plants of the limestone barrens
Download
Skip this Video
Download Presentation
Plants of the Limestone Barrens

Loading in 2 Seconds...

play fullscreen
1 / 96

Plants of the Limestone Barrens - PowerPoint PPT Presentation


  • 172 Views
  • Uploaded on

Plants of the Limestone Barrens. A Presentation by John Maunder Curator Emeritus of Natural History The Rooms Provincial Museum of Newfoundland and Labrador The Limestone Barrens Habitat Stewardship Program Conservation and Sustainable Ecotourism Conference Plum Point, Newfoundland

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Plants of the Limestone Barrens' - caine


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
plants of the limestone barrens

Plants of the Limestone Barrens

A Presentation by John Maunder

Curator Emeritus of Natural History

The Rooms

Provincial Museum of Newfoundland and Labrador

The Limestone Barrens Habitat Stewardship Program

Conservation and Sustainable Ecotourism Conference

Plum Point, Newfoundland

October 12-13, 2006

slide3

At first glance, there’s almost nothing there!

Burnt Cape [photo: Pat Montegue]

slide6

Flowers Cove

You’ll see an amazing garden of botanical treasures!

slide9

But, what’s all the fuss

about?

Alpine Ragwort - Packera pauciflora – L’Anse aux Meadows

slide13

Northern Anemone - Anemone parviflora – Burnt Cape

But most aren’t …It’s all a bit complicated

our limestone barrens species fall into about 5 special categories
Our limestone barrens species fall into about 5 special categories …

… grouped by their general distribution

near Eddies Cove West

slide15

1. Newfoundland Endemic “Limestone-Loving” Species

Species found only in Newfoundland, in the whole world!

slide18

Long’s Braya – Braya longii

Sandy Cove and Yankee Point

slide19

… and, MAYBE?

“Burnt Cape Cinquefoil” -Potentilla usticapensis … [orPotentilla pulchella var. pulchella]

… There are varying taxonomic interpretations

… so its endemic status is uncertain

Burnt Cape

slide20

2. Gulf of St. Lawrence Endemic “Limestone-Loving” Species

Species found only in the Gulf of St. Lawrence region (which includes the Newfoundland west coast and Strait of Belle Isle), in the whole world!

slide24

3. Disjunct “Limestone-Loving” Species

Species found both in some far-away place, AND in our area, with a BIG GAP in between.

slide25

Dwarf Hawk’s Beard – Crepis nana – Burnt Cape …. Disjunct to N tip of Labrador, and arctic and western North America

slide26

Newfoundland Orchid – Pseudorchis albida subsp. straminea

Burnt Cape - Disjunct to Greenland and one locality in Hudson Bay

slide27

Woolly Arnica – Arnica angustifolia subsp. tomentosa – Point Riche Peninsula … Disjunct to mountains of northwestern North America [photo: Rene Charest]

slide28

Pendantpod Oxytrope - Oxytropis deflexa var. foliosa – disjunct [from S Labrador] to N tip of Labrador, Gaspe, Hudson Bay, and low arctic and western North America

slide29

Bodin’s Milkvetch – Astragalus bodinii – Cook’s Harbour … disjunct to western North America

slide34

Frog Orchid – Dactylorhiza viridis

Killdevil Mountain [photo: M. Anions] and Burnt Cape

slide39

White Mountain Avens – Dryas integrifolia

Sandy Cove [photo: N. Djan-Chekar] and Flowers Cove [photo: Pat Montague]

slide45

5. Widespread Species which are not “Limestone Loving”

They’ll grow almost anywhere!

slide49

How do the plants manage it?

Trailing Juniper - Juniperus horizontalis – Port au Choix [photo: Pat Montague]

slide50

What conditions do they have to overcome?

Alpine Pussytoes – Antennaria alpina subsp. canescens – Watt’s Point

slide53

The first challenge is DRYNESS … even in areas that receive a lot of moisture

Burnt Cape [photo: Pat Montague]

slide54

Wind is usually the critical factor … especially in winter.

It’s not hard to tell how deep the sheltering snow gets in this area!

Eddies Cove

slide55

Trailing Juniper – Juniperus horizontalis – Port au Choix [photo: Pat Montegue]

Even in summer, it helps to have a low profile to stay out of the drying wind, and within the thin, sun-warmed, surface air layer

slide56

Dwarf Hawk’s Beard – Crepis nana – Burnt Cape

Tight cushion architecture can conserve a core of dampness within the cushion

slide57

Flowers Cove, “White Rocks”

Some plants find other ways to stay out of the wind

slide59

Other plants just grow smaller in exposed areas [while usually preserving flower size!]

