankton *Lakes and Large Rivers

What is allochtonous production?

Organic Matter produced outside of the stream 

ex. Forests, fruits, animal carcasses, sewage and agricultural inputs

Describe forms of organic matter?

(DOM, FPOM, CPOM)

1. DOM - Fragments so small it is dissolved in to the water (<0.5µm)

2. FPOM - fragments are very fine, but are actual particles/clumps (<1mm and >5 µm)

3. CPOM - fragments are just larger that the FPOM (>1mm)

What does autotrophy and heterotrophy mean?

autotrophy - more independent because there is high carbon production, and slower moving dependance of the organic material 

ex.  Larger Rivers

heterotrophy - dependance on the organic material

ex. Small Headwater

What is River Continuum Concept (RCC)?

A key concept on “how rivers work” by using a predictable continuum (Applicable to the temperate system)

Key Ideas 

1. Physical Envm. - Solar input, temperature, and discharge varies

2. Biological Envm - Allochtonous inputs dominate upstream, Autochtonous inputs dominate downstream, functional feeding group vary

CRITICISMS - TEMPERATE STREAM BIAS, APPLICABLE TO PRISTINE STREAMS ONLY, PATTERN OF TEMPERATURE CHANGE

Name and describe other river ecosystem productivity models? How do they differ form RCC

Riverine Productivity Model (RPM) - Emphasis on the local processes (Higher P/R ratio on the banks where the light penetration is higher) *Localized little bathtub rings

Flood-Pulse Concept (FPC) - Emphasis on lower flood-plain processes (Pulses are natural predictable disturbances to which biota are adapted, and not having this hydrologic regimen is the real disturbance) *Latitudinal connectivity

Is the ecosystem efficiency in headwater streams high or low?

Generally Low, most ends up sent to the ocean unprocessed. (its like tossing 50% of your cash away)

1. River continuum concept

2. Flood pulse concept

3. Riverine productivity Model

What are Marine Derived Nutrients?

Aquatic vectors bring in nutrients and organic material from alternative sources

• Lakes (potamodromous fish; e.g. whitefish)

• Oceans (anadromous fish; e.g. salmon, river herring)

What benefits to different ecosystem components (biofilm, animals, forests) MDN’s have?

1. MDN’s can provide a boost to N supply for those plants that need it

2. They provide nitrogen boosts to the forests

3. Biofilm enrichment boosts grazing insect populations (BMI)

4. Many species (trout, char, sculpins, insects) consume salmon eggs.

Evidence of MDN’s in West Coast?

Sitka spruce (Picea sitchensis) – 24% of foliar N from salmon (Grew marginally better in spawning areas. 

Alders dont really care to use the salmon N because they can fix their own nitrogen 

Evidence of MDN’s in East Coast?

while we don’t have as much salmon, we have a greater variety of species… NOT DONE YET

How do MDN’s affect river ecosystem in East Coast?