No-analog (ecology)

In paleoecology and ecological forecasting, a no-analog[1] community or climate is one that is compositionally different from a (typically modern) baseline for measurement.[2][3] Alternative naming conventions to describe no-analog communities and climates may include novel, emerging, mosaic, disharmonious and intermingled.[3][4][5][6] Modern climates, communities and ecosystems are often studied in an attempt to understand no-analogs that have happened in the past and those that may occur in the future.[3] This use of a modern analog to study the past draws on the concept of uniformitarianism. Along with the use of these modern analogs, actualistic studies and taphonomy are additional tools that are used in understanding no-analogs.[7] Statistical tools are also used to identify no-analogs and their baselines, often through the use of dissimilarity analyses or analog matching[8] Study of no-analog fossil remains are often carefully evaluated as to rule out mixing of fossils in an assemblage due to erosion, animal activity or other processes.[3]

## Contents

* 1 No-analog climates
* 2 No-analog communities
* 2.1 Quaternary no-analogs
* 2.2 Mammal no-analogs
* 3 Future no-analog climates
* 3.1 Emerging ecosystems
* 3.2 Additional examples
* 4 See also
* 5 References

## No-analog climates

thumb|right|400px|"The [[Pleistocene megafauna#North America|late Pleistocene mammalian fauna of North America [pictured above] has no analog in the corresponding Holocene fauna."[9]]]Conditions that are considered no-analog climates are those that have no modern analog, such as the climate during the last glaciation.[3] Glacial climates varied from current climates in seasonality and temperature, having an overall more steady climate without as many extreme temperatures as today's climate.[6]

Climates with no modern analog may be used to infer species range shifts, biodiversity changes, ecosystem arrangements and help in understanding species fundamental niche space.[10] Past climates are often studied to understand how changes in a species' fundamental niche may lead to the formation of no analog communities.[3] Seasonality and temperatures that are outside the climates at present provide opportunity for no-analog communities to arise, as is seen in the late Holocene plant communities.[3] Evidence of deglacial temperature controls having significant effects on the formation of no-analog communities in the midwestern United States provides example of how intertwined climate and species assemblage are when studying no-analogs.[11]

## No-analog communities

No-analog communities are defined by the existence of extant species in groupings that are not currently seen in modern biomes, or populations that have history of species assemblages that are no longer seen in the modern world.[3] Formation of no-analog communities can be due to multiple factors, including climate conditions, environmental changes, human action, disease or species interactions.[3][4][6] Migrations of species causes displacement and colonization into areas that may have been outside of what was known to be their fundamental niche, such as northern species moving south and mountain fauna being removed entirely or isolated to the peaks.[12][6]

### Quaternary no-analogs

Quaternary fossil records from the Pleistocene present a developed history of no-analogs. Records of plants, mammals, coleopterans, mollusks and foraminifera with no modern analogs are abundant in the fossil record.[3] In the last glacial maximum, species aggregations were different from previous time periods due to a unique set of climate conditions.[6] The development of no-analog plant and mammal communities is often interconnected, and also tied to occurrence of no-analog climates.[3][13] Changes in plant community compositions may also lead to no-analog conditions with addition of biotic pressures such as competition and disease, or enhanced fire regimes.

The North American pollen record provides examples of detailed no-analog plant assemblages from the late quaternary. Pollen assemblages that contain no modern analog are present from many late glacial and early Holocene records, and extend from 14,000 to 12,000 years ago.[7][13] Pollen is a commonly used proxy in studying plant no-analogs. These assemblages are marked by high abundances of taxa such as Betula, the co-occurrence of now allopatric species such as Fraxinus and Picea, and the low abundance of taxa that are now modernly abundant, such as Pinus.[3] These associations are evident across Alaska, eastern North America, Europe and the southwestern US.[3]

