LOCAL AND REGIONAL ZOOPLANKTON SPECIES RICHNESS: A SCALE‐INDEPENDENT TEST FOR SATURATION

Assemblages of coexisting species are formed by immigration from a re- gional pool of colonists and local interactions among species and with the physical envi- ronment. Theory suggests that the shape of the relationship between regional and local species richness may indicate the relative roles of dispersal and local interactions in limiting local diversity. Here we examine patterns of regional and local species richness in freshwater crustacean zooplankton to test whether linear (suggesting dispersal limitation) or curvilinear (suggesting saturation, via strong local control) functions best fit the data. Local richness appeared saturated when regions of different spatial extents were included on the same graph. However, this pattern was influenced by differences in scale among surveys. We corrected for the effects of regional scale by plotting mean local richness against the residuals of the species-landscape area relations. Controlling for the extent of the regional scale produced much more linear patterns, suggesting strong dispersal limitation. We present a simple graphical model to explain how variation among surveys in the geographic size of regions can produce apparent saturation of local diversity even if the underlying pattern of local and regional richness is linear. We also compare the predictive power of residual regional richness on local richness with that of several local features in a multiple regression model. Local richness exhibits strong relationships with both residual regional richness and pH. We argue that the relative strengths of local and regional processes depend on the definition of the regional scale. A variety of evidence suggests that local processes play a major role in generating differences in zooplankton diversity among lakes within a bio- geographic region. Evidence for the importance of dispersal limitation comes largely from comparisons of lakes across very large scales. Our analysis suggests that linear patterns of local and regional diversity are not incompatible with strong local interactions.

[1]  J. Shurin.  DISPERSAL LIMITATION, INVASION RESISTANCE, AND THE STRUCTURE OF POND ZOOPLANKTON COMMUNITIES , 2000 .

[2]  M. Leibold,et al.  A FUNDAMENTAL TRADE‐OFF IN RESOURCE EXPLOITATION BY DAPHNIA AND CONSEQUENCES TO PLANKTON COMMUNITIES , 2000 .

[3]  Michael A. Huston,et al.  Local processes and regional patterns : appropriate scales for understanding variation in the diversity of plants and animals , 1999 .

[4]  Yolanda Lukaszewski.  Regional versus local processes in determining zooplankton community composition of little Rock Lake, Wisconsin, USA , 1999 .

[5]  H. Cornell,et al.  11. Local and Regional Processes as Controls of Species Richness , 1998 .

[6]  A. L. Buikema,et al.  Do similar communities develop in similar sites? A test with zooplankton structure and function , 1998 .

[7]  J. Magnuson,et al.  Crustacean zooplankton species richness: single- and multiple-year estimates , 1998 .

[8]  D. Schluter,et al.  THE RELATIONSHIP BETWEEN LOCAL AND REGIONAL DIVERSITY: REPLY , 1998 .

[9]  M. Westoby.  THE RELATIONSHIP BETWEEN LOCAL AND REGIONAL DIVERSITY:COMMENT , 1998 .

[10]  H. Cornell,et al.  Scale-dependent variation in local vs. regional effects on coral species richness , 1998 .

[11]  P. Angermeier,et al.  Local vs. regional influences on local diversity in stream fish communities of Virginia , 1998 .

[12]  R. S. Stemberger.  Pleistocene refuge areas and postglacial dispersal of copepods of the northeastern United States , 1995 .

[13]  Mark V. Lomolino,et al.  Species Diversity in Space and Time. , 1996 .

[14]  W. Keller,et al.  Crustacean Zooplankton Communities and Lake Morphometry in Precambrian Shield Lakes , 1994 .

[15]  S. Carpenter,et al.  The Trophic Cascade in Lakes , 1994 .

[16]  A. Mazumder,et al.  Patterns of Algal Biomass in Dominant Odd‐ vs. Even‐Link Lake Ecosystems , 1994 .

[17]  A. Salki,et al.  Spatial Variation of Crustacean Plankton in Lakes of Different Size , 1993 .

[18]  P. Hebert,et al.  Daphnia lumholtzi in North America: Another exotic zooplankter , 1993 .

[19]  J. A. Perry,et al.  Experimental acidification of Little Rock Lake, Wisconsin : chemical and biological changes over the pH range 6.1 to 4.7 , 1993 .

[20]  S. Dodson.  Predicting crustacean zooplankton species richness , 1992 .

