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Obregón-Barboza, Hortencia; Maeda-Martínez, Alejandro M.; Murugan, Gopal

doi:10.1023/a:1013142419714

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…Control triops molted every 2.6 days. This is similar to what was observed in an earlier study [49], where T. longicaudatus molted every 2.5 to 2.8 days. Triops exposed to higher concentrations of potassium dichromate (40 and 80 µg/L) showed an increase in the time to maturation compared to the control (way ANOVA: F(4,15) = 5.138; p = 0.008) (Figure 3).…”

Section: Resultssupporting

confidence: 91%

Ecotoxicological Effects of Potassium Dichromate on the Tadpole Shrimp Triops longicaudatus

Pereira,

Saraiva,

Oliva-Teles

et al. 2024

Animals

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The tadpole shrimp Triops longicaudatus is a freshwater crustacean with fast embryonic and larval development, short life cycle, and high fecundity. They are very active swimmers of a reasonable size, easy to spot and record. Such characteristics make it a promising candidate as an experimental model in ecotoxicology to evaluate the effects of aquatic pollutants, particularly using its locomotor behavior as an endpoint. To evaluate the sensitivity of T. longicaudatus and develop endpoints of interest, we conducted exposure experiments with lethal and sub-lethal concentrations of potassium dichromate, a compound known for its ecotoxicological importance and as a hexavalent chromium source. The endpoints evaluated were mortality, growth, sexual maturation, reproductive output, cholinesterase activity and locomotor/swimming behavior. The 96 h median lethal concentration was found to be 65 µg/L. Furthermore, exposure to potassium dichromate at higher concentrations had a significant negative impact on the growth rate of T. longicaudatus in terms of both body mass and length. The time for maturation was also delayed at higher concentrations. In addition, locomotor behavior allowed for the discrimination of all tested chromium concentrations and the control group and from each other, proving to be the most sensitive endpoint. Overall, the data support the potential of T. longicaudatus as a model for ecotoxicity testing, using apical endpoints with impact at the population level; in particular, results suggest that behavior assessments in this species might be useful for detecting hazardous compounds in environmental monitoring of freshwater ecosystems.

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Section: Resultssupporting

confidence: 91%

Ecotoxicological Effects of Potassium Dichromate on the Tadpole Shrimp Triops longicaudatus

Pereira,

Saraiva,

Oliva-Teles

et al. 2024

Animals

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“…These authors proposed Artemia monica as the valid name for the New World A. franciscana group. Maeda-Martínez et al [22] cited as Triops sp., all known Mexican tadpole shrimp populations and revised the existence of biochemical [194], molecular (12S mtDNA) [195], histological [196], reproductive [197], and morphological [194] differences. Studies show the existence of several species, and therefore a systematic reevaluation is needed.…”

Section: Large Branchiopodsmentioning

confidence: 99%

Freshwater Diversity of Zooplankton from Mexico: Historical Review of Some of the Main Groups

Cervantes-Martínez

Ramírez

Elías‐Gutiérrez

et al. 2023

Water

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In this review, we include rotifers, copepods, and cladocerans, including other groups not usually deemed as zooplankters: i.e., protists, acari, and large branchiopods. The objectives of this study were to integrate the dispersed literature on the taxonomy and diversity of these freshwater zooplankton groups and to explain (1) how these contributions can be arranged in distinct historical periods and (2) how this knowledge has allowed the detection of exotic and threatened species. We divided the freshwater zooplankton studies in Mexico into three historical periods: the first one comprised the 1840s to the 1940s when foreign researchers carried out most studies during several expeditions. Spanish researchers promoted surveys on different zooplankton taxa at the end of this first period. The second period, from the early 1950s to the end of the 1990s of the XX century, showed a remarkably increased research activity in its last ten years only (that is, during the 1990s to 2000), represented by contributions of a new generation of Mexican zooplanktologists. This period yielded more complete zooplankton listings and detailed morphological descriptions of rotifers, cladocerans, copepods, and large branchiopods. The third period started from the year 2000 to date. During this time, listings and online faunistic baselines based on integrative taxonomy have been the primary trend. An account of exotic zooplankters and conservation issues of several native species are discussed. The results of this review show that the knowledge of the freshwater zooplankton of this country has increased significantly over the last 40 years, with at least 408 first records of species for Mexico. Currently, the knowledge of Mexican freshwater zooplankton is among the most complete in the world. However, it is estimated that only a small fraction of the true diversity has been documented.

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“…As the viability of a Triops egg cannot be visually discerned, unlike with rotifers (García-Roger, Carmona & Serra, 2005), viability estimates rely on successful hatching of diapausing eggs. Rehydration and incubation of sediment containing diapausing Triops eggs has been used for the study of hatchlings in the laboratory (Sassaman, Simovich & Fugate, 1997; Obregón-Barboza, Maeda-Martínez & Murugan, 2001; Schönbrunner & Eder, 2006; Harper & Reiber, 2006; Zierold, Hänfling & Gómez, 2007). Additionally, collected sediment can also be progressively sieved through finer meshes to isolate, identify and hatch the eggs of Triops and other species it contains (Kuller & Gasith, 1996).…”

Section: Introductionmentioning

confidence: 99%

A new molecular diagnostic tool for surveying and monitoring Triops cancriformis populations

Sellers

Griffin

Hänfling

et al. 2017

PeerJ

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The tadpole shrimp, Triops cancriformis, is a freshwater crustacean listed as endangered in the UK and Europe living in ephemeral pools. Populations are threatened by habitat destruction due to land development for agriculture and increased urbanisation. Despite this, there is a lack of efficient methods for discovering and monitoring populations. Established macroinvertebrate monitoring methods, such as net sampling, are unsuitable given the organism’s life history, that include long lived diapausing eggs, benthic habits and ephemerally active populations. Conventional hatching methods, such as sediment incubation, are both time consuming and potentially confounded by bet-hedging hatching strategies of diapausing eggs. Here we develop a new molecular diagnostic method to detect viable egg banks of T. cancriformis, and compare its performance to two conventional monitoring methods involving diapausing egg hatching. We apply this method to a collection of pond sediments from the Wildfowl & Wetlands Trust Caerlaverock National Nature Reserve, which holds one of the two remaining British populations of T. cancriformis. DNA barcoding of isolated eggs, using newly designed species-specific primers for a large region of mtDNA, was used to estimate egg viability. These estimates were compared to those obtained by the conventional methods of sediment and isolation hatching. Our method outperformed the conventional methods, revealing six ponds holding viable T. cancriformis diapausing egg banks in Caerlaverock. Additionally, designed species-specific primers for a short region of mtDNA identified degraded, inviable eggs and were used to ascertain the levels of recent mortality within an egg bank. Together with efficient sugar flotation techniques to extract eggs from sediment samples, our molecular method proved to be a faster and more powerful alternative for assessing the viability and condition of T. cancriformis diapausing egg banks.

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Cited by 10 publications

References 25 publications

Ecotoxicological Effects of Potassium Dichromate on the Tadpole Shrimp Triops longicaudatus

Ecotoxicological Effects of Potassium Dichromate on the Tadpole Shrimp Triops longicaudatus

Freshwater Diversity of Zooplankton from Mexico: Historical Review of Some of the Main Groups

A new molecular diagnostic tool for surveying and monitoring Triops cancriformis populations

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