(Dis)Assembly of the Great Lakes Forests
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1 (Dis)Assembly of the Great Lakes Forests
2 The Questions Pleistocene placement of the forests - where did they hang out Holocene migrations - how and when did they assemble into the Great Lakes Recent past, present, and future changes the dis-assembly?
3 Vegetation vs. Flora Vegetation refers to the physical appearance (physiognomy) of the forest type - ecology driven Flora refers to the species (genus, family) composition of any given forest - history driven Northern hardwood forests in WI and MI have sugar maple, but beech co-dominates mainly in MI
4 Pleistocene - the Ice Ages The vegetation and flora as we see it now (Holocene) was dramatically affected by Pleistocene events
5 Pleistocene - the Ice Ages What s wrong with this map? In the Tertiary, earth experienced intensification towards climatic cooling Culminated with a series of glacialinterglacial cycles in Pleistocene Wisconsin Driftless Area North American flora and vegetation profoundly influenced by these ice-age events
6 Pleistocene - the Ice Ages Break-up of the great Northern Hemisphere Arcto- Tertiary forests
7 Pleistocene - the Ice Ages Wisconsin glaciation (last epoch) most important - maximum at 18,000 ya Assembly of flora and vegetation of most Great Lakes was during the late Pleistocene and Holocene - (14,000 ya to present)
8 Pleistocene - the Ice Ages Ice-free Areas Southern North America of glaciers Beringia, much of Alaska, Siberia Coastal plains, steep coastlines of Pacific northwest Wisconsin Driftless Area - never completely surrounded by ice
9 Pleistocene - the Ice Ages Ice-free Areas North America south of glaciers Beringia, much of Alaska, Siberia Coastal plains, steep coastlines of Pacific northwest Wisconsin Driftless Area - never completely surrounded by ice
10 Pleistocene - the Ice Ages What was happening south of the glacial maxima??
11 Pleistocene - the Ice Ages Paleobotanists aided by the pollen record (especially trees) in lakes and bogs to understand Pleistocene vegetation and flora
12 Pleistocene - the Ice Ages Yearly deposits accumulate in lake bottoms to be covered by silt in layers, or in bog peat strata
13 Pleistocene - the Ice Ages Pollen record of White Pond, South Carolina (33 o N) Note boreal elements (spruce) early in the record
14 Pleistocene - the Ice Ages Pollen record of Wood Lake, WI (45 o N) Note boreal elements (spruce) early in the record
15 Pleistocene - the Ice Ages Extensive boreal (taiga) forest zone to 33 S Mixed deciduous forest zone near Gulf 18,000 ya harshest conditions; zones were further north earlier 18,000 ya 28-25,000 ya
16 Pleistocene - the Ice Ages Much of eastern North America would have looked like this boreal scene White spruce - Picea glauca Most widespread tree in North America Illinois 16K years ago
17 Pleistocene - the Ice Ages 14,000 ya ice begins retreat Vegetation units move north Proglacial lakes form St. Lawrence Seaway exposed Lake Agassiz 13,000 ya 11,000 ya
18 Holocene - the Recent Times Ice retreats continues into Holocene (10,000 ya) Warmest time of Holocene is Hypsithermal - 8,500 to 6,000 ya Prairie peninsula extends east 8,000 ya Present
19 The Questions Pleistocene placement of the forests - where did they hang out Holocene migrations - how and when did they assemble into the Great Lakes Recent past, present, and future changes the dis-assembly?
20 Assembly of Flora & Vegetation How and when did this assembly in the Great Lakes happen? 18,000 ya Present
21 Assembly of Flora & Vegetation oak beech maple spruce pine Pollen record shows waves of species over time Boreal elements (spruce) early in the Holocene, followed by pines, and then oaks, maples and lastly beech
22 Assembly of Flora & Vegetation tundra boreal Shifts of vegetation belts starting at about 13,000 ya with tundra, spruce, pine, northern hardwood, pine-oak, and then oak-hickory mixed hardwood sprucepine pinesprucehardwood oakhickory
23 Assembly of Flora & Vegetation Coniferous species migrated into the Great Lakes region in waves (flora): Boreal species like spruce, tamarack, and balsam fir arrived first
24 Assembly of Flora & Vegetation Coniferous species migrated into the Great Lakes region in waves (flora): Boreal species like spruce, tamarack, and balsam fir arrived first
25 Assembly of Flora & Vegetation Coniferous species migrated into the Great Lakes region in waves (flora): Boreal species like spruce, tamarack, and balsam fir arrived first
26 Assembly of Flora & Vegetation Coniferous species migrated into the Great Lakes region in waves (flora): Xeric pine species like jack pine and red pine arrived next
27 Assembly of Flora & Vegetation Coniferous species migrated into the Great Lakes region in waves (flora):... followed by more mesic loving white pine
28 Assembly of Flora & Vegetation Coniferous species migrated into the Great Lakes region in waves (flora): Hemlock, characteristic of mesic Northern Hardwood forests, arrived last
29 Assembly of Flora & Vegetation Angiosperm hardwoods migrated into the Great Lakes region in waves towards the end of conifer migration: Oaks arrived first from the south - 11,000 ya
30 Assembly of Flora & Vegetation Angiosperm hardwoods migrated into the Great Lakes region in waves towards the end of conifer migration: Elms arrived at about the same time from the southeast - 11,000 ya
31 Assembly of Flora & Vegetation Angiosperm hardwoods migrated into the Great Lakes region in waves towards the end of conifer migration: Hickories arrived shortly thereafter from the southwest - 10,500 ya
32 Assembly of Flora & Vegetation Angiosperm hardwoods migrated into the Great Lakes region in waves towards the end of conifer migration: Followed by mesic-loving maples...