The environmental conditions during the Pleistocene offered a climate that was more productive for plant species than climate conditions that exist today.[13] This is evident through extensive records of high abundances of broadleaved trees Ulmus, Ostrya, Fraxinus and Quercus mixed with boreal conifers such as Picea and Larix during the late Holocene.[13][12] New evidence states that deglacial temperatures are now hypothesized to be a major contributor to the formation of no-analog plant communities in the Midwestern US.[11] Christensen bog fauna during this time period also represent a significant example of no-analog assemblages from the Pleistocene.[6] It is also possible that these plant assemblages formed due to influence from megafaunal extinctions during the late quaternary, and there is also evidence that shows connection between novel plant assemblages and new fire regimes.[13]

### Mammal no-analogs

Pleistocene mammal assemblages had high levels of diversity and abundance of megafauna. During the late quaternary extinction there was a loss of many megafauna.[14] This extinction has led to the creation of a no-analog for modern ecosystems, which are lacking high diversity or abundance of large herbivores.

These no-analog mammal assemblages and the loss of megafauna coincides with no-analog plant community rise. The shifts in these groups has been hypothesized to have direct relationship to one another, with the possibility of a release from herbivory pressures causing the bloom in novel plant assemblages during the late quaternary.[13]

## Future no-analog climates

Modern ecologists looking to study future climates and ecosystem assemblages use modern analogs to understand how species distributions will change and how to infer management of ecosystems with climate change. Along with modern analogs, studying past climates and how they've changed is being used to understand future novel climates due to climate changes. Species distribution models are currently being tested with no-analog climates to get more predictive estimates of species range shifts and biodiversity loss.[10]

Examples of modern conditions that are considered no-analogs are also present. Accelerated tree growth due to environmental conditions and pollutants that are present today provide no analog to past conditions of tree growth.[15]

### Emerging ecosystems

The concept of emerging ecosystems originated from the discussion of the ecological and economical fate of agricultural land once it is no longer in use. Similarly to the definition of a no-analog, emerging ecosystems are considered as those that have species composition and abundances that are not seen in modern analogs. Emerging ecosystems not only encompass the understanding of ecological consequences, but also those social, economic and cultural associations. These ecosystems may provide opportunities for species to colonize new niche space.[5]

### Additional examples

Projections of future no-analog communities based on two climate models and two species-distribution-model algorithms indicate that by 2070 over half of California could be occupied by novel assemblages of bird species, implying the potential for dramatic community reshuffling and altered patterns of species interactions[16]

## See also

* Axel Heiberg Island ~80°N is known for its large ~45-million-year-old 'fossil forests'.
* Biogeography
* Ecology
* Effects of global warming
* Ellesmere Island ~80°N is known for its ~55-million-year-old 'fossil forest'.
* Extinction risk from global warming
* La Brea Tar Pits are well known for their fossils of extinct North American megafauna.
* Paleoclimatology
* Paleontology
* Pleistocene rewilding

