温暖化問題のウソ！？ 〜正しい温暖化研究のススメ〜
奥田 昇
近代に始まった全球的な温暖化傾向が人間活動によってもたらされたことは、もはや疑う余地もない。そして、21世紀、我々は人類史上かつてない急速な温度上昇に直面しようとしている。その影響は、人間社会よりも一足早く、温度環境の変化に極めて鋭敏な変温動物である魚類に忍び寄っている。温暖化に伴う水温上昇は、魚類の生息分布域の変化にとどまらず、時として、局所個体群や種の絶滅をも引き起こす危険性を秘めている。しかし、魚類の温暖化影響を警告するエピソードの多くは論争の渦中にあり、その真偽を検証するのに十分な判断材料を我々はまだ持ち合わせていない。とりわけ、温暖化に伴う魚類の個体レベルの応答メカニズムや、温暖化を介した生物間相互作用の変化が魚類の個体群を変動させるプロセスには未解明な部分が多く、野外において魚類の温暖化影響を実証的に示した研究は極めて限られている。そこで、本セミナーでは、魚類の温暖化影響を報告する研究事例を総説し、その方法論上の問題点と今後取り組むべき課題について議論する。最後に、現在、演者が行っている琵琶湖在来魚イサザの温暖化影響に関する研究を紹介する。
引用文献
Aigo, J., Cussac, V., Peris, S., Ortubay, S.,
Gómez, S., López, H., Gross, M., Barriga, J. & Battini, M. 2008.
Distribution of introduced and native fish in Patagonia (Argentina): patterns
and changes in fish assemblages. Reviews
in Fish Biology and Fisheries, 18,
387-408.
Aronson,
R. B., Thatje, S., Clarke, A., Peck, L. S., Blake, D. B., Wilga, C. D. &
Seibel, B. A. 2007. Climate change and invasibility of the Antarctic benthos. The Annual Review of Ecology, Evolution, and
Systematics, 38, 129-154.
Beamish,
R. J., McFarlane, G. A. & Thomson, R. E. 1999. Recent declines in the
recreational catch of coho salmon (Oncorhynchus kisutch) in the Strait of
Georgia are related to climate. Canadian
Journal of Fisheries and Aquatic Sciences, 56, 506-515.
Beaugrand,
G., Brander, K. M., Lindley, J. A., Souissi, S. & Reid, P. C. 2003.
Plankton effect on cod recruitment in the North Sea. Nature, 426, 661-664.
Boisneau,
C., Moatar, F., Bodin, M. & Boisneau, P. 2008. Does global warming impact
on migration patterns and recruitment of Allis shad (Alosa alosa L.) young of the year in the Loire River, France? Hydrobiologia, 602, 179-186.
Brander,
K. M. 2007. Global fish production and climate change. Proceedings of the National Academy of Sciences of USA, 104, 19709-19714.
Buisson,
L., Thuiller, W., Lek, S., Lim, P. & Grenouillet, G. 2008. Climate change
hastens the turnover of stream fish assemblages. Global Change Biology, 14,
2232-2248.
Burgmer,
T., Hillebrand, H. & Pfenninger, M. 2007. Effects of climate-driven
temperature changes on the diversity of freshwater macroinvertebrates. Oecologia, 151, 93-103.
Daszak,
P., Cunningham, A. A. & Hyatt, A. D. 2000. Emerging infectious diseases of
wildlife: threats to biodiversity and human health. Science, 287, 443-449.
Daufresne,
M. & Boët, P. 2007. Climate change impacts on structure and diversity of
fish communities in rivers. Global Change
Biology, 13, 2467-2478.
Daufresne,
M., Roger, M. C., Capra, H. & Lamouroux, N. 2003. Long-term changes within
the invertebrate and fish communities of the Upper Rhône River: effects of
climatic factors. Global Change Biology,
10, 124-140.
De
Stasio, B. T. J., Hill, D. K., Kleinhans, J. M., Nibbelink, N. P. &
Magnuson, J. J. 1996. Potential effects of global climate change on small
north-temperate lakes: Physics, fish, and plankton. Limnology and Oceanography, 41,
1136-1149.
Dembski,
S., Masson, G., Monnier, D., Wagner, P. & Pihan, J. C. 2006. Consequences
of elevated temperatures on life-history traits of an introduced fish,
pumpkinseed Lepomis gibbosus. Journal of
Fish Biology, 69, 331-346.
