Blatta Lateralis Research Articles

Composition and abundance of cockroaches in traditional markets of Purwokerto City, Indonesia

Abstract. Ambarningrum TB, Widhiono I, Kusmintarsih ES, Pratiknyo H, Haryanto T, Hasyifah FN. 2024. Composition and abundance of cockroaches in traditional markets of Purwokerto City, Indonesia. Biodiversitas 25: 2773-2779. Markets with high human activity and abundant food are ideal conditions for cockroaches. This study aimed to investigate the composition and abundance of cockroaches infesting three markets in Purwokerto City, Central Java, Indonesia. To achieve this objective a survey method with random sampling used baiting traps and hand collection. The analysis used the Shannon-Wiener index (H'), Evenness index, relative abundance, and density index. The results showed that three cockroach families were identified, namely Blattellidae, Blattidae, and Blaberidae. The cockroaches found in markets 1 and 3 consisted of five species, namely Blattella germanica (Linnaeus, 1767), Periplaneta americana (Linnaeus, 1758), Blatta lateralis (Serville, 1838), Nauphoeta cinerea (Olivier, 1789), and Pycnoscelus surinamensis (Linnaeus, 1758), while in Market 2 there were only three species, namely B. germanica, P. americana, and N. cinerea. The total population were 2467, 81, and 3627 individuals in Market 1, 2, and 3 respectively. The B. germanica predominated in Markets 1 and 2, while N. cinerea dominated in Market 3. Furthermore, density levels varied across markets, showing differing infestation intensities. The study explained the importance of integrated pest management strategies and regular monitoring to control cockroaches population effectively. These results provide valuable insights for local pest control efforts aimed at maintaining hygiene and health standards in market environments.

Comparative Efficacy of Pyrethroid-Based Paints against Turkestan Cockroaches.

The Turkestan cockroach, Periplaneta lateralis (Walker), is an invasive urban pest prevalent in dry areas of the southwestern United States. Treatment with liquid spray formulations containing insecticides is the most conventional method to decrease Turkestan cockroach population abundance around buildings. Intensive application of insecticide treatments near natural environments has prompted concerns regarding the impacts on non-target aquatic and terrestrial ecosystems. Technologies embedding insecticides in a paint matrix have successfully been used for the long-term reduction in disease-vector populations in tropical areas. Here, we evaluated the potential effectiveness of three pyrethroid-based paints against Turkestan cockroach nymphs on common surfaces inhabited by this species. Turkestan cockroaches continuously exposed for 1 h to 1-month aged alphacypermethrin and deltamethrin paints applied to concrete, metal, or PVC caused moderate to high mortality. Evaluations using choice boxes indicated that deltamethrin and transfluthrin paints had combined lethal and repellent effects on cockroaches. Alphacypermethrin also caused repellency and killed cockroaches rapidly. We discuss the implications of these findings on cockroach control practices.

Impact of live food on the reproductive performance of the Batur toad, <i>Bufotes baturae</i> (Stöck, Schmid, Steinlein et Grosse, 1999) in captivity

The work is devoted to the study of the reproductive performance of a narrow areal triploid toads (Batur toad, Bufotes baturae) reared on different live food (Turkestan and marble cockroaches). Material for the work was obtained over three breeding seasons. In the first breeding season, the number of pairs reared on the Turkestan cockroach (Shelfordella lateralis) was 7 (64%) and on the marbled cockroach (Nauphoeta cinerea) – 2 (18%). In the second and third seasons, the numbers were 8 (89%) and 11 (100%) respectively. The average fecundity of females fed on the Turkestan cockroach ranged from 3149 to 3300 eggs over three seasons, while that of females fed on the marbled cockroach ranged from 2472 to 2630 eggs. However, the juveniles from the group reared on marbled cockroach were superior in length to the prelarvae, as well as in length and weight to the post-metamorphic juveniles. Thus, there was no clear advantage in reproductive performance in animals consuming different diets. Both insect species were highly effective when fed to Baturian toads under laboratory conditions.