## References

1. ↑ Variants may omit the hyphen and/or use the British English analogue
2. ↑ Faith, J. Tyler; Lyman, R. Lee (February 2019) (in en). Fundamentals of Ecology and Biogeography. pp. 12–47. doi:10.1017/9781108648608.002. ISBN 9781108648608. https://www.cambridge.org/core/books/paleozoology-and-paleoenvironments/fundamentals-of-ecology-and-biogeography/840000AB1C971913D41E9988BE2727E1/core-reader. Retrieved 2020-04-03.
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 Williams, John W.; Jackson, Stephen T. (2007). "Novel climates, no-analog communities, and ecological surprises" (in en). Frontiers in Ecology and the Environment 5 (9): 475–482. doi:10.1890/070037. ISSN 1540-9309.
4. ↑ 4.0 4.1 Hobbs, Richard J.; Arico, Salvatore; Aronson, James; Baron, Jill S.; Bridgewater, Peter; Cramer, Viki A.; Epstein, Paul R.; Ewel, John J. et al. (January 2006). "Novel ecosystems: theoretical and management aspects of the new ecological world order" (in en). Global Ecology and Biogeography 15 (1): 1–7. doi:10.1111/j.1466-822X.2006.00212.x. ISSN 1466-822X.
5. ↑ 5.0 5.1 Milton, S.J. (2003). "'Emerging ecosystems'--a washing-stone for economists, ecologist and sociologists?". South African Journal of Science 99 (9/10): 404–406.
6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Graham, R.W. (1986). Response of mammalian communities to environmental changes during the late quaternary. pp. 300–314.
7. ↑ 7.0 7.1 Jackson, Stephen T.; Williams, John W. (2004-05-19). "MODERN ANALOGS IN QUATERNARY PALEOECOLOGY: Here Today, Gone Yesterday, Gone Tomorrow?" (in en). Annual Review of Earth and Planetary Sciences 32 (1): 495–537. doi:10.1146/annurev.earth.32.101802.120435. ISSN 0084-6597. Bibcode: 2004AREPS..32..495J.
8. ↑ Simpson, Gavin L.. "Analogue Methods in Paleoecology: using the analogue package". https://cran.r-project.org/web/packages/analogue/vignettes/analogue_methods.pdf.
9. ↑ http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=ENV&recid=1078143 [|permanent dead link|dead link}}]
10. ↑ 10.0 10.1 Veloz, Samuel D.; Williams, John W.; Blois, Jessica L.; He, Feng; Otto‐Bliesner, Bette; Liu, Zhengyu (2012). "No-analog climates and shifting realized niches during the late quaternary: implications for 21st-century predictions by species distribution models" (in en). Global Change Biology 18 (5): 1698–1713. doi:10.1111/j.1365-2486.2011.02635.x. ISSN 1365-2486. Bibcode: 2012GCBio..18.1698V.
11. ↑ 11.0 11.1 Fastovich, David; Russell, James M.; Jackson, Stephen T.; Williams, John W. (2020-04-15). "Deglacial temperature controls on no-analog community establishment in the Great Lakes Region" (in en). Quaternary Science Reviews 234: 106245. doi:10.1016/j.quascirev.2020.106245. ISSN 0277-3791. Bibcode: 2020QSRv..23406245F.
12. ↑ 12.0 12.1 Jackson, Stephen T.; Overpeck, Jonathan T. (2000). "Responses of Plant Populations and Communities to Environmental Changes of the Late Quaternary". Paleobiology 26 (4): 194–220. doi:10.1017/S0094837300026932. ISSN 0094-8373. Bibcode: 2000Pbio...26S.194J.
13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 Gill, J. L.; Williams, J. W.; Jackson, S. T.; Lininger, K. B.; Robinson, G. S. (2009-11-20). "Pleistocene Megafaunal Collapse, Novel Plant Communities, and Enhanced Fire Regimes in North America" (in en). Science 326 (5956): 1100–1103. doi:10.1126/science.1179504. ISSN 0036-8075. PMID 19965426. Bibcode: 2009Sci...326.1100G. http://doc.rero.ch/record/210391/files/PAL_E4398.pdf.
14. ↑ Gill, Jacquelyn L. (2014). "Ecological impacts of the late Quaternary megaherbivore extinctions" (in en). New Phytologist 201 (4): 1163–1169. doi:10.1111/nph.12576. ISSN 1469-8137. PMID 24649488.
15. ↑ Scharnweber, Tobias; Heußner, Karl-Uwe; Smiljanic, Marko; Heinrich, Ingo; van der Maaten-Theunissen, Marieke; van der Maaten, Ernst; Struwe, Thomas; Buras, Allan et al. (2019-02-21). "Removing the no-analogue bias in modern accelerated tree growth leads to stronger medieval drought" (in en). Scientific Reports 9 (1): 2509. doi:10.1038/s41598-019-39040-5. ISSN 2045-2322. PMID 30792495. Bibcode: 2019NatSR...9.2509S.
16. ↑ Stralberg, Diana; Jongsomjit, Dennis; Howell, Christine A.; Snyder, Mark A.; Alexander, John D.; Wiens, John A.; Root, Terry L. (2009-09-02). "Re-Shuffling of Species with Climate Disruption: A No-Analog Future for California Birds?" (in en). PLOS ONE 4 (9): e6825. doi:10.1371/journal.pone.0006825. ISSN 1932-6203. PMID 19724641. Bibcode: 2009PLoSO...4.6825S.

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