Topic
Limacina
About: Limacina is a research topic. Over the lifetime, 78 publications have been published within this topic receiving 2429 citations.
Papers published on a yearly basis
Papers
TL;DR: It is concluded that feeding with a large mucous web explains the presence of fragments of large, fast moving prey in the stomach contents of both pseudothecosomes and euthecosomes.
Abstract: From 1983 to 1985 we studied the in-situ feeding behavior of fourteen species belonging to nine genera of thecosomatous pteropods, one in the family Limacinidae, seven in the family Cavoliniidae, and one in the family Peraclididae. All the euthecosomes we examined fed with a large spherical mucous web. Peraclis reticulata (D'Orbigny), however, uses a funnel-shaped mucous sheet, resembling that of other pseudothecosomes. Although the feeding mechanisms are similar in all the animals we examined closely, we found great differences in the size and morphology of the external part of the mantle. In species of Diacria and Cavolinia the external mantle attains its greatest complexity, and appears to be used for the sorting or rejection of food and for flotation. Species of the other five cavoliniid genera we studied have greatly reduced external mantles and sink slowly while feeding. Species of Limacina have no external mantle but appear to arrest sinking by setting their mucous webs. P. reticulata, which also appears to be neutrally buoyant, has an extensive external mantle that completely covers the shell. We conclude that feeding with a large mucous web explains the presence of fragments of large, fast moving prey in the stomach contents of both pseudothecosomes and euthecosomes. At present, it is impossible to decide whether thecosomes should be regarded as carnivorous trappers of prey or as suspension feeders. The use of an external mucous web for feeding is probably common to all thecosome pteropods and is the fundamental andaptation that enables them to live holoplanktonically.
117 citations
TL;DR: This study highlights the seasonal nature of prey availability and seabird diets in the polynya, as well as the utility of simultaneously using conventional stomach content analysis and stable isotope and fatty acid analyses to infer dietary patterns in marine food webs.
Abstract: Each year, millions of seabirds migrate to the North Water Polynya, northern Baffin Bay, to feed in its productive waters during the 6 months that the polynya is free of ice. We evaluated sea- sonal shifts in diets of 3 species using the North Water: dovekie Alle alle, thick-billed murre Uria lomvia, and black-legged kittiwake Rissa tridactyla. Diets were assessed through a combination of stable isotope analysis of muscle tissue, fatty acid analysis of subcutaneous fat, and stomach content analysis. Dovekies had the lowest δ 15 N values and hence lowest trophic level in spring and summer, corresponding to their consumption of herbivorous copepods. In fall, their δ 15 N values increased as they switched to feeding at a higher trophic level on primary carnivores such as amphipods and fish. Throughout the study period, kittiwakes and murres had stomach contents and stable isotope values similar to dovekies in fall. Fatty acid signatures of black-legged kittiwakes and dovekies feeding in fall were similar, likely due to the reliance of both species on the pteropod Limacina limacina. Our study highlights the seasonal nature of prey availability and seabird diets in the polynya, as well as the utility of simultaneously using conventional stomach content analysis and stable isotope and fatty acid analyses to infer dietary patterns in marine food webs.
116 citations
TL;DR: Synthesis of data with published information suggests that the diatom bloom observed in the western Ross Sea was dominated by the species Fragilariopsis curta, and occurs annually off the coast of Victoria Land within 100–250 km from the coastal ice edge, corroborating the hypothesis that Phaeocystis are well adapted to develop in a relatively mixed water column.
112 citations
TL;DR: In this article, the fatty acid composition of C. limacina and its only prey Limacina helicina and L. retroversa was investigated with respect to their lipid compositions.
77 citations
TL;DR: The results suggest that exposure to mercury at higher trophic levels including humans can be affected by processes at the bottom of Arctic marine food webs.
Abstract: While much research has been carried out on mercury in large marine mammals and associated food webs in northern regions, comparatively less has been conducted on lower trophic levels including zooplankton and the subsequent transfer to predators, which marks the entry of mercury into northern marine food webs. We present here the first database for mercury uptake and transfer exclusively within zooplankton food webs in northern marine waters. We have investigated both total (THg) and monomethylmercury (MMHg) concentrations, and isotopic signatures (δ(15)N and δ(13)C) in individual zooplankton taxa collected over a period of eight years (2003-2010) from across Hudson Bay (including Hudson Strait and Foxe Basin) as part of research icebreaker cruises. δ(15)N values ranged from 3.4 to 14.0‰, implying trophic levels ranging from 1 to 4, and THg concentrations ranged from 5 to 242 ng g(-1) dw. Food web linkages were identified within the data set, and mercury biomagnification was evident both with THg and MMHg concentrations increasing from prey to predator, and with trophic magnification factors (TMFs). Total mercury and MMHg transfer in a unique prey-predator linkage (Limacina helicina-Clione limacina) are investigated and discussed with regard to known physiological and biochemical characteristics. The results suggest that exposure to mercury at higher trophic levels including humans can be affected by processes at the bottom of Arctic marine food webs.
72 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 4 |
| 2019 | 1 |
| 2018 | 1 |
| 2017 | 7 |
| 2016 | 1 |