Population genetics features of an invasive Tunicate time series samples in a central Californian marina

Karahan, Arzu
Paz, Guy
Rinkevich, Baruch
Despite their simple appearance, the tunicates (accepted as ancestors group to the Chordata) are marine vertebrate animals. Some tunicates live as solitary individuals, but others replicate by budding and become colonies. Most adult tunicates are sessile and others swim in the pelagic zone. The earliest unequivocal species of tunicate appeared in the fossil records in the early Cambrian period. Over the past few decades, some tunicates have been invading coastal waters in many countries. We introduce here one of the invasive colonial Tunicates Botryllus schlosseri. The Botryllus schlosseri population of the Elkhorn Yacht Club (EYC) harbor, CA, USA was repeatedly sampled over a 12-yr period (1996-2008), in addition to a single sampling (2001) of five other USA west-coast populations (from Washington and California). High numbers of unique alleles were identified. The most common microsatellite alleles, whilst being prominent throughout the entire period, fluctuated between the different sampling dates. Three clusters emerged when considering all 12 west-coast sites/samples according to the non-coding region. COI revealed two clades and 13 haplotypes (EYC). These results not only provide valuable insights into the dynamics of Botryllus dispersal at the local (EYC area) and USA but also reflect major changes within less than a year in microsatellite allele frequencies.


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The genetic diversity and phylogeography of maternal lineages in Ursus arctos Linnaeus, 1758 (the brown bear) have been studied extensively over the last two decades; however, sampling has largely been limited to the northern Holarctic, and was possibly biased towards lineages that recolonized the vast expanses of the north as the Last Glacial Maximum (LGM) ended. Here we report the genetic diversity and phylogeography of U.arctos from Turkey based on 35 non-invasive samples, including five from captive ind...
Citation Formats
A. Karahan, G. Paz, and B. Rinkevich, “Population genetics features of an invasive Tunicate time series samples in a central Californian marina,” presented at the Ecology and Evolutionary Biology Symposium Turkey (EEBST) (2015), 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/70934.