Experiments on factors influencing settlement,survival, and growth of two species of barnacles in new south wales

Adult Tesseropora rosea (Krauss) and Tetraclitella purpurascens (Wood) are mostly found in the eulittoral (barnacle) zone of rocky seashores in New South Wales. Below this zone most space is occupied by the tube-worm Galeolaria caespitosa (Lamarck) or by various species of macroalgae. Within the eulittoral zone, T. rosea are mostly on sunny areas of rock exposed to relatively strong wave-action. T. purpurascens are present mainly in crevices, caves, and under ledges where there is considerable shade.Cyprids of both species settled on sandstone plates and on experimentally cleared areas in the barnacle and Galeolaria zones. Neither species settled where the substratum was already covered by algae or Galeolaria. No spat of T. purpurascens were found in sunny areas of the barnacle zone. T. rosea, however, settled in cleared substrata in sunny and shaded areas. Neither species settled in the littoral fringe above the upper limit of distribution of adults. On boulders transferred to high levels of the shore during a storm, small T. purpurascens died within a few weeks.Barnacles of both species which had settled in experimentally cleared areas in the Galeolaria zone survived and grew. In these areas some T. purpurascens were killed by being smothered by tube-worms which settled after the barnacles. This probably happens to T. rosea, but was not demonstrated experimentally. In the Galeolaria zone, both species of barnacles were very quickly smothered and killed by macroalgae growing over them, except where these were experimentally removed.Within the barnacle zone, all newly-settled spat of T. purpurascens transferred to sunny sites died within two months, whilst many of those in shaded sites survived. In areas where wave-action was strong, spat of T. rosea survived and grew well in sunny areas, but survived better in the shade. Under a ledge, however, where wave-action was reduced, all the T. rosea in sunny sites, and most of those in shaded sites died within two months; many newly-settled T. purpurascens survived in the shade in this area.The grazing limpet Cellana tramoserica (Sowerby) dislodged and crushed some newly-settled T. rosea and reduced survival in some sunny areas. T. rosea settled preferentially on bare rock and were rarely found on the shells of adult barnacles. Thus, the density of spat was greater where adult barnacles were absent. In contrast, many newly-settled T. purpurascens were found on the shells of adults of their own species in shaded areas; they also settled on cleared rock. Because T. purpurascens tended to settle amongst and on adults, and in crevices and confined areas, they were not much affected by limpets. When newly-settled T. purpurascens were in high densities, they had lower survival than in areas with reduced densities, because of squashing and smothering by each other.The upper and lower limits of vertical distribution (zonation) of these two species of barnacles are determined primarily by the settlement of cyprids. Neither species settled at the highest levels on the shore. Whether this was due to the decreasing time of submersion during high tide towards the top of the shore, or a result of preferences for settlement site is unknown. Even if cyprids were to settle in the littoral fringe, the spat would die very quickly probably as a result of desiccation. Below the barnacle zone, the entire substratum is usually occupied by other sessile species, particularly macroalgae, on which the barnacles do not settle. In experimentally cleared areas below the barnacle zone, or in any naturally cleared areas both species settled, and could survive the physical conditions. Newly-settled spat were, however, overgrown and killed by algae and Galeolaria.Within the barnacle zone, T. purpurascens is restricted to shaded areas because of the inability of newly-settled spat to survive the physical stresses of high temperature and desiccation in sunny habitats. T. rosea appears to be excluded from shaded areas by a combination of the lack of suitable substrata on which to settle, and the effects of reduced water-flow in many crevices and under ledges. T. rosea survived better in areas with strong wave-action and can survive in shaded areas where water-flow is not reduced by the topography of the substratum.     

