Water and culture reader

This style creates more thrust, but less lift than counter-stroking; synchronised-stroking, with forewings and hindwings beating together, is used when changing direction rapidly, as it maximises thrust; and gliding, with the wings held out, is used in three situations: For example, the blue-eyed darner Rhionaeschna multicolor lives all across North America, and in Central America; [8] emperors Anax live throughout the Americas from as far north as Newfoundland to as far south as Bahia Blanca in Argentina, [9] across Europe to central Asia, North Africa, and the Middle East.

If you notice any discrepancy, please let us know and we would gladly make the amendments. Unwanted mating is energetically costly for females because it affects the amount of time that they are able to spend foraging.

Sperm is produced at the 9th segment and is transferred to the secondary genitalia prior to mating. In other families such as clubtails Gomphidaecruisers Macromiidaeemeralds Corduliidaeand skimmers Libellulidaethe female lays eggs by tapping the surface of the water repeatedly with her abdomen, by shaking the eggs out of her abdomen as she flies along, or by placing the eggs on vegetation.

Some dragonflies, such as the green darner, Anax juniushave a noniridescent blue which is produced structurally by scatter from arrays of tiny spheres in the endoplasmic reticulum of epidermal cells underneath the cuticle.

Unwanted mating is energetically costly for females because it affects the amount of time that they are able to spend foraging. The prothorax is small and is flattened dorsally into a shield-like disc which has two transverse ridges. In any one area, individuals of a particular "spring species" emerge within a few days of each other.

The mating system of dragonflies is complex and they are among the few insect groups that have a system of indirect sperm transfer along with sperm storage, delayed fertilization, and sperm competition.

The male-bias ratio has contributed partially to the females using different habitats to avoid male harassment. The territory contains desirable features such as a sunlit stretch of shallow water, a special plant species, or a particular substrate necessary for egg-laying.

The naiads of some clubtails Gomphidae that burrow into the sediment, have a snorkel-like tube at the end of the abdomen enabling them to draw in clean water while they are buried in mud.

This list is compiled based on reader contributions and our own dining experiences. The abdomen is long and slender and consists of 10 segments and a terminal appendage-bearing segment. The springtime darner Basiaeschna janatafor example, is suddenly very common in the spring, but disappears a few weeks later and is not seen again until the following year.

Some aeshnids such as the brown hawker Aeshna grandis have translucent, pale yellow wings.

Water Trail Development

The springtime darner Basiaeschna janatafor example, is suddenly very common in the spring, but disappears a few weeks later and is not seen again until the following year. Each has two short basal joints, two long joints, and a three-jointed foot, armed with a pair of claws. A particular perch may give a dragonfly a good view over an insect-rich feeding ground, and the blue dasher Pachydiplax longipennis jostles other dragonflies to maintain the right to alight there.

451: Unavailable due to legal reasons

Emperor dragonflyAnax imperatornewly emerged and still soft, holding on to its dry exuviaand expanding its wings Parts of a dragonfly nymph including the labial "mask" The larval stage of dragonflies lasts up to five years in large species, and between two months and three years in smaller species.

Females may sometimes be harassed by males to the extent that it affects their normal activities including foraging and in some dimorphic species females have evolved multiple forms with some forms appearing deceptively like males.

The nymph extends its hinged labium a toothed mouthpart similar to a lower mandible, which is sometimes termed as a "mask" as it is normally folded and held before the face that can extend forward and retract rapidly to capture prey such as mosquito larvae, tadpolesand small fish.

Read this forum letter August 13, The Today newspaper published an article on the harmful impact of bottled water, primarily from the discarding of plastic bottles. When he is ready to mate, he transfers a packet of sperm from his primary genital opening on segment 9, near the end of his abdomen, to his secondary genitalia on segments 2—3, near the base of his abdomen.

Much of the article has been written from the perspective of these restaurants, along with several comments from the stakeholders.

The wings are long, veined, and membranous, narrower at the tip and wider at the base. Much of the article has been written from the perspective of these restaurants, along with several comments from the stakeholders. They are not native to Icelandbut individuals are occasionally swept in by strong winds, including a Hemianax ephippiger native to North Africa, and an unidentified darter species.

The common whitetail Plathemis lydia dashes towards an intruder holding its white abdomen aloft like a flag. Flight[ edit ] Red-veined darters Sympetrum fonscolombii flying "in cop" male ahead Dragonflies are powerful and agile fliers, capable of migrating across the sea, moving in any direction, and changing direction suddenly.

In other families such as clubtails Gomphidaecruisers Macromiidaeemeralds Corduliidaeand skimmers Libellulidaethe female lays eggs by tapping the surface of the water repeatedly with her abdomen, by shaking the eggs out of her abdomen as she flies along, or by placing the eggs on vegetation.

This labium is folded under the body at rest and struck out at great speed by hydraulic pressure created by the abdominal muscles.

The adult dragonfly crawls out of its larval skin, the exuviaarching backwards when all but the tip of its abdomen is free, to allow its exoskeleton to harden. Dragonflies having simple flap shed the eggs in water, mostly in flight.

Water Trail Development

Swarms of feeding adults aggregate to prey on swarming prey such as emerging flying ants or termites. Dragonflies suborder Anisoptera are heavy-bodied, strong-flying insects that hold their wings horizontally both in flight and at rest.

A particular perch may give a dragonfly a good view over an insect-rich feeding ground, and the blue dasher Pachydiplax longipennis jostles other dragonflies to maintain the right to alight there. For a long while we have noticed an annoying trend in many restaurants.

An increasing number have a no-water policy: They do not serve free water to diners even when requested. Instead, we have to buy their bottled water.

Water Trail Development

Not only is the bottled water overpriced, the bottles are eco-unfriendly as well. We find this practice highly unacceptable. Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.

Reader's Theater Scripts and Plays. Readers Theater is a dramatic presentation of a written work in a script form. Readers read from a "script" and reading parts are divided among the readers.

The water and culture reader

Chemicals, contaminants, pollution, price: new reasons to rethink what you drink and beware of bottled water. A dragonfly is an insect belonging to the order Odonata, infraorder Anisoptera (from Greek ἄνισος anisos, "unequal" and πτερόν pteron, "wing", because the hindwing is broader than the forewing).Adult dragonflies are characterized by large, multifaceted eyes, two pairs of strong, transparent wings, sometimes with coloured patches, and an elongated body.

Chemicals, contaminants, pollution, price: new reasons to rethink what you drink and beware of bottled water.

Water and culture reader
Rated 5/5 based on 52 review
Dragonfly - Wikipedia