Journal of Aquatic Plant Management最新文献

{"title":"Biological control of invasive floating fern leads to rapid recovery of ecological functions in coastal fresh water wetlands in Louisiana","authors":"Steven Woodley, Charles Wahl, Alexander Tryforos, Rodrigo Diaz","doi":"10.57257/japm-d-22-00011","DOIUrl":"https://doi.org/10.57257/japm-d-22-00011","url":null,"abstract":"Despite the success of the salvinia weevil ( Cyrtobagous salviniae ) at controlling giant salvinia ( Salvinia molesta ), its impact on the timing of reduction of giant salvinia cover and recovery of submerged aquatic vegetation (SAV) and dissolved oxygen remains unknown. A two-year field study (2016 to 2017) was conducted in coastal wetlands in southwestern Louisiana to measure the impact of biological control of giant salvinia. Water temperature, dissolved oxygen, weevil densities, and giant salvinia and SAV cover were assessed at 36 sampling locations comprising canals, small ponds, and large ponds. Results showed that adult weevils were distributed across the landscape. In 2016 mean adult densities were 46.9 weevils kg (cid:2) 1 in canals, 42.5 weevils kg (cid:2) 1 in small ponds, and 38.7 weevils kg (cid:2) 1 in large ponds. In 2017 mean adult weevil densities were 28.2 kg (cid:2) 1 in canals, 12.3 kg (cid:2) 1 in small ponds, and 29.4 kg (cid:2) 1 in large ponds. Percent cover of SAV was zero at all three site types in July 2016 but increased by 29.4, 35.0, and 73.3% in small ponds, canals, and large ponds, respectively, from July 2016 to January 2017. Our models demonstrate that higher adult weevil densities in June lead to faster control of giant salvinia and SAV recovery, subsequently increasing dissolved oxygen levels. The models can be used to estimate months needed to control salvinia given weevil density, percent salvinia cover, and site type. Resource managers could apply this to inform about timing to control and guide management decisions.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49097046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cadmium accumulation in duckweed relates to pH and oxalate synthesis in Cd shock","authors":"Xueman Ma, Jianyao Zeng, Y. He, Zihan Xu, Wenquiao Wang, Yunwen Yang, L. Yang","doi":"10.57257/japm-d-23-00002","DOIUrl":"https://doi.org/10.57257/japm-d-23-00002","url":null,"abstract":"Anthropogenic activities increase cadmium (Cd) pollution in aquatic systems. This study investigated how the pH change from 4.3 to 7.3 affected the absorption of Cd by the aquatic plant duckweed ( Lemna turionifera 5511). Here, the noninvasive microtest technique (NMT), high-performance liquid chromatography (HPLC), and transcriptome analysis were used to study the duckweed’s Cd absorption and the oxalic acid metabolism under different pH conditions. The results showed the highest Cd accumulation in duckweed with pH at 6.3. Furthermore, the Cd influx was higher at the root tip of duckweed cultured in a liquid medium at pH 6.3. Notably, Cd stress changed the pH value and H þ influx in duckweed roots, and significantly upregulated the Na þ /H þ exchange transporters. Moreover, duckweed was shown to have enhanced oxalate acid secretion and signifi-cantly upregulated biosynthesis-related genes under Cd stress. Therefore, these analyses suggest that Na þ /H þ exchange transporters and oxalic acid might affect Cd accumulation, which could provide new ideas for phytoremediating Cd pollution using duckweed.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71097989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Herbivory impacts Vallisneria americana recovery in the lower St. Johns River, Florida","authors":"Riley Timbs, Dan Kolterman","doi":"10.57257/japm-d-23-00003","DOIUrl":"https://doi.org/10.57257/japm-d-23-00003","url":null,"abstract":"Tape grass (Vallisneria americana) once formed large, dense meadows of long (up to 1 m) plants in the littoral zones of Lower St. Johns River (LSJR) and its associated lakes and tributaries (Sagan 2007). Tape grass and most other nonalgal submerged aquatic vegetation (SAV) vanished from much of the river basin after an extended period of high, tanninstained water and increased turbidity due to flooding from Hurricane