نتایج جستجو برای: arthropods

تعداد نتایج: 7453  

2017
Shavonn R. Whiten Heather Eggleston Zach N. Adelman

Heme and iron are essential molecules for many physiological processes and yet have the ability to cause oxidative damage such as lipid peroxidation, protein degradation, and ultimately cell death if not controlled. Blood-sucking arthropods have evolved diverse methods to protect themselves against iron/heme-related damage, as the act of bloodfeeding itself is high risk, high reward process. Pr...

2012
Maria Fátima Gonçalves José Alberto Pereira

Arthropods are part of important functional groups in soil food webs. Recognizing these arthropods and understanding their function in the ecosystem as well as when they are active is essential to understanding their roles. In the present work, the abundance and diversity of soil arthropods is examined in olive groves in the northeast region of Portugal during the spring. Five classes of arthro...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Kailen A Mooney Daniel S Gruner Nicholas A Barber Sunshine A Van Bael Stacy M Philpott Russell Greenberg

Theory on trophic interactions predicts that predators increase plant biomass by feeding on herbivores, an indirect interaction called a trophic cascade. Theory also predicts that predators feeding on predators, or intraguild predation, will weaken trophic cascades. Although past syntheses have confirmed cascading effects of terrestrial arthropod predators, we lack a comprehensive analysis for ...

Journal: :Ecological Indicators 2022

Temperate grasslands are part of one the biggest biomes on earth, sustaining high levels biodiversity and providing multiple ecosystem services. However, area covered by this open is decreasing worldwide, due to several threats like land use change or climate change. Ground-dwelling arthropods an important group community grassland soil invertebrates, they play a key role within ecosystem, whil...

2015
Ci-Xiu Li Mang Shi Jun-Hua Tian Xian-Dan Lin Yan-Jun Kang Liang-Jun Chen Xin-Cheng Qin Jianguo Xu Edward C Holmes Yong-Zhen Zhang

Although arthropods are important viral vectors, the biodiversity of arthropod viruses, as well as the role that arthropods have played in viral origins and evolution, is unclear. Through RNA sequencing of 70 arthropod species we discovered 112 novel viruses that appear to be ancestral to much of the documented genetic diversity of negative-sense RNA viruses, a number of which are also present ...

2015
Emerson Cristi de Barros Hudson Vaner Ventura Pablo Costa Gontijo Renata Ramos Pereira Marcelo Coutinho Picanço

Arthropods are an important group of macroorganisms that work to maintain ecosystem health. Despite the agricultural benefits of chemical control against arthropod pests, insecticides can cause environmental damage. We examined the effects of one and two applications of the insecticides chlorfenapyr (0.18 liters a.i. ha-1) and methamidophos (0.45 liters a.i. ha-1), both independently and in com...

Journal: :Polar Biology 2022

Biological invasions are a major threat to the terrestrial ecosystems of sub-Antarctic islands. While non-native plants generally have negative impacts on native arthropods, few studies investigated how both and arthropods interact in This was aim our study, which conducted three islands Kerguelen archipelago. The design based spatial proximity areas dominated by or plant species. Trait-based i...

Journal: :Communicative & integrative biology 2009
Alistair P McGregor Matthias Pechmann Evelyn E Schwager Wim Gm Damen

A number of recent studies have investigated posterior development in several different arthropods. As previously found in spiders, it has been discovered that Delta-Notch signaling is required for the development of posterior segments in an insect, the cockroach Periplaneta americana. Furthermore analysis of Wnt8 function in the spider Achaearanea tepidariorum and the beetle Tribolium castaneu...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2014
Andrea R Litt Erin E Cord Timothy E Fulbright Greta L Schuster

Non-native plants have invaded nearly all ecosystems and represent a major component of global ecological change. Plant invasions frequently change the composition and structure of vegetation communities, which can alter animal communities and ecosystem processes. We reviewed 87 articles published in the peer-reviewed literature to evaluate responses of arthropod communities and functional grou...

Journal: :The Journal of parasitology 1994
S D Snyder J Janovy

Second intermediate host-specificity was examined for 2 species of the frog lung fluke genus Haematolechus. Nine species of freshwater arthropods were exposed to cercariae of H. complexus and H. medioplexus. Metacercariae of H. complexus developed in all arthropod species used. Metacercariae of H. medioplexus developed only in anisopteran odonate naiads. This difference in host utilization may ...

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