33 Assembly of Flora & Vegetation Angiosperm hardwoods migrated into the Great Lakes region in waves towards the end of conifer migration:... and finally American beech last
34 Assembly of Flora & Vegetation Rate of species migration (shown in the chart below as miles per year) is dependent on a number of factors: location during Pleistocene ecological climate envelope of each species type of seed/fruit dispersers seed dispersal rate (seed/fruit weight given in mg)
35 Assembly of Flora & Vegetation Rate of species migration (shown in the chart below as miles per year) is dependent on a number of factors: Red pine vs. American beech location during Pleistocene ecological climate envelope of each species 8.7 mg 280 mg type of seed/fruit dispersers seed dispersal rate (seed/fruit weight given in mg)
36 Assembly of Flora & Vegetation Importantly, the different species of trees (and herbs) entering the Great Lakes region after the glaciers retreated entered via different routes - that is, they came from different refugia or survivia White pine from the Alleghenian refugium and present distribution
37 Dis-assembly of the forests? Pinus strobus - white pine Tsuga canadense - hemlock
38 Assembly of Flora & Vegetation Importantly, the different species of trees (and herbs) entering the Great Lakes region after the glaciers retreated entered via different routes - that is, they came from different refugia or survivia Alleghenian Ozarkian Oaks from either the Alleghenian (white oak) or Ozarkian (bur oak) refugia and present overlapping distributions
39 Assembly of Flora & Vegetation The flora of the Great Lakes can be divided into a number of elements, each of which shares a common geographical origin (refugia). Closely related species (such as oaks) can often be part of different floristic elements. This is due to both different ecological preferences (such as hydric vs. mesic vs. xeric) and to geographical origin. Quercus - the oaks
40 The Questions Pleistocene placement of the forests - where did they hang out Holocene migrations - how and when did they assemble into the Great Lakes Recent past, present, and future changes the dis-assembly?
41 Dis-assembly of the forests? Substantial changes in forest and prairie communities since presettlement times due to urbanization, farming, and forestry How do we know what presettlement forests or community types were actually present?
42 Dis-assembly of the forests? How do we know what presettlement forests or community types were actually present? The General Land Office surveys of the 1800s required that a rectangular system of land survey be done. Trees nearest each quarter section corner were bark-slashed, identified, and dbh recorded.
43 Dis-assembly of the forests? Shown here is such a Witness Tree from the NE corner of section 18 in Hamlin Township (R18W, T19N) north of Ludington, Michigan.
44 Dis-assembly of the forests? Shown here is such a Witness Tree from the NE corner of section 18 in Hamlin Township (R18W, T19N) north of Ludington, Michigan. A close up of the slashed tree shows the original surveyor s marks: R 18 W T 19 N 18
45 Dis-assembly of the forests? Original wood stakes have been replaced by permanent metal stakes. This stake marks the sectional corner between sections 3, 2, 10, and 11 in a township in Kalkaska County, Michigan.
46 Dis-assembly of the forests? Climate change ground truthing with forest species shifts
47 Dis-assembly of the forests? Climate change ground truthing with forest species shifts Shifts in 78 species distributions from 1950s 2000s Shifts in climate envelope of 78 species from 1950s 2000s Lag in geographic shift relative to climate shift of 78 species Ash et al Tracking lags in historical plant species shifts in relation to regional climate change
48 Dis-assembly of the forests? Climate change Pleistocene oscillations
49 Dis-assembly of the forests? Global temperature increase and climate change highest record in Pleistocene CO 2 concentration (showing annual cycle) increasing from 315 ppm to 410 over last 60 years Measured at top of Mauna Loa, Hawaii
50 Dis-assembly of the forests? Why annual cycle? Global temperature increase and climate change CO 2 concentration (showing annual cycle) increasing from 315 ppm to 410 over last 60 years Measured at top of Mauna Loa, Hawaii
51 Dis-assembly of the forests? Global temperature increase and climate change Last 4 years CO 2 concentration increasing from 395 ppm to 410 ppm Measured at top of Mauna Loa
52 Dis-assembly of the forests?
53 Dis-assembly of the forests?
54 Wisconsin phylogenetic tree - genealogy of all species DNA Barcode tree increased suitable habitat by 2070 decreased suitable habitat by 2070 Spalink et al. Wisconsin Dimensions of Biodiversity Project
55 Impacts of climate change on suitable habitat Current Species Distribution North of Tension Zone Net loss Net gain North and South of Tension Zone South of Tension Zone % of range remaining climatically suitable in 2070 Spalink et al. Wisconsin Dimensions of Biodiversity Project
56 Dis-assembly of the forests? Epifagus virginiana No matter what projection of global warming is invoked, whole vegetation units (and soil!) need to migrate. Beech drops must track beech migration or go extinct. Beech drops (root parasite only on American beech)
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