ANTI-APOSTATIC FEEDING BEHAVIOR IN TWO SPECIES OF ASSASSIN BUG, THE WHITE-SPOTTED ASSASSIN BUG PLATYMERIS BIGUTTATUS AND RED-SPOTTED ASSASSIN BUG PLATYMERIS RHADAMANTHUS (HEMIPTERA: REDUVIIDAE)

Abstract Predator-prey relationships are a driving force when examining community ecology. One question in predator-prey interactions is how a predator may respond to novel prey phenotypes, a form of frequency dependent prey selection. A predator may selectively target or avoid the novel prey, a behavior referred to as anti-apostatic or apostatic selection respectively. We examined apostatic prey selection by observing feeding behavior in two species of assassin bugs (Hemiptera: Reduviidae), the white-spotted assassin bug (Platymeris biguttatus) and the red-spotted assassin bug (Platymeris rhadamanthus) which were fed unmodified and modified (novel) phenotypes of Turkistan cockroaches, Blatta lateralis (Blattodea: Blattidae). The two species of assassin bugs represent either generalist (P. biguttatus) or specific feeders (P. rhadamanthus). We hypothesized that the generalist feeder would engage in anti-apostatic feeding while the specific feeder would engage in apostatic feeding. Our results indicated that there was no difference in feeding behavior between the two species, however an overall trend of apostatic feeding was observed in response to two of the four novel prey phenotypes. Factors beyond prey phenotype may also be influencing feeding choice in these insects. While the two predator species did not exhibit different feeding behaviors, the observation of apostatic feeding in this genus suggest an overall trend of utilizing specific prey images in feeding.

Coconut fatty acids exhibit strong repellency and week-long efficacy against several urban pest arthropods of the southwestern United States.

The southwestern United States is home to a variety of arthropods including Turkestan cockroaches, Blatta lateralis (Walker); hematophagous bugs, Tritoma rubida (Uhler); and Arizona bark scorpions, Centruroides sculpturatus (Ewing). These arthropods cause medical concern when they become established around homes and/or invade indoors. Traditionally, the management of these pests has relied primarily on the use of chemical insecticides; however, they offer poor prospects for control owing to their lack of efficacy as well as the effects of insecticides on humans and the environment. Botanical repellents are an option that has not been fully investigated for the management of these pests. Here, we investigated the behavioral responses of common urban pests of the southwestern USA to recently discovered coconut fatty acids (CFAs), to establish the potential use of these compounds as repellents. Fresh residues of CFA mixture (CFAm) and their constituents caprylic acid, capric acid, capric acid methyl ester, lauric acid, and lauric acid methyl ester, tested at a concentration of 1 mg cm-2 , strongly repelled all arthropods. The repellent activity of CFAm lasted for at least 7 days, and the addition of lavender oil, used as an odor-masking agent, did not decrease this effect. Concentrations of CFAm ten times lower (0.1 mg cm-2 ) still repelled Turkestan cockroaches, and concentrations 100 times lower (0.01 mg cm-2 ) repelled T. rubida and scorpions. CFAm and some of their constituents are efficacious, economical, and logistically feasible for inclusion in integrated pest management programs for these important urban pests of the southwestern USA. This article is protected by copyright. All rights reserved.

Potential of the oothecal parasitoid Aprostocetus hagenowii (Hymenoptera: Eulophidae) as a biological control agent for the Turkestan cockroach (Blattodea: Blattidae).

