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Coarse-scale riverine process domains of Pacific Northwest drainage basins

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Coarse-scale riverine process domains of Pacific Northwest drainage basins. Montgomery, David R. 1999. Process Domains and the River Continuum. J. Am. Water Res. Assoc. Vol. 35, no. 2. Process Domains Conceptual Model. Headwater Reaches Colluvial Transfer Reaches Bedrock Cascade

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slide1
Coarse-scale riverine process domains of Pacific Northwest drainage basins

Montgomery, David R. 1999. Process Domains and the River Continuum. J. Am. Water Res. Assoc. Vol. 35, no. 2.

slide2
Process Domains Conceptual Model
  • Headwater Reaches
  • Colluvial
  • Transfer Reaches
  • Bedrock
  • Cascade
  • Step-pool
  • Depositional Reaches
  • Plane-bed
  • Pool-riffle
  • Regime
  • Braided

Montgomery 1999

slide3
Carl Sammons

Process Domains and the Aquatic and Riparian Herpetofauna: An Ecogeographic Study of the Mattole Watershed

Hartwell H. Welsh, Jr. and Garth R. Hodgson

Redwood Sciences Laboratory, Arcata, California

slide4
Kilometers

0 2 4 6

Geomorphic Process Domains of the Mattole

Mattole Watershed

Longitudinal profiles

Cascade

Step pool

Plane bed

Pool riffle

1

Petrolia

Honeydew

2

3

Ettersburg

Channel morph.

Type

1 Cascade

2 Step pool

3 Plane bed

4 Pool riffle

4

Whitethorn

N

Shelter

Cove

slide5
NMS2

I

II

III

IV

Reach Types based on Non-metric Multidimensional Scaling Ordination

  • Variables used in NMS ordination:
  • Sub-basin area
  • Roughness
  • Slope
  • Substrates

I

II

NMS2 groups

Reach Type I

Reach Type II

Reach Type III

Reach Type IV

III

IV

slide6
NMS2

I

II

III

IV

slide7
Species Distribution by Process Domains

Amphibian richness

Rough-skinned newt

Coastal giant salamander

I II III IV

Channel Types

I II III IV

Channel Types

I II III IV

Channel Types

Tailed frog

S. torrent salamander

I II III IV

Channel Types

I II III IV

Channel Types

slide8
Water temperature

Canopy closure

Water temperature (oC)

Canopy closure (%)

I II III IV

Channel types

I II III IV

Channel types

Key Differences Between Channel Types

slide9
Water Temperature niches of four species

15.8

Coho

DITE

ASTR

RHVA

12.8

11.7

11.4

Water temperature (oC)

Water Temperature Realized Niches

slide10
The Stream Continuum Concept

the network environment changes continuously and predictably

Abiotic gradients

Flow rate

Light

Water temperature

Water chemistry

Substrate composition

Larger in smaller streams

Biotic gradients

Bacteria

more in slower water

Primary producers

Phytoplankton and periphyton

Macroinvertebrates

Insects to crayfish

Vertebrates

Large rivers have more species

slide11
Tailed Frog

Southern Torrent Salamander

Late Seral

Petrolia

Honeydew

Ettersburg

Pacific Ocean

Whitethorn

N

Shelter

Cove

km

0

1

2

3

4

5

Late-seral Forest in the Mattole in 1947 and 1997

1947

1997

Data from: Welsh, H. H. Jr., G. R. Hodgson, and A. J. Lind. 2005. Ecogeography of the herpetofauna of a Nothern California watershed: linking species patterns to landscape processes. Ecography, Vol. 28: 521-536.

slide12
Olson, D. H., P. D. Anderson, C. A Frissell, H. H. Welsh, Jr., D. F. Bradford. 2007. Biodiversity management approaches for stream-riparian areas: Perspectives for Pacific Northwest headwater forests, microclimates, and amphibians. Forest Ecology and Management 246: 81-107.
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