Mesostructure and activity of photosynthetic apparatus for three crassulacean species grown in cold climate

A comparative study of leaf anatomy and morphology and of CO₂ exchange was conducted with Rhodiola rosea L., Hylotelephium triphyllum (Haw.) Holub., and Sedum acre L. as representative Crassulacean species occurring in the northeast European Russia. The leaf mesophyll in R. rosea was clearly differentiated into the palisade and spongy tissues, whereas the mesophyll of stonecrops (H. triphyllum and S. acre) was composed of round-shaped cells. The leaves of S. acre featured the largest volume of mesophyll cells and possessed water-retaining cells located around conducting bundles. The chloroplast volume in S. acre (50 μm³) was three times smaller and the number of chloroplasts per cell (170 cell^?1) was three times higher than in R. rosea and H. triphyllum (50–55 cell^?1). The content of chlorophylls (5–7 mg/g dry wt) and carotenoids (1.5–2.0 mg/g dry wt) in R. rosea leaves was 2–3 times higher than in leaves of stonecrops. The rate of CO₂ net uptake in Crassulacean species depended on mesostructure and correlated with the content of pigments and soluble carbohydrates. The photosynthetic rate in R. rosea under optimal irradiance and temperature attained the value of 40 mg/(g dry wt), which is 3 and 8 times higher than in H. triphyllum and S. acre, respectively. The temperature optimum for photosynthesis of R. rosea was observed at 8–18°C, while the optimum for stonecrops was shifted towards higher temperatures by 3–5°C. At chilling temperatures (5–7°C), the leaves of R. rosea retained 50% of their maximal photosynthetic rate, while photosynthetic rates in H. triphyllum and S. acre leaves lowered to 25–30% of the maximal rate. The increase in temperature to 25–30°C led to depression of CO₂ net uptake in leaves of Crassulacean species. In R. rosea and H. triphyllum, the rate of photosynthetic electron flow was depressed at high irradiances and temperatures that were supraoptimal for net photosynthesis. It is concluded that the photosynthetic apparatus of Crassulacean species is well adapted to moderate and chilling temperatures, which adjusts the plant metabolism to “life strategies” under conditions of cold climate.     

Effects of prey density,prey size and predator size on rates of feeding by an intertidal predatory gastropod Morula marginalba Blainville (Muricidae), on several species of prey

As a prerequisite for models of foraging behaviour of the whelk, Morula marginalba Blainville (Muricidae), the effects of variation in density of prey on the rate of feeding of the predator were examined in field conditions for three coexisting species of prey. Densities of prey used were those at which the prey, two limpets and a barnacle, occurred naturally in the rocky intertidal habitat.Large limpets, Cellana tramoserica (Sowerby) can resist attacks by predatory gastropods by raising the mantle over the outside of the shell. These experiments showed that no C. tramoserica were killed by Morula marginalba even at very great densities and with no alternative prey present. For the small limpet Patelloida latistrigata (Angas), one of the whelk's most highly preferred prey, juveniles were eaten 1.4 times as fast as adults. Fitting the random predator equation gave greater attack coefficients and shorter handling times for juvenile than adult limpets.Sizes of both predator and prey affected rates of eating barnacles, Tesseropora rosea (Krauss), but not in a simple way. Whelks of 15-mm aperture length ate adult barnacles 4.2 times faster than did 12-mm whelks, but there was no significant difference in the rates at which the two sizes of snail ate juvenile barnacles.Rates of feeding on T. rosea and Patelloida latistrigata increased significantly with prey density. These results form a basis for including the density of prey in models of spatial dispersion of the predatory gastropod Morula marginalba.     

Observations on the development and maintenance of the deep sea barnacle,Octolasmis aymonini geryonophila (Pilsbry)

Thirty-two pedunculate barnacles, O. a. geryonophila, were maintained in culture for a period of 2 yr in the laboratory. These barnacles were obtained from the pleopods and mouth parts of the giant marine isopod, Bathynomus giganteus, which had been collected, at a depth of 200 fathoms, in the Gulf of Mexico.

The carina, scutum, mandible and maxilla of adult barnacles were typical of deep water species. However, the tergum and labrum were intermediate between those of shallow and deep water species.

Adults 3.1–4.1 mm in length were cultured in sea water (15–19°C), and fed on benthic copepods such as Tisbe furcata and Laophonte sp. Three broods of nauplii from 8 barnacles were obtained in 2 yr. Larvae were reared on plankton collected from Coney Island waters in which nauplii reached Stage IV in 10–14 days at 16°C. Isochrysis galbana and Thalassiosira pseudonana individually or in combination maintained nauplii to Stage IV, but with very high mortality. The lack of spines on the carapace edge of the nauplii distinguishes this deep water species from the shallow water form, O. mulleri.     

