Flow intermittency alters longitudinal patterns of invertebrate diversity and assemblage composition in an arid-land stream network

SUMMARY 1. Temporary streams comprise a large proportion of the total length of most stream networks, and the great majority of arid-land stream networks, so it is important to understand their contribution to biotic diversity at both local and landscape scales. 2. In late winter 2010, we sampled invertebrate assemblages in 12 reaches of a large arid-land stream network (including perennial and intermittent headwaters, intermittent middle reaches and perennial rivers) in south-east Arizona, U.S.A. Intermittent reaches had then been flowing for c. 60 days, following a dry period of more than 450 days. We sampled a subset of the perennial study reaches three more times between 2009 and 2011. Since intermittent reaches were dry during these additional sampling periods, we used assemblage data from two other intermittent streams in the study network (sampled in 2004–05 and 2010) to explore interannual variability in intermittent stream assemblage composition. 3. Invertebrate richness was lowest in intermittent reaches, despite their often being connected to species-rich perennial reaches. The assemblages of these intermittent reaches were not simply a subset of the species in perennial streams, but rather were dominated by a suite of stoneflies, blackflies and midges with adaptations to intermittency (e.g. egg and ⁄ or larval diapause). On average, 86% of individuals in these samples were specialists or exclusive to intermittent streams. Predators were 7–14 times more abundant in perennial than in intermittent reaches. 4. Despite being separated by long distances (12–25 km) and having very different physical characteristics, the assemblages of perennial headwaters and rivers were more similar to one another than to intervening intermittent reaches, emphasising the prime importance of local hydrology in this system. 5. The duration and recurrence intervals of dry periods, and the relative importance of dispersal from perennial refuges, probably influence the magnitude of biological differences between neighbouring perennial and temporary streams. Although perennial headwaters supported the highest diversity of invertebrates, intermittent reaches supported a number of unique or locally rare species and as such contribute to regional species diversity and should be included in conservation planning.

[1]  David B. Arscott,et al.  Recent perspectives on temporary river ecology , 2011, Aquatic Sciences.

[2]  D. Janzen,et al.  The Black Flies (Simuliidae) of North America , 2004 .

[3]  T. Hothorn,et al.  Simultaneous Inference in General Parametric Models , 2008, Biometrical journal. Biometrische Zeitschrift.

[4]  N. H. Anderson,et al.  THE LIFE HISTORY OF OSTROCERCA DIMICKI (FRISON) IN A SHORT-FLOW, SUMMER-DRY OREGON STREAM , 2010 .

[5]  W. Fagan,et al.  Living in the branches: population dynamics and ecological processes in dendritic networks. , 2007, Ecology letters.

[6]  R. Stevenson,et al.  Comparison of Macroinvertebrate Diversity and Community Structure among Perennial and Non-Perennial Headwater Streams , 2011 .

[7]  J. Casas,et al.  Changes in chironomid assemblage composition in two Mediterranean mountain streams over a period of extreme hydrological conditions , 1998, Hydrobiologia.

[8]  A. Boulton,et al.  The ecology of two intermittent streams in Victoria, Australia.: III. Temporal changes in faunal composition , 1992 .

[9]  W. Dodds,et al.  Macroinvertebrate assemblage structure across a tallgrass prairie stream landscape , 2002 .

[10]  Colin R. Townsend,et al.  The Patch Dynamics Concept of Stream Community Ecology , 1989, Journal of the North American Benthological Society.

[11]  A. Moldenke,et al.  Insect Production from Temporary and Perennially Flowing Headwater Streams in Western Oregon , 2002 .

[12]  P. White,et al.  The distance decay of similarity in biogeography and ecology , 1999 .

[13]  D. Lytle,et al.  Seasonal flow variation allows 'time-sharing' by disparate aquatic insect communities in montane desert streams , 2007 .

[14]  Poirazidis Konstantinos,et al.  Do intermittent and ephemeral Mediterranean rivers belong to the same river type? , 2009, Aquatic Ecology.

[15]  C. Townsend,et al.  A truce with neutral theory: local deterministic factors, species traits and dispersal limitation together determine patterns of diversity in stream invertebrates. , 2006, The Journal of animal ecology.

[16]  K. Price,et al.  Communities of aquatic insects of old-growth and clearcut coastal headwater streams of varying flow persistence , 2003 .

[17]  Aaron M.Ellison.  PC‐ORD: Multivariate Analysis of Ecological Data , 1998, The Bulletin of the Ecological Society of America.

[18]  G. Jacobi,et al.  Winter Stoneflies (Plecoptera) in Seasonal Habitats in New Mexico, USA , 1996, Journal of the North American Benthological Society.

[19]  Towns.  Limnological characteristics of a South Australian intermittent stream, Brown Hill Creek , 1985 .

[20]  D. Arscott,et al.  A Framework for Analyzing Longitudinal and Temporal Variation in River Flow and Developing Flow‐Ecology Relationships 1 , 2010 .

[21]  Ken M. Fritz,et al.  Resistance and Resilience of Macroinvertebrate Assemblages to Drying and Flood in a Tallgrass Prairie Stream System , 2004, Hydrobiologia.

[22]  D. Williams.  Environmental Constraints in Temporary Fresh Waters and Their Consequences for the Insect Fauna , 1996, Journal of the North American Benthological Society.

[23]  S. Fisher,et al.  Spatial distribution and taxonomic composition of the hyporheos of several Sonoran Desert streams , 1992 .

[24]  D. Arscott,et al.  Aquatic invertebrate community structure along an intermittence gradient: Selwyn River, New Zealand , 2010, Journal of the North American Benthological Society.

