+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Gonad maturation as an indication of seasonal cycles for several species of small copepods in the barents sea

, : Gonad maturation as an indication of seasonal cycles for several species of small copepods in the barents sea. Polar Research 10(2): 421-432

In a remote oceanic area like the Barents Sea, it is often different to follow the seasonal developmet of copepod populations in detail. Information on the gonad maturation stage of older juveniles and adults of a species will reveal the immediated state of reproduction and the expected development of juveniles into reproductively active adults. Winter "resting stages" in juveniles can be recognised. Zooplankton were caught during Pro Mare cruises in early March, May, July/August, mid-September and mid-October. Abundance and composition of developmental stages of small copepods were determined for several stations from each cruise. Samples consisting of Stages CIV to CVI of Pseudocalanus acuspes (Giesbrecht 1881), P. minutus (Kroyer), Microcalanus pusillus (Sars), and M. pygmaeus Sar were stained with carmine and analysed with respect to gonad maturation stage, length, width, and area of the prosome and the area of the gonad and the oil sac. Image analysis were performed from photographs or drawing s of copepods using a digitising pad. With additional information on abundance and stage composition, and by comparing the present data set with information on Pseudocalanus spp. from Balsfjorden, northern Norway, seasonal cycles for the species could be inferred.


DOI: 10.1111/j.1751-8369.1991.tb00663.x

Other references

Green, D.; Hartwig, D.; Chen, D.; Soltysik, R.C.; Yarnold, P.R., 2003: Spinal Cord Injury Risk Assessment for Thromboembolism (SPIRATE Study). Venous thromboembolism (VTE) occurs in up to a third of patients with spinal cord injury (SCI) and pulmonary embolism is the third leading cause of death. In this study, we identified risk factors for VTE during the rehabilitatiion phase of SCI. W...

Haymon Rachel M.; Macdonald Ken C., 1985: The geology of deep-sea hot springs. American Scientist 73(5): 441-449

Van D.V.orde, J.; Brochez, V.; Vanheel, B., 1994: Heterogenous effects of histamine on isolated rat coronary arteries. The influence of increasing concentrations of histamine (0.1 mu-M-1 mM) was studied on proximal and distal ring segments of left anterior descendens coronary arteries isolated from rats. Addition of histamine to prostaglandin F-2alpha (10 mu-M)-pr...

Metzel, E.; Hemmer, R., 1962: Transbasal penetrating injury caused by bolts. Monatsschrift für Unfallheilkunde und Versicherungsmedizin 65: 81-84

Singh, K.P.; Angiras, N.N., 2004: Sensitivity of newly released varieties of rice to herbicides. A field experiment was carried out during Kharif 1999 at experimental farm of CSK HPKV Palampur to check the sensitivity of newly released varieties to herbicides in direct seeded puddled rice. Experiment was conducted in randomized block design w...

McBride J.H., 1982: Application of detailed continuation and derivative gravity processing in subsurface structural analysis; Arkoma Basin. Using precision gravity data from a test area of the Arkoma basin, detailed continuation and derivative gravity field maps have been constructed. This study demonstrates further the utility of such work in refining existing knowledge of subsurface...

Kent, H., 1961: Tax rules on exemptions for dependents. Journal of the American Podiatry Association 51: 48-50

Nakanuma Y.; Kono N., 1991: Expression hla dr antigens on interlobular bile ducts in primary biliary cirrhosis and other hepatobiliary diseases an immunohistochemical study. Using a monoclonal antibody to .alpha. chains of HLA-DR antigens, we found that damaged biliary epithelial cells in primary biliary cirrhosis (PBC) and, to a lesser degree and frequency, in other hepatobiliary diseases expressed HLA-DR antigens, w...

Turpin, K.M.; Lapen, D.R.; Gregorich, E.G.; Topp, G.C.; McLaughlin, N.B.; Curnoe, W.E.; Robin, M.J.L., 2003: Application of multivariate adaptive regression splines (MARS) in precision agriculture. Water quality is a major concern. Some agricultural practices can contribute to the degradation of water quality, particularly when fertilizers are not used efficiently. In order to properly manage nitrogen in maize production systems, the factors...

Bitalac L.P.; Paja P.A.; Recio B.V.; Tinao L.V.; Tolentino F.C., 1988: The screening and stability studies of plant pigments. A simple and rapid systematic screening procedure was devised to screen for colored constituents such as flavonoids, anthraquines, carotenoids and their derivatives in selected plant materials. The proposed screening method detected similar colore...