Age, Growth, Population Structure and Reproductive Potential of a Vulnerable Freshwater Mullet, Rhinomugil corsula (Hamilton, 1822) from a Tropical River Betwa in Central India

AbstractIn a globalized world, parasites are often brought in contact with new potential hosts. When parasites successfully shift host, severe diseases can emerge at a large cost to society. However, the evolutionary processes leading to successful shifts are rarely understood, hindering risk assessment, prevention, or mitigation of their effects. Here, we screened populations of Varroa destructor, an ectoparasitic mite of the honeybee genus Apis, to investigate their genetic structure and reproductive potential on new and original hosts. From the patterns identified, we deduce the factors that influenced the macro- and microevolutionary processes that led to the structure observed. Among the mite variants identified, we found two genetically similar populations that differed in their reproductive abilities and thus in their host specificity. These lineages could interbreed, which represents a threat due to the possible increased virulence of the parasite on its original host. However, interbreeding was unidirectional from the host-shifted to the nonshifted native mites and could thus lead to speciation of the former. The results improve our understanding of the processes affecting the population structure and evolution of this economically important mite genus and suggest that introgression between shifted and nonshifted lineages may endanger the original host.

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Elver Invasion, Population Structure and Growth of Marbled eels Anguilla marmorata in a Tropical River on Réunion Island in the Indian Ocean

Environmental Biology of Fishes ◽

10.1023/b:ebfi.0000005761.51686.f7 ◽

2003 ◽

Vol 68 (4) ◽

pp. 339-348 ◽

Cited By ~ 6

Author(s):

Tony Robinet ◽

Sylvie Guyet ◽

Gérard Marquet ◽

Béatrice Mounaix ◽

Jean-Michel Olivier ◽

...

Keyword(s):

Population Structure ◽

Indian Ocean ◽

Reunion Island ◽

Tropical River ◽

Anguilla Marmorata ◽

Réunion Island ◽

The Indian Ocean

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Modelling the selective effects of fishing on reproductive potential and population structure of squid

ICES Journal of Marine Science ◽

10.1006/jmsc.1994.1031 ◽

1994 ◽

Vol 51 (3) ◽

pp. 299-313 ◽

Cited By ~ 6

Author(s):

E Murphy

Keyword(s):

Population Structure ◽

Reproductive Potential ◽

Selective Effects

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Modeling sources of variation for growth and predatory demand of Lake Erie walleye (Stizostedion vitreum), 1986-1995

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f98-193 ◽

1999 ◽

Vol 56 (4) ◽

pp. 527-538 ◽

Cited By ~ 27

Author(s):

Mark W Kershner ◽

Denise M Schael ◽

Roger L Knight ◽

Roy A Stein ◽

Elizabeth A Marschall

Keyword(s):

Population Structure ◽

Lake Erie ◽

Prey Availability ◽

Reproductive Potential ◽

Specific Consumption ◽

Stizostedion Vitreum ◽

Central Basin ◽

Western Basin ◽

Variable Nature ◽

Sources Of Variation

Given the variable nature of the Lake Erie ecosystem, we investigated biotic and abiotic sources of variation for walleye (Stizostedion vitreum) growth, consumption, and population-wide predatory demand. We determined how temperature, population structure, and age-specific consumption influenced walleye growth and consumption during 1986-1995. For each year, we used individual-based bioenergetics modeling to compare growth and consumption by walleye in Lake Erie's western or central basin with those of walleye moving seasonally between basins. Population structure strongly affected walleye growth and consumption but had little influence on interbasin growth rate comparisons. Based on water temperature alone, growth and consumption by western basin walleye were generally lower than for central basin or migratory populations and were more limited by summer water temperatures. In simulations combining effects of population structure, temperature, and age-specific consumption, migratory walleye grew most rapidly, taking advantage of temperature-related growth peaks in both basins. Estimates of walleye predatory demand declined with population size from 1988 through 1995. With natural feedbacks, predatory demand interacts with prey production, limiting walleye reproductive potential when prey availability is low. However, immediate impact on predatory inertia is limited, complicating our ability to predict how predatory demand and prey availability interact in Lake Erie.

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Population structure of Nile tilapia and its impact on fisheries of a tropical impacted reservoir, Central India

Environmental Science and Pollution Research ◽

10.1007/s11356-020-09234-w ◽

2020 ◽

Vol 27 (23) ◽

pp. 29091-29099

Author(s):

Canciyal Johnson ◽

Uttam Kumar Sarkar ◽

Sathis Kumar Koushlesh ◽

Archan Kanti Das ◽

Basanta Kumar Das ◽

...

Keyword(s):

Population Structure ◽

Nile Tilapia ◽

Central India

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Length-weight relationships (LWRs) of 12 Indian freshwater fish species from an un-impacted tropical river of Central India (River Ken)

Journal of Applied Ichthyology ◽

10.1111/j.1439-0426.2012.02005.x ◽

2012 ◽

Vol 28 (5) ◽

pp. 854-856 ◽

Cited By ~ 4

Author(s):

V. K. Dubey ◽

U. K. Sarkar ◽

R. S. Kumar ◽

J. I. Mir ◽

A. Pandey ◽

...

Keyword(s):

Freshwater Fish ◽

Fish Species ◽

Central India ◽

Tropical River ◽

Freshwater Fish Species

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Edge effect on the population structure and the reproductive success of two Bursera species

Botanical Sciences ◽

10.17129/botsci.775 ◽

2017 ◽

Vol 95 (1) ◽

pp. 9 ◽

Cited By ~ 2

Author(s):

Humberto Suzán-Azpiri ◽

Oscar O Ponce-González ◽

Guadalupe X. Malda-Barrera ◽

Victor H. Cambrón-Sandoval ◽

Israel G. Carrillo-Angeles

Keyword(s):

Population Structure ◽

Reproductive Success ◽

Solar Radiation ◽

Edge Effect ◽

Environmental Conditions ◽

Soil Compaction ◽

Deciduous Forest ◽

Initial Conditions ◽

Reproductive Potential ◽

Tropical Deciduous Forest

Background: Environmental conditions in edges of vegetation fragments affect life cycle characteristics of the native biota (edge effect). We evaluated the edge effect on two Bursera species, which are representative of the mature community of the tropical deciduous forest (TDF) in Mexico.Hypothesis. We expected a population structure reflecting the affectation to reproduction, survival and growth in the edges of TDF fragments.Studied species: Bursera fagaroides, B. Palmeri.Study site and years of study: Querétaro (Qro.), Apaseo el Grande (Gto.), México. Field survey: May-September 2012.Methods: Within each of nine TDF fragments, we drew plots in two environmental contrasting conditions (edge and interior), between which we compared the density, population structure and reproductive success of the two Bursera species, as well as estimators of the solar radiation and soil compaction.Results: Solar radiation and soil compaction were not different between environmental conditions. In both species density of individuals was larger in the edge, where individuals with middle and large sizes were predominant. Reproductive potential of individuals, and the viability and germination of their seeds were similar between edge and core environments.Conclusions: Density and population structure showed a congruent variation with higher rates of recruitment, growth and survival in the edge environment, which could have been present under initial conditions of greater incidence of radiation in the edges. The similarity currently observed in the solar radiation between edge and core areas of fragments, could be a result of the fast recovery of the canopy under conditions of higher light incidence in edges.

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