Orientated swimming in the jellyfish Stomolopus meleagris L. Agassiz (Scyphozoan: Rhizostomida)

The jellyfish Stomolopus meleagris L. Agassiz is a strong horizontal swimmer. The course of this jellyfish is characterized by little pitch or yaw, and roll is counter-clockwise at a constant rate. This steady course suggests that these jellyfish compensate for local turbulence. Within local populations, jellyfish usually (13 out of 15 cases) swam in roughly the same direction, i.e. their orientation was non-random (Raleigh test, P<0.02). Overall swimming direction of local jellyfish populations was significantly correlated with the direction of the wind and surface waves (circular-circular correlation, √nr=2.04, P<0.025) but was not significantly correlated with either the sun's bearing or local current direction. Free-swimming jellyfish whose paths were deflected by turbulence (natural or man-made) rapidly re-orientated either to their initial orientation, or at 180° to the initial orientation. The data suggest that S. meleagris actively orientates swimming relative to directional cues in the water column.     

Synchronous annual recruitment variation in barnacles and ascidians in the White Sea shallow subtidal 1999–2010

Multiple foundation species in a community may exhibit alternative ecological strategies. Barnacles Balanus crenatus Bruguiere and solitary ascidians Styela spp. often co-dominate on mixed sediments in the White Sea shallow subtidal, supporting numerous dependent organisms. Larvae of B. crenatus stay in plankton for several weeks, while ascidian tadpoles float for 1–2 days. Given this difference in spreading potential, we expected recruitment in barnacles and ascidians to be controlled by the factors operating at different spatial scales. In 1999–2010, we annually sampled the community dominated by barnacles and ascidians to relate their recruitment rates to the substrate space availability, abundance of adults, and climatic variables. Most barnacles recruited to the surfaces of shells, stones, and conspecific adults. Ascidian recruits were chiefly found on barnacles. Annual recruitment rates of barnacles and ascidians were strictly correlated and strongly depended on average temperatures of the preceding fall (positively), winter (negatively), and current summer (negatively). Variation of mean annual recruitment rates was 26-fold for barnacles and 30-fold for ascidians. We found no limitation of recruitment by hard substrate availability. Inconsistent with our original hypothesis, large-scale environmental factors similarly accounted for most annual recruitment variation in both foundation species studied.     

Purification and characterization of a novel exocellular keratinase from Kocuria rosea

A keratinolytic protease activity secreted by Kocuria rosea when cultured in bioreactors using feathers as unique carbon and nitrogen source was purified and characterized. This novel keratinase activity was purified from the bioreaction broth growing media to apparent homogeneity after single step, (24-fold purification with a high yield of 54%) using DEAE column chromatography. The native molecular mass of the enzyme determined by gel filtration chromatography was 240 kDa. K. rosea extracellular keratinase was stable in a broad range of pH (8–11) and temperature (10–60 °C) profile with optimums at pH 10 and 40 °C. Crystalline soybean trypsin inhibitor (type I-S), 4-(2-aminoethyl) benzenesulfonyl floride (AEBSF) and chymostatin, strongly inhibited the keratinolytic activity indicating that the keratinase belongs to the serine protease family. The K_m for the soluble keratin degradation from feathers was 242 μM. The enzyme was resistant to denaturing or reducing agents such as dithiotreitol and 2-mercaptoethanol. All of the biochemical characteristics, raising the potential use of this enzyme in numerous industrial applications.     

Purple Pitcher Plant (Sarracenia rosea) Dieback and Partial Community Disassembly following Experimental Storm Surge in a Coastal Pitcher Plant Bog

