Topic
Serolis
About: Serolis is a research topic. Over the lifetime, 29 publications have been published within this topic receiving 402 citations.
Papers
TL;DR: The results of this study indicate limited gene flow between distant populations of the brooding isopod Serolis paradoxa, and suggest that the only recently inundated Strait of Magellan was colonized by different source populations, most likely from Atlantic and Pacific coastal waters.
Abstract: The Falkland Islands and Patagonia are traditionally assigned to the Magellan Biogeographic Province. Most marine species in Falkland waters are also reported from southern Patagonia. It remains unclear if relatively immobile, marine benthic, shallow-water species maintain gene flow, and by what mechanism. Recurrent fluctuations in sea level during glacial cycles are regarded as a possible mechanism that might have allowed genetic exchange between the regions. However, the realized genetic exchange between the Falkland Islands and Patagonia has never been estimated. This study analyses the genetic structure of three populations of the marine shallow-water isopod Serolis paradoxa (Fabricius, 1775) from the Falkland Islands and southern Patagonia (central Strait of Magellan and the Atlantic opening) applying seven nuclear microsatellites and a fragment of the mitochondrial 16S rRNA gene. Both marker systems report highest genetic diversity for the population from the central Strait of Magellan and lowest for the Falkland Islands. The estimated effective population sizes were large for all populations studied. Significant differentiation was observed among all three populations. The magnitude of differentiation between Patagonia and the Falkland Islands (16S: uncorrected p-distance 2.1%; microsatellites: standardized F'ST > 0.86) was an order of magnitude higher than between populations from within Patagonia. This indicates that there is currently no effective gene flow for nominal S. paradoxa between these two regions and it has been absent for time exceeding the last glacial maximum. We argue that specimens from the Strait of Magellan and the Falkland Islands very likely represent two distinct species that separated in the mid-Pleistocene (about 1 MY BP). The results of this study indicate limited gene flow between distant populations of the brooding isopod Serolis paradoxa. The patterns of genetic diversity suggest that the only recently inundated Strait of Magellan was colonized by different source populations, most likely from Atlantic and Pacific coastal waters. Our results demonstrate that more systematic testing of shared faunal inventory and realized genetic exchange between Patagonia and the Falkland Islands is needed before a consensus concerning the position of the Falkland Islands relative to the Magellan zoogeographic province can be reached.
68 citations
TL;DR: The growth of Antarctic species of Serolis is compared with that of temperate isopods, and it is found that the former tend to show larger body size, slower growth, and greater longevity than the former, which is considered to be due to reduced food availability.
41 citations
1 Jan 1984
22 citations
1 Jan 1985
TL;DR: A population of the predatory benthic isopod Serolis polita was studied at Signy Island, South Orkney Islands, for 2 consecutive years, and energy consumption was found to be markedly seasonal with the majority of growth and reproductive output occurring in the summer.
Abstract: A population of the predatory benthic isopod Serolis polita was studied at Signy Island, South Orkney Islands, for 2 consecutive years. Field observations of population structure, growth rate and reproductive biology were complemented by laboratory measurements of respiratory rate and assimilation efficiency, and used to construct a computer model of the energy expenditure of all sections of the population. The complete annual energy budget (in kJ m−2 yr−1) was calculated as Consumption (289) = Production (115) + Respiration (108) + Faeces (58) + Excretion (9), with a mean biomass of 113 kJ m−2. Energy consumption was found to be markedly seasonal with the majority of growth and reproductive output occurring in the summer. Total energy consumption was lower in winter with respiratory costs predominating. The relatively high assimilation efficiency (80%) on a diet of amphipods and polychaetes is characteristic of other isopods, but the gross growth efficiency (40%) and the net growth efficiency (52%) are surprisingly high in view of the organism’s 4-yr life cycle. The ecological implications of this are discussed. The turnover rate (P/B) is low (1.02) in comparison with other marine isopods studied, and is considered to be related to the large body size. This is discussed as a general feature of the Antarctic marine ecosystem and may help to explain the observed high biomasses without the need to infer unusually high productivity.
19 citations
TL;DR: Dans ce travail est decrite la coloration cryptique protectrice presentee par les femelles and les mâles adultes des especes Serolis laevis et S. polaris.
Abstract: Dans ce travail est decrite la coloration cryptique protectrice presentee par les femelles et les mâles adultes des especes Serolis laevis et S. polaris. La signification et l'importance de cette coloration pour les especes etudiees sont discutees.
12 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2010 | 1 |
| 2009 | 1 |
| 2008 | 2 |
| 2003 | 1 |
| 2000 | 1 |
| 1991 | 1 |