[25]  David A. Lytle,et al.  Severe drought drives novel community trajectories in desert stream pools , 2011 .

[26]  L. Ferrington.  Evidence for the hyporheic zone as a microhabitat of Krenosmittia spp. Larvae (Diptera: Chironomidae) , 1984 .

[27]  R Core Team,et al.  R: A language and environment for statistical computing. , 2014 .

[28]  Carla M. Delucchi,et al.  Comparison of community structure among streams with different temporal flow regimes , 1988 .

[29]  Arthur V. Brown,et al.  The Role of Disturbance in Stream Ecology , 1988, Journal of the North American Benthological Society.

[30]  M. Bogan,et al.  Aerial dispersal of aquatic invertebrates along and away from arid-land streams , 2012, Freshwater Science.

[31]  Shin Ta Liu,et al.  Permutation Methods: A Distance Function Approach , 2002, Technometrics.

[32]  N. Prat,et al.  Macroinvertebrate communities of non-glacial high altitude intermittent streams , 2007 .

[33]  E. Stanley,et al.  Invertebrate resistance and resilience to intermittency in a desert stream , 1994 .

[34]  Klement Tockner,et al.  Emerging concepts in temporary‐river ecology , 2010 .

[35]  A. Boulton,et al.  Ecology of Temporary Streams—an Australian Perspective , 1986 .

[36]  C. Humphrey,et al.  Macroinvertebrate recolonization after re-wetting of a tropical seasonally-flowing stream (Magela Creek, Northern Territory, Australia) , 1997 .

[37]  J. McArthur,et al.  Patterns of macroinvertebrate colonization in an intermittent Rocky Mountain stream in Utah , 1985 .

[38]  N. LeRoy Poff,et al.  Landscape Filters and Species Traits: Towards Mechanistic Understanding and Prediction in Stream Ecology , 1997, Journal of the North American Benthological Society.

[39]  A. Herlihy,et al.  Influence of clearcut logging, flow duration, and season on emergent aquatic insects in headwater streams of the Central Oregon Coast Range , 2007, Journal of the North American Benthological Society.

[40]  S. Golladay,et al.  Effects of Spates and Drying on Macroinvertebrate Assemblages of an Intermittent and a Perennial Prairie Stream , 1996, Journal of the North American Benthological Society.

[41]  P. Cranston,et al.  Hydrobaenus saetheri Cranston, new species, an aestivating, winter- emerging chironomid (Diptera: Chironomidae) from California , 2007 .

[42]  S. Wissinger,et al.  Caddisfly life histories along permanence gradients in high‐altitude wetlands in Colorado (U.S.A.) , 2003 .

[43]  Julian D. Olden,et al.  ELECTRICAL RESISTANCE SENSOR ARRAYS AS A MEANS TO QUANTIFY LONGITUDINAL CONNECTIVITY OF RIVERS , 2012 .

[44]  R. Muneepeerakul,et al.  Neutral metacommunity models predict fish diversity patterns in Mississippi–Missouri basin , 2008, Nature.

[45]  S. Grubbs.  Influence of flow permanence on headwater macroinvertebrate communities in a Cumberland Plateau watershed, USA , 2011, Aquatic Ecology.

[46]  G. Minshall,et al.  The River Continuum Concept , 1980 .

[47]  B. McCune,et al.  Analysis of Ecological Communities , 2002 .

[48]  S. Larned,et al.  Invertebrate and microbial responses to inundation in an ephemeral river reach in New Zealand: effects of preceding dry periods , 2007, Aquatic Sciences.

[49]  N. Prat,et al.  Macroinvertebrate community structure and biological traits related to flow permanence in a Mediterranean river network , 2007, Hydrobiologia.

[50]  B. Robson,et al.  Drought refuges, spatial scale and recolonisation by invertebrates in non‐perennial streams , 2011 .

[51]  D. Williams,et al.  The ecology of temporary streams I. The faunas of two Canadian streams , 1976 .

[52]  P. Wood,et al.  Flow permanence and macroinvertebrate community diversity within groundwater dominated headwater streams and springs , 2005, Hydrobiologia.

[53]  Mollie E. Brooks,et al.  Generalized linear mixed models: a practical guide for ecology and evolution. , 2009, Trends in ecology & evolution.

[54]  L. Gray.  Species Composition and Life Histories of Aquatic Insects in a Lowland Sonoran Desert Stream , 1981 .

[55]  P. Legendre,et al.  SPECIES ASSEMBLAGES AND INDICATOR SPECIES:THE NEED FOR A FLEXIBLE ASYMMETRICAL APPROACH , 1997 .

[56]  J. Quinn,et al.  Composition and temporal changes in macroinvertebrate communities of intermittent streams in Hawke's Bay, New Zealand , 2008 .

[57]  J. Feminella,et al.  Comparison of Benthic Macroinvertebrate Assemblages in Small Streams along a Gradient of Flow Permanence , 1996, Journal of the North American Benthological Society.

[58]  T. Datry.  Benthic and hyporheic invertebrate assemblages along a flow intermittence gradient: effects of duration of dry events , 2012 .

[59]  M. A. Churchel,et al.  Recovery of Aquatic Macroinvertebrate Communities from Drought in Georgia Piedmont Headwater Streams , 2006 .

[60]  D. Bates,et al.  Linear Mixed-Effects Models using 'Eigen' and S4 , 2015 .

[61]  P. Mielke,et al.  Permutation Methods: A Distance Function Approach , 2007 .

[62]  K. Maloney,et al.  Distance decay of similarity in temperate aquatic communities: effects of environmental transition zones, distance measure, and life histories , 2011 .