Sea-level rise and frequent intense hurricanes associated with climate change will result in recurrent flooding of inland systems such as Gulf Coastal pitcher plant bogs by storm surges. These surges can transport salt water and sediment to freshwater bogs, greatly affecting their biological integrity. Purple pitcher plants (Sarracenia rosea) are Gulf Coast pitcher plant bog inhabitants that could be at a disadvantage under this scenario because their pitcher morphology may leave them prone to collection of saline water and sediment after a surge. We investigated the effects of storm surge water salinity and sediment type on S. rosea vitality, plant community structure, and bog soil-water conductivity. Plots (containing ≥1 ramet of S. rosea) were experimentally flooded with fresh or saline water crossed with one of three sediment types (local, foreign, or no sediment). There were no treatment effects on soil-water conductivity; nevertheless, direct exposure to saline water resulted in significantly lower S. rosea cover until the following season when a prescribed fire and regional drought contributed to the decline of all the S. rosea to near zero percent cover. There were also significant differences in plant community structure between treatments over time, reflecting how numerous species increased in abundance and a few species decreased in abundance. However, in contrast to S. rosea, most of the other species in the community appeared resilient to the effects of storm surge. Thus, although the community may be somewhat affected by storm surge, those few species that are particularly sensitive to the storm surge disturbance will likely drop out of the community and be replaced by more resilient species. Depending on the longevity of these biological legacies, Gulf Coastal pitcher plant bogs may be incapable of fully recovering if they become exposed to storm surge more frequently due to climate change.     

Induction of Settlement and Metamorphosis of the Veliger Larvae of the Nudibranch,Onchidoris bilamellata

Summary

Onchidoris bilamellata veligers were reared in the laboratory on a combination of phytoñagellates and diatoms. They attained metamorphic competence after a period of 28 to 32 days at 11°C, or 60 to 80 days at a temperature averaging 7.5° C.

Experimental evidence suggests that settlement is stimulated by a diffusible chemical emanating from living barnacles, whereas metamorphosis is induced by a chemical or mechanochemical cue, which is also associated with barnacles. Settlement and metamorphosis are considered to be separable events in O. bilamellata. The settlement response is reversible and can be repeated; it involves a characteristic behavioral repertoire including descent to the bottom, foot contortions and crawling on the pedal sole. Settlement occurs only in seawater that contains, or had previously contained, living barnacles. Metamorphosis is irreversible and involves the resorption of the velum, loss of the larval shell, and incorporation of the visceral mass into the cephalopedal mass. Metamorphosis is triggered only when physical contact with living or dead barnacles is made (dead barnacles refers to shell and tissue fragments which are only effective in inducing metamorphosis when they are used in combination with seawater that had previously contained living barnacles).

Settlement and metamorphosis in O. bilamellata is compared with that of other nudibranch species, and its unique settlement response is discussed.     

Effect of thermal acclimation on preferred temperatures in two mygalomorph spiders inhabiting contrasting habitats

Variations in the preferred temperatures during the rest periods of Grammostola rosea Walckenaer and Paraphysa parvula Pocock, two mygalomorph spiders occupying different habitats in central Chile, are analyzed. The former inhabits arid and semi‐arid lowland near plant communities, composed of shrubs (evergreens with small leathery leaves) and small trees; the latter is found in the central mountains of the Chilean Andes, above 2000 m.a.s.l. The preferred temperatures of these spiders at different times of day and exposure to cold (15 °C) and warm (25 °C) acclimation temperatures are compared. Body mass does not affect the preferred temperature of the larger spider G. rosea, although P. parvula, a spider with half of the body mass of G. rosea, shows a decrease in preferred temperature with body mass. This can be explained by a higher plasticity and thermal sensitivity of the smaller species as result of increased surface : volume ratio. The preferred temperature increases with the hour of the day under both acclimation conditions in P. parvula and in cold‐acclimated G. rosea, which is likely associated with crepuscular and nocturnal behaviour in both species. Grammostola rosea shows temperature preferences lower than those of P. parvula under both acclimation conditions. The increase of the acclimation temperature from 15 to 25 °C results in an increment of 2–3 °C in the preferred temperature of P. parvula but only 0.2 °C in that of G. rosea. Two contrasting lifestyle strategies are found: a small mygalomorph spider with phenotypic plasticity and adaptation to the fluctuating environment of high altitude, and a large mygalomorph spider with higher thermal inertia adapted to the more stable environment of lowlands.     

5′-Phosphodiesterase Formation by Cultured Plant Cells

5′-Phosphodiesterase (5′-PDase) which degrades RNA to nucleoside-5′-monophosphates was investigated in various kinds of plant calli, and the calli of Vinca rosea and Phytolacca americana were found to have the high activity. The liquid culture conditions of the cells of V. rosea were examined. Three mg of kinetin and 0.5 mg of 2,4-dichlorophenoxyacetic acid per liter in the Murashige and Skoog medium were optimal for the growth and the 5′-PDase formation. Under the optimal conditions, time courses of the cell growth and the enzyme formation were measured.

