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Figure 14 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 14. Biology and morphology of Diogma glabrata. (A) Final instar larva of D. glabrata. (B) Later-instar larva feeding on Bryhnia cf. tenerrima (Brachytheciaceae). (C) Characters of anal segment. Abbreviations: dl, dorsal lobe; dm, dorsomedial lobe; vl, ventral lobe. Scale = 1 mm.
Figure 9 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 9. Histological characterisation of internal structure of anal segment of Liogma brevipecten at first instar, in crosssection. Selected cross-sections of anal segment from anterior (A) to posterior (D), showing spiracular field and surroundings. Black arrowheads denote intrinsic muscles of lateral lobes. Abbreviations: anp, anal papilla; at, atrium chamber; re, rectum; stg, stigmal ring. Scale = 50 µm.
Figure 13 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 13. Ultrastructure of Cylindrotoma japonica final-instar larva, SEM views. (A) larval head loaded with a mass of secretion (presumably silk material); secretion is reticulated and entirely conceals the head capsule but a small, circular opening is present near the centre (white arrowhead), which leads to the mouth underneath. (B) Close-up view of a secretion mass, which provides a cap for the head capsule, revealing delicate reticulated threads. Bright flaring is due to sample charge. (C) Isolated threads of the ventral thoracic segment; note that the diameter is greater than that of head part threads in image B. (D) Ventral lobe on abdominal segment VII, in which the cuticular surface is worn out due to abrasion. Scales as shown in each image.
Figure 6 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 6. Comparative morphology of dorsal elongated cuticular appendages on abdominal segment in cylindrotomine larvae at late instar. (A) Cylindrotoma japonica. (B) Diogma glabrata. (C) Liogma brevipecten. (D) L. mikado. (E) L. nodicornis. (F) L. serraticornis. (G) Triogma kuwanai. (H) Phalacrocera replicata. For C, E and H, body colour is faded away due to preservation in alcohol. Scale = 1 mm.
Figure 5 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 5. Schematic diagram illustrating diverse arrangements and numbers of the elongated cuticular lobes in 11 cylindrotomine species. Each diagram represents a simplified larval body, longitudinally grouped into six, based on the patterned arrangements of the lobes: (1) prothorax, (2) meso- and metathorax, (3) abdominal segment I, (4) abdominal segment II, (5) abdominal segments III–VII, and (6) abdominal segment VIII (anal segment). Each square partitioned by double lines in a row denotes the integument on the dorsal (dl), lateral (la), ventral (vl) sides of the corresponding segment(s). Each black dot symbolizes a cuticular lobe, of which position/size in a given space express the relative position/size of the lobe. Anal papillae are not shown. Lobe forms, auxiliary outgrowths, and relative length of segments are not shown here (see each species' own description). Each taxon name is abbreviated. For G and I, diagrams are based on the description in Brodo (1967) and Peus (1952), respectively; caution is needed when these are compared with the species examined herein (A–F, I–K), because the lobe characteristics could be treated differently in the previous studies. For K, a single lobe is present at the location of asterisk (*) only in the abdominal segment VII but not in the other segments.
Figure 18 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 18. Biology and structures of Phalacrocera replicata and P. tipulina. (A–B) P. replicata. (A) Specimen of lateinstar larva preserved in alcohol, dorsal view. (B) Characteristic lobes in anal segment, lateral view. (C–I) P. tipulina. (C) Specimen preserved in alcohol. (D) Late-instar larva curling its posterior body anchored with anal segment the Sphagnum mosses. (E) Late-instar larva floating near water surface with ventral side up, anchoring its mandibles to a moss shoot. (F) Morphological features of anal segment, oblique lateral view. (G) Ultrastructure of ventral lobe in anal segment, SEM view. (H) Ultrastructure of accessory dorsal lobe, SEM view. Abbreviations: anp, anal papilla; dac, accessory dorsal lobe; dl, dorsal lobe; dm, dorsomedial lobe; spd, spiracular disc; vl, ventral lobe. Scale (except G and H) = 1 mm.
