Itsuro Koizumi's website
野生生物に学ぶ日々
研究成果
2018+
Fukui S, May-McNally S, Taylor EB and Koizumi I (in press) Maladaptive secondary sexual characteristics reduce the reproductive success of hybrids between native and non-native salmonids. Ecology and Evolution
Yuta T, Nomi D, Ihle M and Koizumi I (in press) Simulated hatching failure predicts female plasticity in extra-pair behavior over successive broods. Behavioral Ecology
Nomi D, Yuta T and Koizumi I (2018) Male feeding contribution facilitates multiple brooding in a biparental songbird. IBIS, 160, 293-300
Nomi D, Yuta T and Koizumi I (2018) Facultative multiple breeding as a female conditional strategy in Japanese tits: partner’s quality affects the initiation of second clutches. Ecological Research, 33, 479-485
Nomi D, Yuta T and Koizumi I. (2018) Seasonal change of sexual differences in nestling size and survival: a framework to evaluate sex-dependent environmental sensitivity in the wild. Avian Research, 9, 10
Ayer C, Katahira H, Fukui S and Koizumi I (2018) Seasonal patterns of downstream movement in partially migratory stream-dwelling Dolly Varden. Ecology of Freshwater Fish, 27, 247-254
Atsumi K, Nomoto K, Machida Y, Ichimura M and Koizumi I (2018) No reduction of hatching rates among F1 hybrids of naturally hybridizing three Far Eastern daces, genus Tribolodon (Cypriniformes, Cyprinidae). Ichthyological Research, 65, 165-167
Yamaura Y, Higa M, Senzaki M, Koizumi I (2018) Can charismatic megafauna be surrogate species for biodiversity conservation? mechanisms and a test using citizen data and a hierarchical community model. In: Nakamura F (Ed.) Biodiversity Conservation Using Umbrella Species: Blakiston’s Fish Owl and Red-Crowned Crane, Springer, pp. 151-179
小泉逸郎（印刷中）想像を超えたヒグマとサケの繋がり：互いに影響する生態と進化、そして生態系全体へ In：「ヒグマ学への招待」北海道大学出版会 pp **-**
2017
Atsumi K and Koizumi I (2017) Web image search revealed large-scale variations in breeding season and nuptial coloration in mutually ornamented fish, Tribolodon hakonensis. Ecological Research, 32, 567-578
Ecological Research Paper Award 受賞！
Atsumi K and Koizumi I (2017) Early maturation of rosyface dace, Tribolodon sachalinensis (Cyprinidae, Cypriniformes) in a small isolated population. Biogeography, 19, 123-126
Yamazaki C and Koizumi I* (2017) High frequency of mating without egg release in highly promiscuous nonparasitic lamprey Lethenteron kessleri. Journal of Ethology, 35, 237-243
国内外のニュースで取り上げて頂きました！
Altmetrics 100 を超えました！
Katahira H, Yamazaki C, Fukui S, Ayer CG and Koizumi I (2017) Spatial aggregation in small spring-fed tributaries leads to a potential metapopulation structure in a parasitic fish leech. Parasitology Open, 3, e11
Koizumi I, Tanaka Y, and Kanazawa Y (2017) Mass immigration of juvenile fishes into a small, once-dried tributary demonstrates the importance of remnant tributaries as wintering habitats. Ichthyological Research, 64, 353-356
国内外のニュースで取り上げて頂きました！
Koizumi I, Kanazawa Y, Yamazaki C, Tanaka Y and Takaya K (2017) Extreme winter aggregation of invasive rainbow trout in small tributaries: implications for effective control. Ichthyological Research, 64, 197-203
解説記事を書きました！
Nomi D, Yuta T and Koizumi I. (2017) Breeding biology of four sympatric tits in northern Japan. Wilson Journal of Ornithology, 129, 294-300
Anders J, Uchida K, Watanabe M, Tanio I, Shimamoto T, Hamada M, Yanagawa H and Koizumi I (2017) Usefulness and limitation of a tiny light-temperature logger to monitor daily activity levels of arboreal squirrels in temperate areas. Mammal Research, 62, 397-404
Uchida K, Suzuki K, Shimamoto T, Yanagawa H and Koizumi I. (2017) Escaping height in a tree represents a potential indicator of fearfulness in arboreal squirrels. Mammal Study, 42, 39-43
