国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁(yè)> 外文學(xué)位 >Movement and population dynamics of two ladybeetle (Coleoptera: Coccinellidae) species in agricultural crops.
【24h】

Movement and population dynamics of two ladybeetle (Coleoptera: Coccinellidae) species in agricultural crops.

機(jī)譯:兩種瓢蟲(鞘翅目:球蟲)在農(nóng)作物中的運(yùn)動(dòng)和種群動(dòng)態(tài)。

獲取原文
獲取原文并翻譯 | 示例

摘要

Scientists have debated the relative advantages of specialist and generalist biological control agents. The two species of ladybeetle that I study, Coccinella septempunctata L. and Harmonia axyridis Pallas, potentially show attributes of both---they are specialists on specific prey when that prey is common, but have the capacity to act as generalists when their focal prey is rare. Demonstrating that individual insects shift between prey species (e.g., act as generalists) requires one to develop a means of inferring insect movement. Chapter 1 of this thesis develops one such technique, utilizing stable carbon isotopes, and examines its overall utility. Chapter 2 uses this technique to examine how H. axyridis and C. septempunctata use different crops, and finds evidence that H. axyridis moves between crops, consistent with the patterns of adult abundance I observed in the field (e.g., there is evidence that H. axyridis acts as a generalist). Chapter 3 examines the associations between each ladybeetle species and a different aphid species (e.g., how each species acts as a specialist). As a whole, the thesis finds evidence of each ladybeetle species acting as a specialist on a different species of aphid, but also finds evidence of one ladybeetle, H. axyridis, acting as a generalist when densities of its focal prey, soybean aphids, are low. While there is circumstantial evidence (presented elsewhere) that suggests that C. septempunctata may also have the potential to behave as a generalist, the thesis as a whole suggests that there are differences between C. septempunctata and H. axyridis in this regard, notably in the likelihood of each species to consume aphids from C4-photosynthetic crops.
機(jī)譯:科學(xué)家們爭(zhēng)論了??坪蛯?粕锓乐蝿┑南鄬?duì)優(yōu)勢(shì)。我研究的兩種瓢蟲(Coccinella septempunctata L.和Harmonia axyridis Pallas)可能顯示出兩者的屬性-當(dāng)該獵物常見(jiàn)時(shí),它們是特定獵物的專家,但是當(dāng)它們的焦點(diǎn)獵物時(shí),它們可以充當(dāng)通才。很少見(jiàn)。要證明單個(gè)昆蟲在獵物物種之間轉(zhuǎn)移(例如充當(dāng)通才),就需要一種推論昆蟲活動(dòng)的手段。本文的第一章開發(fā)了一種利用穩(wěn)定碳同位素的技術(shù),并檢驗(yàn)了其整體用途。第2章使用該技術(shù)檢查了軸心線蟲和七葉線蟲如何使用不同的農(nóng)作物,并發(fā)現(xiàn)了軸心線蟲在不同作物之間移動(dòng)的證據(jù),這與我在田間觀察到的成年豐度模式是一致的(例如,有證據(jù)表明H 。axyridis擔(dān)任通才)。第3章研究了每種瓢蟲物種與不同的蚜蟲物種之間的關(guān)聯(lián)性(例如,每種物種如何充當(dāng)專家)??傮w而言,本文找到了每個(gè)瓢蟲物種在不同蚜蟲物種上的專長(zhǎng)的證據(jù),但是還發(fā)現(xiàn)了一個(gè)瓢蟲H. axyridis在其焦點(diǎn)獵物大豆蚜蟲密度高時(shí)充當(dāng)通才的證據(jù)。低。盡管有間接證據(jù)表明(其他地方有報(bào)道)S。septempunctata也可能具有多面手的行為,但從總體上看,本文認(rèn)為C. septempunctata和H. axyridis之間存在差異,特別是在每個(gè)物種消耗C4光合作物蚜蟲的可能性。

著錄項(xiàng)

  • 作者

    Forbes, Katherine Janet.;

  • 作者單位

    The University of Wisconsin - Madison.;

  • 授予單位 The University of Wisconsin - Madison.;
  • 學(xué)科 Biology Entomology.;Biology Zoology.
  • 學(xué)位 Ph.D.
  • 年度 2008
  • 頁(yè)碼 159 p.
  • 總頁(yè)數(shù) 159
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
  • 關(guān)鍵詞

相似文獻(xiàn)

  • 外文文獻(xiàn)
  • 中文文獻(xiàn)
  • 專利
獲取原文

客服郵箱:kefu@zhangqiaokeyan.com

京公網(wǎng)安備:11010802029741號(hào) ICP備案號(hào):京ICP備15016152號(hào)-6 六維聯(lián)合信息科技 (北京) 有限公司?版權(quán)所有
  • 客服微信

  • 服務(wù)號(hào)