Figure 4 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 4. Coloration and patterning of larval Cylindrotominae. (A) Dissected integuments of larvae with a green hue of L. brevipecten (left) and L. mikado (right). Note that there is a marked difference in integument colouration between them and that L. mikado has a yellowish tint. (B) Final-instar larva of Cylindrotoma japonica drowned in a wet spot on a leaf. The transparency of the integument is evident, with a shiny, silvery ventral side. (C–D) Colour dimorphism in Liogma mikado. (C) Late-instar larva of Liogma mikado with a green hue, blending in well in a tuft of Plagiothecium euryphyllum (Plagiotheciaceae). (D) Late-instar individual with a brown hue, occurring on the same moss patch as (C).
Figure 7 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 7. Ultrastructure of dorsal integument, SEM views. Dorsal integument with elongated cuticular lobes of abdominal segment at larval stage. Cylindrotoma japonica (A–C). (A) General dorsal integument. (B) Dorsal elongated lobe. (C) Ditto, closer view. Liogma brevipecten (D–F). (D) General dorsal integument. (E) Dorsal elongated lobe, lateral side. (F) Ditto, frontal side. Phalacrocera tipulina (G–I). (G) General dorsal integument to which diatoms and debris are sparsely attached. (H) Ditto, closer view. (I) Dorsal elongated lobe. Scales are shown in each image.
Figure 2 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 2. Eggs of Cylindrotominae (Cylindrotomidae). (A) Liogma brevipecten, dorsal (left) and ventral sides (right); micropyle at the distal end (black arrowhead) and possess a lateral adhesive region (white arrowhead). (B) Liogma brevipecten on the lower side of a liverwort thallus of Conocephalum conicum (Conocephalaceae). (C) Triogma kuwanai, on a dicot shoot. Scale = 500 µm.
Figure 1 in Moss mimesis par excellence: integrating previous and new data on the life history and larval ecomorphology of long-bodied craneflies (Diptera: Cylindrotomidae: Cylindrotominae)
Figure 1. Life history of Cylindrotominae. (A) First-instar larva of Triogma kuwanai consuming fluid within a leaf of Plagiomnium vesicatum (Mniaceae), dorsal view; cells devoid of chlorophyll (black arrowheads) indicate the piercing-andsucking feeding method. (B) Final-instar larva of Liogma brevipecten chewing a leaf margin of Rhizomnium tuomikoskii (Mniaceae), lateral view; note that the head capsule is fully retracted within the lip-like cuticular lobe. (C) Pupa of Liogma brevipecten with a green hue and displaying transverse black stripes in abdominal segments, dorsal view. (D) Copulating couple of Liogma mikado on moss tufts; the female, on the left, was dragged out of the pupal exuvium by the male and thus the body has not been completely sclerotised. (E) Leaf of Stellaria (Caryophyllaceae) with two characteristic incisions in the epidermis of the lower leaf surface (white arrowheads) due to endophytic oviposition; the eggs are absent. (F) Egg of L. mikado laid on a shoot of Hylocomnium splendens (Hylocomniaceae). (G) Larva of C. japonica, which is being preyed upon by what is presumably a third-instar nymph of Himacerus apterus (Hemiptera: Nabidae). Scale = 1 mm.
