Another well-characterized circadian reproductive behavior is oviposition (egg-laying rhythms; for review, see Howlader and Sharma, 2006). Conversely, apo-somatic (warning) coloration can reduce the risk of predation and allow greater freedom of movement, but the energy expenditure of movement and cost of biochemical sequestration must be considered. 1993) or to volatile chemicals released by plants in response to herbivory (Turlings et al. Explain. Explain. 3.11). Having A Limited Diet. The caterpillar has powerful jaws to cut through leaves. In evolutionary biology, convergent evolution is the process whereby organisms, not closely related, independently evolve similar traits as a result of having to adapt to similar environments or ecological niches. Crypsis (camouflage) reduces the risk of predation for day-feeders, but the cost of movement (in terms of attraction of predators) is substantial and limits ability to search for the most suitable food. Strikingly, the waggle dance performed by forager honeybees to indicate the location of food to other foragers is also time-compensated to correct for changes in the solar azimuth (Lindauer, 1954). These adaptations structure ecosystems and limit our capacity to use biological control agents to manage specialized agricultural pests. Willey (1985) noted that range grasshopper nymphs hatch from eggs daily about 5 to 8 h after the start of the light cycle, so daily collection is timed accordingly. Another well-studied insect circadian behavior is feeding (Abraham and Muraleedharan, 1990; Khan et al., 1997; Sothern et al., 1998; Das and Dimopoulos, 2008; Xu et al., 2008). The reason is that insects are masters of adaptations, meaning they have developed different features that help them survive. Three types of adaptations exist, structural, physiological and behavioral. Nielsen et al. Acacia seeds are so well adapted to the harsh climate of the Australian outback that a greater percentage of seeds will germinate only after exposure to extreme heat. Explain, When threatened, the caterpillar responds as shown in the video on the right. The ants get to eat the sugar in the capitulum
You've probably noticed that insects are everywhere, but did you ever wonder why there are so many insects in the world? Adaptations. Explain why. It's feeding is very methodical as shown on the right. Why are Acacia seeds vulnerable if they are left lying on the forest floor? The caterpillar looks like a bird dropping. In the face of hunger or starvation, insect responses can include changes in behavior and/or maintenance of a low metabolic rate through physiological adaptations or regulation. (1985) observed that European corn borer moths would oviposit only on smooth surfaces; and Hartley (1990) reported that polyester–cotton cloth used for oviposition by Heliothis spp. An example of this is when a lizard moves into the shade to avoid the heat of the Sun, or during a cold morning how it stands in direct sunlight to increase its body temperature. sourced from https://www.youtube.com/watch?v=uppwVyUd5S0. In cold weather, honey bees huddle together to retain heat. This balanced comprehensive account traces the alterations in body form undergone by insects as they adapt to seasonal change, exploring both theoretical aspects and practical issues, such as the impact of seasonality in insect pest management. These rhythmic biting activities have long been reported for various mosquitoes (see, for example, Haddow, 1956; Standfast, 1967), and were more recently proven to be controlled by circadian clocks (Pandian, 1994; Das and Dimopoulos, 2008). Drosophila eclosion occurs preferentially around dawn, and this eclosion rhythm is absent in classic clock gene mutants (Konopka and Benzer, 1971; Sehgal et al., 1994). Understanding the behavior of pest and beneficial insects could improve pest-management programs (Renou and Guerrero, 2000; Bendena, 2010). Behavior genetics began to develop as a field of study in the 1960s, but was limited to demonstrating that a behavioral trait was heritable, determining whether its mode of inheritance was dominant or recessive, sex-linked or autosomal, and resolving whether the variation was due to single or multiple genes. This increased resistance appears to be related to cuticular melanization, i.e., the formation of the pigment melanin by polymerization of phenolic compounds (Charnley, 1984; Jacobson, 2000). the stick insects that hatch in the nest and therefore wiping out the entire population of stick insects? Adaptations are the result of evolution and can occur when a gene mutates or changes by accident. Many questions still remain and many pest species are not well understood. Thus, behavior includes studies to understand how an insect takes in