2 edition of On summer-breeding in populations of Pontoporeia affinis (Crustacea Amphipoda) living in lakes of North America found in the catalog.
On summer-breeding in populations of Pontoporeia affinis (Crustacea Amphipoda) living in lakes of North America
Sven Gustaf SegerstraМЉle
Bibliography: p. 16-18.
|Statement||Sven G. Segerstråle.|
|Series||Commentationes biologicae -- 44|
|The Physical Object|
|Pagination||18 p. ;|
|Number of Pages||18|
Secondary production of the amphipod Synchelidium lenorostralum was examined on a temperate sandy shore, southern Korea, on the basis of monthly samples from July to June Secondary production was estimated by the size-frequency method. Biomass structure showed two peaks in fall and spring, with maximum biomass in April. Biomass in the spring breeding period was higher than that in Normally the M. affinis populations show cyclic fluctuations in the Gulf of Bothnia covering years. However, in a dramatic decline started on coastal stations in the Gulf of Bothnia and during and the decline was extended to the southern and central stations and principally all stations were affected (Karlsson and
Currently, sturgeon are considered rare, and many populations have completely disappeared from their historical breeding grounds (Murawski and Pacheco, ). Deteriorating water quality and prolific damming (preventing access of sturgeon to spawning sites) are also blamed for the precipitous decline in abundance (U.S. Army Corps of Engineers Example scenarios of adaptive and non‐adaptive reaction norms in response to colonization of new environments. (see also van Tienderen , ) Phenotypic values in the native site are indicated with filled represent the phenotype that genotype would express if
During the last two decades, a growing body of evidence indicates that amphibian populations on several continents are declining at an unusually high rate (Blaustein et al. , Houlahan et al. ) and in , the IUCN Red Data Book designated amphibians as the most threatened group of vertebrates (Baillie et al. ). The reproductive biology of Arenaeus cribrarius from Ubatuba, São Paulo State, Brazil, was studied. Swimming crabs were sampled monthly for two years with otter trawls in two bays. A total of males and 1, females were examined. Mating took place mainly in autumn involving postmolt females and intermolt males. At that time, gonad regression was verified in adult males, due to
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The reproduction of Pontoporeia affinis in summer is reported for the first time from the Baltic Sea; all earlier data from this basin, as well as from other Eurasian marine and lacustrine waters, have indicated reproduction during the colder months.
The Baltic material concerned originates from localities situated in the Gulf of Bothnia at more than m :// FURTHER DATA ON SUMMER-BREEDING IN BALTIC POPULATIONS OF THE AMPHIPODS PONTOPOREIA AFFINIS AND P. FEMORATA, WITH COMMENTS ON THE TIMING PROBLEM INVOLVED Sven G.
Segerstrâle Institute of Marine Research, Helsinki/Helsingf Finland ** In a paper ofthe author demonstrated that in Baltic populations of Sisältää myös kaksi muuta artikkelia: Sven G. Segerstråle: Further data on summer breeding in Baltic populations of the amphipods Pontoporeia affinis and P.
femorata, with comments on the timing problem involved S. Uusitalo: Numerical investigations of the influence of wind on water levels and currents in the Gulf of Bothnia: A preliminary experiment Abstract. Sisältää myös kaksi muuta artikkelia: Sven G.
Segerstråle: Further data on summer breeding in Baltic populations of the amphipods Pontoporeia affinis and P. femorata, with comments on the timing problem involved S. Uusitalo: Numerical investigations of the influence of wind on water levels and currents in the Gulf of Bothnia: A preliminary experimen S.G.
SegerstråleObservations of summer-breeding in populations of the glacial relict Pontoporeia affinis Lindstr. (Crustacea Amphipoda), living at greater depths in the Baltic Sea, with notes on the reproduction of P.
femorata Kröyer Segerstråle, S. Observations on summer-breeding in populations of the glacial relictPontoporeia affinis Lindstr. (Crustacea, Amphipoda), living at greater depths in the Baltic Sea, with notes on the reproduction onP.
femorata Kröyer. exp. mar. Biol. Ecol. 1: 55–64 Google Scholar Observations of summer-breeding in populations of the glacial relict Pontoporeia affinis lindstr.
(Crustacea Amphipoda), living at greater depths in the Baltic sea, with notes on the reproduction of P. Femorata Kröyer.
