Eylem Seç
Ecology of Shade Coffee in Puerto Rico
Başlık:
Ecology of Shade Coffee in Puerto Rico
Yazar:
Lopez, Victor J. Vega, author.
ISBN:
9780438030558
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (115 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Paul Bayman; Jess K. Zimmerman Committee members: James D. Ackerman; Deborah J. Lodge; Eugenio Santiago.
Özet:
In this dissertation I explore in the ecology of shade coffee in farms located in the Central mountain Range of Puerto Rico. First, I seek to evaluate the effect of contrasting environments in composition and features of culturable fungal endophyte communities, using leaves from sun and shade-grown coffee plants. The communities were characterized by a low isolation rate and a high percentage of singletons. There was a core of abundant morphospecies, mostly Colletotrichum. The community structure was similar between habitats and shared the most abundant morphospecies. No significant differences in richness were found, but evenness was a significant higher in shade. Results suggest that shade enhances the diversity of the fungal endophyte communities in coffee leaves by reducing dominance. Second, I seek to establish whether the coffee berry borer (CBB) is an obstacle to the grow shade coffee in Puerto Rico. I sampled 134 sites in sun and shade agroecosystems. A Generalized Linear Mixed Models showed significant higher infestation in shade coffee, but not show significant differences in population between agroecosystems. Significant differences in infestation disappear when data were evaluated a finer scale. Spearman correlation show that infestation was positively associated with altitude in both agroecosystmes. There was a negative relationship between temperature and infestation and population in sun sites but not in shade. These results suggest that sustainable production of coffee is possible in the island. Third, I seek to answer the question, can the CBB use hosts other than coffee for food and shelter in Puerto Rico? Fruits that showed perforations from potential alternate host plants were collected and examined for the presence of beetles from subfamily Scolytinae. From 857 beetles identified morphologically 17 were Hypothenemus hampei, most of which were found in Inga vera during coffee fruits scarcity period. Not use of alternative sources of food was observed. The results show that in Puerto Rico it is rare to find CBB in fruits of alternate hosts. The scarcity of coffee fruits in the off-season might trigger some H. hampeiindividuals to take refuge in fruits of other plants on coffee farms, even though they do not feed or reproduce within them.
Notlar:
School code: 0281
Tüzel Kişi Ek Girişi:
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(682797.1) | 682797-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
On Order
Liste seç
Bunu varsayılan liste yap.
Öğeler başarıyla eklendi
Öğeler eklenirken hata oldu. Lütfen tekrar deneyiniz.
:
Select An Item
Data usage warning: You will receive one text message for each title you selected.
Standard text messaging rates apply.