Irma in 2017 (Goldberg and Trent 2020, Lundy et al. 2022, K.J., unpub. data). Flood events in the LSJR commonly cause temporary SAV die-offs (Lacoul and Freedman 2006, Bornette and Puijalon 2011). In 2004 prolonged conditions of low light availability caused by strikes from three major hurricanes (Charley, Frances, and Jeanne) were followed by extensive SAV loss throughout the river basin. Tape grass and other SAV re-emerged within 3 yr as the river returned to baseline hydrologic and water quality conditions. By contrast, SAV in the LSJR did not fully recover in the 5 yr between when Hurricane Irma made landfall in 2017 and 2022, despite a return to background water conditions. The tape grass plants that remain as of 2022 when data were collected for this study are sparse and have canopy heights below 10 cm (Goldberg and Trent 2020, Lundy et al. 2022, K.J., unpub. data). Herbivory commonly limits tape grass recovery in freshwater and estuarine habitats, including Kings Bay and other Florida waterways, but the extent to which it impacts SAV in the LSJR is unknown (Carter and Rybicki 1985, Hauxwell et al. 2004b, Johnson et al., 2019). Recent efforts to restore tape grass upstream of the LSJR in Lake George and Silver Glen Spring by using wire fenced enclosures to prevent grazing by herbivores yielded canopy heights approximately 10fold higher than surrounding unenclosed plants. When these protective fences were removed or breached the plants were grazed by cooters (Pseudemys spp.) within days to canopy heights equal to the surrounding SAV (, 10 cm). Additionally, blue tilapia (Oreochromis aureus) were observed uprooting unprotected plants near the restoration area (D.K., unpub. data). The Florida Fish and Wildlife Conservation Commission (FWC) has received multiple reports indicating that the tape grass beginning to re-establish areas of the LSJR appear similar to the heavily grazed plants in Lake George and Silver Glen Spring. This study was conducted to determine the effect of herbivory on the growth of tape grass in the Lower St. Johns River.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44317419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of selected herbicides on Cuban bulrush [Oxycaryum cubense (Poepp. & Kunth) Lye]","authors":"J. Jablonski, Candice M. Prince, S. Enloe, G. MacDonald, Benjamin P. Sperry","doi":"10.57257/japm-d-22-00008","DOIUrl":"https://doi.org/10.57257/japm-d-22-00008","url":null,"abstract":"Cuban bulrush (Oxycaryum cubense) (Poepp. & Kunth) Lye is an epiphytic perennial sedge that invades aquatic habitats in the southeastern United States. Its emergent and floating growth habit allows it to form tussocks that restrict waterway access for navigation and outcompete native plant species. It is primarily managed using herbicides, and there is a need to evaluate more active ingredients for Cuban bulrush control. Three groups of single or tank mix herbicide applications were evaluated for control of Cuban bulrush in a greenhouse setting Florida. In trial 1, we evaluated operational treatments currently used by state agencies in Florida (diquat, glyphosate, 2,4-D, glyphosate þ flumioxazin, 2,4-D þ diquat, and 2,4-D þ glyphosate). In trial 2, we evaluated a recently registered synthetic auxin herbicide (florpyrauxifen-benzyl) alone or in combination with 2,4-D, imazamox, or flumioxazin. In trial 3, we evaluated several acetolactate synthase (ALS)-inhibitor herbicides (halosulfuron, imazapic, imazethapyr, bispyri-bac-sodium, imazapyr, and imazamox). Operational treat-ments and florpyrauxifen-benzyl combinations resulted in . 70% visual control 30 days after treatment (DAT) and . 90% biomass reduction of aboveground tissue 60 DAT. ALS-inhibiting herbicides resulted in slower symptom development, although there was limited regrowth (. 90% biomass reduction) 60 DAT for plants treated with imazapic, imazethapyr, imazamox, and imazapyr. Halosulfuron and bispyribac-sodium resulted in inconsis-tent levels of control between experimental runs. These small-scale results suggest that the current operational treatments as well as florpyrauxifen-benzyl combinations provide both fast and effective control of Cuban bulrush. Future work will focus on verifying these findings under operational field conditions.