Biology and ecology of Brazilian elodea (Egeria densa) and its specific herbivore, Hydrellia sp., in Argentina

Walsh, Guillermo Cabrera; Dalto, Y. Magalí; Mattioli, Federico; Carruthers, Raymond I.; Anderson, Lars

doi:10.1007/s10526-012-9475-x

Cited by 24 publications

(10 citation statements)

References 26 publications

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“…The winter growth of E. densa is slow and this species tends to store starch for subsequent spring growth (Yarrow et al, 2009). It can recover from winter senescence and quickly reinvade water bodies through energy stored in basal stems and the root crown (Pennington and Sytsma, 2009; Cabrera et al, 2013), but the optimal temperature range for its active growth is 14 to 25°C (Pennington, 2008). However, the water temperature was only up to 14°C in late April, which could explain why E. densa grew slowly and did not recover during the experimental period.…”

Section: Discussionmentioning

confidence: 99%

Greater Performance of Exotic Elodea nuttallii in Response to Water Level May Make It a Better Invader Than Exotic Egeria densa During Winter and Spring

et al. 2019

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The strategy of producing rapid initial growth and establishing early in the growing season is important, and it is employed by invasive macrophytes. Elodea nuttallii and Egeria densa , two Hydrocharitaceae species, became weeds after invading many countries in recent years. Comparative studies on their invasive traits in relation to native species during winter and spring are limited. In the present study, we compared the growth performance of these two exotic species with a perennial native species, Potamogeton maackianus , in different water depths (1, 2, and 3 m) during winter (January and February) and spring (March and April). Three morphological traits (shoot number, root number and shoot length), total biomass, relative growth rate (RGR) and two physiological photosynthetic traits (total chlorophyll content and the maximum quantum yield of PSII [ F v/ F m]) were measured for each macrophyte. All three species could overwinter as entirely leafy plants. Biomass, RGR, morphological traits and physiological traits were all different among species. However, water depths had a significant effect only on morphological traits. At all water depths, E. nuttallii had significantly higher values for morphological traits, total biomass and RGR than P. maackianus , while E. densa had significantly fewer roots and a lower total chlorophyll content than P. maackianus . Except for F v/ F m at a 3 m water depth, morphological and physiological photosynthetic traits, biomass and RGR of E. nuttallii were significantly higher than those of E. densa. In addition, a large number of adventitious roots developed from E. nuttallii but not from the other two species. These results indicate that the advantages of E. nuttallii to grow in winter and spring may make it more prone to expansion than E. densa in China.

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Section: Discussionmentioning

confidence: 99%

Greater Performance of Exotic Elodea nuttallii in Response to Water Level May Make It a Better Invader Than Exotic Egeria densa During Winter and Spring

et al. 2019

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“…The insect diet appears to be highly nutritious and adults reproduced with more success compared to adults fed the traditional diet of sugar–yeast hydrolyzate mixture developed by Buckingham et al. () and used since (Grodowitz et al., , , ; Balciunas & Burrows, ; Cabrera Walsh et al., ; Mangan & Baars, ; Sonal Varia, pers. comm.…”

Section: Discussionmentioning

confidence: 99%

“…Rearing techniques have been developed for Hydrellia flies under laboratory conditions, dating back to the late 1980s following the importation of Hydrellia balciunasi Bock and Hydrellia pakistanae Deonier into quarantine as part of a control effort on Hydrilla verticillata (L.f.) Royle in the USA (Buckingham et al., ). The laboratory diet described for H. balciunasi and H. pakistanae consists of a sugar–yeast hydrolyzate mixture (4 g yeast hydrolyzate, 7 g sucrose, 10 ml water) and a sugar–water mixture (1:1), and this has largely been the culturing method employed for the majority of Hydrellia species undergoing evaluation as biological control agents to date (Grodowitz et al., , , ; Balciunas & Burrows, ; Martin et al., ; Cabrera Walsh et al., ; Mangan & Baars, ; Sonal Varia, pers. comm.).…”

Section: Introductionmentioning

confidence: 99%

Responses of adult Hydrellia lagarosiphon to a revised diet: implications for life cycle studies and laboratory culturing techniques

