(Upload on May 1 2024) [ 日本語 | English ]

Flora (フローラ)

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Flora (pl. floras or florae) (植物相)
The plant species found in one or more regions, or eras (Dunster & Dunster 1996)
Fauna (動物相)
The animal species found in one or more regions, or eras

How to use (Examples)

  • Flora of Japan
  • Flora of Hokkaido
  • Flora of Sapporo
  • Flora of Mount Usu
  • Flora of lawn in the campus of Hokkaido University
Flora lists in this site

Mount Usu, Mount Koma, Chise-Frep in Shihoro, Plant species in Washington


Biota (生物相)

= fauna + flora

Ex. land biota, benthic biota, African biota
biosphere (生物圏)

Case: Characteristics of flora on Mount Koma

Based on research in 2000

Seventy-five seed plant species (露崎他 2001)
Common species on mountainous, volcanic areas
(Specimen collected from the mountain)
Coastal plant species

Ex. Chimaphila umbellata (L.) W. Barton: collected from the southwestern slope at ca 500 m in elevation at at August 3, 2000. This species generally establish in forests near sea coast.

Alpine and/or subalpine plant species

Ex. Campanula lasiocarpa Cham.: collected from the southwesten slope at August 3, 2000. This species is an alpine plant.

Carnivorous plant species

Ex. Drosera rotundifolia L.: collected from the southwestern slope at ca 850 m in elevation at August 13, 2000. This species is a typical carnivorous plant.

These specimens have been stored in the Hokkaido University Herbarium.

What we can say from the flora on Mount Koma

  1. We have to consider the effects of sea coast flora on vegetation.
  2. Tree line is depressed, perhaps due to volcanic activities.
  3. Soil nutrients have been low, and thus carnivorous plants may establish.

[Geography, Island biogeography, GIS]

Biogeography (生物地理学)

1805 Humboldt A: Essai sur la géographie des plantes
1855 DeCandolle A: Géographie botanique raisonée ou exposition de faits principaux et des lois concernant la distribution de plantes de l'époque acuelle
1872 Griesebach: La végétation du globe d'aprés la disposition suivant les climats
1953 Good R: The geography of the flowering plants

kingdom > region > province > district

Ecozone (生物地理区) or biogeographical region

(Fattorini 2015)

  1. global chorotype: groups of species with overlapping ranges (overall distributions)
  2. regional chorotype: a similar distribution within a certain area


A. Continental distribution type
a. Continental chain
b. Distribution pattern of taxa over species Wallace
Fig. The terrestrial zoogeographic realms and regions of the world. Zoogeographic realms and regions are the product of analytical clustering of phylogenetic turnover of assemblages of species, including 21,037 species of amphibians, nonpelagic birds, and nonmarine mammals. Dashed lines delineate the 20 zoogeographic regions identified in this study. Thick lines group these regions into 11 broad-scale realms, which are named. Color differences depict the amount of phylogenetic turnover among realms. Dotted regions have no species records, and Antarctica was not included in the analyses (Holt et al. 2013).
B. Geographical distribution (地理分布)
most popular one is Wallace
Huxley (1868): 4 regions
  1. Arctogaea (北界): Arctogaea
  2. Notogaea (南界)
    • Austro-Columbia (中南米)
    • Austral-Asia
    • New Zealand
Phillip (1874): proposed zoogeographic regions based on avifauna
Wallace (1876): 24 subregions in 6 regions, based on the proposal of Slater
  1. Palaearctic Region (旧北区).: European subregion, Mediterranean, Siberian, Manchurian
  2. Ethiopian Region (エチオピア区).: East-African, West African, South-African, Malagasy (Madagascar)
  3. Oriental Region (東洋区): Hindostan (中央インド), Ceylon, Indo-Chinese (Himalayan), Indo-Malayan
  4. Austrasian Region (オーストラリア区): Austro-Malayan, Australian, Polynesian, New Zealand
  5. Neotropical Region (新熱帯区): Brazilian, Chihan (S. Temperate American), Mexican, Antillean
  6. Nearctic Region (新北区): Californian, Rocky Mountain, eastern Alleganian, Canadian

→ Japan is located on a boundary between Oriental and Palaearctic Region

Fig. The original zoogeographical realms.
Wallace Line (ウォレス線): the boundary between Oriental and Austrasian Regions

Mammals in in New Guinea - characterized by Australian mammals, e.g., marsupials (wallabies, bandicots and marsupial mice) and monotremes (spiny anteaters)
Mammals in Sunda - many large mammals inhabiting in southeastern Asia

Revised based on Dickerson RE. 1928. Distribution of life in the Philippines. Bureau of printing

Weber Line (ウェーバー線) (Weber 1888): rejected the significance of Wallace Line by the distribution of freshwater fish

