Mosquitofish predation and aquatic vegetation determine emergence patterns of dragonfly assemblages

Knorp, Natalie E.; Dorn, Nathan J.

doi:10.1086/684678

Cited by 17 publications

(11 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…, Preston et al. ) and invertebrates (Knorp and Dorn ). As a result, it may be difficult to generalize mosquitofish impacts across discrete wetlands that vary in environmental conditions and community structure.…”

Section: Discussionmentioning

confidence: 99%

“…We also note, however, that the predatory effects of mosquitofish on amphibians and invertebrates may be context-dependent. Increases in habitat complexity and the availability of alternative prey can weaken the predatory effects of mosquitofish on some amphibian species (Lawler et al 1999, Preston et al 2017) and invertebrates (Knorp and Dorn 2016). As a result, it may be difficult to generalize mosquitofish impacts across discrete wetlands that vary in environmental conditions and community structure.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Nutrient availability and invasive fish jointly drive community dynamics in an experimental aquatic system

2018

View full text Add to dashboard Cite

Species invasions increasingly occur alongside other forms of ecosystem change, highlighting the need to understand how invasion outcomes are influenced by environmental factors. Within freshwaters, two of the most widespread drivers of change are introduced fishes and nutrient loading, yet it remains difficult to predict how interactions between these drivers affect invasion success and consequences for native communities. To test competing theories about interactions between nutrients and invasions, we conducted a 2 × 3 factorial mesocosm experiment, varying western mosquitofish (Gambusia affinis) presence and nutrient availability within aquatic communities. Based on theory, increased nutrients could either (1) facilitate coexistence between predatory mosquitofish and native species by increasing prey availability (the invader attenuation hypothesis) or (2) strengthen predation effects by enhancing fish productivity more than native community members (the invader amplification hypothesis). In outdoor mesocosms designed to mimic observed nutrient conditions and local community structure, mosquitofish directly reduced the abundances of zooplankton and three native amphibian species, leading to indirect increases in phytoplankton, periphyton, and freshwater snail biomass through trophic cascades. Nutrient additions increased native amphibian growth but had especially pronounced effects on the productivity of invasive mosquitofish. The elevated nutrient condition supported ~5 times more juvenile mosquitofish and 30% higher biomass than the low nutrient condition. Increased nutrients levels did not weaken the top‐down effects of mosquitofish on invertebrates or amphibians. Collectively, our results support the invader amplification hypothesis, suggesting that increased nutrient loading may benefit invasive species without attenuating their undesirable effects on native community members.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Nutrient availability and invasive fish jointly drive community dynamics in an experimental aquatic system

2018

View full text Add to dashboard Cite

show abstract

“…The management of recreational fisheries can affect aquatic and riparian biodiversity through various pathways: (i) through supporting and enhancing fish stocks that exert predation pressure (e.g. on tadpoles and Odonata larvae; Hecnar & M'Closkey, 1997; Knorp & Dorn, 2016); (ii) through indirect fish‐based effects (e.g. uprooting macrophytes through benthivorous feeding; Bajer et al , 2016); (iii) through the direct removal or damage of submerged and terrestrial plants during angling activities (O'Toole et al , 2009), which may have knock‐on effects on dragonflies (Müller et al , 2003); and (iv) through activity‐based disturbance effects or lethal impacts through lost fishing sinkers, in particular for birds (Cryer et al , 1987; Sears, 1988).…”

Section: Discussionmentioning

confidence: 99%

“…by the introduction of benthivorous fish that uproot macrophytes; Bajer et al , 2016) and other taxa (e.g. birds, Cucherousset et al , 2012; amphibians, Hecnar & M'Closkey, 1997; or invertebrates, Knorp & Dorn, 2016), through predation. In addition, anglers may modify littoral habitats to create access to angling sites, thereby affecting the species richness of plants (O'Toole, Hanson, & Cooke, 2009) and dragonflies (Müller et al , 2003), or affecting mobile taxa, such as birds, through direct contact and disturbances (Bell, Delany, Millett, & Pollitt, 1997; Cryer, Linley, Ward, Stratford, & Randerson, 1987).…”

Section: Introductionmentioning

confidence: 99%

Status of aquatic and riparian biodiversity in artificial lake ecosystems with and without management for recreational fisheries: Implications for conservation

Nikolaus

Schafft

Maday

et al. 2020

Aquatic Conservation

View full text Add to dashboard Cite

Humanity is facing a biodiversity crisis, with freshwater‐associated biodiversity in a particularly dire state. Novel ecosystems created through human use of mineral resources, such as gravel pit lakes, can provide substitute habitats for the conservation of freshwater and riparian biodiversity. Many of these artificial ecosystems are subject to a high intensity of recreational use, however, which may limit their biodiversity potential. The species richness of several taxa (plants, amphibians, dragonflies, damselflies, waterfowl, and songbirds) was assessed and a range of taxonomic biodiversity metrics were compared between gravel pit lakes managed for recreational fisheries (n = 16) and unmanaged reference lakes (n = 10), controlling for non‐fishing‐related environmental variation. The average species richness of all the taxa examined was similar among lakes in both lake types and no substantial differences in species composition were found when examining the pooled species inventory. Similarly, there were no differences between lake types in the presence of rare species and in the Simpson diversity index across all of the taxa assessed. Variation in species richness among lakes was correlated with woody habitat, lake morphology (surface area and steepness), and land use, but was not correlated with the presence of recreational fisheries. Thus, non‐fishing‐related environmental variables had stronger effects on local species presence than recreational fisheries management or the presence of recreational anglers. Collectively, no evidence was found that anglers and recreational fisheries management constrain the development of aquatic and riparian biodiversity in gravel pit lakes in the study region; however, the conservation of species diversity in gravel pit lakes could benefit from an increasing reliance on habitat enhancement activities.

show abstract

“…All rights reserved Author Manuscript preferentially feed on larger final instar insects just before or during the process of emergence (Tweedy et al, 2013). Further, bottom substrata provide cover for immature stages that can ameliorate predation, whereas some insects move through the open water column to emerge, which may increase chances of being consumed (Diehl, 1992;Knorp & Dorn, 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of fishes on macroinvertebrate communities and insect emergence production in intermittent stream refuges

2020

View full text Add to dashboard Cite

show abstract

Mosquitofish predation and aquatic vegetation determine emergence patterns of dragonfly assemblages

Cited by 17 publications

References 54 publications

Nutrient availability and invasive fish jointly drive community dynamics in an experimental aquatic system

Nutrient availability and invasive fish jointly drive community dynamics in an experimental aquatic system

Status of aquatic and riparian biodiversity in artificial lake ecosystems with and without management for recreational fisheries: Implications for conservation

Influence of fishes on macroinvertebrate communities and insect emergence production in intermittent stream refuges

Contact Info

Product

Resources

About