Topic
Anceps
About: Anceps is a research topic. Over the lifetime, 80 publications have been published within this topic receiving 648 citations. The topic is also known as: anceps syllable.
Papers published on a yearly basis
Papers
TL;DR: Helisoma anceps, a pulmonate snail, was infected with 8 species of larval trematodes in Charlie's Pond, located in the Piedmont area of North Carolina, and nearly all snails shedding cercariae of H. occidualis were castrated by the parasite.
Abstract: Helisoma anceps, a pulmonate snail, was infected with 8 species of larval trematodes in Charlie's Pond, located in the Piedmont area of North Carolina. Each species except Halipegus occidualis occurred in less than 4% of the snails; prevalence of H. occidualis was 54.6%. The peak in H. occidualis occurred in late spring, declined in summer, and increased in fall. A field study designed to monitor egg production by H. anceps revealed that nearly all snails shedding cercariae of H. occidualis were castrated by the parasite. Castration was mechanical, by direct ingestion of host tissue by trematode rediae. One of the most pervasive effects of parasitism is the impact of larval trematodes on the reproductive biology of molluscan intermediate hosts. While the primary site of infection in snails is usually the hepatopancreas, they frequently spread into the gonad and cause host castration (Pratt and Barton, 1941; Etges and Gresso, 1965; Robson and Williams, 1971; Cheng et al., 1983). During the summer of 1983, preliminary observations on the pulmonate snail, Helisoma anceps, in a small North Carolina pond revealed several species of larval trematodes, including the hemiurid Halipegus occidualis. Because of the extent to which host tissue was replaced by parasite biomass, it seemed likely that such infections, especially those by H. occidualis, might have a serious effect on the population and reproductive biology of the snail hosts. Accordingly, a study was undertaken to examine the seasonal dynamics of H. occidualis in H. anceps and to determine the effect of H. occidualis on the fecundity of H. anceps. MATERIALS AND METHODS
48 citations
TL;DR: This book discusses the distribution and ecology of Fucus distichus at particular sites, as well as taxonomic considerations, and the possible longevity of the species.
Abstract: The distribution and ecology of subspp. anceps and edentatus of F. distichus L. emend. Powell (1957) in Britain and Ireland is described in detail, based on recent ecological surveys and critical examination of all past records.F. distichus anceps is a small form confined to certain very exposed coasts in the north and west of Scotland and Ireland, where it reaches the southern limit of its geographical range. This plant may be a relict form in Britain, existing now only under an extraordinarily narrow range of rigorous habitat conditions; it is not thought to be actively extending its range southwards at the present time. The ecology of subsp. anceps is considered principally in relation to that of other reduced fucoids found on exposed British shores, viz. F. spiralis f. nana and F. vesiculosus f. linearis; all three forms are illustrated by photographs and means of distinguishing them are described. The lifespan of subsp. ancepsis thought to be 2 to 3 years at some Irish sites, but may be longer at some of the Scottish sites.
41 citations
ARCO1
TL;DR: Three novel fatty acid derivatives, containing one or two butenolide moieties, were isolated from the Caribbean gorgonian Pterogorgia anceps and chemically characterized by spectroscopic methods and comparison with known compounds.
Abstract: Three novel fatty acid derivatives (1-3), containing one or two butenolide moieties, were isolated from the Caribbean gorgonian Pterogorgia anceps and chemically characterized by spectroscopic methods and comparison with known compounds. The new molecules were structurally related to ancepsenolide (4), a typical metabolite from Pterogorgia species, which was not detected in this collection of P. anceps.
32 citations
TL;DR: Overall, photosynthesis, UV tolerance and antioxidative potential are highly regulated in D. anceps corresponding to the respective light regimes along its natural growth sites.
Abstract: The endemic Antarctic brown macroalga Desmarestia anceps colonizes the subtidal between 5 and 30 m in Potter Cove on King George Island (South Shetland Islands, Antarctica). Experiments were conducted to study photosynthetic activities, antioxidative enzymes and UV tolerance of field-grown individuals with respect to the light histories along different subtidal positions. Individuals collected from the upper (5.5 m) and mid-subtidal (9.0 m) are characterized by high maximum electron transport rates (ETRmax) measured by PAM-fluorometry and high activities of superoxide dismutase (SOD) supported by considerable activities of glutathione reductase. Individuals of this species from the upper subtidal are able to tolerate high irradiances of UV-B radiation because its photosynthetic apparatus is putatively well protected by phlorotannins. In contrast, individuals from lower subtidal positions (13.5 and 15.5 m) showed an opposite trend: lower ETRmax and SOD activities as well as a lower UV tolerance of photosynthesis. Moreover, a non-denaturing polyacrylamide gel electrophoresis (native PAGE) of a partially purified crude extract reveals that D. anceps has probably six isoforms of SOD. These intra-specific patterns imply a high phenotypical plasticity of D. anceps with respect to its photosynthesis and photoprotective mechanisms. Overall, photosynthesis, UV tolerance and antioxidative potential are highly regulated in D. anceps corresponding to the respective light regimes along its natural growth sites.
30 citations
TL;DR: The role of microhabitat in community structure as an important niche axis that maintains closely related species in the same habitat is highlighted.
Abstract: Habitat heterogeneity has been shown to promote co-existence of closely related species. Based on this concept, a field study was conducted on the niche partitioning of three territorial congeneric species of skimmers (Anisoptera: Libellulidae) in Northeast Algeria during the breeding season of 2011. According to their size, there is a descending hierarchy between Orthetrum nitidinerve Selys, O. chrysostigma (Burmeister), and O. coerulescens anceps (Schneider). After being marked and surveyed, the two latter species had the same breeding behavior sequence. Knowing that they had almost the same size, such species could not co-occur in the same habitat according to the competitive exclusion principle. The spatial distribution of the three species was investigated at two different microhabitats, and it was found that these two species were actually isolated at this scale. O. chrysostigma and O. nitidinerve preferred open areas, while O. c. anceps occurred in highly vegetated waters. This study highlights the role of microhabitat in community structure as an important niche axis that maintains closely related species in the same habitat.
30 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 2 |
| 2019 | 3 |
| 2018 | 1 |
| 2017 | 3 |
| 2016 | 4 |