A study of the feeding habits of larvae of limnephilus marmoratus curtis (trichoptera) living in the fucus-belt of the northern part of the baltic

Hydrobiologia ◽  
1971 ◽  
Vol 37 (2) ◽  
pp. 253-265
Author(s):  
Per Haage
Keyword(s):  
Feeding Habits ◽  
The Baltic

Ecotoxicity of contaminated sediments, a matter of bioavailability

1998 ◽  
Vol 37 (6-7) ◽  
pp. 225-231 ◽  
Author(s):  
N. H. B. M. Kaag ◽  
E. M. Foekema ◽  
M. C. Th. Scholten
Keyword(s):  
Dreissena Polymorpha ◽  
Sea Water ◽  
Feeding Habits ◽  
Macoma Balthica ◽  
Contaminated Sediments ◽  
Suspension Feeding ◽  
Simple Relationship ◽  
Filter Feeder ◽  
Arenicola Marina ◽  
The Baltic

Marine and freshwater mesocosm-scale experiments with contaminated sediments have shown that there is a direct relationship between the accumulated contaminant levels and the feeding habits of the organisms used. The highest levels of PAHs and PCBs were found in the sediment feeding lugworm Arenicola marina and in Tubifex worms. The levels of contaminants in the suspension feeding mussels Mytilus edulis and the zebra mussels, Dreissena polymorpha, were not influenced by the contaminant content of the sediments, but were related instead to the level of contaminants in the sea water above. Intermediate levels were found in the baltic tellin, Macoma balthica, which is a filter feeder as well as a deposit feeder, depending on the availability of food. These results show that there is no simple relationship between contaminant concentration in the sediments and bioavailability. Higher levels of contaminants do not necessarily lead to higher levels of these contaminants in Arenicola, due to differences in the sediment structure and the ageing of the contamination. On the other hand, toxic effects are related to the internal concentrations of certain chemicals. The internal concentrations observed in Arenicola may provide a good estimation of the true bioavailability of sedimentary contaminants and can also be used as an indicator for potential environmental effects.

On the Feeding Habits of Two Baltic Species of Caddis Larvae (Trichoptera)

1970 ◽  
Vol 1 (4) ◽  
pp. 282-290 ◽  
Author(s):  
Per Haage
Keyword(s):  
Food Choice ◽  
Main Part ◽  
Feeding Habits ◽  
Fucus Vesiculosus ◽  
Flight Period ◽  
Filamentous Algae ◽  
Larval Instars ◽  
Different Seasons ◽  
The Baltic ◽  
Special Difference

AbstractThe feeding habits of Agrypnia pagetana Curtis and Phryganea grandis L. in the rockweed-belt in the northern part of the Baltic have been investigated. The fore-guts of larvae, collected every month, except during the flight period have been analysed. The main part of the food of Agrypnia pagetana consisted of filamentous algae and fragments of Fucus vesiculosus. Phryganea grandis consumes mainly Arthropods e.g. Idotea spp. and Chironomus spp. No special difference in food choice between different seasons has been stated. The larvae consume the most accessible food. Different larval instars consume the same sort of food, but of different size. The larvae feed most actively during the autumn and in this period they also grow most and in the spring before the pupation. During the winter the fore-guts contain much less food than in the autumn.

Comparison between spring and autumn infection by Corynosoma (Acanthocephala) in the ringed seal Pusa hispida in the Bothnian Bay of the Baltic Sea

Parasitology ◽  
1981 ◽  
Vol 82 (2) ◽  
pp. 287-296 ◽  
Author(s):  
Eero Helle ◽  
E. Tellervo Valtonen
Keyword(s):  
Baltic Sea ◽  
Feeding Habits ◽  
Ringed Seal ◽  
The Other ◽  
The Baltic Sea ◽  
Rate Of Development ◽  
Ringed Seals ◽  
Pusa Hispida ◽  
The Baltic ◽  
Bothnian Bay

SUMMARYCorynosoma spp. (Acanthocephala) infection in ringed seals (Pusa hispida) is compared in spring and in autumn in the Bothnian Bay, northern Baltic Sea. The material consists of more than 13400 specimens: 7590 from the intestines of 13 seals captured in April and May 1978 and 5850 from 29 seals captured in October and November.Corynosoma strumosum infection had approximately the same intensity in spring and autumn (mean 76 and 66 individuals/infected seal, maxmum 313 and 324 individuals, respectively). C. semerme specimens, on the other hand, were 37 times more numerous in spring than in autumn (504 compared with 136/infected seal, maximum 1700 and 1230 individuals, respectively). The ratio of C. strumosum to C. semerme was 1:6·3 in spring and 1:2·0 in autumn, as calculated from the total material. Corynosoma infection was more recent on average in spring than in autumn, as judged both from the proportion of males and immature females and from the distribution of C. semerme in the intestine. The feeding habits of the ringed seals and the rate of development of Corynosoma infection are discussed.

Diet of dominant demersal fish species in the Baltic Sea: Is flounder stealing benthic food from cod?

2020 ◽  
Vol 645 ◽  
pp. 159-170
Author(s):  
K Haase ◽  
A Orio ◽  
J Pawlak ◽  
M Pachur ◽  
M Casini
Keyword(s):  
Baltic Sea ◽  
Species Interactions ◽  
Feeding Habits ◽  
Demersal Fish ◽  
The Baltic Sea ◽  
Fish Prey ◽  
Feeding Mode ◽  
Offshore Area ◽  
The Baltic ◽  
Benthic Prey

Knowledge about ecological interactions between species is of paramount importance in ecology and ecosystem-based fisheries management. To understand species interactions, studies of feeding habits are required. In the Baltic Sea, there is good knowledge of the diet of cod, but little is known about the diet of flounder, the second most abundant demersal fish in the region. In this study, we investigated the diets of cod and flounder for the first time using stomach content data collected simultaneously in 2015-2017 over a large offshore area of the southern Baltic Sea. The diet of flounder was relatively constant between sizes and seasons and was dominated by benthos, with a high proportion in weight of the benthic isopod Saduria entomon. The diet of cod differed between seasons and showed an ontogenetic shift with a relative decrease of benthic prey and an increase of fish prey with size. Historic diet data of cod were used to explore cod diet changes over time, revealing a shift from a specialized to generalist feeding mode paralleled by a large relative decline in benthic prey, especially S. entomon. Flounder populations have increased in the past 2 decades in the study area, and therefore we hypothesized that flounder have deprived cod of important benthic resources through competition. This competition could be exacerbated by the low benthic prey productivity due to increased hypoxia, which could contribute to explaining the current poor status of the Eastern Baltic cod. The results of this study point to the importance of including flounder in multispecies end ecosystem models.

Temporal and spatial sedimentation rate variabilities in the eastern Gotland Basin, the Baltic Sea

Boreas ◽  
2002 ◽  
Vol 31 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Christian Christiansen ◽  
Helmar Kunzendorf ◽  
Kay-Christian Emeis ◽  
Rudolf Endler ◽  
Ulrich Struck ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Sedimentation Rate ◽  
The Baltic Sea ◽  
Gotland Basin ◽  
Temporal And Spatial ◽  
The Baltic
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