The Turkestan cockroach, Blatta lateralis (Walker), is a peridomestic pest of growing concern in the US Southwest. The parasitoid Aprostocetus hagenowii (Ratzburg) is used in IPM programs targeting other blattid cockroach species and may aid in B. lateralis suppression. Information about the ability of A. hagenowii to parasitize B. lateralis is lacking. A no-choice host-switching experiment was used to test A. hagenowii acceptance of B. lateralis oothecae, and a multigenerational no-choice experiment was used to determine the suitability of B. lateralis as a host for A. hagenowii over several months of rearing. Periplaneta americana (L.) (Blattodea: Blattidae), the preferred host of A. hagenowii, and Blatta orientalis L., a known host and relative of B. lateralis, were used for comparison. Development time was similar among hosts and generations (P > 0.05). Parasitism success and proportion of female progeny declined significantly with subsequent generations on both Blatta spp. (parasitism success: χ2 = 14.916; df = 2; P = 0.001; proportion female: H = 6.364; df = 2; P = 0.041). These results suggest that A. hagenowii may initially aid in suppression of B. lateralis, but an overall decline in fitness will require repeated releases or provisioning of P. americana oothecae. Development of a strain more suitable for B. lateralis control may be possible via selection from laboratory strains or through use of wild A. hagenowii from areas where B. lateralis is present.

Taurine content of insects used as feed

Taurine (2-aminoethane sulfonic acid) is an important bioactive compound which certain living organisms cannot synthesise metabolically, thus requiring its dietary supplementation for normal physiological processes. As recent research has shown insects to be a suitable high-quality feed source this study analysed taurine content in ten commercially available insect species (Alphitobius diaperinus,Acheta domesticus,Blaberus craniifer,Blatta lateralis,Gryllus assimilis,Hermetia illucens,Musca domestica,Periplaneta americana,Schistocerca gregaria, andTenebrio molitor) by an electrophoretic method. Levels of total nitrogen substances (Kjeldahl method) and chitin (spectrophotometric method after hydrolysis to glucosamine) present in the insect samples were also determined. Amongst the samples,G. assimilis contained the highest levels of taurine (121.0±10.2 mg/100 g fresh weight; 436±34 mg/100 g dry matter). On the contrary, the lowest taurine level was detected inS. gregaria (5.4±0.6 mg/100 g fresh weight; 15±2 mg/100 g dry matter). Taurine levels were determined for the whole insect and calculated per protein content. There was no significant correlation between the taurine content and the insect order or developmental stage of insects. Though it has been proved that insect species are variable sources of taurine, the most taurine-rich insect species are comparable with conventionally used feeding ingredients such as fishmeal, animal muscles and visceral tissue.

Link between Energy Investment in Biosynthesis and Proteostasis: Testing the Cost-Quality Hypothesis in Insects.

The energy requirement for biosynthesis plays an important role in an organism's life history, as it determines growth rate, and tradeoffs with the investment in somatic maintenance. This energetic trait is different between painted lady (Vanessa cardui) and Turkestan cockroach (Blatta lateralis) due to the different life histories. Butterfly caterpillars (holometabolous) grow 30-fold faster, and the energy cost of biosynthesis is 20 times cheaper, compared to cockroach nymphs (hemimetabolous). We hypothesize that physiologically the difference in the energy cost is partially attributed to the differences in protein retention and turnover rate: Species with higher energy cost may have a lower tolerance to errors in newly synthesized protein. Newly synthesized proteins with errors are quickly unfolded and refolded, and/or degraded and resynthesized via the proteasomal system. Thus, much protein output may be given over to replacement of the degraded new proteins, so the overall energy cost on biosynthesis is high. Consequently, the species with a higher energy cost for biosyntheses has better proteostasis and cellular resistance to stress. Our study found that, compared to painted lady caterpillars, the midgut tissue of cockroach nymphs has better cellular viability under oxidative stresses, higher activities of proteasome 20S, and a higher RNA/growth ratio, supporting our hypothesis. This comparative study offers a departure point for better understanding life history tradeoffs between somatic maintenance and biosynthesis.

