2011
DOI: 10.1890/10-0760.1
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Latitudinal variation in top-down and bottom-up control of a salt marsh food web

Abstract: Abstract. The shrub Iva frutescens, which occupies the terrestrial border of U.S. Atlantic Coast salt marshes, supports a food web that varies strongly across latitude. We tested whether latitudinal variation in plant quality (higher at high latitudes), consumption by omnivores (a crab, present only at low latitudes), consumption by mesopredators (ladybugs, present at all latitudes), or the life history stage of an herbivorous beetle could explain continental-scale field patterns of herbivore density. In a mes… Show more

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Cited by 35 publications
(40 citation statements)
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“…Marine ecologists have provided particularly good characterizations of food webs with studies of, for example, temperate rocky-shore intertidal communities (Paine 1969, Lubchenco 1978, Sousa 1979 and tropical benthic macroalgal communities (Hay 1981, Lewis 1985. Due to the complexity of most ecosystems, however, not only is some combination of top-down and bottom-up processes likely to be important (Hunter & Price 1992, Menge 2000, Ainley & Hyrenbach 2010, Denyer et al 2010), but also the relative importance of these processes may change along with other factors, such as latitude (Marczak et al 2011) or time (Whalen et al 2013).…”
Section: Introductionmentioning
confidence: 99%
“…Marine ecologists have provided particularly good characterizations of food webs with studies of, for example, temperate rocky-shore intertidal communities (Paine 1969, Lubchenco 1978, Sousa 1979 and tropical benthic macroalgal communities (Hay 1981, Lewis 1985. Due to the complexity of most ecosystems, however, not only is some combination of top-down and bottom-up processes likely to be important (Hunter & Price 1992, Menge 2000, Ainley & Hyrenbach 2010, Denyer et al 2010), but also the relative importance of these processes may change along with other factors, such as latitude (Marczak et al 2011) or time (Whalen et al 2013).…”
Section: Introductionmentioning
confidence: 99%
“…Marsh elder ( Iva frutescens, hereafter Iva ) is a shrub found at the terrestrial border of the high marsh. Insect food web modules on Iva have been the focus of a number of previous studies of predator–prey interactions (Hacker & Bertness, 1995; Ho & Pennings, 2008; Marczak et al., 2011). We studied a simple system consisting of the most common herbivore on Iva , the aphid Uroleucon ambrosiae (hereafter Uroleucon ) (Hacker & Bertness, 1995), and its major predator at our study site, the spotless ladybeetle Cycloneda sanguinea (hereafter Cycloneda , Figure 1).…”
Section: Methodsmentioning
confidence: 99%
“…We studied a simple system consisting of the most common herbivore on Iva , the aphid Uroleucon ambrosiae (hereafter Uroleucon ) (Hacker & Bertness, 1995), and its major predator at our study site, the spotless ladybeetle Cycloneda sanguinea (hereafter Cycloneda , Figure 1). Other predators of Uroleucon at this site include other ladybeetles such as Coccinella septempunctata , Harmonia axyridis, and Hippodamia convergens , and an omnivorous crab Armases cinereum (Ho & Pennings, 2008; Marczak et al., 2011; Pennings et al., 2009). …”
Section: Methodsmentioning
confidence: 99%
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“…Most of this work has focused on local and regional scales, with few studies at large geographic (= continental) scales that span large gradients in climate, oceanographic drivers or soil type (but see Blanchette et al 2008;Marczak et al 2011;McCall & Pennings 2012). As a result, we currently have a poor understanding of the extent to which factors mediating variation in community structure at local scales also matter at geographic scales.…”
mentioning
confidence: 99%