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45796378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phenology of two-horned water chestnut (Trapa bispinosa Roxb. var. iinumai Nakano)in northern Virginia ponds","authors":"S. Poudel, Nancy B. Rybicki, Christian M. Jones","doi":"10.57257/japm-d-22-00009","DOIUrl":"https://doi.org/10.57257/japm-d-22-00009","url":null,"abstract":"Species of water chestnut, specifically Eurasian water chestnut (Trapa natans), have plagued the northeastern United States, including the tidal Potomac, for over 100 years. In 2014 a new species of invasive water chestnut identified as two-horned water chestnut (Trapa bispinosa Roxb. var. iinumai Nakano) was discovered in the Potomac River, and in subsequent years it has spread to nearby waterbodies. The purpose of this study is to describe the phenology of T. bispinosa to assist managers in developing effective approaches for management. Structured observa-tional studies were conducted at two ponds in northern Virginia in 2019 and 2020. Trapa bispinosa initiated growth in late April, increasing rapidly to a maximum of 100% cover in June. Rosette diameters increased gradually from late April to a maximum in August and September. This increase in rosette size was strongly correlated with degree days and calendar days and is consistent among ponds and between years. Flower counts were zero from April through June, then increased rapidly to maximum in late August. Fruit counts were zero from April through June; fruit started to appear in July, and counts increased to a maximum in early September. Since the species is annual and dependent on sexual reproduction, control efforts for T. bispinosa should be initiated before fruits are produced. Based upon our data, in the mid-Atlantic region, May would be an ideal time to begin because rosettes should be observable, but flowers and fruit should not appear until late June. These studies indicate aquatic managers may have a 4-to-6-wk window in the late spring to prevent seed production and should focus resources on management during that period.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48373312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"dentification and prioritization of sites with overwintering cyanobacteria to inform preventative management of harmful algal blooms","authors":"Alyssa Calomeni","doi":"10.57257/japm-d-22-0000x","DOIUrl":"https://doi.org/10.57257/japm-d-22-0000x","url":null,"abstract":"Cyanobacteria causing harmful algal blooms (HABs) can overwinter in sediments as quiescent cells (akinetes or vegetative colonies) and contribute to bloom resurgences. Targeting overwintering cells in sediments for preventative management may provide a viable approach to delay onset and mitigate blooms. However, there are limited resources for this novel strategy. Given the growing global impact of HABs, the ability to identify and prioritize sites that are influenced by overwintering cells will be a critical step for preventative management. Therefore, the overall objective of this study was to identify and illustrate relevant data to support identification and prioritization of sites that contain overwintering cells with the potential to form HABs. To achieve this, sediment samples were collected from three HAB-affected reservoirs (Marion Reservoir, KS; Fort Gibson Lake, OK, and Heyburn Lake, OK) as pertinent examples. Cyanobacteria enumeration and growth potential data from incubation studies were assembled for prioriti-zation. Overwintering cells were present in all HAB-affected reservoirs, with 85% of sites (n ¼ 13) containing overwin-tering cells in sediments and 54% of sites (n ¼ 13) with a planktonic growth potential producing problematic cell densities (. 100,000 cells ml􀀁1). On the basis of the weight of evidence, Marion Reservoir, followed by Fort Gibson, and last, Heyburn Lake, have the greatest potential for over-wintering cells to contribute to HABs. These data indicate that a monitoring approach should consider at least two lines of evidence: 1) presence and density of overwintering cyanobacteria and 2) growth potential as informed by laboratory incubation studies to predict growth risk and prioritize locations for preventative management.