Growth Rate and Thigmotactic Behavior of Turkestan Cockroach (Blatta lateralis) Under Different Illumination Conditions

Insects, including cricket, fly, locust, and cockroach species, exhibit growth and escape (thigmotactic) responses to aversive stimuli. This study aimed to investigate the growth rate and thigmotactic behavior of Turkestan cockroaches (Blatta lateralis) under different illumination conditions: natural (direct) sunlight, artificial white light, and dark control in Davao City, Philippines. In this study, gentle agitation of the container (i.e., wind puffs and food drops during feeding) stimuli stimulated B. lateralis, and the more they are exposed to natural (direct) sunlight and other bright displays, the lesser they survive, and their growths are. Thigmotaxis and body length were measured weekly starting on the 5th week of observation, utilizing the six experimentally nymphal organisms as subjects starting with 1.1 cm in size each organism to a 7″ x 55″ container with the 20 cm x 28 cm paper shelters folded within a 10° angle in a room with direct sunlight, a dark edge, and floor lit by a 60-W light bulb with 1 inch above the center of the container, and plain darkness. The results demonstrated that the organism’s selection from a finite set of preferred escape trajectories (ETs) could cause variation in ETs where overall thigmotactic stimuli response was higher and had the largest growth with a body length of 2.05 cm for nymphs placed under artificial white light. In conclusion, Turkestan cockroaches exhibited flight responses even to impending and particularly gentle agitation stimuli and had a more dark or natural light condition survival rate.

Full-fat insect meals in ruminant nutrition: in vitro rumen fermentation characteristics and lipid biohydrogenation

BackgroundThe most used protein sources in ruminant nutrition are considered as having negative impacts in terms of environmental sustainability and competition with human nutrition. Therefore, the investigation of alternative and sustainable feedstuffs is becoming a priority in ruminant production systems.ResultsThis trial was designed to evaluate eight full-fat insect meals (Acheta domesticus – ACD; Alphitobius diaperinus – ALD; Blatta lateralis – BL; Gryllus bimaculatus – GB; Grylloides sygillatus – GS; Hermetia illucens – HI; Musca domestica – MD; and Tenebrio molitor – TM) as potential protein and lipid sources in ruminant nutrition. Fermentation parameters and fatty acids (FA) of rumen digesta after 24-h in vitro ruminal incubation of the tested insect meals were measured and compared with those of three plant-based meals (soybean meal, rapeseed meal and sunflower meal) and fishmeal (FM). Similarly to FM, the insect meals led to a significantly lower total gas production (on average, 1.75 vs. 4.64 mmol/g dry matter—DM), methane production (on average, 0.33 vs. 0.91 mmol/g DM), volatile FA production (on average, 4.12 vs. 7.53 mmol/g DM), and in vitro organic matter disappearance (on average, 0.32 vs. 0.59 g/g) than those observed for the plant meals. The insect meals also led to lower ammonia of rumen fluid, when expressed as a proportion of total N (on average, 0.74 vs. 0.52 for the plant and insect meals, respectively), which could be an advantage provided that intestinal digestibility is high. Differences in ruminal fermentation parameters between the insect meals could be partially explained by their chitin, crude protein and ether extract contents, as well as by their FA profile. In particular, high content of polyunsaturated FA, or C12:0 (in HI), seems to partially inhibit the ruminal fermentations.ConclusionsThe tested full-fat insect meals appear to be potentially an interesting protein and lipid source for ruminants, alternative to the less sustainable and commonly used ones of plant origin. The FA profile of the rumen digesta of ACD, ALD, GB, GS and TM, being rich in n-6 polyunsaturated FA, could be interesting to improve the quality of ruminant-derived food products.

Potential use of synthetic and natural aromatic mixtures in prevention from Shelfordella lateralis сockroaches