2016
Koizumi I. and Shimatani I.K. (2016) Socially induced reproductive synchrony in a salmonid: an approximate Bayesian computation approach. Behavioral Ecology, 27, 1386-1396
Tachiki Y. and Koizumi I. (2016) Absolute vs. relative assessments of individual status in status-dependent strategies under stochastic environments. The American Naturalist, 188, 113-123
Yuta T. and Koizumi I. (2016) Does nest predation risk affect the frequency of extra-pair paternity in a socially monogamous passerine? Journal of Avian Biology, 47, 153-158
Uchida K., Suzuki K., Shimamoto T., Yanagawa H. and Koizumi I. (2016) Seasonal variation of flight initiation distance in Eurasian red squirrels in urban versus rural habitat. Journal of Zoology, 298, 225-231
Fukui S., May-MacNally S., Katahira H., Kitano S. and Koizumi I.* (2016) Temporal change in the distribution and composition of native, introduced, and hybrid charrs in northern Japan. Hydrobiologia, 783, 309-316
Ikeda T, Uchida K, Matsuura Y, Takahashi H, Yoshida T, Kaji K and Koizumi I. (2016) Seasonal and diel activity patterns of eight sympatric mammals in northern Japan revealed by an intensive camera-trap survey. PLoS ONE, 11, e0163602
NHK札幌、毎日新聞など複数のメディアで取り上げて頂きました！
Higa M, Yamaura Y, Senzaki M, Koizumi I, Takenaka T, Masatomi Y. and Momose K. (2016) Scale dependency of two endangered charismatic species as biodiversity surrogates. Biodiversity and Conservation, 25, 1829-1841
NHK札幌、北海道新聞など複数のメディアで取り上げて頂きました！
2015
Nomi D, Yuta T and Koizumi I. (2015) Offspring sex ratio of Japanese Tits Parus minor is related to laying date and clutch size only in the first clutches. Acta Ornithologica, 50, 213-220
Toyama M., Kotaka N. and Koizumi I. (2015) Breeding timing and nest predation rate of sympatric scops owls with different dietary niche breadth. Canadian Journal of Zoology, 93, 841-847
Harris LN, Bajno R, Gallagher CP, Koizumi I, Johnson L, Taylor EB and Reist JD. (2015) Life-history characteristics and landscape attributes as drivers of genetic variation, gene flow and fine-scale population structure in Northern Dolly Varden Char (Salvelinus malma malma) in Canada. Canadian Journal of Fisheries and Aquatic Science, 72, 1477-1493
Ishiyama N, Koizumi I, Yuta T and Nakamura F. (2015) Differential effects of spatial network structure and scale on population size and genetic diversity of the ninespine stickleback in a remnant wetland system. Freshwater Biology, 60, 733-744
Higa M, Yamaura Y, Koizumi I, Yabuhara Y, Senzaki M and Ono S. (2015) Mapping large-scale bird distributions using occupancy models and citizen data with spatially biased sampling effort. Diversity and Distributions, 21, 46-54.
佐藤真理・小泉逸郎．(2015) 魚類から迫る骨の役割：ラボとフィールドからの挑戦. 細胞, 47, 513-516.
2014
Negishi JN, Soga M, Ishiyama N, Suzuki N, Yuta T, Sueyoshi M., Yamazaki C, Koizumi I., Mizugaki S, Hayashida K, Nunokawa M. and Yoshimura N. (2014) Geomorphic legacy controls macrophyte distribution within and across disconnected floodplain lakes. Freshwater Biology, 59, 942-954.
Kobayashi F, Toyama M. & Koizumi I.* (2014) Potential resource competition between an invasive mammal and native birds: overlap in tree cavity preferences of feral raccoons and Ural owls. Biological Invasions, 16, 1453-1464.
北海道テレビ（HBC）など多くのメディアで取り上げて頂きました！
Hashimoto S., Koizumi I.*, Takai K. and Higashi S. (2014) Different habitat salinity between two divergent groups of a worm-like goby Luciogobius guttatus: an indication of cryptic species. Environmental Biology of Fishes, 97, 1169-1177.
Kitano S., Ohdachi S., Koizumi I. and Hasegawa K. (2014) Hybridization between native white-spotted charr and nonnative brook trout in the upper Sorachi River, Hokkaido, Japan. Ichthyological Research, 61, 1-8.