The 5′-PDase of the cultured cells of V. rosea in suspension showed the maximal activity at pH 8.0 and 60°C. A comparison of 5′-PDase of the cultured cells and of the mother plant of V. rosea was carried out and it was found that the cultured cells had more than 30 times as much 5′-PDase activity as the mother plant on dry cell weight basis.     

Differential activation of the plantar flexor muscles in balance control across different feet orientations on the ground

The ankle plantar flexor muscles act synergistically to control quiet and dynamic body balance. Previous research has shown that the medial (MG) and lateral (LG) gastrocnemii, and soleus (SOL) are differentially activated as a function of motor task requirements. In the present investigation, we evaluated modulation of the plantar flexors' activation from feet orientation on the ground in an upright stance and the ensuing reactive response to a perturbation. A single group of young participants (n = 24) was evaluated in a task requiring initial stabilization of body balance against a backward pulling load (5% or 10% of body weight) attached to their trunk, and then the balance was suddenly perturbed, releasing the load. Four feet orientations were compared: parallel (0°), outward orientation at 15° and 30°, and the preferred orientation (M = 10.5°). Results revealed a higher activation magnitude of SOL compared to MG-LG when sustaining quiet balance against the 10% load. In the generation of reactive responses, MG was characterized by earlier, steeper, and proportionally higher activation than LG-SOL. Feet orientation at 30° led to higher muscular activation than the other orientations, while the activation relationship across muscles was unaffected by feet orientation. Our results support the conclusion of task-specific differential modulation of the plantar flexor muscles for balance control.     

Heat treatment induced bacterial changes in irrigation water and their implications for plant disease management

A new heat treatment for recycled irrigation water using 48 °C for 24 h to inactivate Phytophthora and bacterial plant pathogens is estimated to reduce fuel cost and environmental footprint by more than 50 % compared to current protocol (95 °C for 30 s). The objective of this study was to determine the impact of this new heat treatment temperature regime on bacterial community structure in water and its practical implications. Bacterial communities in irrigation water were analyzed before and after heat treatment using both culture-dependent and -independent strategies based on the 16S ribosomal DNA. A significant shift was observed in the bacterial community after heat treatment. Most importantly, bacteria with biological control potential—Bacillus and Paenibacillus, and Pseudomonas species became more abundant at both 48 and 42 °C. These findings imply that the new heat treatment procedure not only controls existing plant pathogens but also may make the heat-treated irrigation water a more antagonistic environment against plant pathogens, promoting sustainable disease management.     

The effect of temperature on feeding,growth, and metabolism during the last larval stadium of the female house cricket, Acheta domesticus

Eighth instar female house crickets at 35°C developed faster, gained slightly more wet weight, and consumed less food, water, and oxygen than at 25°C. The duration of the 8th stadium at 25°C was 13 days (undisturbed), but was 14 days when disturbed by daily weighing. The duration of the 8th stadium at 30°C was 8 days and at 35°C was 6 days. During the first half of the 8th stadium at 25, 30, and 35°C, there was a high rate of food and water consumption resulting in statistically equal maximum dry weight achievement (124 mg). Respiratory quotients greater than one during this time indicated the conversion of ingested carbohydrate to fat. During the latter half of the 8th stadium, food and water consumption declined and the crickets lost weight. The period of weight loss was proportionally much longer at 25°C than at 30 or 35°C. Respiratory quotients lower than 1.0 during the latter half of the 8th stadium at 30 and 35°C indicated the metabolism of stored lipids. The respiratory quotient at 25°C never fell below 1.0, possibly because some food remained in the gut. The absorption efficiency was not influenced by temperature (25–35°C). Though the caloric content of the faeces was lower at 25°C than at 30 or 35°C, which correlated to the much longer time for food passage at 25°C than at 35°C, the difference in total calories egested was insufficient to alter the absorption efficiency. A longer period of reduced feeding and greater dry weight loss during the latter half of the 8th stadium at 25°C resulted in a lower metabolic efficiency at 25°C than at 30 or 35°C. Eighth instar crickets in response to a step-function transfer from 30°C–25 or 35°C showed an immediate (<1 hr) and complete metabolic adjustment which was not affected by the temperature history during the 7th stadium. House crickets did not exhibit temperature acclimation in the range 20–40°C, the metabolic rate being determined by ambient temperature. The Q₁₀ for oxygen consumption in the range 20–40°C was about 2.     