information from its environment, processes that information, and acts. Schultz (1983) developed a tradeoff surface to illustrate four foraging strategies for arboreal caterpillars (Fig. 3 Minute Read Look at the pupa. Seasonal adaptations in insects from the high arctic. or (2) physiological countermeasures that regulate the metabolism of related physiological and biochemical substances in the body to improve … pp. Having the complete genomes insects simplifies the isolation of specific genes involved in behavior. Behavioral adaptation is a way an animal acts or behaves in order to stay alive or get an advantage in reproduction due to its climate. Acacias produce dry fruit pods that contain seeds, shown on the right, that are well adapted to the harsh Australian conditions. animals will eat the seeds. Drosophila melanogaster, for example, shows two peaks of locomotor activity around dawn and dusk, which are frequently called morning and evening peaks, respectively (Figure 1). An adaptation is a special characteristic that enables a plant or animal to be successful in a particular environment . The ants vacate the nest after several months. Behavioral responses of insect herbivores to toxins are examined in managed and natural systems with reference to two important but largely ignored factors: heterogeneity in toxin distributions and the nature of the relationship between behavioral responses and physiological adaptation to the same toxins. For instance, egg hatching is gated by the circadian clock in many insects (see, for example, Minis and Pittendrigh, 1968; Lazzari, 1991; Sauman and Reppert, 1996). Did you ever have a fly land on your nose, get stung by a bee, or feel the squishy feeling after accidentally stepping on a caterpillar? Yong Zhang, Patrick Emery, in Insect Molecular Biology and Biochemistry, 2012. In a group, generate a list of as many animals and objects that can fly. The eggs of many species of stick insect
A fascinating response to fungal infections is the concept of behavioral fever (Roy et al., 2006), whereby infected insects (e.g., locusts, flies) modify their behavior (e.g., basking in the sun) to increase body temperature, with an adverse effect on the fungal entomopathogen present in the hemocoel (Carruthers et al., 1992; Kalsbeek et al., 2001; Elliot et al., 2002). Species that live in cold mountain streams (like mayfly naiads) or on the surface of ice and snow (like grylloblattids) are adapted for activity at low temperatures. Costs of feeding (i.e., metabolic costs of digestion, reduced growth, etc. In tropotactic behavior, insects move toward or away from a stimulus, such as light, humidity, or temperature. Figure 1. Timing of mating behavior might even contribute to reproductive isolation, since closely related Drosophila species prefer to mate at different times (Sakai and Ishida, 2001a, 2001b). (Think of hazards if the seed is left on the surface,
had to be replaced by a polyester-cotton cloth with a dimpled surface for oviposition by the beet armyworm, the velvetbean caterpillar, and the soybean looper, Pseudoplusia includens (Walker). Interestingly, in Drosophila the prothoracic gland shows rhythmic autonomous expressions of clock proteins (Emery et al., 1997). Analyses of insect behavior employ techniques from several disciplines including anatomy, biochemistry, ecology, ethology (study of animal behavior in the natural environment), genetics, psychology, physiology, and statistics (Matthews and Matthews, 1978; Hay, 1985; Bell, 1990; Via, 1990; Barton Browne, 1993; Heisenberg, 1997; Doerge, 2002). (B) Schematic representation of the expression pattern of two key circadian genes (per and tim) and their protein products. 1987, Schultz 1983, Stephens and Krebs 1986, Townsend and Hughes 1981). 1993). Related to feeding behavior, foraging behavior can also be circadianly controlled – for example, in honeybees and bumblebees (Moore et al., 1989; Bloch, 2010; Stelzer et al., 2010). This is evident in devising an ovipositional substrate and stimulus. I have emphasized the broader concepts that will help in understanding how stored-product insects perceive and interact with the world around them. In the absence of males the females lay eggs that will hatch into female stick insects. Feeding selectively on the most suitable food during the day incurs a moderate cost of movement (energy expenditure at higher temperature) and high risk of predation. Some non-social insects have been shown to exhibit density-dependent prophylaxis, i.e., increased resistance to pathogens when reared under high-density conditions (Wilson and Reeson, 1998). Light can also affect insect emergence. To warm up, reptiles and many insects find sunny places and adopt positions that maximise their exposure; at harmfully high temperatures they seek shade or cooler water. Similarly, Boller (1985) observed that the European cherry fruit fly and the Mediterranean fruit fly both emerge mostly during the morning and oviposit in the afternoon. Furthermore, recent studies indicate individuals have “personalities”; for example, some may be more adventurous than others. Giant long-legged katydid. In Drosophila melanogaster, male courtship is more frequent during the night and seems to drive rhythmic mating behavior (Fujii et al., 2007), although earlier studies indicate that the female circadian clock also affects mating rhythms (Sakai and Ishida, 2001a). bushfires will burn the seeds