Density-by-diet interactions during larval development shape adult life-history trait expression and fitness in a polyphagous fly
<p><span>Habitat quality early in life determines individual fitness, with possible long-term evolutionary effects on groups and populations. In holometabolous insects, larval ecology plays a major role in determining the expression of traits in adulthood, but how ecological conditions during larval stage interact to shape adult life-history and fitness, particularly in non-model organisms, remains subject to scrutiny. Consequently, our knowledge of the interactive effects of ecological factors on insect development is limited. Here, using the polyphagous fly <i>Bactrocera tryoni</i>, we conducted a fully-factorial design where we manipulated larval density and larval diet (protein-rich, standard, and sugar-rich) to gain insights into how these ecological factors interact to modulate adult fitness. As expected, a protein-rich diet resulted in faster larval development, heavier and leaner adults that were more fecund compared with standard and sugar-rich diets, irrespective of larval density. Females from the protein-rich larval diet had overall higher reproductive rate (i.e., eggs per day) than females from other diets, and reproductive rate decreased linearly with density for females from the protein-rich but non-linearly for females from the standard and sugar-rich diets over time. Surprisingly, adult lipid reserve increased with larval density for adults from the sugar-rich diet (as opposed to decreasing, as in other diets), possibly due to a stress-response to an extremely adverse condition during development (i.e., high intraspecific competition and poor nutrition). Together, our results provide insights into how ecological factors early in life interact and shape the fate of individuals through life-stages in holometabolous insects. </span></p>
Dispersal and life history of brown widow spiders in dated invasive populations on two continents
<p>Theory and empirical work suggest that behaviours such as dispersal and exploration are predictors of invasive success, and that behaviours may shift predictably after invasive populations have established and spread. However, there are limited data on temporal patterns in the distribution of behavioural traits linked to the timeline of establishment of invasive species. We examine dispersal and exploration, along with life history traits that may be linked to behaviour, across multiple invasive populations of the brown widow spider (<i>Latrodectus geometricus</i>). This global invader has established populations across the United States and Israel. Using this temporal and spatial variation, we tested predictions about changes in suites of traits over establishment time. We compared trait distributions of four U.S. populations of <i>L. geometricus</i> to patterns in four populations in Israel. We predicted that selective filters during the invasion process would result in more dispersive, more exploratory spiders that are larger and more fecund in recently established populations, but, if tradeoffs occur, dispersal would be favoured at the expense of fecundity and size in recent populations. We found more frequent and faster dispersal in more recently established populations in Israel, but not the United States. Spiders in more recently established populations in Israel were larger than those in older populations, but there were no consistent patterns across U.S. populations. However, there was evidence in both the U.S. and Israel for differing tradeoffs among fecundity, dispersal, and size. In more recently-established populations, spiders had lower fecundity than expected based on body size, but were more variable in resource allocation to egg sacs. The results suggest that in some populations, trade-offs underlying dispersal, fecundity, and body size are shaped by the time interval, and thus the number of generations, since establishment, with implications for the role of evolutionary processes in invasion success.</p>
Data from: The relationship between pathogen life history traits and metapopulation dynamics
<p>Plant pathogen traits, such as transmission mode and overwintering strategy, may have important effects on dispersal and persistence, and drive disease dynamics. Still, we lack insights into how life-history traits influence spatiotemporal disease dynamics.</p> <p>We adopted a multifaceted approach, combining experimental assays, theory and field surveys, to investigate whether information about two pathogen life-history traits, infectivity and overwintering strategy, can predict pathogen metapopulation dynamics in natural systems. For this, we focused on four fungal pathogens (two rust fungi, one chytrid fungus and one smut fungus) on the forest herb <i>Anemone nemorosa.</i></p> <p>Pathogens infecting new plants mostly via spores (the chytrid and smut fungi) had higher patch occupancies and colonization rates than pathogens mainly causing systemic infections and overwintering in the rhizomes (the two rust fungi). While the rust fungi more often occupied well-connected plant patches, the chytrid and smut fungi were equally or more common in isolated patches. Host patch size was positively related to patch occupancy and colonization rates for all pathogens.</p> <p>Predicting disease dynamics is crucial to understand the ecological and evolutionary dynamics of host-pathogen interactions, and to prevent disease outbreaks. Our study shows that combining experiments, theory and field observations is a useful way to predict disease dynamics.</p>
Pacific Parasites Data - Life history mediates the association between parasite abundance and geographic features
