scholarly journals Rearing animals in captivity for the study of trematode life histories. II

1940 ◽  
Vol 24 (2) ◽  
pp. 613-617 ◽  
Author(s):  
Miriam Rothschild
Keyword(s):  
Related Species ◽  
Life Histories ◽  
Adult Fluke ◽  
Morphological Comparison ◽  
Closely Related Species ◽  
In Captivity ◽  
Previous Infection ◽  
In The Wild

The advantage of using laboratory-reared animals in the elucidation of trematode life histories is now generally recognized (Palombi, 1938; Stunkard, 1938, etc.). Further researches seem to emphasize this point. No matter how carefully controls are examined and no matter how precise is the morphological comparison between cercaria, metacercaria and adult fluke, the fact that the intermediate and final hosts have been exposed to previous infection in the wild—particularly by closely related species of worms—immediately detracts from the value of the experiments.

A comparative study of the life histories of Nematodirus battus and N. filicollis, nematode parasites of sheep

Parasitology ◽  
1959 ◽  
Vol 49 (3-4) ◽  
pp. 374-386 ◽  
Author(s):  
R. J. Thomas
Keyword(s):  
Life History ◽  
Intestinal Mucosa ◽  
Related Species ◽  
Life Histories ◽  
Basic Pattern ◽  
Culture Methods ◽  
Closely Related Species ◽  
Nematode Parasites ◽  
History Of ◽  
Comparative Description

1. The life history of N. battus is described, and a comparative description of the life history of N. filicollis is given.2. The life histories of these two species are compared with those of N. spathiger and N. helvetianus, two closely related species, and are shown to follow the same basic pattern, with minor variations in timing which appear to be specific in nature, and not related to differences in culture methods or host species.3. The pathogenesis of Nematodirus species is discussed and related to the migration of larvae into the intestinal mucosa during development.

scholarly journals Living a dog’s life: a putative gray wolf in a feral dog group

Mammalia ◽  
2020 ◽  
Vol 84 (2) ◽  
pp. 115-120
Author(s):  
Elitsa Popova ◽  
Diana Zlatanova
Keyword(s):  
Related Species ◽  
Ecological Impact ◽  
Complex Interaction ◽  
Domestic Dog ◽  
Hybrid Origin ◽  
Mountainous Area ◽  
Gray Wolf ◽  
Closely Related Species ◽  
Feral Dogs ◽  
In The Wild

AbstractThe gray wolf and the domestic dog are closely related species that can interbreed and produce fertile offspring. In settings where unrestrained dogs are present in the wild, hybridization can happen naturally. However, the behavior of the resulting hybrids and their ecological impact is largely understudied. In September–November 2018, a putative gray wolf was repeatedly camera-trapped in a group of 10 presumably feral dogs in a remote mountainous area (the Osogovo Mountain) along the border between Bulgaria and North Macedonia. The most feasible explanation for this individual’s atypical behavior is that it is of hybrid origin (assumption based on phenotype). To the best of our knowledge, this is the first documented observation of such a kind. A discussion of its recruitment and position in the group is presented, setting the basis for further investigation of the complex interaction between wolves, dogs and hybrids in the wild.

Reproductive isolation between two closely related species of the Queensland fruit fly Dracus tryoni (Frogg) and D. neohumeralis Hardy (Diptera : Tephritidae) I. Variation in humeral callus pattern and the occurrence of intermediate colour forms in the wild

1967 ◽  
Vol 15 (3) ◽  
pp. 501 ◽  
Author(s):  
H Wolda
Keyword(s):  
Reproductive Isolation ◽  
Related Species ◽  
Fruit Fly ◽  
Abundant Species ◽  
Colour Pattern ◽  
Wild Populations ◽  
Closely Related Species ◽  
Similar Variation ◽  
In The Wild

A number of samples from wild populations of the Queensland fruit fly, Dacus tryoni and D. neohumeralis, were studied. There is a considerable variation in the colour pattern on the humeral callus. This variation is continuous so that any criterion for distinguishing between "intermediates" and "good species" is purely arbitrary. It was found in areas where D. neohumeralis does not occur as well as in localities where it is very abundant. By whatever criterion one defines intermediates, there appears to be no relation between the frequency of such forms and the presence or absence of D. neohumeralis or with the relative proportions of the two species in the population. However, flies with only a very small yellow area on an otherwise brown humeral callus were found only in Cairns where D. neohumeralis is usually the most abundant species. A similar variation in humeral callus pattern was found in other related species, such as D. kraussi and D. halfordiae. It is concluded that the intermediate colour forms may not be hybrids between D. tryoni and D. neohumeralis but variants of D. tryoni and, possibly the darker forms from Cairns, of D. neohumeralis.