make its eggs appealing to ants? One definition of behavior is any action that an individual carries out in response to a stimulus or its environment, especially an action that can be observed and described. Cremer et al. The genetic analysis of behavior rightfully has been perceived to be more complex than analysis of morphological or anatomical traits (Vanin et al., 2012). Locomotor activity is the most intensively studied circadian behavior in insects (see, for example, Konopka and Benzer, 1971; Saunders and Thomson, 1977; Kenny and Saunders, 1991; Page, 1982; Fleury et al., 1995; Cymborowski et al., 1996; Clark et al., 1997). Most other insects, however, slow down as the temperature falls. On the other hand, Guthrie et al. This book represents the basic understanding about insect behavior. Genetic analyses of insect behavior involve, in many cases, analyses of the physiological or morphological changes associated with the change in behavior. Seasonal Adaptations of Insects Maurice J. and Catherine A. Tauber and Sinzo Masaki. Another behavior that is modulated by the circadian clock in Drosophila is larval photophobicity (Mazzoni et al., 2005). Mating rhythms are also found in cockroaches and moths, for example (Silvegren et al., 2005; Rymer et al., 2007). Such adaptations can be of structural, physiological and behavioral nature. Molecular genetics may allow us to localize and identify some of the individual genes among the “many” involved in interesting and complex behaviors exhibited by insects (Doerge, 2002). The actogram is double-plotted: each day (except the first) is plotted twice, first on the right half of the actogram, and then on the left half on the next line. P-element-mediated transformation makes it possible to insert genes from one species of Drosophila into the genome of another to determine their effect(s). Spodoptera littoralis (Wilson et al., 2001) and Tenebrio molitor (Barnes and Siva-Jothy, 2010) have shown increased resistance to B. bassiana and M. anisopliae, respectively, when reared in crowded conditions. Such positive phototaxis is a common attribute of many insects and is similarly useful in their collection. As another example, mealworms (Tenebrio molitor: Coleoptera) show positive phototaxis in low or high relative humidity, and negative phototaxis in intermediate conditions. Metamorphosis is also frequently circadian. BEHAVIORAL ADAPTATIONS TO AQUATIC LIFE IN INSECTS 107 When oxygen pressure declines, aeshnicl larvae can replace normal ventilation by … Zeitgeber Time (ZT) 0 corresponds to the beginning of the light phase. James F. Campbell, in Insect Management for Food Storage and Processing (Second Edition), 2006. Papacek and Smith (1985) lighted a rearing room for oleander scale 2 h before work began so scale crawlers would accumulate on top of butternut pumpkins. What type of adaptation is this? Insects have several unique adaptations including the exoskeleton, their size, how they reproduce, their ability to fly, and metamorphosis. Why do you think the stick insect has evolved a way to
Thus it may be said that adaptations (physiological, behavioural and morphological adaptations) have played a leading role in insects to become the most dominant organisms on the earth’s surface. What type of adaptation is this shown on the time-lapse video on the right? Timothy D. Schowalter, in Insect Ecology (Second Edition), 2006. This plays an essential role in long-distance foraging and migratory behavior – for example, in bees (Lindauer, 1960; Bloch, 2010) and Monarch butterflies (Mouritsen and Frost, 2002; Froy et al., 2003; Reppert et al., 2010). In some cases the combining of behavioral characteristics may be disadvantageous. At the same time, insect predators must undergo certain adaptive changes to make finding and capturing prey less difficult. An adaptation is a change in a physical or behavioral characteristic that has developed to allow an animal to better survive in its environment. Most insects are adapted to either a lentic or a lotic habitat, but overlaps are common. Under homogeneous