A Transformation-induced Alteration of Cellular Membranes in Crown Gall Tumor Cells

Phospholipids were utilized as a membrane marker to test for transformation-induced alteration of cellular membranes of cultured crown gall cells of Vinca rosea L. Fully transformed cells contained less than half the amount of phospholipids (7.8 micrograms lipid P per gram fresh weight) of normal V. rosea cells (21.4 micrograms lipid P per gram fresh weight). The normal V. rosea callus cells were not significantly different (P > 0.05) in phospholipid content from partially transformed crown gall cells (20.7 micrograms lipid P per gram fresh weight). Stimulation to rapid growth of the partially transformed cells by adding higher concentrations of inorganic salts and auxin did not significantly alter their phospholipid content (23.1 micrograms lipid P per gram fresh weight). These findings suggest that the transformation process is directly responsible for an alteration of the cellular membranes and that the membrane alteration cannot be attributed to secondary effects associated with the rapid growth of these neoplastic cells.     

The effect of water temperature and velocity on barnacle growth: Quantifying the impact of multiple environmental stressors

Organisms employ a wide array of physiological and behavioral responses in an effort to endure stressful environmental conditions. For many marine invertebrates, physiological and/or behavioral performance is dependent on physical conditions in the fluid environment. Although factors such as water temperature and velocity can elicit changes in respiration and feeding, the manner in which these processes integrate to shape growth remains unclear. In a growth experiment, juvenile barnacles (Balanus glandula) were raised in dockside, once-through flow chambers at water velocities of 2 versus 19 cm s⁻¹ and temperatures of 11.5 versus 14 °C. Over 37 days, growth rates (i.e., shell basal area) increased with faster water velocities and higher temperatures. Barnacles at high flows had shorter feeding appendages (i.e., cirri), suggesting that growth patterns are unlikely related to plastic responses in cirral length. A separate experiment in the field confirmed patterns of temperature- and flow-dependent growth over 41 days. Outplanted juvenile barnacles exposed to the faster water velocities (32±1 and 34±1 cm s⁻¹; mean±SE) and warm temperatures (16.81±0.05 °C) experienced higher growth compared to individuals at low velocities (1±1 cm s⁻¹) and temperatures (13.67±0.02 °C). Growth data were consistent with estimates from a simple energy budget model based on previously measured feeding and respiration response curves that predicted peak growth at moderate temperatures (15 °C) and velocities (20–30 cm s⁻¹). Low growth is expected at both low and high velocities due to lower encounter rates with suspended food particles and lower capture efficiencies respectively. At high temperatures, growth is likely limited by high metabolic costs, whereas slow growth at low temperatures may be a consequence of low oxygen availability and/or slow cirral beating and low feeding rates. Moreover, these results advocate for approaches that consider the combined effects of multiple stressors and suggest that both increases and decreases in temperature or flow impact barnacle growth, but through different physiological and behavioral mechanisms.     

An N-acetyl-β-d-glucosaminidase gene, cr-nag1, from the biocontrol agent Clonostachys rosea is up-regulated in antagonistic interactions with Fusarium culmorum

Clonostachys rosea is a widely distributed fungus that often acts as a parasite on other soil fungi. This fungus has also been reported as a potential parasite against nematodes and insects. The antagonistic activity is thought to be correlated with the secretion of cell wall-degrading enzymes, including chitinases. In this work, we identified and characterized an N-acetyl-β-d-glucosaminidase-encoding gene, cr-nag1, belonging to glycosyl hydrolase family 20, from the C. rosea strain IK726 using a degenerated primer strategy designed from conserved motifs. The complete gene, including its promoter region, was obtained by genomic walking. Southern analysis showed that cr-nag1 is present as a single copy gene in C. rosea. Phylogenetically, cr-nag1 showed the highest similarity to N-acetyl-β-d-glucosaminidase genes from other mycoparasitic fungi. Enzymatic assays and RT-PCR showed that the NAGase activity of C. rosea is specifically repressed in medium containing a high glucose content and is expressed in media containing chitin or Fusarium culmorum cell walls as sole carbon sources. Macroscopic and microscopic observations indicated that the mycelial growth of F. culmorum and Pythium ultimum were inhibited during interactions with C. rosea. High expression of cr-nag1 was found in interactions between C. rosea and F. culmorum, whereas the expression of cr-nag1 in interactions between C. rosea and P. ultimum was similar to the control. This indicates that although C. rosea secretes chitin-hydrolysing agents in order to target the cell wall of F. culmorum, it seems to use another strategy for controlling the development of the oomycete P. ultimum.     