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43211820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"American frogbit response to herbicides","authors":"G. Turnage, A. Lázaro-Lobo, Ben Blassingame, Olivia Robinson, Kennedy Calhoun, G. Ervin","doi":"10.57257/japm-d-21-00022","DOIUrl":"https://doi.org/10.57257/japm-d-21-00022","url":null,"abstract":"Limnobium spongia (frogbit) is a free-floating aquatic plant that can produce extensive floating mats causing negative ecological, social, and economic impacts that can harm aquatic fauna (i.e., dissolved oxygen depletion) and restrict human uses of water. Literature describing effective control measures for frogbit is minimal. Efficacy of high and low doses of seven foliar-applied herbicides (2,4-D, florpyraux-ifen-benzyl, flumioxazin, glyphosate, imazamox, imazapyr, and triclopyr) were evaluated in a mesocosm setting in the summers of 2018, 2020, and 2021. Both emergent and submersed frogbit biomass were reduced at least 99% by imazamox (0.56 and 1.11 kg ai ha􀀁1) and imazapyr (0.42 and 0.84 kg ae ha􀀁1) 8 wk after treatment (WAT) compared with nontreated reference plants. Triclopyr (6.71 kg ae ha􀀁1) reduced frogbit biomass 92% and flumioxazin (0.42 kg ai ha􀀁1) reduced biomass 87 to 93% compared with reference plants. 2,4-D (2.12 and 4.24 kg ae ha􀀁1), glyphosate (2.83 and 5.67 kg ai ha􀀁1), triclopyr (3.36 kg ae ha􀀁1), florpyrauxifen-benzyl (0.02 and 0.05 kg ai ha􀀁1), and flumioxazin (0.21 kg ai ha􀀁1) did not reduce frogbit biomass 8 WAT compared with reference plants. Future research should consider the efficacy of different herbicide combinations to control frogbit, as well as the role of diluent volume per unit area, especially with imazamox and imazapyr. Field studies also will be useful in determining whether the results observed in this study will translate to management of frogbit in natural settings.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49085574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water chestnut biomass estimates using density as a proxy: Facilitating multiyear comparisons with a streamlined approach","authors":"Jacob L. Moore, Mitchell O'Neall, Colleen Lutz, S. Pearson","doi":"10.57257/japm-d-22-00007","DOIUrl":"https://doi.org/10.57257/japm-d-22-00007","url":null,"abstract":"Water chestnut (Trapa natans) is an invasive macrophyte negatively impacting native aquatic communities in the United States. In New York state, water chestnut occurrence is monitored through iMapInvasives, a public database that includes several data fields for all records, such as distribution type (or categorical density). Biomass is not regularly recorded in iMapInvasives but is important as a secondary measurement to gauge primary production, nutrient uptake, and invasive impact. Lack of biomass data in iMapInvasives may be addressed with alternative methods of acquiring biomass information from records. The primary goal of this project was to develop methods that allow comparable biomass estimates to be made using a measured area and an observed distribution type in the iMapInvasives database. Nine locations were sampled for water chestnut in June and July 2021. Areas of sparse, dense, and monoculture growth were recorded along with trace points. Collected plants were cleaned, measured, and dried to obtain final dry biomass density values for each distribution type. Density values were highest in monocul-ture and lowest in sparse but also varied based on location and date. ANOVA testing indicated that plant density, rosette growth, and rosette width varied among distribution types. Our water chestnut measurements were used to create formulas that can estimate biomass using presence-and distribution-type data in iMapInvasives. These formulas may be useful for stakeholders and managers seeking to understand the invasive impact of water chestnut and assess its change in abundance over time.","PeriodicalId":15100,"journal":{"name":"Journal of Aquatic Plant Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45221207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}