Observations on the Life-histories, Nutritional Requirements and Fecundity of Blowflies

1933 ◽  
Vol 24 (3) ◽  
pp. 353-362 ◽  
Author(s):  
M. J. Mackerras
Keyword(s):  
Sex Ratio ◽  
Life Histories ◽  
Tactile Stimulus ◽  
Marked Effect ◽  
Larval Period ◽  
Nutritional Requirements ◽  
Artificial Light ◽  
Closely Related Species ◽  
In Captivity ◽  
Length Of Life

L. sericata, L. cuprina, Ch. rufifacies, C. stygia and C. augur have been bred through many generations in captivity. These flies were bred in artificial light as well as in sunlight. Inbreeding had no effect upon activity, fecundity or length of life.A diet of protein is necessary for the maturation of ova but not of spermatozoa.Oviposition is not strictly associated with a suitable larval environment, but is more in the nature of a response to a tactile stimulus. Copulation appears to provide an essential stimulus for oviposition.No evidence of parthenogenesis has been obtained and unfertilised females did not lay eggs.The maximum oviposition observed was 3,171 ova by a hybrid Lucilia. This fly lived 94 days.A total oviposition of 2,373 ova was observed in a L. sericata. Both parent flies lived 77 days.The number of ova a fly can produce at one time is dependent on its size and thus on the amount of food obtained in the larval stage.The sex-ratio for Lucilia is very close to 1 : 1. Starvation in the larval period did not have a marked effect on the sex-ratio.It is possible to cross the two closely related species of Lucilia, and the cuprina characters appear to be dominant. It is unlikely that this cross occurs in the field.

Advertisement calls of the lesser spiny frog Quasipaa exilispinosa (Liu and Hu, 1975) (Anura: Dicroglossidae)

Zootaxa ◽  
2021 ◽  
Vol 4926 (3) ◽  
pp. 446-450
Author(s):  
ZHI-QIANG CHEN ◽  
HUA-LI HU ◽  
JUN-JIE ZHONG ◽  
HAI-PING SHANGGUAN
Keyword(s):  
Related Species ◽  
Morphological Traits ◽  
Acoustic Analysis ◽  
Introgressive Hybridization ◽  
Southwestern China ◽  
Closely Related Species ◽  
Advertisement Calls ◽  
Central Vietnam ◽  
In Captivity ◽  
Eleven Species

There are currently only eleven species of Quasipaa (Anura: Dicroglossidae) distributed in southern and southwestern China to central Vietnam, southeastern Thailand, and southwestern Cambodia and presumably also in Laos (Frost 2020). Eight species of Quasipaa are currently known in China: Q. boulengeri (Günther 1889), Q. courtoisi (Angel 1922), Q. exilispinosa (Liu & Hu 1975), Q. jiulongensis (Huang & Liu 1985), Q. shini (Ahl 1930), Q. spinosa (David 1875), Q. yei (Chen, Qu, and Jiang 2002), and Q. verrucospinosa (Bourret 1937). The first seven species are endemic to China (AmphibiaChina 2020). These species have similar morphological traits and are capable of introgressive hybridization between the closely related species of this genus(Zhang et al. 2018). Despite the detailed acoustic analysis that is available to identify a variety of species and is beneficial to the study of anuran taxonomy (e.g., Microhyla species; Chen et al. 2020), advertisement calls have only been reported in detail for Q. spinosa (Yu & Zheng 2009; Chen et al. 2012; Shen et al. 2015) and Q. shini (Kong et al. 2016), whereas the call for Q. exilispinosa was briefly described from observations in captivity (Voitel 2000). 

scholarly journals Species integrity enhanced by a predation cost to hybrids in the wild

2017 ◽  
Vol 13 (7) ◽  
pp. 20170208 ◽  
Author(s):  
P. Anders Nilsson ◽  
Kaj Hulthén ◽  
Ben B. Chapman ◽  
Lars-Anders Hansson ◽  
Jakob Brodersen ◽  
...  
Keyword(s):  
Related Species ◽  
Parental Species ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Hybrid Fitness ◽  
Closely Related Species ◽  
Ecological Selection ◽  
Field Evidence ◽  
In The Wild ◽  
Species Integrity

