Spatial structure of large-river fish populations across main-stem and tributary habitats

2018 ◽  
Vol 34 (7) ◽  
pp. 807-815 ◽  
Author(s):  
J.J. Spurgeon ◽  
M.A. Pegg ◽  
M.J. Hamel ◽  
K.D. Steffensen
Keyword(s):  
Spatial Structure ◽  
Large River ◽  
Main Stem ◽  
Fish Populations ◽  
River Fish

Assessing power of large river fish monitoring programs to detect population changes: the Missouri river sturgeon example

2011 ◽  
Vol 27 (2) ◽  
pp. 282-290 ◽  
Author(s):  
M. L. Wildhaber ◽  
S. H. Holan ◽  
J. L. Bryan ◽  
D. W. Gladish ◽  
M. Ellersieck
Keyword(s):  
Missouri River ◽  
Large River ◽  
Population Changes ◽  
Monitoring Programs ◽  
Fish Monitoring ◽  
River Fish

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Native Species ◽  
Fish Assemblages ◽  
Fish Fauna ◽  
River System ◽  
Endangered Species Act ◽  
Large River ◽  
Main Stem ◽  
Lake Mead ◽  
Virgin River ◽  
Native Fishes

<em>Abstract.</em>—The Virgin–Moapa River system supports nine native fish species or subspecies, of which five are endemic. Woundfin <em>Plagopterus argentissimus </em>and Virgin River chub <em>Gila seminuda </em>are endemic to the main-stem Virgin River, whereas cooler and clearer tributaries are home to the Virgin spinedace <em>Lepidomeda mollispinis</em>. Moapa dace <em>Moapa coriacea </em>and Moapa White River springfish <em>Crenichthys baileyi moapae </em>are found in thermal springs that form the Moapa River, and Moapa speckled dace <em>Rhinichthys osculus moapae </em>is generally found below the springs in cooler waters. The agricultural heritage of the Virgin–Moapa River system resulted in numerous diversions that increased as municipal demands rose in recent years. In the early 1900s, trout were introduced into some of the cooler tributary streams, adversely affecting Virgin spinedace and other native species. The creation of Lake Mead in 1935 inundated the lower 80 km of the Virgin River and the lower 8 km of the Moapa River. Shortly thereafter, nonnative fishes invaded upstream from Lake Mead, and these species have continued to proliferate. Growing communities continue to compete for Virgin River water. These anthropogenic changes have reduced distribution and abundance of the native Virgin–Moapa River system fish fauna. The woundfin, Virgin River chub, and Moapa dace are listed as endangered, and the Virgin spinedace has been proposed for listing. In this paper we document how the abundance of these species has declined since the Endangered Species Act of 1973. Currently, there is no strong main-stem refugium for the Virgin River native fishes, tributary refugia continue to be shortened, and the Moapa River native fishes continue to be jeopardized. Recovery efforts for the listed and other native fishes, especially in the Virgin River, have monitored the declines, but have not implemented recovery actions effective in reversing them.

Dispersal traits as benthic invertebrate assemblage drivers in a neotropical large river

2020 ◽  
Vol 193 (3) ◽  
pp. 275-283
Author(s):  
Miguel Saigo ◽  
Mercedes Marchese ◽  
Luciana Montalto
Keyword(s):  
Spatial Structure ◽  
Environmental Conditions ◽  
Distribution Patterns ◽  
Benthic Invertebrate ◽  
Large River ◽  
Species Dispersal ◽  
Dispersal Traits ◽  
Metacommunity Dynamics ◽  
Invertebrate Assemblage