Dickman,
E. M., Newell, J. M., González, M. J. & Vanni, M. J. 2008. Light,
nutrients, and food-chain length constrain planktonic energy transfer
efficiency across multiple trophic levels. Proceedings
of the National Academy of Sciences of USA, 105, 18408-18412.
Dunson,
W. A. & Travis, J. 1991. The role of abiotic factors in community
organization. The American Naturalist,
138, 1067-1091.
Feuchtmayr,
H., McKee, D., Harvey, I. F., Atkinson, D. & Moss, B. 2007. Response of
macroinvertebrates to warming, nutrient addition and predation in large-scale
mesocosm tanks. Hydrobiologia, 584, 425-432.
Ficke,
A. D., Myrick, C. A. & Hansen, L. J. 2007. Potential impacts of global
climate change on freshwater fisheries. Reviews
in Fish Biology and Fisheries.
Finney,
B. P., Gregory-Eaves, I., Sweetman, J., Douglas, M. S. V. & Smol, J. P.
2000. Impacts of Climatic Change and Fishing on PaciÞc Salmon Abundance Over
the Past 300 Years. Science, 290, 795-799.
Gibson,
R. J. 1978. The behavior of juvenile Atlantic salmon (Salmo salar) and brook trout (Salvelinus
fontinalis) with regard to temperature and to water velocity. Transactions of the American Fisheries
Society, 107, 703-712.
Hall,
S. R., Tessier, A. J., Duffy, M. A., Huebner, M. & Cáceres, C. E. 2006.
Warmer does not have to mean sicker:temperature and predators can jointly drive
timing of epidemics. Ecology, 87, 1684-1695.
Hansson,
L.-A., Annadotter, H., Bergman, E., Hamrin, S. F., Jeppesen, E., Kairesalo, T.,
Luokkanen, E., Nilsson, P.-Ǻ., Søndergaard, M. & Strand, J. 1998.
Biomanipulation as an application of food-chain theory: constraints, synthesis,
and recommendations for temperate lakes. Ecosystems,
1, 558-574.
Harvell,
C. D., Mitchell, C. E., Ward, J. R., Altizer, S., Dobson, A. P., Ostfeld, R. S.
& Samuel, M. D. 2002. Climate warming and disease risks for terrestrial and
marine biota. Science, 296, 2158-2162.
Havel, J. E., Lee, C. E. & Vander Zanden, M. J. 2005.
Do
reservoirs facilitate invasions into landscapes? BioScience, 55, 518-525.
Helland,
I. P., Freyhof, J., Kasprzak, P. & Mehner, T. 2007. Temperature sensitivity
of vertical distributions of zooplankton and planktivorous fish in a stratified
lake. Oecologia, 151, 322-330.
Hickling,
R.Roy, D. B., Hill, J. K., Fox, R. & Thomas, C. D. 2006. The distributions
of a wide range of taxonomic groups are expanding polewards. Global Change Biology, 12, 450-455.
Jansen,
W. & Hesslein, R. H. 2004. Potential effects of climate warming on fish
habitats in temperate zone lakes with special reference to Lake 239 of the
experimental lakes area (ELA), north-western Ontario. Environmental Biology of Fishes, 70, 1-22.
Jeppesen,
E., Søndergaard, M., Jensen, J. P., Havens, K. E., Anneville, O., Carvalho, L.,
Coveney, M. F., Deneke, R., Dokulil, M. T., Foy, B., Gerdeaux, D., Hampton, S.
E., Hilt, S., Kangur, K., Köhler, J., Lammens, E. H. H. R., Lauridsen, T. L., Manca,
M., Miracle, M. R., Moss, B., Nõges, P., Persson, G., Phillips, G., Portielje,
R., Romo, S., Schelske, C. L., Straile, D., Tatrai, I., Willén, E. & Winder,
M. 2005. Lake responses to reduced nutrient loading – an analysis of
contemporary long-term data from 35 case studies. Freshwater Biology, 50,
1747-1771.
Jeppesen,
E., Søndergaard, M., Meerhoff, M., Lauridsen, T. L. & Jensen, J. P. 2007.
Shallow lake restoration by nutrient loading reduction—some recent findings and
challenges ahead. Hydrobiologia, 584, 239-252.
Jones,
M. L., Shuter, B. J., Zhao, Y. & Stockwell, J. D. 2006. Forecasting effects
of climate change on Great Lakes fisheries: models that link habitat supply to
population dynamics can help. Canadian
Journal of Fisheries and Aquatic Sciences, 63, 457-468.
