Overview

Brief Summary

The family Poeciliidae is comprised of mostly small-bodied fishes (of which Belonesox is the largest) that have internal fertilization by means of the male gonopodium (modified anal rays 3-5) and bear live young. Poeciliids are generally the most dominant fishes in lowland fresh and brackish waters of Middle America and the West Indies, ranging from the eastern U.S.A. to northeastern Argentina. Many popular aquarium fishes (e.g., Swordtails, Guppies, Mollies) are poeciliids, as well as the ubiquitous Mosquitofish (Gambusia spp.).

  • Miller, R. R. 2005. Freshwater Fishes of Mexico. University of Chicago Press, Chicago, Illinois
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Ecology

Associations

Known predators

Poeciliidae (Poeciliidae (2 common species)) is prey of:
Ardeidae
Alcedinidae

Based on studies in:
Panama, Gatun Lake (Lake or pond)

This list may not be complete but is based on published studies.
  • T. M. Zaret and R. T. Paine, Species introduction in a tropical lake, Science 182:449-455 (1973), from p. 452.
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Known prey organisms

Poeciliidae (Poeciliidae (2 common species)) preys on:
Insecta

Based on studies in:
Panama, Gatun Lake (Lake or pond)

This list may not be complete but is based on published studies.
  • T. M. Zaret and R. T. Paine, Species introduction in a tropical lake, Science 182:449-455 (1973), from p. 452.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records: 1397
Specimens with Sequences: 1033
Specimens with Barcodes: 1014
Species: 117
Species With Barcodes: 113
Public Records: 394
Public Species: 59
Public BINs: 67
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Barcode data

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Wikipedia

Poeciliidae

Poeciliidae is a family of freshwater fishes of the order Cyprinodontiformes, the tooth-carps, and include well-known live-bearing aquarium fish, such as the guppy, molly, platy, and swordtail. The original distribution of the family was the southeastern United States to north of Rio de la Plata, Argentina, and Africa, including Madagascar. However, due to release of aquarium specimens and the widespread use of species of the genera Poecilia and Gambusia for mosquito control, poeciliids can today be found in all tropical and subtropical areas of the world. In addition, Poecilia and Gambusia specimens have been identified in hot springs pools as far north as Banff, Alberta.[1]

Live-bearing[edit]

Although the whole family Poeciliidae is known as "live bearers" (viviparous), some species are egg-scattering with external fertilization. All African species are egg-layers, and (with the exception of the members of the genus Tomeurus) all American species are live-bearers. Among the three subfamilies, Aplocheilichthyinae is restricted to Africa, Poeciliinae is primarily from the Americas (the only exception is the African Rhexipanchax), and Procatopodinae is mainly from Africa (the South American Fluviphylax and Pseudopoecilia are the only exceptions). This distribution suggests that the Poeciliidae predate the split between Africa and South America 100 million years ago, and that live-bearing subsequently evolved in South America. Poeciliids colonized North America through the Antilles while they were connected 44 million years ago. Poeciliids then moved to Central America by the Aves land bridge on the Caribbean Plate. When South America connected to Central America three million years ago, some further dispersal southward occurred, but South American species did not move into Central America.[2]

Among the live-bearing species, differences in the mode and degree of support the female gives the developing larvae occur. Many members of the family Poeciliidae are considered to be lecithotrophic (the mother provisions the oocyte with all the resources it needs prior to fertilization, so the egg is independent of the mother), but others are matrotrophic (literally "mother feeding": the mother provides the majority of resources to the developing offspring after fertilization).

Members of the genus Poeciliopsis, for example, show variable reproductive life history adaptations. Poeciliopsis monacha, P. lucida, and P. prolifica form part of the same clade within that genus. However, their modes of maternal provisioning vary greatly. P. monacha can be considered to be lecithotrophic because it does not really provide any resources for its offspring after fertilization - the pregnant female is basically a swimming egg sac. P. lucida shows an intermediate level of matrotrophy, meaning that to a certain extent the offspring's metabolism can actually affect the mother's metabolism, allowing for increased nutrient exchange. P. prolifica is considered to be highly matrotrophic, and almost all of the nutrients and materials needed for fetal development are supplied to the oocyte after it has been fertilized. This level of matrotrophy allows Poeciliopsis to carry several broods at different stages of development, a phenomenon known as superfetation. Because the space for developing embryos is limited, viviparity reduces brood size. Superfetation can compensate for this loss by keeping embryos at various stages and sizes during development.[3]

P. elongata, P. turneri and P. presidionis form another clade which could be considered an outgroup to the P. monacha, P.lucida, and P. prolifica clade. These three species are very highly matrotrophic - so much so that in 1947, C. L. Turner described the follicular cells of P. turneri as "pseudo-placenta, pseudo-chorion, and pseudo-allantois".[citation needed]

One week fry of Poecilia reticulata (guppy)

References[edit]

  1. ^ http://srd.alberta.ca/FishWildlife/FisheriesManagement/documents/CostsAndThreatsOfInvasiveSpeciesInAlberta-Mar-04.pdf
  2. ^ Hrbek, T., J. Seekinger, and A. Meyer. 2007. A phylogenetic and biogeographic perspective on the evolution of poeciliid fishes. Molecular Phylogenetics and Evolution 43:986-998.
  3. ^ Thibault, R. E., and R. J. Schultz. 1978. Reproductive adaptations among viviparous fishes (Cyprinodontiformes Poeciliidae). Evolution 32:320-333.
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