Metacommunity theory is a mechanistic framework that explains the interdependence of local factors and regional processes as community drivers. Recent evidence suggests that dispersal mode is a key trait that potentially affects metacommunity dynamics. We analyzed the distribution patterns of benthic macroinvertebrates with different dispersal modes in the Middle Paraná, a neotropical large river. We assessed the relative importance of local environmental conditions and regional spatial structure as assemblage drivers. Aquatic and aerial dispersers presented Clementsian and Gleasonian structures, respectively. For both groups, local environmental conditions influenced community assembly, and spatial structure (overland distances) also affected the distribution of aerial dispersers. Our study highlights that the role of spatial structure as a driver of benthic metacommunities depends on species' dispersal modes. Aerial dispersers responded to regional spatial variables and it is likely that these organisms are also influenced by mass effects. Our results are consistent with current ideas of metacommunity dynamics in large rivers, where dispersal is not considered to limit the distribution of benthic organisms.

Altered body size distributions in a large river fish community enriched by sewage

2002 ◽  
Vol 59 (5) ◽  
pp. 819-828 ◽  
Author(s):  
Adrian M.H deBruyn ◽  
David J Marcogliese ◽  
Joseph B Rasmussen
Keyword(s):  
Body Size ◽  
Upper Bound ◽  
Fish Community ◽  
Local Variation ◽  
Large River ◽  
Habitat Characteristics ◽  
Size Distributions ◽  
Treated Sewage ◽  
Energetic Constraints ◽  
River Fish

We used two approaches (interspecific upper bound and normalized biomass spectrum, NBS) to study size distributions in a littoral fish community across a natural gradient of epiphytic primary production and at sites enriched by primary-treated sewage. The upper bound of the interspecific density – body size relationship supported universal energetic constraints on the regional assemblage but revealed substantial variation in size distributions at a local scale. Multivariate analysis of the modes composing the NBS suggested possible mechanisms for this local variation in size distributions. Only the largest organisms had higher densities at higher levels of productivity. Densities of smaller organisms could be explained by a combination of habitat characteristics and feeding interactions.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
New Mexico ◽  
Native Species ◽  
Colorado River ◽  
Fish Assemblages ◽  
Large River ◽  
Main Stem ◽  
Past Century ◽  
The West ◽  
Gila River ◽  
Nonnative Fish

<em>Abstract.</em>—The Gila River originates in southwestern New Mexico and courses its way for over 700 km to the west before emptying into the main-stem Colorado River near Yuma, Arizona. Historically, this river was a major watercourse across the Sonora Desert of Arizona. At present, main-stem dams and numerous diversions have markedly altered the historic hydrology of the river. Seventeen native species once occupied the main stem of this large southwest desert river. More than twice that number (40) of nonnative fish species have been introduced into the waters of the Gila over the past century. Currently, less than half of the native fauna is present in the main stem and then primarily in the upper three reaches of the river. The majority of the species (70%) are federally listed as threatened, endangered, or sensitive. The combination of hydrological alteration and accompanying introductions of nonnative, principally sport fishes has basically extirpated the native fauna in all but the uppermost reaches of the Gila River main stem.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
River Management ◽  
Large River ◽  
Large Rivers ◽  
Pertinent Literature ◽  
Historical Changes ◽  
Time To Learn ◽  
River Fish

<em>Abstract.</em>—This book’s objective is to document historical changes in the fish assemblages of large American rivers, and to determine patterns in and rationale for those changes. In this chapter, we review pertinent literature on large rivers and fish assemblages worldwide and briefly introduce the chapters. We expect that the information contained in this book will aid river management in general, and stimulate similar historical fish assemblage studies elsewhere. There will never be a better time to learn and understand what has been changed and to reverse or slow undesirable changes.

scholarly journals Shift in a Large River Fish Assemblage: Body-Size and Trophic Structure Dynamics

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0124954 ◽  
Author(s):  
Kyle J. Broadway ◽  
Mark Pyron ◽  
James R. Gammon ◽  
Brent A. Murry
Keyword(s):  
Body Size ◽  
Fish Assemblage ◽  
Trophic Structure ◽  
Large River ◽  
Structure Dynamics ◽  
River Fish
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