Fear of spiders! Arachnophobia
https://en.m.wikipedia.org/wiki/Arachnophobia
Our planet is under stress! Humans are consuming the resources way too fast. Infact they are sucking it dry! It has to stop somewhere.We have to let it repair itself. The day is not far where it will be too late and we will be standing and blaming one another for our own doom. This blog will show you the beauty and the dark side of this planet. Our palnet is our home. SAVE IT! SAVE YOURSELF!
Showing posts with label spider web. Show all posts
Showing posts with label spider web. Show all posts
Wednesday, 2 December 2015
How do spiders hunt?
How do spiders hunt?
http://www.amnh.org/explore/news-blogs/on-exhibit-posts/how-do-spiders-hunt
Spider web
Here, There, Everywhere
Spiders are endemic to every continent except Antarctica. Some species are terrestrial, that is they live on the ground, while others are arboreal, meaning they live in trees. Beyond this distinction, they've also displayed a penchant for living in far-flung climates and habitats, from tropical forests to ice-cold caves. Some specialist species live in a combination of extreme conditions. Case in point, the Kauai cave spider, who lives in lava-tube habitats in Hawaii. While some spiders are social, most are solitary and interact with each other only to fight or mate.
The Good
Spiders eat lots of insects, mostly those smaller than themselves. Taken as a whole and given the diversity of species assemblages in most ecosystems, spiders' primary niche in nearly every ecosystem is controlling insect populations. Some families, like orb weavers, do this through passive hunting with their signature webs. Others, like wolf spiders, do this through active hunting. Because many species overwinter, they can help reduce prey numbers early in the agricultural season, giving farmers, horticulturalists and gardeners a leg up on the season, according to Colorado State University. Spiders also kill other arachnids and spiders -- even those of the same species -- which helps keep their own numbers in check. Furthermore, spiders are an important food source for a variety of birds, lizards, wasps, and, especially in deserts, mammals.
Specifically Nondescript
Most spider species are generalists and have long generation times in comparison to prey, ergo there are no natural control species of spiders per se, according to the University of Michigan. This means introducing a given type of spider to an area -- or removing it -- can have little to no effect on most ecosystems. Indeed, studies synthesized and summarized by University of Maine researchers in 2003 show multiple spider species are more effective at reducing insect populations than single species. As such, it's hard to pinpoint a precise niche for a precise spider. They're no go, for instance, in stopping the singular, explosive outbreak of a single pest species. Still, spiders are far from superfluous to a given ecosystem when considered as a whole. If anything, new, different spider species are important for the simple fact that they're different from those already there.
Considering People
Spiders introduced to humans in natural or artificial ecosystems, integrated or not, likewise have good and bad impacts. On the positive side, chemicals harvested from spider venom help control and treat several diseases. Likewise, spider silk, which has proved to be the strongest natural material, has inspired mechanical engineering to new heights. On the negative side, spider are blamed for numerous bites, some of which have been deadly. All spiders have venom, but, in fact, most of the dangerous ones shy away from people. Moreover, their bites aren't deadly to healthy adults; they're just painful and really uncomfortable.
Courtesy www.animal. mom.me
Subscribe to:
Posts (Atom)