Dahl (1925): nine subregions in four regions
  1. Arctogean Realm: Arctic Province, Euro-Mediterranean, East-Asian, Snoran
  2. Etlhiopian R.: West-African, South-African, East African, Madagascarene
  3. Indo-Australian R.: Indian, Malayan, Papuan, Australian, Nove-Zealandian, Polynesian, Hawaiian
  4. Neogean R.: Central American, Antillean, Brazilian, Chilian
Pacific Ocean
Fig. The Pacific Ocean, showing the biogeographical areas of Malesia, Melanesia, Micronesia and Polynesia (Mueller-Dombois & Fosberg 1998). New Caledonia, Hawaii and New Zealand are not included in Polynesia or Melanesia because of their unique biotas. BA, Bismarck archipelago; CAL, New Caledonia; FIJ, Fiji; NG, New Guinea; SOL, Solomon Islands; VAN, Vanuatu. (Hawaii is included in Polynesia in case.)
Melanesia: vlcanoes enclosed by coral reefs in tropical regions
Polynesia: coral reefs, except Hawaiian volcanoes
Micronesia: coreal reefs with a few voclanoes
+ Malesia

Insect fauna: characterized by fauna in Oriental Region + islandic factors
Decreasing animal diversities from west to east with increasing the distance from mother lands

Japan (日本)
Biodiversity hotspots, because of high biodiversity
Blakiston Line (ブラキストン線): Tsugaru Strait - mammals and birds

named by Milne, John (1850-1913, England)

Blakiston, Thomas Wright (1832-1891, England), zoologist (bird)

1857-1859: Palliser Expedition - western Canada
1860 Yangtze River in China (military duty)
1861, 1863-1884 Hakodate

animals in Hokkaido are related to northern Asian species

Body size on animals

Bergmann's rule (ベルクマンの法則)
Bergmann, Carl (1814-1865, Germany), anatomist and physiologist
1847: body size - temperature

populations and species of larger size are found in colder environments and species of smaller size are found in warmer regions within a broadly distributed taxonomic clade
Ex. 1969 Brown & Lee: woodrats (Neotoma)

linear and negative relationship between temperature and body weight

Allen's rule (アレンの法則)
Allen, Joel Asaph (1838-1921, USA), zoologist
1877: appendage - climate

animals adapted to cold climates have shorter limbs and body appendages than animals adapted to warm climates

[ University of Hawai'i at Manoa, Botany ]

Hawaii (ハワイ)

Characteristics of islandic biota

a) endemic species
b) disharmonic biota

Endemic plants

Metrosideros polymorpha Gaudich. (ハワイフトモモ)

well-established on lava

Exotic plants

many exotics as well as in Japan and NZ
Ex. Albizia saman (Jacq.) Merr. (monkey pod or rain tree, アメリカネム)

Origin: Mexico - Brazil (biologically-invasive species to Hawaii)

Predicted distribution (分布推定)

Species distribution models (SDMs)

≈ bioclimatic models, climate envelopes, ecological niche models (ENMs), habitat models, resource selection functions (RSFs), range maps, etc.
to predici species distribution (Elith & Leathwick 2009)
key assumptions = species are at equilibrium with their environments

confirming if the assumption is supported
prediction → extrapolation
weak linkages between SDM practice and ecological theory

Basic SDMs
  1. gathering relevant data
  2. assessing its adequacy (the accuracy and comprehensiveness of the species data; the relevance and completeness of the predictors)
  3. deciding how to deal with correlated predictor variables
  4. selecting an appropriate modeling algorithm
  5. fitting the model to the training data
  6. evaluating the model including the realism of fitted response functions, the model's fit to data, characteristics of residuals, and predictive performance on test data
  7. mapping predictions to geographic space
  8. selecting a threshold if continuous predictions need reduction to a binary map
  9. iterating the process to improve the model in light of knowledge gained throughout the process


= genetic algorithm for rule-set production
Data: using presence/absence data
rule sets derived with genetic algorithms, using desktop version PA DesktopGarp


envelope model (using diva-gis)


regression, a fast implementation of a GAM (mda in R)


multivariate distance, using diva-gis (Carpenter et al., 1993)


boosted decision trees, gbm package in R


generalized linear model, using R


multivariate adaptive regression splines, using mda in R to handle binomial responses


modified MARS, interactions allowed

MaxEnt model

= Maximum entropy model (Phillips et al. 2006)
= community assembly by trait selection (CATS)
→ species distribution and environmental niche modeling
  1. MaxEnt typically outperforms other methods based on predictive accuracy
  2. the software is particularly easy to use
  • probability distributions given constraints on their moments
  • relative abundance distributions based on the number of individuals, species and total energy
  • community composition along ecological gradients based on traits
  • species distributions based on environmental covariates
  • associations in food webs
  • much more …
  • presence locations, absence data are not required
  • background locations (not pseudo-absences) should be chosen → influencing the prediction
    sampling bias (Merow et al. 2013)
  • a gridded landscape
  • environmental covariates for each landscape grid cell
  • optional - measure of sampling effort in each cell
  • optional – a landscape on which to project your predictions
Entropy maximization
two parts: a constraint component and an entropy component
1) Constraint component
  • the data define moment constraints on the probability distribution
  • the temperature at the all the presence locations define the mean, variance, etc. of the temperature where the species occur
  • Maxent requires that the predicted distribution fulfills these constraints
2) Entropy component
  • Many distributions could fulfill these constraints
  • Maximizing entropy is a method to choose among the many probability distributions that fit your data
  • Maxent starts by assuming the probability is perfectly uniform in geographic space and moves away from this distribution only to the extent that it is forced to by the constraints
  • the output is a probability distribution that sums to 1
    omission rate / auc → roc (receiver operating character) curve
  • for species distributions this gives the relative probability of observing the species in each cell
  • cells with environmental variables close to the means of the presence locations have high probabilities