Attractive and repellent properties of many household chemicals may be used to combat synantrophic insects, such as cockroaches. In the natural environment, Shelfordella lateralis (Walker, 1868) (Blattodea, Blattidae) lives in the area spanning Central Asia to North Africa. Furthermore, in many tropical and subtropical countries, it is common in human accomodations. In the laboratory conditions, we determined reaction of cockroaches to aromatic mixtures and medicinal plants often used in households. Attractiveness coefficient was the lowest for cosmetic mixtrures Tutti-fruti and Verbena and Bamboo; other cosmetic aromatizers did not repell this insect (Lilac, Mango) or repelled it poorly (Grapefruit, Amaretto, Pine). Food additives that significantly repelled Sh. lateralis are Apricot, Barberry and Kiwi and lower effects were produced by Biscuit, whereas Vanilla flavouring had no repellent effect. Mixtures for vaping Strawberry pie, Pear, Frozen forest, Irish Cream and Blue Magic exerted strong repellent effects on cockroaches. Low repellent effect on Sh. lateralis were exerted by vaping mixtures Pancakes with Honey, Turkish Tobacco and Grapefruit. No significant effects on the number of cockroaches were exerted by vaping mixtures Vanilla, Club Ice Cream, Blueberry Smoke, Mojito, Chocolate, Apple, Mint and Walnut. Out of the fishing lures, the strongest repellent effects on Sh. lateralis were taken by Blood Worm, Onion and Honey, and weaker effects were exerted by Corn and Vanilla. Imagoes of Sh. lateralis were most significantly repelled by essential oils from jojoba, eucalyptus, daisy, tee tree, Cao Sao Vang balsam, and also fir essential oil. Neither luring nor repellent effects on imagoes of Sh. lateralis were displayed by essential oils from lemon, aloe, peppermint and mandarin. Dry medicinal plants repelled imagoes of Sh. lateralis: inflorescences of Calendula officinalis, leaves of Artemisia absinthium, flowers of Jasminum officinale, leaves of Origanum vulgare, inflorescences of Matricaria chamomilla, inflorescences of Crataegus monogyna, leaves of Mentha x piperita, inflorescences of Achillea millefolium, leaves of Hypericum perforatum, leaves of Aristolochia clematitis and inflorescences of Tanacetum vulgare. No repellent effects on Sh. lateralis were exerted by Chelidonium majus, inflorescences of Tilia cordata and inflorescences of Helichrysum arenarium. Thus, most (40 of 58, or 69.0%) of the tested aromatic substances and medicinal plants repelled synantrophic Turkestan cockroach, while a much smaller share (31.0%) neither significantly lured nor repelled them. No aromatic mixtures attracted Sh. lateralis in our experiment.

Comparative nutrient analysis of four species of cockroaches used as food for insectivores by life stage, species, and sex.

A variety of insects are fed to insectivorous animals; however, nutritional analyses are often limited to adult life stages. Four species of nymph and adult female and male cockroaches (Blaberus giganteus, Blaptica dubia, Blatta lateralis, and Gromphadorhina portentosa) were analyzed for moisture, crude protein (CP), acid detergent fiber (ADF), fat, ash, and mineral content. The small sample size of this study precluded statistical analyses, however comparatively, CP in adult B. lateralis and B. dubia was greater than the CP in nymphs of the same species. Adult and nymph B. dubia had the greatest CP (96.6% and 65.3%, respectively) compared to the other three species. Inversely, fat content in adult B. lateralis and B. dubia was lower than that of nymphs of the same species. All adults contained similar levels of ADF, yet adult B. giganteus had greater ADF than nymphs; conversely, B. lateralis and B. dubia adults had less ADF than nymphs. There were differences noted in mineral parameters among the four species and life stages. Adult B. giganteus had less Ca than G. portentosa, and the lowest Ca content of the four species of nymphs and adults analyzed. This study underscores the differences in nutrient content with respect to life stage and species in previously understudied cockroaches to improve nutrient intake in captive insectivores.

Environmentally sustainable feeding system for sea trout (Salmo trutta m. trutta): Live food and insect meal-based diets in larval rearing