Soga M., Ishiyama N., Sueyoshi M., Yamaura Y., Hayashida K., Koizumi I., Negishi J.N. (2014) Interaction between patch area and shape: ponds with different formation processes have contrasting area and shape effects on macrophyte diversity. Landscape & Ecological Engineering, 10. 55-64.
坂本洋典・森照貴・小泉逸郎（2014）温泉・地熱地帯は生物多様性のホットスポットか？ 生物科学, 65, 245-255.
2013
Koizumi I., Kanazawa Y. and Tanaka Y. (2013) The fishermen were right: experimental evidence for tributary refuge hypothesis during floods. Zoologocal Science, 30, 375-379.
Zoological Science Award 受賞
．
北海道新聞など多くのメディアで取り上げて頂きました！
池田啓・小泉逸郎（編） （2013）「系統地理学：DNAで解き明かす生きものの自然史」文一総合出版社 pp 314.
小泉逸郎・池田啓（2013）系統地理学の歴史と展望 In：「系統地理学：DNAで解き明かす生きものの自然史」文一総合出版社 pp 7-32
＊系統地理学の分かりやすい解説です。
小泉逸郎（2013） ニホンザリガニのDNAに刻まれた北日本の地史：歴史遺産としての遺伝的多様性 In：「系統地理学：DNAで解き明かす生きものの自然史」文一総合出版社 pp 35-60
＊こちらでプレスリリースした研究のさらに詳しい内容です。
2012
Koizumi I., Usio N., Kawai T., Azuma N. and Masuda R. (2012) Loss of genetic diversity means loss of geological information: the endangered Japanese crayfish possessed remarkable historical footprints. PLoS ONE, 7, e33986.
北海道新聞など多くのメディアで取り上げて頂きました！
Koizumi I., Hasegawa K. and Kishi D. (2012) Do small tributaries function as refuges from floods? A test in a salmonid-dominated mountainous river. Ecology of Freshwater Fish, 21, 165-167.
Kitanishi S., Yamamoto T., Koizumi I., Dunham J. and Higashi S. (2012) Fine scale relationship between sex, life history and dispersal of masu salmon. Ecology and Evolution, 2, 920-929.
Yuta T. and Koizumi I. (2012) Long breeding season and high frequency of multiple brooding in Great Tits in northern Japan. ARDEA, 100, 197-201.
2011
Koizumi I. (2011) Integration of ecology, demography and genetics to reveal population structure and persistence: a mini review and case study of stream-dwelling Dolly Varden. Ecology of Freshwater Fish, 20, 352-363.
＊個体群の空間構造のレビューと自分の過去10年間の研究のまとめです。
Azuma N., Usio N., Korenaga T., Koizumi I., and Takamura N. (2011) Genetic population structure of the invasive signal crayfish Pacifastacus leniusculus in Japan inferred from newly developed microsatellite markers. Plankton & Benthos Research, 6, 179-186
2009
Griffiths A.M., Koizumi I., Bright D. and Stevens J. (2009) A case of isolation by distance and short-term temporal stability of population structure in brown trout (Salmo trutta) within the River Dart, southwest England. Evolutionary Applications, 2, 537-554.
Raeymaekers J.A.M., Raeymaekers D., Koizumi I., Geldof S. and Volckaert F.A.M. (2009) Guidelines for restoring connectivity around water mills: a population genetic approach to the management of riverine fish. Journal of Applied Ecology, 46, 562-571.
2008
Dunham J.B., Baxter C., Fausch K.D., Fredenberg W., Kitano S., Koizumi I., Morita K., Nakamura T., Rieman B.E., Savviatova A., Stanford J., Taylor E.B. and Yamamoto S. (2008) Ecology and conservation of Dolly Varden, white-spotted char and bull trout. Fisheries, 33, 537-550.
＊環太平洋イワナ研究者によるワークショップのまとめです。
Koizumi I., Yamamoto S., Nomoto K. and Maekawa K. (2008) Synchrony in local population dynamics of stream-dwelling Dolly Varden: do genetically similar groups show similar demography? Population Ecology, 50, 367-377.
Satake A. and Koizumi I. (2008) Preface in the special feature: Population synchrony in ecological systems. Population Ecology, 50, 325-327.