Sven G. Segerstråle. Pages Download PDF. Article :// Importance of algae in the diet of subartic populations of Gammarus lacustris and Pontoporeia affinis Article in Canadian Journal of Zoology 55(3) February with 8 Reads Pontoporeia populations in the northern Baltic Sea Anna Uittol & Jouko Sarvala ITvärminne Zoological Station, University of Helsinki, SF-l() Hanko, Finland 2Department of Biology, University of Turku, SF() Turku, Finland The deposit-feeding Pontoporeia affinis Observations of summer-breeding in populations of the glacial relict Pontoporeia affinis Lindström (Crustacea Amphipoda), living at the greater depths in the Baltic sea, with notes on the reproduction of P.
femorata Kröyer. Exp. Mar. Biol. Ecol. Segerstråle, S. Light control of the reproductive cycle of Pontoporeia Segerstrale, S. G.,Observations of summer breeding in populations of the glacial relict Pontoporeia affinis Lindstr.
(Crustacea, Amphipoda) living at greater depths in the Baltic sea, with notes on the reproduction of P. femorata Kröyer, J. Exp. Mar. Biol. Ecol. 1: 55 - CrossRef Google Scholar The life history and feeding habits of Pontoporeia affinis Lindström were studied in mesotrophic Lake Erken during to The greatest densities and biomasses of P.
affinis occurred at 12 m ( ind./m2 and mg dw/m2, respectively) with values decreasing at the shallower and deeper regions. The life cycle of Pontoporeia was one year, with recruitment occurring in April, at which PontoPoreia affinis Lindström is an ecologically (Segerstråle ).
Hence summer breeding is also observed in populations at depths exceeding m in the Baltic Sea, where these of P. affinis was based on the same principle as that developed Despite significant decreases and fluctuations in population sizes, the demographic history of M.
affinis populations is best described by a model of constant population size over time, suggesting Abstract. Several lines of evidence suggest that the Lake Michigan benthic amphipod, Pontoporeia hoyi (an important fish prey in large, temperate, low-nutrient lakes), may obtain a large portion of its annual energy directly from the spring diatom bloom: 1) Energetic considerations suggest that P.
hoyi must assimilate a large fraction of energy from incoming organic material, but that summer Further data on summer breeding in baltic populations of the amphipod Pontoporeia affinis and P_.
femorata, with comments on the timing problems involved. Merentutkimuslait Tulk., Hausforskninginst. Skr. SegerstrHle, Sven G., c. The distribution and morphology of Pontoporeia affinis ?Dockey=TXT.
After leaving the baygall we traveled east to a wetland pine savannah where we found the enigmatic Chapman’s Fringed Orchid (Platanthera chapmanii). chapmanii occurs in scattered populations in Texas, Mississippi, Florida, Georgia, and North Carolina. It is believed by many to have arisen from an ancient hybrid of P.
cristata and P. cilliaris, seeming to display characteristics of :// This means that affinis appears to be incorrectly used for eastern populations of nilotica migrating through southern Asia and the birds we see are probably nilotica.
Mathews named the breeding birds in China as addenda, which makes things a little more Abstract. The physical and chemical characteristics of the sediment-water interface greatly influence distributions of the bottom-feeding amphipod Pontoporeia hoyi which is a major component of the Great Lakes aquatic food-webs.
Sediment-water interface samples from the Great Lakes indicate that Pontoporeia densities are positively correlated with sediment concentrations of organic carbon Mosquito control manages the population of mosquitoes to reduce their damage to human health, economies, and enjoyment.
Mosquito control is a vital public-health practice throughout the world and especially in the tropics because mosquitoes spread many diseases, such as malaria and the Zika virus. Mosquito-control operations are targeted against three different problems:. The effects of the amphipod Pontoporeia affinis and of exposure to Cd at 0 (control) and 5, 50 and μg l-1 on a meiofauna population were studied in small, flow-through laboratory ://Read "Geographical variability in the bioenergetic characteristics of Monoporeia/Pontoporeia spp.
populations from the northern Baltic Sea, and their potential contribution to benthic nitrogen mineralization, Marine Biology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your :// The mean estimated population size for R.
affinis in Gua Kepala Gajah was individuals and in Gua Tongkat. The population size of R. affinis showed an obvious decline during the breeding season and increased gradually after that for both caves. Pregnant R. affinis were found in April and lactating in June in both caves.