Wild salmonid populations are successively decreasing due to environmental changes caused by excessive human activity or climate change. Thus, effective breeding and rearing programs are required that focus on nutritional strategies, including feeding behaviour and starter feeds composed of environmentally sustainable ingredients. In this study, a combined feeding system that included the addition of live food (Artemia salina for 0, 3 or 7 days), test diets (containing insect meals) and the control diet (fishmeal-based) was assessed. Two types of insect meals were used, with one from the larval stage of insects (mealworm and black soldier fly) and the other from the imago stage of insects (Turkestan cockroach and tropical house cricket). The study was carried out on sea trout (Salmo trutta m. trutta) larvae, and the fish growth performance, survival and condition were evaluated during a 60-day feeding trial. Fish body weight, length and condition (CF) were similar in the groups fed the control diet and the groups fed the larval stages of insects. The feed conversion ratio (FCR) was comparable in all treatments. The highest weight gain (WG), specific growth rate (SGR) and survival rate (SR) were observed in the fish fed the diet that included larval insect meal. The application of live food did not significantly affect the rearing results, although the type of insect meal had a crucial impact on fish rearing. In summary, diets containing 20 % insect meal from the larval stage may be used as an effective feed component for juvenile fish.

The effect of illumination with different light wavelengths on the orientation of Turkestan cockroach, Blatta lateralis (Walker,1868) (Blattodea: Blattidae)

Bu calismada, farkli dalga boylarina (kirmizi, yesil, sari, mavi, beyaz ve karanlik) sahip isinlarin Turkistan hamambocegi, Blatta lateralis (Walker,1868) (Blattodea: Blattidae)’in yonelimi uzerindeki etkisi arastirilmistir. Calisma, 2019 yilinda Bursa Uludag Universitesi’nde laboratuvar kosullarinda yurutulmustur. Yonelim denemelerinde, ergin hamambocekleri uc farkli isik siddetine (25, 250 ve 2500 luks) maruz birakilmistir. Denemeler 6-kollu ve 2-kollu secimli olarak yurutulmustur. Tum denemelerde 3 tekerrur ve her tekerrurde 100 birey kullanilmistir. Elde edilen veriler, isik siddetine bagli olarak farkli dalga boyuna sahip isinlara yonelim hassasiyetinin artabilecegini gostermektedir. Ozellikle, alti -kollu ve iki -kollu denemede, 2500 luks siddetinde mavi isik uygulandiginda, hamamboceginin yonelimi en dusuk seviyede olup, sirasiyla, %0.9 ve %1.8 oraninda olmustur. Genel olarak en yuksek yonelim, tum denemelerde karanlik (kontrol) odaciga olmustur. Ayrica tum luks degerleri altinda kirmizi isiga yonelim, yesil, sari, mavi ve beyaz isiga gore daha fazla olmustur. Bu calisma sonucunda, mavi isigin hamambocekleri uzerinde kacirici bir etki gosterebilecegi, kirmizi isigin ise diger dalga boylarina gore daha cekici olabilecegi tespit edilmistir. Yapilan bu calismalar, hamamboceklerine karsi kullanilan kimyasallarin yerini alabilecek insan sagligina ve cevreye zararsiz olan alternatif bir mucadele metodunun gelistirilmesinde faydali olabilir.

Comparative Efficacy of Residual Insecticides against the Turkestan Cockroach, Blatta lateralis, (Blattodea: Blattidae) on Different Substrates.

The Turkestan cockroach, Blatta lateralis (Walker) is an invasive urban pest prevalent throughout the Southwestern United States. Despite the presence of this cockroach in peridomestic areas, there is limited information on strategies that can be utilized by pest management professionals (PMPs) to effectively manage populations of this pest. We evaluated the efficacy of dry residues of liquid insecticides commonly used for household and structural insect pest control: Tandem (0.10% thiamethoxam, 0.03% lambda-cyhalothrin), Transport GHP (0.05% acetamiprid, 0.06% bifenthrin), Temprid SC (0.10% imidacloprid, 0.05% beta-cyfluthrin), Demand CS (0.06% lambda-cyhalothrin), Talstar P (0.06% bifenthrin), and Phantom (0.5% chlorfenapyr) on three different substrates against Turkestan cockroach nymphs. Except for Phantom and Talstar P, all insecticide formulations killed 100% of the cockroaches on concrete, 89–100% on tile, and 77–100% on wood within 4 days. The rate of cockroach mortality varied according to the substrates to which they were exposed. Temprid SC and Transport GHP killed cockroaches faster on tile than wood. Tandem provided a faster mortality rate than Transport GHP and Temprid SC on concrete. Demand CS and Tandem killed cockroaches at similar rates on the three substrates. This study provides information to guide PMPs in their selection of insecticide formulations for the management of Turkestan cockroach infestations.