<p>1. Though parasites are ubiquitous in marine ecosystems, predicting the abundance of parasites present within marine ecosystems has proven challenging due to the unknown effects of multiple interacting environmental gradients and stressors. Furthermore, parasites often are considered as a uniform group within ecosystems despite their significant diversity.</p> <p>2. We aim to determine the potential importance of multiple predictors of parasite abundance in coral reef ecosystems, including reef area, island area, human population density, chlorophyll-a, host diversity, coral cover, host abundance, and island isolation.</p> <p>3. Using a model selection approach within a database of more than 1200 individual fish hosts and their parasites from 11 islands within the Pacific Line Islands archipelago, we reveal that geographic gradients, including island area and island isolation, emerged as the best predictors of parasite abundance.</p> <p>4. Life history moderated the relationship; parasites with complex life cycles increased in abundance with increasing island isolation, while parasites with direct life cycles decreased with increasing isolation. Direct life cycle parasites increased in abundance with increasing island area, though complex life cycle parasite abundance was not associated with island area.</p> <p>5. This novel analysis of a unique dataset indicates that parasite abundance in marine systems cannot be predicted precisely without accounting for the independent and interactive effects of each parasite's life history and environmental conditions.</p>
Data from: Life histories as mosaics: plastic and genetic components differ among traits that underpin life-history strategies
<p>Life-history phenotypes emerge from clusters of traits that are the product of genes and phenotypic plasticity. If the impact of the environment differs substantially between traits, then life histories might not evolve as a cohesive whole.</p> <p>We quantified the sensitivity of components of the life history to food availability, a key environmental difference in the habitat occupied by contrasting ecotypes, for 36 traits in fast-and slow-reproducing Trinidadian guppies. Our dataset included six putatively independent origins of the slow-reproducing, derived ecotype.</p> <p>Traits varied substantially in plastic and genetic control. Twelve traits were influenced only by food availability (body lengths, body weights), five only by genetic differentiation (inter-birth intervals, offspring sizes), ten by both (litter sizes, reproductive timing), and nine by neither (fat contents, reproductive allotment). Ecotype-by-food interactions were negligible. The response to low food was aligned with the genetic difference between high- and low-food environments, suggesting that plasticity was adaptive.</p> <p>The heterogeneity among traits in environmental sensitivity and genetic differentiation reveals that the components of the life history may not evolve in concert. Ecotypes may instead represent mosaics of trait groups that differ in their rate of evolution.</p>
Data for: Warmer temperatures limit the effects of antidepressant pollution on life history traits
<p>Pharmaceutical pollutants pose a threat to aquatic ecosystems worldwide. Yet, few studies have considered the interaction between pharmaceuticals and other chronic stressors contemporaneously, even though the environmental challenges confronting animals in the wild seldom, if ever, occur in isolation. Thermal stress is one such environmental challenge that may modify the threat of pharmaceutical pollutants. Accordingly, we investigated how fluoxetine (Prozac), a common psychotherapeutic and widespread pollutant, interacts with temperature to affect life-history traits in the water flea, <i>Daphnia magna</i>. We chronically exposed two genotypes of <i>Daphnia</i> to two ecological relevant concentrations of fluoxetine (30ng/L and 300ng/L) and a concentration representing levels used in acute toxicity tests (3000ng/L), and quantified the change in phenotypic trajectories at two temperatures (20°C and 25°C). Across multiple life-history traits, we found that fluoxetine exposure impacted the fecundity, body size and intrinsic growth rate of <i>Daphnia</i> in a non-monotonic manner at 20°C, and often in genotypic-specific ways. At 25°C, however, the life-history phenotypes of individuals converged under the widely varying levels of fluoxetine, irrespective of genotype. Our study underscores the importance of considering the complexity of interactions that can occur in the wild when assessing the effects of chemical pollutants on life-history traits.</p>
Carry-over effects of larval food stress on adult energetics and life history in a nectar-feeding butterfly
<p>Stressful juvenile developmental conditions can affect performance and fitness later in life. In holometabolous insects such as butterflies, development under stressful conditions may lead to smaller adult size, lower reproductive output and shorter lifespan. However, how larval developmental stress affects energy intake and expenditure in adult individuals is poorly understood.</p> <p>We subjected last-instar larvae of <i>Speyeria mormonia</i> Edwards (Lepidoptera: Nymphalidae) to periodic dietary restriction (DR) to examine the allocation of energy and nutrients among different life-history processes. We measured adult food intake, resting metabolic rate (RMR), metabolic flight capacity, lifespan, and reproductive output. Consistent with pressure to disperse from a poor environment while maintaining offspring number, we predicted that stressed individuals would have increased adult food intake and higher flight capacity.</p> <p>Adult body size was strongly reduced. Contrary to predictions, we found no compensatory adult feeding. Mass-adjusted flight metabolic rate was reduced, suggesting poor dispersal capacity. Larval DR did not affect adult lifespan, nor did the rate of metabolic senescence change. Larval DR did affect RMR, as stressed females had a steeper slope between RMR and body mass, which may reflect differences in physiological activity due to condition.</p> <p>Fecundity decreased less than predicted based on body mass. Instead of investing in flight capacity, females increased relative allocation to reproduction, which may partly buffer against poor environmental conditions.</p> <p>Understanding the interplay of energy acquisition and allocation to life history traits across the life cycle is vital for predicting responses to environmental change.</p>