light conditions, adult mealworms moved toward the predicted direction of greater or lesser light that was indicated by the rotated magnetic field, whereas they oriented randomly in darkness. Interestingly, the production and release of, and response to, sex pheromones can be regulated by the circadian clock (Silvegren et al., 2005; Merlin et al., 2007; Krupp et al., 2008). Processing information in the central nervous system may involve integrating information over time, including stimuli such as hormones coming from within the insect. What type of adaptation is this and how is this a survival advantage? Chemical ovipositional stimuli may also be necessary. Interestingly, the neural substrate regulating oviposition rhythms in Drosophila melanogaster is distinct from those controlling circadian eclosion (see below) and adult locomotor rhythms (Howlader et al., 2006). For example, the positive phototaxis of scale crawlers makes them easily collected. Orientation toward cues indicating suitable resources improves the efficiency of food acquisition. In contrast, the increased resistance against M. acridum in S. gregaria reared in crowded conditions appears to be related to increased antimicrobial activity (Wilson et al., 2002). Behavior can be divided into several sequential steps: stimulus recognition, signal transduction, integration, and response or motor output. Selective feeding at night reduces predation risk but increases the energetic cost of movement under cooler temperatures, which then restricts the time spent feeding, especially at high latitudes. Passive or active behavioral changes in insects are reminiscent of evolutionary adaptations that either promote cross-kingdom control by fungi or altruistic behavior by the hosts. Stick insects display all three very well. When it come to the stick insects a good example is parthenogenesis. Most insects must search for suitable food at some spatial scale. Because the larvae drink readily, a light spray of distilled water and retention in the dark at 18°C reduce cannibalism. Sublethal doses of defensive chemicals reduce nutritional value of the resource, so they should be avoided when resources are abundant but they may be eaten when more profitable resources are unavailable or not apparent (Courtney 1985, 1986). Consider the life cycle of the butterfly, shown on the right. Continued search also increases exposure to predators or other mortality agents. We will discuss in detail the neural bases for these two peaks in section 15.4, and the molecular mechanisms underlying these rhythms in section 15.2. The seeds protect the ants form other ants invading the nest. - Features that make the insect look like a scorpion. They reach a dormant state, called torpor or quiescence, when they get very cold. Foraging can be optimized by searching for more nutritive food and risking attention of predators, accepting less nutritive food, or defending against predation. Look at the video on the right. Sometimes, however, behavior is changed in an insect because a morphological trait has been altered through mutation. What type of adaptation do these features represent? Certain adapted insect herbivores utilize plant toxins for self-defense against their own enemies. In Seasonal adaptation and diapause in insects. Edited by Takeda, M. and Tanaka, S.. Bun-ichi-Sogo Publishing, Ltd., Tokyo. We show that entomopathogenic nematodes that are exposed to the western corn rootworm, an important agricultural pest that sequesters defense metabolites … As an example of behavioral adaptation by agricultural insects, a recent study described species adaptation by the peach potato aphid (Myzus persicae) under agricultural selection pressures . The rainforest is exceedingly full of natural resources but the competition for … Circadian control of PTTH release, PTTH responsiveness, ecdysteroid synthesis, hemolymph ecdysteroid titer, and ecdysteroid receptor expression have been described in Rhodnius prolixus and other insects (Cymborowski et al., 1991; Vafopoulou and Steel, 1991, 1996; Pelc and Steel, 1997; Richter, 2001; for review, see Steel and Vafopoulou, 2006). Insect behavior covers a very wide range of activities, including locomotion, grooming, feeding, communication, reproduction, dispersal, flight, learning, migration, host or prey selection, diapause, and various responses to environmental hazards such as temperature, humidity, parasites, and toxins (Beck, 1980; Alcock, 1984; Tauber et al., 1986; Gatehouse, 1997; Bazzett, 2008; Ikeno et al., 2011). Accordingly, many predaceous species are attracted to mating pheromones of their prey (Stephen et al. Grisdale (1985a) reported that first-instar hemlock loopers are strongly photopositive and active, but also cannibalistic.