Mangan

Dirilgen

Baars

2015

Entomologia Exp Applicata

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Preservation of an insect culture under laboratory conditions is essential for its study. Numerous diets have been developed for entomophagous insects undergoing screening as biological control agents in attempts to improve the nutritional quality of food provided in laboratory settings. However, less emphasis has been given to developing a more effective laboratory diet for phytophagous insects with the adult life stage not dependant on the target species. The larvae of Hydrellia lagarosiphon Deeming (Diptera: Ephydridae) mine the leaves of Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae). This species is currently under consideration as a biological control agent of this aquatic invasive. Rearing techniques for the adult stage of other Hydrellia species have been developed but current diets are not ideal as they result in relatively low reproduction rates. We compared alternative nutritional regimes and quantified their impact on life history attributes of H. lagarosiphon. The diets included the previously developed yeast-sugar diet, a newly developed insect-derived diet, and a diet that combined the two. Total fecundity was significantly higher for females on an insect-derived diet compared with the traditional carbohydrate diet and the net reproductive rate (R o ) was also higher. Population doubling time (T d ) was lower, decreasing by 30% compared to the traditional laboratory diet developed for Hydrellia species. Adult females fed the combination diet, including both insect and non-insect foods, laid 30% fewer eggs than those reared on an insect diet alone. Consequently, insect-derived nutritional regimes could improve culturing techniques significantly and if permission to release the agent is granted, this diet may benefit mass rearing efforts potentially saving time and reducing associated costs.

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“…Egeria densa Planchon, 1849, Hydrocharitaceae (Brazilian waterweed; also known as leafy elodea or dense waterweed) is a rooted submerged aquatic macrophyte native to Brazil, Argentina and Uruguay (Cook and Urmi-König 1984;Cabrera Walsh et al 2013). Stems are elongate, with a diameter of between 1 and 3 mm and irregular side branching (Cook and Urmi-König 1984).…”

Section: Introductionmentioning

confidence: 99%

“…These were reared from puparia of the ephydrid fly, Hydrellia egeriae Rodrigues-Júnior, 2015, a phytophagous biological control agent attacking Egeria densa. The Ephydridae contain a number of important naturally-occurring biological control agents of submerged invasive waterweeds (Wheeler and Center 2001;Baars et al 2010;Coetzee et al 2011a, b;Cabrera Walsh et al 2013;Bownes 2014). These flies are attacked by braconid parasitoid wasps mainly belonging to the genera Ademon Haliday, 1833 and Opius Wesmael, 1835 (subfamily Opiinae); and Chaenusa Haliday, 1839 and Chorebus Haliday, 1833 (tribe Dacnusini, subfamily Alysiinae) (Yu et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Identity of parasitoid wasps (Hymenoptera, Braconidae and Eulophidae) reared from aquatic leaf-mining flies (Diptera, Ephydridae) on invasive Brazilian waterweed Egeria densa in South Africa

Noort¹,

Smith²,

Coetzee³

2021

924

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The Brazilian waterweed, Egeria densa Planchon, 1849 (Hydrocharitaceae), is an invasive species in South Africa where it is a host plant for the aquatic leaf-miner Hydrellia egeriae Rodrigues-Júnior, 2015 (Ephydridae, Diptera). Efficacy of the biocontrol agent can potentially be affected by parasitoids. Three species of braconid parasitoid wasps were reared from puparia of Hydrellia egeriae. By comparison with the type specimens, these species have been determined to be Ademon lagarosiphonae van Achterberg, 2012 (Braconidae: Opiinae), Chaenusa anervata van Achterberg, 2012 and Chaenusa seminervata van Achterberg, 2012 (Braconidae: Alysiinae: Dacnusini), all previously recorded as parasitoids of an ephydrid dipterous aquatic leaf-miner, Hydrellia lagarosiphon Deeming, 2012, on Lagarosiphon major (Ridley, 1886) Moss ex Wager (Hydrocharitaceae) in South Africa. The chalcidoid, Janicharis africanus Gumovsky & Delvare, 2006 (Eulophidae), was also reared from Hydrellia egeriae and is possibly a hyperparasitoid of the braconids. South Africa is a new country record for J. africanus. We provide comprehensive images of all species including the braconid types and illustrated identification keys to the Afrotropical species of the two braconid genera are also provided. All images and online keys are available on WaspWeb (http://www.waspweb.org).

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Biology and ecology of Brazilian elodea (Egeria densa) and its specific herbivore, Hydrellia sp., in Argentina

Cited by 24 publications

References 26 publications

Greater Performance of Exotic Elodea nuttallii in Response to Water Level May Make It a Better Invader Than Exotic Egeria densa During Winter and Spring

Greater Performance of Exotic Elodea nuttallii in Response to Water Level May Make It a Better Invader Than Exotic Egeria densa During Winter and Spring

Responses of adult Hydrellia lagarosiphon to a revised diet: implications for life cycle studies and laboratory culturing techniques

Identity of parasitoid wasps (Hymenoptera, Braconidae and Eulophidae) reared from aquatic leaf-mining flies (Diptera, Ephydridae) on invasive Brazilian waterweed Egeria densa in South Africa

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