Assessment of the susceptibility of the Turkestan cockroach, Blatta lateralis to Turkish isolates of entomopathogenic nematodes

Two Turkish entomopathogenic nematodes isolates, Steinernema feltiae-KV06 (Filipjev) (Rhabditida: Steinernematidae) and Heterorhabditis bacteriophora-EO7 (Rhabditida: Heterorhabtidae), were tested against the cockroach, Blatta lateralis Walker (Blattodea: Blattidae) to determine their potential for its control. The isolates were obtained from Kelebekler Vadisi and Eğriova Nature Parks in Ankara Province, Turkey. These isolates were applied at concentrations of 100, 250, 500 and 1000 IJ/cm2 to B. lateralis nymphs in 9cm diameter Petri dishes. The mortalities were recorded at 2, 4, 6, 8, 10, 12 and 14 days after application. At 1000 IJs/cm2, S. feltiae-KV06 and H. bacteriophora-EO7 caused the highest mortality (100.0±0.0%) with an LT50 of 2.3 and 2.6 days, respectively, and an LT90 of 6.6 and 7.9 days, respectively. The lowest mortality rate caused by both species was at 100IJs/cm2 after 2 days of exposure (S. feltiae-KV06: 0.6±1.4; H. bacteriophora-EO7: 0.0±0.0). There was no significant difference in the efficacy of the isolates at all concentrations and for all time periods. The effectiveness of both isolates against this pest should be tested at different temperatures and humidities and on different surfaces such as ceramic, concrete and parquet.

The extremely low energy cost of biosynthesis in holometabolous insect larvae

The metabolic cost of growth, which quantifies the amount of energy required to synthesize a unit of biomass, is an important component of an animal’s ontogenetic energy budget. Here we investigated this quantity as well as other energy budget variables of the larvae of a holometabolous insect species, Vanessa cardui (painted lady). We found that the high growth rate of this caterpillar cannot be explained by its metabolic rate and the percentage of the metabolic energy allocated to growth; the key to understanding its fast growth is the extremely low cost of growth, 336 Joules/gram of dry mass.The metabolic cost of growth in caterpillars is 15–65 times lower than that of the endothermic and ectothermic species investigated in previous studies. Our results suggest that the low cost cannot be attributed to its body composition, diet composition, or body size. To explain the “cheap price” of growth in caterpillars, we assumed that a high metabolic cost for biosynthesis resulted in a high “quality” of cells, which have fewer errors during biosynthesis and higher resistance to stressors. Considering the life history of the caterpillars, i.e., tissue disintegration during metamorphosis and a short developmental period and lifespan, we hypothesized that an energy budget that allocates a large amount of energy to biosynthesizing high quality cells would be selected against in this species. As a preliminary test of this hypothesis, we estimated the metabolic cost of growth in larvae of Manduca sexta (tobacco hornworm) and nymphs of Blatta lateralis (Turkestan cockroach). The preliminary data supported our hypothesis.

Sera/Organ Lysates of Selected Animals Living in Polluted Environments Exhibit Cytotoxicity against Cancer Cell Lines.

