Topic
Barnacle
About: Barnacle is a research topic. Over the lifetime, 952 publications have been published within this topic receiving 18065 citations. The topic is also known as: Cirripedia.
Papers published on a yearly basis
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Papers
TL;DR: Field studies demonstrate that the population structure of the barnacle Balanus glandula differs between locations of high and low larval settlement rate, and results from a model for the demography of an open, space-limited population suggest that the settlement rate may be a more important determinant of rocky intertidal community structure than is presently realized.
Abstract: Field studies demonstrate that the population structure of the barnacle Balanus glandula differs between locations of high and low larval settlement rate. These observations, together with results from a model for the demography of an open, space-limited population, suggest that the settlement rate may be a more important determinant of rocky intertidal community structure than is presently realized. Locations with a low larval settlement rate exhibit a generally low abundance of barnacles that varies slightly within years and greatly between years, reflecting yearly differences in settlement. Locations with a high-settlement rate exhibit a generally high abudance of barnacles. However, the abundance varies greatly within years with a significant oscillatory component (period, 30 weeks) and only slightly between years regardless of yearly differences in settlement. At the low-settlement location mortality of barnacles is independent of the area occupied by barnacles. At the high-settlement location mortality is cover-dependent due to increased predation by starfish on areas of high barnacle cover. In both locations the cover-independent component of mortality does not vary with age during the first 60 weeks. As assumed in the demographic model, the kinetics of larval settlement can be described as a process in which the rate of settlement to a quadrat is proportional to the fraction of vacant space within the quadrat. Generalizations that the highest species diversity in a rocky intertidal community is found at locations of intermediate disturbance, and that competition causes zonation between species of the barnacle genera Balanus and Chthamalus, seem to apply only to locations with high-settlement rates.
871 citations
TL;DR: Because predation is patchy and bents are less fecund and grow slower than conics, the conditional developmental strategy is likely to be favored over strict genetical control of shell morphology.
Abstract: Field experiments were conducted in order to determine the nature of shell dimorphism in the acorn barnacle Chthamalus anisopoma and the adaptive significance of the atypical form. The typical morph has the conical shape which is characteristic of acorn barnacles, while the atypical morph appears bent over, with the rim of its aperture oriented perpendicular to its base. The experiments showed that: 1) the bent-over morphology is an environmentally-induced de- velopmental response to the presence of a carnivorous gastropod (Acanthina angelica) and 2) that "bents" are more resistant than "conics" to specialized predation by this snail. The results also showed that predation by A. angelica is patchy and heaviest in the near vicinity of cracks and crevices, which it uses as refuges during periods of tidal inundation. Because predation is patchy and bents are less fecund and grow slower than conics, the conditional developmental strategy is likely to be favored over strict genetical control of shell morphology.
335 citations
TL;DR: Kelp forests along the coast of central California harbor juvenile rockfish that prey on the larvae of invertebrates from the rocky intertidal zone, which reduces recruitment to barnacle populations to 1/50 of the level in the absence of fish.
Abstract: Kelp forests along the coast of central California harbor juvenile rockfish that prey on the larvae of invertebrates from the rocky intertidal zone. This predation reduces recruitment to barnacle populations to 1/50 of the level in the absence of fish. The dynamics of the intertidal community are thus strongly coupled to the dynamics of the offshore kelp community.
238 citations
TL;DR: The results showed a significant accumulation of microplastics in the invertebrates at rates of 0.2-0.6 counts/g indicating higher pollution levels along the coastline, and the need for controlling plastic pollution in Thai coastal areas is demonstrated.
185 citations
TL;DR: In this article, the foraging activities of a large flock of barnacle geese (Branta leucopsis Bechstein) wintering on the West Frisian island of Schiermonnikoog were monitored during the spring of 1978.
Abstract: (1) The foraging activities of a large flock of barnacle geese (Branta leucopsis Bechstein) wintering on the West Frisian island of Schiermonnikoog were monitored during the spring of 1978. On fourteen sites distributed over the grazing area we measured grazing intensity, plant species presence and abundance, standing cropherbage accumulation, and crude protein content of Festuca rubra L., the primary food plant of barnacle geese. Two of the sites had nitrogen fertilizer applied to them. (2) Almost all the sites were grazed repeatedly, but barnacle geese utilized different areas with different mtensities. In spite of this, the standing crops did not differ between sites, and the standing crop on all the sites remained relatively constant throughout the spring, including the sites that received a nitrogen fertilizer. (3) Areas with the highest rates of herbage accumulation were grazed most intensely. Barnacle geese displayed no consistent preference for other site characteristics. (4) High levels of protein in Festuca rubra were a direct result of repeated grazing of sites by barnacle geese, and the consequent sustained regeneration of young, protein-rich plant tissues.
174 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 48 |
| 2024 | 73 |
| 2023 | 79 |
| 2022 | 105 |
| 2021 | 49 |
| 2020 | 53 |