Greenland Primrose – Primula egaliksensis – Cook’s Harbour and Boat Harbour

slide60

Rand’s Eyebright - Euphrasia randii – Cape St. Francis

Hair creates a layer of dead air against the plant surface to help slow moisture loss when the plant’s pores are open

slide61

Netvein Willow – Salix reticulata – Lower Cove

Waxy and leathery surfaces help slow water loss from the surface

slide62

Reddish Sandwort - Minuartia rubella – Port Saunders

Narrow leaves with less leaf surface area lose less water

slide64

However, cold is only partly a winter concern. For most arctic and alpine plants, once the temperature has dropped below a certain point, cold is just cold

slide65

W of Red Bay, Labrador, July 12, 2001

The main thing affected by cold is the total length of the growing season …

slide66

L’Anse-Amour, Labrador

This photo was taken July 8 – and the willows are still just in early bud!

slide67

Moss Campion – Silene acaulis – Burnt Cape

  • Tight cushion architecture allows for a layer of “dead air”, within the cushion, that can warm up and stay warm all day
slide69

… seen most dramatically in patterned ground

Burnt Cape [photo: Pat Montague

slide70

Daubenmire (1941)

tap roots anchor plants deeply into the seasonally-disturbed frost-heaved soils

This rare species, the Cutleaf Fleabane, grows in Humber Gorge

slide71

Long’s Braya – Braya longii – Yankee Point

Some roots are contractile ... each time a plant is heaved upward by frost, the root of the affected plant shortens to pull the plant back down into the soil, where it belongs.

slide72

The third challenge of the barrens is obtaining sufficient NUTRIENTS. Barrens usually occur on thin, poor soils.

Boat Harbour

slide73

The THINNESS of the soil is largely the result of ice-age glacial scouring …

Glacial Striae – Hawkes Bay

slide74

Cape Norman

… and subsequent wind and water erosion.

slide75

Cape Norman

The POORNESS of the soil is usually the result of its basic geology, or of its history of poor organic accumulation in places where vegetation has long been sparse.

slide76

Cape Norman

But even here, plants manage to grow …

slide78

In general, precipitation tends to run off quickly … or just drain away, downwards, through the substrate …

carrying unconsolidated nutrients with it.

Port au Choix

slide79

Oval-leaf Spearwort – Ranunculus flammula var. ovalis – Port au Choix

Even so, some species, like this buttercup, seem to need such changing conditions!

slide80

Arctic Bladderpod - Lesquerella arctica – Burnt Cape

As you have already seen, plants of the barrens have all kinds of survival tricks

slide81

Moss Campion – Silene acaulis

Daubenmire (1941)

LONG ROOT SYSTEMS are critical in accessing scarce moisture and nutrients from a very wide area of soil

slide82

EVERGREEN LEAVES conserve hard-won and costly resources that would otherwise be lost, and have to be regenerated every year …

Hollyfern - Polystichum lonchitis – Burnt Cape

slide83

….and, as long as evergreen plants stays relatively green throughout the year, photosynthesis can take place, on warm days, in any season, effectively lengthening the plant’s growing season

Trailing Juniper – Juniperus horizontalis – Port au Choix

slide84

In the limestone barrens, the chemistry of calcium adds to the challenge

Encrusted Saxifrage - Saxifraga paniculata – Burnt Cape

This saxifrage secretes excess lime from the edges of its leaves

slide85

A major advantage of living on the barrens – is a lack of competition!

Dwarf Hawk’s Beard – Crepis nana – Burnt Cape

slide86

Many barrens species, such as Long’s Braya, actually thrive in disturbed areas where nothing else tends to grow

Yankee Point

slide88

Alpine Milkvetch – Astragalus alpinus var. alpinus – Burnt Cape

… with the rarer ones just making it …

slide89

Balsam Ragwort – Packera paupercula var. balsamitae – Indian River

… and some others doing much better

slide91

… will climate change help Long’s Braya … but hinder Fernald’s Braya?

… or vice-versa?

… or neither!

We might guess … but we really don’tknow.

slide94

… and humans in general continue to expand their influence

Heavy equipment re-arranging the Romaines River floodplain, August 1, 2006 !

slide96

… any many discoveries to make!

… End

Crab Spider on Yellow Lady Slipper – Burnt Cape

ad