Lehtonen,
H. 1996. Potential effects of global warming on northern European freshwater
fish and fisheries. Fisheries Management
and Ecology, 3, 59-71.
Lutterschmidt, W. I., Schaefer, J. F. & Fiorillo, R.
A. 2007. The
ecological significance of helminth endoparasites on the physiological
performance of two sympatric fishes. Comparative
Parasitology, 74, 194-203.
Mackenzie-Grieve,
J. L. & Post, J. R. 2006. Projected impacts of climate warming on
production of lake trout (Salvelinus
namaycush) in southern Yukon lakes. Canadian
Journal of Fisheries and Aquatic Sciences, 63, 788-797.
Magnuson,
J. J., Crowder, L. B. & Medvick, P. A. 1979. Temperature as an ecological
resource. american Zoologist, 19, 331-343.
Mandrak,
N. E. 1989. Potential invasion of
the Great Lakes by fish species associated with climatic warming. Journal of Great Lakes Research, 15, 306-316.
Marcogliese,
D. J. 2001. Implications of climate change for parasitism of animals in the
aquatic environment. Canadian Journal of
Zoology, 79, 1331-1352.
Marcogliese,
D. J. 2008. The impact of climate change on the parasites and infectious
diseases of aquatic animals. Revue
Scientifique et Technique, Office International des Epizooties, 27, 467-484.
Massol,
F., David, P., Gerdeaux, D. & Jarne, P. 2007. The influence of trophic
status and large-scale climatic change on the structure of fish communities in
Perialpine lakes. Journal of Animal
Ecology, 76, 538-551.
McGowan,
J. A., Cayan, D. R. & Dorman, L. M. 1998. Climate-ocean variability and
ecosystem response in the Northeast Pacific. Science, 281, 210-217.
Meerhoff,
M., Clemente, J. M., DeMello, F. T., Esias, C., Pedersen, A. R. & Jeppesen,
E. 2007. Can warm climate-related structure of littoral predator assemblies
weaken the clear water state in shallow lakes? Global Change Biology, 13,
1888-1897.
Mills,
E. L., Casselman, J. M., Dermott, R., Fitzsimons, J. D., Gal, G., Holeck, K.
T., Hoyle, J. A., Johannsson, O. E., Lantry, B. F., Makarewicz, J. C., Millard,
E. S., Munawar, I. F., Munawar, M., O'Gorman, R., Owens, R. W., Rudstam, L. G.,
Schaner, T. & Stewart, T. J. 2003. Lake Ontario: food web dynamics in a
changing ecosystem (1970-2000). Canadian
Journal of Fisheries and Aquatic Sciences, 60, 471-490.
Mills,
M. D., Rader, R. B. & Belk, M. C. 2004. Complex interactions between native
and invasive fish: the simultaneous effects of multiple negative interactions. Oecologia, 141, 713-721.
Mohseni,
O., Stefan, H. G. & Eaton, J. G. 2003. Global warming and potential changes
in fish habitat in U.S. streams. Climatic
Change, 59, 389-409.
Mooij,
W. M., De Senerpont Domis, L. N. & Hülsmann, S. 2008. The impact of climate
warming on water temperature, timing of hatching and young-of-the-year growth
of fish in shallow lakes in the Netherlands. Journal of Sea Research, 60,
32-43.
Moyle,
P. B. & marchetti, M. P. 2006. Predicting invasion success: freshwater
fishes in California as a model. BioScience,
56, 515-524.
Nakano,
S., kitano, F. & Maekawa, K. 1996. Potential fragmentation and loss of
thermal habitats for charrs in the Japanese archipelago due to climatic
warming. Freshwater Biology, 36, 711-722.
O'Reilly,
C. M., Alln, S. R., Plisnier, P.-D., Cohen, A. S. & McKee, B. A. 2003.
Climate change decreases aquatic ecosystem productivity of Lake Tanganyika,
Africa. Nature, 424, 766-768.
Olden, J. D., poff, N. L. & bestgen, K. R. 2006. Life-history
strategies predict fish invasions and extirpations in the colorado river basin.
Ecological Monographs, 76, 25-40.
Perry,
A. L., Low, P. J., Ellis, J. R. & Reynolds, J. D. 2005. Climate change and
distribution shifts in marine fishes. Science,
308, 1912-1915.
Petchey,
O. L., McPhearson, P. T., Casey, T. M. & Morin, P. J. 1999. Environmental
warming alters food-web structure and ecosystem function. Nature (London), 402,
69-72.
