Temperature and Other Factors That Regulate the Composition and Infrapopulation Densities of Bothriocephalus acheilognathi (Cestoda) in Gambusia affinis (Pisces)

Granath, Willard O.; Esch, Gerald W.

doi:10.2307/3280874

Cited by 44 publications

(27 citation statements)

References 18 publications

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“…However, the distribution area is limited between 60°N and 40°S. The spread of B. acheilognathi further north or further south in the southern hemisphere is unlikely, because the cestode is thermophilic with an optimum temperature between 22 and 25°C (Bauer et al 1981;Granath and Esch 1983a;Hanzelova and Itrian 1986).…”

Section: R E T R a C T E D A R T I C L Ementioning

confidence: 99%

“…Bothriocephalus acheilognathi typically measures between 3.5 and 8 cm in length and up to 4 mm in width (Yeh 1955), although specimens of 60 cm and even 1 m (Table 1) have been observed (Baer and Fain 1958;Granath and Esch 1983a) Size is a highly variable morphological parameter as it depends on: (i) Ecological conditions (Nedeva and Mutafova 1988); (ii) Host size (Davydov 1978); (iii) Host species (Molnar and Murai 1973a;Granath and Esch 1983a); (iv) Host age; and (v) Intensity of infection (Davydov 1978). Upon relaxation, parasites can also increase in length by a factor of 1.5-2 (Pool 1987).…”

Section: Descriptionmentioning

confidence: 99%

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RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

2014

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Section: R E T R a C T E D A R T I C L Ementioning

confidence: 99%

Section: Descriptionmentioning

confidence: 99%

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

2014

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“…Considering that B. acheilognathi is hermaphroditic, self-fertilization, as an auxiliary mode of reproduction to adapt for colonization is theoretically possible, especially when a population size bottleneck occurs during colonization (Mather, 1973). The finding in the study of bothriocephalid population dynamics (Granath & Esch, 1983 ;Nie & Kennedy, 1992) that the majority of gravid cestodes of B. acheilognathi and B. claviceps were found in host fish harbouring only 1 cestode may imply the transient occurrence of self-fertilization. Both selfand cross-fertilization have been reported for other species of cestodes, e.g.…”

Section: Discussionmentioning

confidence: 99%

“…B. acheilognathi populations in fish definitive hosts exhibit seasonal changes (Granath & Esch, 1983 ;Liao, 2002), and it may be likely that its population may experience bottleneck events. Gene flow and genetic drift will then be the cause resulting in population structure when population bottleneck occurs, as suggested by Maruyama & Fuerst (1984).…”

Section: Discussionmentioning

confidence: 99%

“…The distribution and pathological effect of the cestode on its fish hosts have caused wide concern, and extensive studies have been carried out on this cestode in relation to its taxonomy, population dynamics and immunology (e.g. Granath & Esch, 1983 ;Pool & Chubb, 1985 ;Riggs & Esch, 1987 ;Nie & Hoole, 1999 ;Liao, 2002). However, relatively little is known with respect to its population genetics.…”

Section: Introductionmentioning

confidence: 99%

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Genetic differentiation in populations of the cestode Bothriocephalus acheilognathi (Cestoda, Pseudophyllidea) as revealed by eight microsatellite markers

et al. 2003

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The genetic structure of populations of the fish cestode, Bothriocephalus acheilognathi collected from Bailianhe Reservoir (BLH), Changshou (CSH) and Liangzi (LZH) Lakes was investigated by using 8 microsatellite loci. A total of 108 adult worms were genotyped at each of the 8 loci. For the 3 populations, the mean number of alleles per locus ranged from 2 . 38 to 5 . 5, and the mean expected heterozygosity ranged from 0 . 432 to 0 . 559. The average polymorphic information content (PIC) was from 0 . 384 to 0 . 492. The significant F is values indicated non-random mating within LZH and BLH populations. On the other hand, when samples were further classified into subpopulations at the level of host fish species, no or little heterozygote deficiency was detected at most loci, showing that cross-fertilization, predominantly, but not exclusively, must have occurred within the subpopulations. Microsatellite markers also revealed an unexpected high level of genetic differentiation, as measured by R st and N m values or by du 2 genetic distance among subpopulations from different hosts. Factors influencing the population genetic structure and the parasite host specificity are discussed.

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Nonlethal Detection of Asian Fish Tapeworm in the Federally Endangered Humpback Chub Using a Molecular Screening Tool

et al. 2019

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Optimal spawning habitat of federally endangered Humpback Chub Gila cypha exists within the Little Colorado River; however, temperatures in the Little Colorado River are also ideal for proliferation of the invasive pathogenic Asian fish tapeworm Schyzocotyle acheilognathi. The current standard for positive identification of the parasite is necropsy and visual examination of the gut via microscopy, a methodology undesirable for assessing infection in endangered fishes. A swab taken at the rectum of the fish and analyzed using a novel DNA primer targeting the cestode cytochrome oxidase I subunit mtDNA gene region offers a convenient nonlethal sampling tool. To validate the nonlethal methodology, primer sensitivity (51.9%) and specificity (79.5%) were calculated by exposing captive fish to the parasite and comparing results using the lethal standard method (i.e., visual examination). Subsequently, we utilized this nonlethal methodology to address prevalence of infection and infection frequency across a range of size‐classes in a wild population of Humpback Chub and addressed possible patterns and mechanisms of infection in the Little Colorado River. When wild Humpback Chub were screened for infection prevalence in spring 2015 (21.4%, n = 140) and fall 2015 (6.6%, n = 258), the relative frequency of infection was highest in juveniles and subadult fish (200–300 mm). Elevated levels of infection near the major spawning grounds of Humpback Chub in the Little Colorado River promote parasitic infection, which may continue to persist without treatment or actions to control infections. We demonstrated that rectal swabs, in conjunction with PCR and primer‐specific identification, offer a time‐efficient nonlethal method to detect infection of Asian fish tapeworm in an endangered fish.

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Temperature and Other Factors That Regulate the Composition and Infrapopulation Densities of Bothriocephalus acheilognathi (Cestoda) in Gambusia affinis (Pisces)

Cited by 44 publications

References 18 publications

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

Genetic differentiation in populations of the cestode Bothriocephalus acheilognathi (Cestoda, Pseudophyllidea) as revealed by eight microsatellite markers

Nonlethal Detection of Asian Fish Tapeworm in the Federally Endangered Humpback Chub Using a Molecular Screening Tool

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