Conservation Genetics of North America Desert Fishes

Vrijenhoek, Robert C.

doi:10.1007/978-1-4757-2504-9_12

Cited by 23 publications

(22 citation statements)

References 62 publications

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“…Similarly, losses of heterozygosity in desert fish Poeciliopsis spp. have been associated with increased susceptibility to parasites (Vrijenhoek, 1996). Another explanation for the differences in resistance between populations found in this study may be that the differences in susceptibility reflect the amount of genetic variation present in the population.…”

Section: Discussionmentioning

confidence: 61%

Differences in initial and acquired resistance to Ichthyophthirius multifiliis between populations of rainbowfish

Gleeson

McCallum

Owens

2000

Journal of Fish Biology

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Wild-caught rainbowfish Melanotaenia spp. originating from three isolated populations were infected with a quantified dosage of parasites Ichthyophthirius multifiliis in a controlled environment. The Melanotaenia eachamensis from Dirran Creek were much more susceptible to ichthyophthiriasis than were M. splendida from the Lake Tinaroo or Bluewater Creek populations. When the highly susceptible Dirran Creek rainbowfish were crossed with rainbowfish from a fourth population, Lake Eacham M. eachamensis, they produced hybrids with significantly higher resistance than pure-bred Dirran Creek, but not higher than pure-bred Lake Eacham fish. Hence, intraspecific hybridization increased resistance to I. multifiliis infection in M. eachamensis. Hosts from all three populations were much less susceptible to infection on their second exposure to the parasite. However, the Bluewater Creek population was better able to acquire immunity to I. multifiliis than either the Dirran Creek or Lake Tinaroo populations. It is tentatively suggested that there may be a link between the heterozygosity of populations of rainbowfish and their initial ability to resist infection by Ichthyophthirius multifiliis. 2000 The Fisheries Society of the British Isles

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Section: Discussionmentioning

confidence: 61%

Differences in initial and acquired resistance to Ichthyophthirius multifiliis between populations of rainbowfish

Gleeson

McCallum

Owens

2000

Journal of Fish Biology

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“…data), and gene flow among local populations has occurred in the past; (2) the habitat characteristics of each tributary were similar. Thus, we expect that genetic management will contribute to the mitigation of the immediate threat of inbreeding depression, as has occurred in other cases of endangered fish and taxa (fish: Vrijenhoek, 1996;mammal: Perzanowski, Olech & Kozak 2004;bird: Westemeier et al, 1998;plant: Kephart, 2004). The efficiency of these genetic managements can be evaluated by measuring the changes in the occurrences of deformed fish observed already in the populations studied (Sato 2006a,b), which represents a practical example for genetic rescue.…”

Section: Management Recommendationsmentioning

confidence: 99%

Loss of genetic variation and effective population size of Kirikuchi charr: implications for the management of small, isolated salmonid populations

Sato

Harada

2008

Animal Conservation

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Small, isolated populations may face extinction due to a combination of inbreeding depression and other threats. Effective population size (N e ) is one comprehensive measure that allows us to evaluate the genetic status of a population, and to make management decisions regarding genetic viability. We simulated loss of genetic variation and estimated N e for two small, isolated populations of Kirikuchi charr Salvelinus leucomaenis japonicus, the endangered, southernmost local populations of the genus Salvelinus in the world, using VORTEX, an individual-based stochastic PVA model. Approximately half of the genetic variation was lost over 200 years regardless of census population size and demographic parameters, and N e estimates were roughly 50 in each of the two populations, suggesting the possibility of inbreeding depression. The target population size of N e 4500, by securing long-term viability, is several times that of the present size of each of the populations studied, and no local habitats maintaining such a target number are considered to exist. The results strongly indicate a need for recovering natural connections and potential gene flow among local populations. However, the impending threat to these populations from non-native charr widely distributed throughout the drainage has prevented the recovery of the connections. Given the small N e of the two populations, it would be necessary to retain gene flow artificially within or across local populations. This will be true of many other salmonid populations that have been isolated or fragmented recently.

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“…The decrease of genetic diversity in populations is well known to have the potentiality to cause genetic deficiency, such as decline in survival and growth rate, unstable development, and low resistance to disease (Vrijenhoek, 1996). In addition, Primack (1995) remarked that isolated small populations are apt to be on the verge of extinction, mainly as the result of genetic factors and demographic and environmental fluctuations.…”

Section: Acii Afai Hinfi Mspi Scrfi Tspei Acii Alui Bstui Ddei Haeiiimentioning

confidence: 99%

Genetic diversity in the Japanese rosy bitterling, Rhodeus ocellatus kurumeus (Cyprinidae)

Kawamura

Nagata

Ohtaka³

et al. 2001

Ichthyological Research

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Comparison of meristic characters (pored lateral line scales, vertebrae, and fin rays), and PCR-RFLP analysis in the D-loop and ND1 regions of mitochondrial DNA were performed to estimate the genetic diversity in local populations of the Japanese rosy bitterling, Rhodeus ocellatus kurumeus. In terms of meristic characters, the Fukuoka population was the largest in both range and variance of the number of pored lateral line scales and vertebrae (abdominal and caudal), and Osaka was the second, whereas the Kagawa population showed the smallest range and variance in these characters. In PCR-RFLP analysis, 11 haplotypes (3 in Fukuoka, 2 in Okayama, 2 in Kagawa, and 4 in Osaka) were observed, and nucleotide sequence divergence (NSD) was approximately two times larger in ND1 (mean, 0.61%) than in D-loop (mean, 0.31%). In the neighbor-joining (NJ) tree, based upon the NSD value in ND1, haplotypes were arranged into four clades, which corresponded to the locality of each haplotype. The Fukuoka population was conspicuously apart from the other populations (mean, 0.90% in NSD), but the remaining three showed a similar genetic distance with each other (mean, 0.48%-0.52% in NSD). In haplotype diversity of mtDNA, half the stations in Osaka and all in Kagawa were monomorphic. Especially, two haplotypes endemic to Kagawa were randomly distributed, irrespective of drainages. Rhodeus o. kurumeus in Fukuoka inhabits small rivers and creeks (open water systems), while that in Kagawa and Osaka lives in small ponds (closed water systems). Taking the information of morphology, mtDNA, and habitat into consideration, the low genetic diversity in Kagawa and Osaka populations of R. o. kurumeus is thought to be mainly the result of the isolation of their habitat.

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Conservation Genetics of North America Desert Fishes

Cited by 23 publications

References 62 publications

Differences in initial and acquired resistance to Ichthyophthirius multifiliis between populations of rainbowfish

Differences in initial and acquired resistance to Ichthyophthirius multifiliis between populations of rainbowfish

Loss of genetic variation and effective population size of Kirikuchi charr: implications for the management of small, isolated salmonid populations

Genetic diversity in the Japanese rosy bitterling, Rhodeus ocellatus kurumeus (Cyprinidae)

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