Data from: Genetic analysis of life-history constraint and evolution in a wild ungulate population
Trade-offs among life-history traits are central to evolutionary theory. In quantitative genetic terms, trade-offs may be manifested as negative genetic covariances relative to the direction of selection on phenotypic traits. Although the expression and selection of ecologically important phenotypic variation are fundamentally multivariate phenomena, the in situ quantification of genetic covariances is challenging. Even for life-history traits, where well-developed theory exists with which to relate phenotypic variation to fitness variation, little evidence exists from in situ studies that negative genetic covariances are an important aspect of the genetic architecture of life-history traits. In fact, the majority of reported estimates of genetic covariances among life-history traits are positive. Here we apply theory of the genetics and selection of life histories in organisms with complex life cycles to provide a framework for quantifying the contribution of multivariate genetically based relationships among traits to evolutionary constraint. We use a Bayesian framework to link pedigree-based inference of the genetic basis of variation in life-history traits to evolutionary demography theory regarding how life histories are selected. Our results suggest that genetic covariances may be acting to constrain the evolution of female life-history traits in a wild population of red deer Cervus elaphus: genetic covariances are estimated to reduce the rate of adaptation by about 40%, relative to predicted evolutionary change in the absence of genetic covariances. Furthermore, multivariate phenotypic (rather than genetic) relationships among female life-history traits do not reveal this constraint.
Histological and life history data for small-bodied mammals from: Multituberculate mammals show evidence of a life history strategy similar to that of placentals, not marsupials
<p>The remarkable evolutionary success of placental mammals has been partly attributed to their reproductive strategy of prolonged gestation and birthing of relatively precocial, quickly weaned neonates. Although this strategy was conventionally considered derived relative to that of marsupials with highly altricial neonates and long lactation periods, mounting evidence has challenged this view. Until now, the fossil record has been relatively silent on this debate, but here we find that proportions of different bone tissue microstructures in the femoral cortices of small extant marsupials and placentals correlate with length of lactation period, allowing us to apply this histological correlate of reproductive strategies to Late Cretaceous and Paleocene members of Multituberculata, an extinct mammalian clade that is phylogenetically stemward of Theria. Multituberculate bone histology closely resembles that of placentals, suggesting that they had similar life history strategies. That a stem-therian clade exhibits evidence of placental-like life histories supports the hypothesis that intense maternal-fetal contact characteristic of placentals is ancestral for therians. Alternatively, multituberculates and placentals may have independently evolved prolonged gestation and abbreviated lactation periods. Our results challenge the hypothesis that the rise of placental mammals was driven by unique life history innovations, and shed new light on early mammalian diversification.</p>
Anthropogenic light and noise affect the life histories of female Gryllus veletis field crickets
<p>Adaptive plasticity often offsets the negative effects of rapid environmental change. However, anthropogenic stressors like noise and artificial light at night (ALAN) are often unlike those environments experienced ancestrally, making the resulting responses of individuals potentially maladaptive or less predictable. Further uncertainty stems from few studies exploring how the two anthropogenic stressors may interact to influence individual responses. Here we reared female Gryllus veletis field crickets in traffic noise, ALAN, both, or neither to assess how each environment impacted their development, mating behaviors, and reproductive output. We found modest to no effect of anthropogenic stressors on development time or adult size, but pronounced effects on adult behaviors. Females reared in noise in any capacity were more responsive to advertising males and mated with them faster, and females reared in any anthropogenic stressor retained spermatophores longer. More significantly, any anthropogenic stressor reduced the lifetime fitness of females through reduced oviposition, hatching success, both, or reduced offspring size at hatching. However, we did not find decreased fitness of females reared with both anthropogenic stressors relative to those reared with just one. Our results highlight how novel anthropogenic stressors may impact populations, but whether individuals can adapt may depend on an interplay between development, mating behaviors, and reproductive output. </p>
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