Species integrity can be challenged, and even eroded, if closely related species can hybridize and produce fertile offspring of comparable fitness to that of parental species. The maintenance of newly diverged or closely related species therefore hinges on the establishment and effectiveness of pre- and/or post-zygotic reproductive barriers. Ecological selection, including predation, is often presumed to contribute to reduced hybrid fitness, but field evidence for a predation cost to hybridization remains elusive. Here we provide proof-of-concept for predation on hybrids being a postzygotic barrier to gene flow in the wild. Cyprinid fishes commonly produce fertile, viable hybrid offspring and therefore make excellent study organisms to investigate ecological costs to hybrids. We electronically tagged two freshwater cyprinid fish species (roach Rutilus rutilus and bream Abramis brama ) and their hybrids in 2005. Tagged fish were returned to their lake of origin, exposing them to natural predation risk from apex avian predators (great cormorant, Phalacrocorax carbo ). Scanning for regurgitated tags under cormorant roosts 3–4 years later identified cormorant-killed individual fish and allowed us to directly test for a predation cost to hybrids in the wild. Hybrid individuals were found significantly more susceptible to cormorant predation than individuals from either parental species. Such ecological selection against hybrids contributes to species integrity, and can enhance species diversification.

scholarly journals A pre-zygotic barrier to hybridization in two con-generic species of scleractinian corals

F1000Research ◽  
2013 ◽  
Vol 2 ◽  
pp. 193 ◽  
Author(s):  
Andrew H. Baird ◽  
Vivian R. Cumbo ◽  
Joana Figueiredo ◽  
Saki Harii
Keyword(s):  
Related Species ◽  
Scleractinian Corals ◽  
Evolutionary Novelty ◽  
Closely Related Species ◽  
Potential Source ◽  
The Family ◽  
Growing Body ◽  
In The Wild

Hybridization is often cited as a potential source of evolutionary novelty in the order Scleractinia. While hybrid embryos can be produced in vitro, it has been difficult to identify adult hybrids in the wild. Here, we tested the potential for hybridization between two closely related species in the family Fungiidae. We mixed approximately 5000 eggs of Ctenactis echinata with sperm from Ctenactis crass. No hybrid embryos were produced. This observation adds to a growing body of evidence for pre-zygotic barriers to hybridization in corals and challenges the claim that hybridization is a major source of evolutionary novelty in the order.

Mitochondrial DNA analysis of Pacific salmonid evolution

1986 ◽  
Vol 64 (5) ◽  
pp. 1058-1064 ◽  
Author(s):  
W. Kelley Thomas ◽  
Ruth E. Withler ◽  
Andrew T. Beckenbach
Keyword(s):  
Mitochondrial Dna ◽  
Rainbow Trout ◽  
Dna Sequences ◽  
Chinook Salmon ◽  
Related Species ◽  
Life Histories ◽  
Chum Salmon ◽  
Dna Analysis ◽  
Salmo Gairdneri ◽  
Closely Related Species

The salmonids of Pacific North America are a group of closely related species with complex life histories and interesting distribution. Previous studies of their evolution and population structure have involved classical morphological and genetic techniques. We have analysed both intra- and inter-specific variation in mitochondrial DNA sequences of the five North American species of the genus Oncorhynchus and the rainbow trout species, Salmo gairdneri. Cleavage sites for 13 different restriction enzymes were sampled, comparing an average of 48 sites per individual, or approximately 1.7% of the genome. No obvious size variation in the 16 500 ± 500 base pair length was observed. Levels of intraspecific variation detected in the chum salmon and rainbow trout were 0.24 ± 0.23 and 0.45 ± 0.26%, respectively. This variation was population specific; no variation was detected within any of the populations sampled, suggesting the existence of population substructuring. Estimates of divergence between species range from 2.46 ± 0.72% in the coho–chinook salmon comparison to 6.88 ± 1.27% between coho and chum salmon. The phylogenetic relationship among these species, based on the levels of sequence divergence, organizes the species into three distinct groups. One group includes the pink and chum salmon while a second group contains the coho and chinook salmon, as well as the rainbow trout. The sockeye salmon are distinct from both groups. Although most of these results are in accordance with classical analyses, the relationship of the rainbow trout to the coho and chinook salmon suggests different interpretations of the evolution of life histories and morphological traits in these closely related species.

Life-histories and Habits of the Clover Mite, Bryobia praetiosa Koch, and the Brown Mite, B. arborea M. & A., in British Columbia (Acarina: Tetranychidae)

1958 ◽  
Vol 90 (1) ◽  
pp. 23-42 ◽  
Author(s):  
N. H. Anderson ◽  
C. V. G. Morgan
Keyword(s):  
British Columbia ◽  
Life History ◽  
Host Plant ◽  
Related Species ◽  
Life Histories ◽  
Morphological Characters ◽  
Morphological Evidence ◽  
Ecological Data ◽  
Closely Related Species ◽  
Host Plant Specificity

Bryobia praetiosa Koch (1836) was formerly regarded as a complex of closely related species or races similar in morphological characters but varying widely in life-history, host plant specificity, and habits. The authors (30) have recently shown that two species, the clover mite, B. praetiosa Koch, and the brown mite, B. arborea Morgan and Anderson, can be distinguished in British Columbia on the basis of morphological characters. This paper presents ecological data in support of the morphological evidence.

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