Petersen,
J. H. & Kitchell, J. F. 2001. Climate regimes and water temperature changes
in the Columbia River: bioenergetic implications for predators of juvenile
salmon. Canadian Journal of Fisheries and
Aquatic Sciences, 58, 1831-1841.
Peterson,
M. S., Slack, W. T. & Woodley, C. M. 2005. The occurrence of non-indigenous
Nile tilapia, Oreochromis niloticus (Linnaeus)
in coastal mississippi, USA: ties to aquaculture and thermal effluent. Wetlands, 25, 112-121.
Pörtner,
H. O. & Knust, R. 2007. Climate change affects marine fishes through the
oxygen limitation of thermal tolerance. Science,
315, 95-97.
Poulin,
R. 2006. Global warming and temperature-mediated increases in cercarial
emergence in trematode parasites. Parasitology,
132, 143-151.
Pounds,
A. J., Bustamante, M. R., Coloma, L. A., Consuegra, J. A., Fogden, M. P. L.,
Foster, P. N., Marca, E. L., Masters, K. L., Merino-Viteri, A., Puschendorf,
R., Ron, S. R., Sánchez-Azofeifa, G. A., Still, C. J. & Young, B. E. 2006.
Widespread amphibian extinctions from epidemic disease driven by global
warming. Nature (London), 439, 161-167.
Rahel,
F. J. 2007. Biogeographic barriers, connectivity and homogenization of
freshwater faunas: it’s a small world after all. Freshwater Biology, 52,
696-710.
Rahel, F. J. & olden, J. D. 2008. Assessing the
effects of climate change on aquatic invasive species. Conservation Biology, 22,
521-533.
Reeves,
G. H., Everest, F. H. & Hall, J. D. 1987. Interactions between the redside
shiner (Richardsonius balteatus) and
the steelhead trout (Salmo gairdneri)
in western Oregon: the influence of water temperature. Canadian Journal of Fisheries and Aquatic Sciences, 44, 1603-1613.
Root,
T. L., Price, J. T., Hall, K. R., Schneider, S. H., Rosenzweig, C. &
Pounds, J. A. 2003. Fingerprints of global warming on wild animals and plants. Nature, 421, 57-60.
Schindler,
D. E., Carpenter, S. R., Cole, J. J., Kitchell, J. F. & Pace, M. L. 1997.
Influence of food web structure on carbon exchange between lakes and the
atmosphere. Science, 277, 248-251.
Schindler,
D. E., Rogers, d. E., Scheuerell, M. D. & Abrey, C. A. 2005. Effects of
changing climate on zooplankton and juvenile sockeye salmon growth in
southwestern Alaska. Ecology, 86, 198-209.
SHARMA,
S., JACKSON, D. A., MINNS, C. K. & SHUTER, B. J. 2007. Will northern fish
populations be in hot water because of climate change? Global Change Biology, 13,
2052-2064.
Stefan,
H. G., Fang, X. & Eaton, J. G. 2001. Simulated fish habitat changes in
North American lakes in response to projected climate warming. Transactions of the American Fisheries
Society, 130, 459-477.
Taniguchi,
Y. & NAKANO, S. 2000. Condition-specific competition: implications for the
altitudinal distribution of stream fishes. Ecology,
81, 2027-2039.
Thomas,
C. D., Cameron, A., Green, R. E., Bakkenes, M., Beaumont, L. J., Collingham, Y.
C., Erasmus, B. F. N., Ferreira de Siqueira, M., Grainger, A., Hannah, L.,
Hughes, L., Huntley, B., van Jaarsveld, A. S., Midgley, G. F., Miles, L.,
Ortega-Huerta, M. A., Peterson, A. T., Phillips, O. L. & Williams, S. E.
2004. Extinction risk from climate change. Nature
(London), 427, 145-148.
Walther,
G.-R., Post, E., Convey, P., Menzel, A., Parmesank, C., Beebee, T. J. C.,
Fromentin, J.-M., Hoegh-Guldberg, O. & Bairlein, F. 2002. Ecological
responses to recent climate change. Nature
(London), 416, 389-395.
Yamanaka,
H., Kohmatsu, Y. & Yuma, M. 2007. Difference in the hypoxia tolerance of
the round crucian carp and largemouth bass:implications for physiological
refugia in the macrophyte zone. Ichthyological
Research, 54, 308-312.