[21]  J. Lawton,et al.  Species interactions, local and regional processes, and limits to the richness of ecological communities : a theoretical perspective , 1992 .

[22]  P. Hebert,et al.  Non‐equilibrium gene frequency divergence: persistent founder effects in natural populations , 1992 .

[23]  P. Hebert,et al.  GENETIC CONSEQUENCES OF PASSIVE DISPERSAL IN POND‐DWELLING COPEPODS , 1991, Evolution; international journal of organic evolution.

[24]  K. Patalas.  Diversity of the zooplankton communities in Canadian lakes as a function of climate , 1990 .

[25]  R. Horwitz,et al.  Influence of Water Chemistry on Size Structure of Zooplankton Assemblages , 1990 .

[26]  J. Pitblado,et al.  The distribution of crustacean zooplankton in northern Ontario, Canada , 1989 .

[27]  J. C. Carter,et al.  Diel Vertical Migrations and Horizontal Distributions of Limnocalanus macrurus and Senecella calanoides (Copepoda, Calanoida) in Lakes of Southern Ontario in Relation to Planktivorous Fish , 1986 .

[28]  P. Hebert,et al.  Patterns in the Composition of Arctic Tundra Pond Microcrustacean Communities , 1986 .

[29]  W. Taylor,et al.  Limnetic Zooplankton Assemblages in Atlantic Canada with Special Reference to Acidification , 1986 .

[30]  J. Pitblado,et al.  Crustacean plankton in northeastern Ontario lakes subjected to acidic deposition , 1984 .

[31]  J. Terborgh,et al.  Saturation of Bird Communities in the West Indies , 1980, The American Naturalist.

[32]  W. G. Sprules,et al.  Distribution and zoogeography of planktonic crustaceans and dipterans in glaciated eastern North America , 1980 .

[33]  W. G. Sprules.  Factors affecting the structure of limnetic crustacean zooplankton communities in central Ontario lakes: With 3 figures and 5 tables in the text , 1975 .

[34]  Michael C. LaBarhera,et al.  The chemical ecology of copepod distribution in the lakes of East and Central Africa1 , 1974 .

[35]  K. Patalas.  Crustacean Plankton Communities in Forty-Five Lakes in the Experimental Lakes Area, Northwestern Ontario , 1971 .

[36]  G. E. Hutchinson,et al.  A Treatise on Limnology Vol. II: Introduction to Lake Biology and the Limnoplankton , 1967 .

[37]  S. Dodson,et al.  Predation, Body Size, and Composition of Plankton. , 1965, Science.

[38]  E. Reed.  Records of freshwater Crustacea from Arctic and Subarctic Canada , 1964 .

[39]  K. Patalas.  The crustacean plankton communities in 52 lakes of different altitudinal zones of Northern Colorado: With 9 figures and 2 tables in the text and on 3 folders , 1964 .

[40]  D. Srivastava.  Using local–regional richness plots to test for species saturation: pitfalls and potentials , 1999 .

[41]  M. Leibold.  Biodiversity and nutrient enrichment in pond plankton communities , 1999 .

[42]  D. Schluter,et al.  THE RELATIONSHIP BETWEEN LOCAL AND REGIONAL DIVERSITY , 1997 .

[43]  L. Meester.  Local genetic differentiation and adaptation in freshwater zooplankton populations: Patterns and processes , 1996 .

[44]  Theophile Niyonsenga,et al.  Spatial and environmental components of freshwater zooplankton structure , 1995 .

[45]  John R. Jones,et al.  Invasion of the exotic cladoceran Daphnia lumholtzi into North American reservoirs , 1995 .

[46]  A. Young,et al.  Population dynamics and body‐size selection in Daphnia , 1992 .

[47]  J. Bengtsson.  Interspecific competition in metapopulations , 1991 .

[48]  G. Méthot,et al.  Zooplankton species associations in Quebec lakes: variation with abiotic factors, including natural and anthropogenic acidification , 1990 .

[49]  Ulrich Sommer,et al.  Plankton ecology, succession in plankton communities , 1989 .

[50]  M. Meijering,et al.  On the limnology of Bear Island (74°30'N, 19° E) with special reference to Cladocera , 1978 .

[51]  U. Røen.  Localities, ecology, and geographical distribution of the species , 1962 .

[52]  W. Rodhe.  The ionic composition of lake waters: With 21 figures and 2 tables in the text , 1948 .