scholarly journals Жизненные стратегии равноногих ракообразных в условиях черноморского сообщества обрастания

2015 ◽  
Vol 23 (2) ◽  
Author(s):  
A. Y. Varigin
Keyword(s):  
Idotea Balthica

Рассмотрены характерные черты жизненных стратегий двух массовых видов равноногих ракообразных Idotea balthica basteri (Pallas, 1772) и Lekanesphaera monodi (Arcangeli, 1934), совместно обитающих в сообществе обрастания прибрежной зоны Одесского залива Черного моря. Отмечена сбалансированность межвидовых отношений изучаемых видов в данном сообществе. Их конкурентные отношения носили диффузный характер, отражающий относительно слабые по силе межвидовые взаимодействия. Экологические ниши этих видов перекрывались лишь по местообитанию. По трофическим и временным характеристикам конкуренция между ними ослаблена. Отмечена эффективность жизненных стратегий обоих видов ракообразных, что подтверждается их массовостью в сообществе обрастания Одесского залива Черного моря.

scholarly journals Effects of temperature on carbon circulation in macroalgal food webs are mediated by herbivores

2019 ◽  
Vol 166 (12) ◽  
Author(s):  
Maysa Ito ◽  
Marco Scotti ◽  
Markus Franz ◽  
Francisco R. Barboza ◽  
Björn Buchholz ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Food Web ◽  
Food Webs ◽  
Carbon Storage ◽  
Primary Productivity ◽  
Idotea Balthica ◽  
Metabolic Performance ◽  
The Baltic ◽  
Organic Carbon Storage ◽  
Temperature Impacts

Abstract Warming is one of the most dramatic aspects of climate change and threatens future ecosystem functioning. It may alter primary productivity and thus jeopardize carbon sequestration, a crucial ecosystem service provided by coastal environments. Fucus vesiculosus is an important canopy-forming macroalga in the Baltic Sea, and its main consumer is Idotea balthica. The objective of this study is to understand how temperature impacts a simplified food web composed of macroalgae and herbivores to quantify the effect on organic carbon storage. The organisms were exposed to a temperature gradient from 5 to 25 °C. We measured and modeled primary production, respiration, growth and epiphytic load on the surface of Fucus and respiration, growth and egestion of Idotea. The results show that temperature affects physiological responses of Fucus and Idotea separately. However, Idotea proved more sensitive to increasing temperatures than the primary producers. The lag between the collapse of the grazer and the decline of Fucus and epiphytes above 20 °C allows an increase of carbon storage of the primary productivity at higher temperatures. Therefore, along the temperature gradient, the simplified food web stores carbon in a non-monotonic way (reaching minimum at 20 °C). Our work stresses the need of considering the combined metabolic performance of all organisms for sound predictions on carbon circulation in food webs.

scholarly journals Inventory of organisms interfering with transmission of a marine trematode

2014 ◽  
Vol 94 (4) ◽  
pp. 697-702 ◽  
Author(s):  
Jennifer E. Welsh ◽  
Jaap van der Meer ◽  
Corina P.D. Brussaard ◽  
David W. Thieltges
Keyword(s):  
Crassostrea Gigas ◽  
Wadden Sea ◽  
Dilution Effect ◽  
Crangon Crangon ◽  
Trematode Parasite ◽  
Free Living ◽  
Marine Systems ◽  
Time Period ◽  
Idotea Balthica ◽  
Dilution Effects

It has increasingly been recognized that organisms can interfere with parasitic free-living stages, preventing them from infecting their specified host and thus reducing infection levels. This common phenomenon in freshwater and terrestrial systems has been termed the ‘dilution effect’ and, so far, is poorly studied in marine systems. Ten common intertidal organisms found in the Dutch Wadden Sea (North Sea) were tested to establish their effects on the free-living cercarial stages of the trematode parasite Himasthla elongata. Most species tested resulted in a significant reduction in cercariae over a 3 hr time period. The amphipod Gammarus marinus removed 100% of the cercariae, while other effective diluters were Crangon crangon (93%), Sargassum muticum (87%), Semibalanus balanoides (71%), Crassostrea gigas (67%), Hemigrapsus takanoi (>54%), Crassostrea gigas shells (44%) and Idotea balthica (24%). In contrast, mixed shells (Cerastoderma edule, Mytilus edulis, Ensis americanus and Littorina littorea) and Fucus versiculosus had no significant effect. These results suggest that dilution effects are widespread in the trematode of H. elongata, with potentially strong effects on its population dynamics.

scholarly journals An Evaluation of Cryptic Lineages of Idotea Balthica (Isopoda: Idoteidae): Morphology and Microsatellites

2007 ◽  
Vol 27 (4) ◽  
pp. 643-648 ◽  
Author(s):  
John P. Wares ◽  
Robert J. Toonen ◽  
Regina Wetzer ◽  
Sarah Daley
Keyword(s):  
Idotea Balthica

scholarly journals Species of marine Isopoda (Crustacea, Peracarida) from southern Brazil

1972 ◽  
Vol 21 (0) ◽  
pp. 163-179 ◽  
Author(s):  
Plínio Soares Moreira
Keyword(s):  
Shallow Water ◽  
Rio De Janeiro ◽  
Geographical Range ◽  
Southern Brazil ◽  
Idotea Balthica

Some species of marine Isopoda collected in southern Brazil mostly in shallow-water and amongst seaweeds are studied. Five species are discussed and illustrated. A diagnosis is given for each species. Idotea metallica and Synidotea marplatensis are new oc currences for the area, and both have had their geographical range extended to off Rio de Janeiro. The presence of Idotea balthica and Erichsonella filiformis in southern Brazil was definitely asserted. Illustrations of both sexes of Rocinela signata and details about its occurrence in the region surveyed were made.

Reckless males, rational females: Dynamic trade-off between food and shelter in the marine isopod Idotea balthica

2008 ◽  
Vol 79 (3) ◽  
pp. 175-181 ◽  
Author(s):  
Outi Vesakoski ◽  
Sami Merilaita ◽  
Veijo Jormalainen
Keyword(s):  
Trade Off ◽  
Idotea Balthica
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