Species of crocodiles and cockroaches can withstand high radiation, reside in unsanitary conditions, thrive on germ-infested feed, and are exposed to heavy metals, yet they are not reported to develop cancer. It has been postulated that such species have mechanisms to defend themselves against developing cancer. Here, selected species have been tested for potential cytotoxicity against selected cancer cell lines. In this study, various species of vertebrates and invertebrates were procured including Columba livia, Gallus gallus domesticus, Varanus salvator, Cuora kamamora amboinensis, Reticulatus malayanus, Oreochromis mossambicus, Rattus rattus, American bullfrog, Donax sp., Polymesoda coaxans, Tenebrio molitor, Lumbricus terrestris, Blatta lateralis, Grammostola rosea, and Penaeus monodon. Species were dissected and their organ lysates/sera/haemolymph were prepared. Cytotoxicity assays were performed using Prostate Cancer cells (PC3), Henrietta Lacks cervical adenocarcinoma cells (HeLa) and human breast adenocarcinoma cells (MCF7) as well as human keratinized skin cells (Hacat), by measuring lactate dehydrogenase release as an indicator for cell death. Growth inhibition assays were performed to determine the effects on cancer cell proliferation. Liquid Chromatography-Mass Spectrometry (LC-MS/MS) was performed for molecular identification. The results revealed that body lysates of Polymesoda coaxans demonstrated more than 99% growth inhibition of all cancer cell lines tested but not on normal Hacat cells. More importantly, the serum of M. reticulatus abolished growth and produced cytotoxicity. Hence these samples were subjected to Liquid Chromatography- Mass Spectrometry (LC-MS/MS), which detected 81 small molecules and putatively identified 20 molecules when matched against the METLIN database. Out of 1094 peptides, 21 peptides were identified, while 1074 peptides were categorized as novel peptides. Based on properties such as peptide amino acid composition, binary profile, dipeptide composition and pseudo-amino acid composition, 306 potential peptides were identified. To our knowledge, here for the first time, we report a comprehensive analysis of sera exhibiting cytotoxicity against cancer cell lines tested and identified several molecules using LC-MS/MS.

The Utilization of Full-Fat Insect Meal in Rainbow Trout (Oncorhynchus mykiss) Nutrition: The Effects on Growth Performance, Intestinal Microbiota and Gastrointestinal Tract Histomorphology

Abstract A 71-day-long experiment was conducted to evaluate the inclusion of 20% Hermetia illucens (HI) meal; Tenebrio molitor (TM) meal; Gryllodes sigillatus (GS) meal; and Blatta lateralis (BL) meal in comparison to a control diet without any insect-based materials that used fish meal as the main source of protein. A total of 1950 rainbow trout juveniles (53.39 ± 3.74 g) were used. The formulated diets were isonitrogenous (45%) and isoenergetic (10 MJ kg−1). The inclusion of a full-fat insect meal did not affect the survival rate during the experimental period. The growth performance was significantly improved in the BL and TM treatments, while in the HI treatment was not affected. However, the GS treatment had a negative effect on the growth performance. The villus height decreased in the TM and GS treatment groups and increased in the BL diet group. The total number of bacteria increased in all insect meal diet groups. The results of the experiment show that B. lateralis, T. molitor and H. illucens full-fat meals can be used as a partial fish meal replacement without negative effects on survival or growth performance parameters. Moreover, full-fat insect meals may be considered as a protein source and a functional feed component that may positively affect the histomorphological structure of the fish gastrointestinal tract and stimulate the expansion of beneficial bacterial populations in the gut.

Functional unification of sex pheromone-receptive glomeruli in the invasive Turkestan cockroach derived from the genus Periplaneta

Female Periplaneta americana cockroaches emit two cooperatively working pheromone components, periplanone-B (PB) as a long-range attractant and periplanone-A (PA) as a short-range arrestant, and males develop enlarged glomeruli for processing them separately in the first-order olfactory center. Using intracellular recordings and neuronal labelings, we found that the Turkestan cockroach, Blatta lateralis, which is phylogenetically close to P. americana but having adapted to inground habitats, has an extraordinary large glomerulus. This is caused by drastic enlargement of the PB-responsive glomerulus but not the PA-responsive glomerulus during the late nymphal stage. The output neuron from the macroglomerulus is sensitive to both PA and PB, at a dose of only 0.1 fg. Nevertheless, B. lateralis males never exhibited courtship rituals in response to the presentation of periplanones or natural sex pheromone but exhibited courtship rituals in response to antennal contact with females. Our findings indicate that the unique behavioral ecology and habitats of B. lateralis are related to the functional unification of the pheromone processing system, opposite to the functional differentiation that often underlies species diversification.