2007
小泉逸郎 （2007） 文化の違いが生み出す研究スタイルの違い：短時間で高生産、かつリラックスしたフィンランドの研究環境．日本生態学会誌，57，265-269． ぜひ読んでみて下さい！
2006
Koizumi I., Yamamoto S. and Maekawa K. (2006) Decomposed pairwise regression analysis of genetic and geographic distances reveals a metapopulation structure of stream-dwelling Dolly Varden charr. Molecular Ecology, 15, 3175-3189.
Koizumi I., Yamamoto S. and Maekawa K. (2006) Female-biased migration of stream-dwelling Dolly Varden in the Shiisorapuchi River, Hokkaido, Japan. Journal of Fish Biology, 68, 1513-1529.
Yamamoto S., Kitano S., Maekawa K., Koizumi I. and Morita K. (2006) Introgressive hybridization between Dolly Varden Salvelinus malma and white-spotted charr Salvelinus leucomaenis on Hokkaido Island, Japan. Journal of Fish Biology, 68 (Supplement A), 68-85.
Yamamoto S., Maekawa K., Tamate T., Koizumi I., Hasegawa K. and Kubota H. (2006) Genetic evaluation of translocation in artificially isolated populations of white-spotted charr (Salvelinus leucomaenis). Fisheries Research, 78, 352-358.
2005
Koizumi I., Kobayashi H., Maekawa K., Azuma N. and Nagase T. (2005) Hybridization between endemic Miyabe charr (Salvelinus malma miyabei) and introduced masu salmon (Oncorhynchus masou) in Shikaribetsu Lake. Ichthyological Research, 52, 83-85.
小泉逸郎 (2005) 河川性サケ科魚類のメタ個体群動態：個人レベルの大規模長期野外調査．日本生態学会誌，55，337-347． おすすめ！（特に後半）
2004
小泉逸郎・山本祥一郎 （2004） サケ科魚類の遺伝的構造 In：「サケ・マスの生態と進化」（前川光司編）文一総合出版社 pp 243-280.
Koizumi I. and Maekawa K. (2004) Metapopulation structure of stream-dwelling Dolly Varden charr inferred from patterns of occurrence in the Sorachi River basin, Hokkaido, Japan. Freshwater Biology, 49, 973-981.
Yamamoto S., Morita K., Koizumi I. and Maekawa K. (2004) Genetic differentiation of white-spotted charr (Salvelinus leucomaenis) populations after habitat fragmentation: spatio-temporal changes of gene frequencies. Conservation Genetics, 5, 529-538.
Yamamoto S., Morita K., Kitano S., Watanabe K., Koizumi I., Maekawa K. and Takamura K. (2004) Phylogeography of white-spotted charr (Salvelinus leucomaenis) inferred from mitochondrial DNA sequences. Zoological Science, 21, 229-240.
2003
Koizumi I. and Maekawa K. (2003) Spawning migration of stream-dwelling Dolly Varden in spring-fed tributaries of the Shiisorapuchi River, Japan. Journal of Freshwater Ecology, 18, 321-331.
2002
Koseki Y., Koizumi I., Kobayashi H. and Maekawa K. (2002) Does the refuge availability influence the spawning behavior of mature male parr in salmonids? A test in the Miyabe charr. Environmental Biology of Fishes, 64, 87-93.
紀要・その他
小泉逸郎（2014）特集「北海道の生物境界」：ブラキストン戦の生物学的意義．モーリー，34，12-13．
小泉逸郎（2014）NEWSハイライト：アライグマとフクロウが樹洞を取り合う？！自然保護，538，24-25．
Koizumi I. (2006) Metapopulation structure and persistence of stream-dwelling Dolly Varden in the Shiisorapuchi River, Hokkaido, Japan. Journal of Fish Biology 69 (suppl C): 226-227.
Koizumi I. (2006) A “tributary-mainstream” system function like a “river-ocean” system: seasonal migration of stream-dwelling salmonid in a unique river system in central Hokkaido, Japan. In Kovar K., Hrkal Z. & Bruthans J. (eds.), International Conference on Hydrology and Ecology: The Groundwater/Ecology Connection. Proceedings of HydroEco’2006, September 11-14, Karlovy Vary, Czech Republic. 351-354.
学会発表など
書ききれないので最近のものだけ 小泉研公式HPをご覧ください。