Colonization by barnacles on fossil Clypeaster: an exceptional example of larval settlement

The presence of c. 1450 individuals of the balanid barnacle Balanus crenatus Bruguière encrusting the test of a clypeasteroid sea urchin from the Late Miocene of the Guadalquivir Basin (southwestern Spain) allows proposing a settlement pattern linked to the growth of the encrusting organism. The possible influence of dip angle was controlled by dividing the test into four concentric zones ranging from lowest margin to apex (0–15°, 15–30°, 30–50° and 0°). Contour diagrams were prepared to identify areas of highest barnacle density as well as size categories distribution in relationship to the pitch of the sea urchin test. The orientation of balanid tests was recorded and plotted on rose diagrams from 0° to 180°. Four size categories of barnacles were distinguished: (1) < 1 mm, (2) 1–2 mm, (3) 2–3 mm and (4) 3–4 mm; these correspond to a growth sequence ranging from post‐larval forms to juveniles. Two areas of maximum settlement density are situated on the posterior margin of the test, on aboral as well as oral surfaces. The aboral surface shows the maximum number of barnacles. Two groups of individuals are defined on the basis of their location, that is, those encrusting the posterior medium part of the urchin, and those located on the anterior half. The results suggest that larval settlement was initially controlled by the availability of free space and afterwards by an intensification effect. Orientation and dip of the test may have played a secondary role in the settlement of the larvae. Substrate colonization seems to have been closely related to the biostratinomic history of the sea urchin test and although several scenarios are possible, our data are congruent with a synchronous settlement of both surfaces (aboral and oral) by one spat or several.     

No effect of naturally-occurring rock types on settlement or survival in the intertidal barnacle, Tesseropora rosea (Krauss)

The settlement and early survival of young barnacles, Tesseropora rosea (Krauss), on four different, naturally-occurring rock substrata were investigated in a four-factor experiment. Three factors assessed variation on three spatial scales: among shores on the New South Wales coast in eastern Australia i.e., 10 to 600 km apart; among sites within these shores i.e., 20 to 50 m apart; within these sites, i.e., < 3 m². Variation on these scales was usually significant for settlement density and proportional survival 30–60 days post-settlement. The fourth factor, different rock types, showed no consistent trends for settlement density or proportional survival. Previously observed differences in these phenomena among shores cannot, therefore, be ascribed to differences in rock substrata.     

Use of a light-dependent magnetic compass for y-axis orientation in European common frog (Rana temporaria) tadpoles

We provide evidence for the use of a magnetic compass for y-axis orientation (i.e., orientation along the shore-deep water axis) by tadpoles of the European common frog (Rana temporaria). Furthermore, our study provides evidence for a wavelength-dependent effect of light on magnetic compass orientation in amphibians. Tadpoles trained and then tested under full-spectrum light displayed magnetic compass orientation that coincided with the trained shore-deep water axes of their training tanks. Conversely, tadpoles trained under long-wavelength (≥500 nm) light and tested under full-spectrum light, and tadpoles trained under full-spectrum light and tested under long-wavelength (≥500 nm) light, exhibited a 90° shift in magnetic compass orientation relative to the trained y-axis direction. Our results are consistent with earlier studies showing that the observed 90° shift in the direction of magnetic compass orientation under long-wavelength (≥500 nm) light is due to a direct effect of light on the underlying magnetoreception mechanism. These findings also show that wavelength-dependent effects of light do not compromise the function of the magnetic compass under a wide range of natural lighting conditions, presumably due to a large asymmetry in the relatively sensitivity of antagonistic short- and long-wavelength inputs to the light-dependent magnetic compass.