Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)

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Delphacodes kuscheli establish mutualistic relationship with yeast-like symbionts (YLS) that live in the fat body and are necessary for host survival and reproduction. We estimated for a host of age t, its body weight, W(t), and the number of YLS per host, YLS(t). The host body weight was calculated...

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Autores principales: Liljesthröm, Gerardo Gustavo, Brentassi, María Eugenia, Marino de Remes Lenicov, Ana María
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Biología
Argentina
Maize
Yeast-like symbionts
Planthoppers
Delphacodes kuscheli
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128570
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128570
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Argentina
Maize
Yeast-like symbionts
Planthoppers
Delphacodes kuscheli
spellingShingle Biología
Argentina
Maize
Yeast-like symbionts
Planthoppers
Delphacodes kuscheli
Liljesthröm, Gerardo Gustavo
Brentassi, María Eugenia
Marino de Remes Lenicov, Ana María
Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)
topic_facet Biología
Argentina
Maize
Yeast-like symbionts
Planthoppers
Delphacodes kuscheli
description Delphacodes kuscheli establish mutualistic relationship with yeast-like symbionts (YLS) that live in the fat body and are necessary for host survival and reproduction. We estimated for a host of age t, its body weight, W(t), and the number of YLS per host, YLS(t). The host body weight was calculated as: W(t) = Lm/[1+ e (d–kt)], (Lm = the maximum observed weight, and d and k are constants), and the fat body was considered a fixed proportion of W(t). We calculated the number of YLS per unit host body mass: α(t) = YLS(t)/W(t). We also calculated the number of YLS per host, cYLS(t), and analyzed the pattern of variation in both sexes adapting the expression of the logistic model: cYLS(t) = KNoert/K+(ert -1)No, (No = initial number of YLS, r = intrinsic per capita rate of natural increase, and K = variable carrying capacity). In females the carrying capacity varied according to a constant proportion of the host’s weight: K(t) = αW(t). In males α(t) was considered a decreasing function of the host age: K(t) = α(t)W(t). The coefficients No, α, and r were subjected to parameterization. We found that the patterns of W(t) and YLS(t) of D. kuscheli were similar to other planthoppers. In females YLS increased up to the adult stage and then remained almost constant, varying similarly to individual weight. In males YLS increased up to the 5th instar nymph as the individual weight did, but the number of YLS decreased in the adult stage and the correlation was not so good. The calculated number of YLS per host matches reasonably well with the number estimated experimentally both in females and males. This is the first study that quantified and modeled the dynamics of YLS endosymbionts in a Neotropical planthopper pest. The models will be used in future studies for better understand the experimental reduction of YLS in young nymphal stages.
format Articulo
Articulo
author Liljesthröm, Gerardo Gustavo
Brentassi, María Eugenia
Marino de Remes Lenicov, Ana María
author_facet Liljesthröm, Gerardo Gustavo
Brentassi, María Eugenia
Marino de Remes Lenicov, Ana María
author_sort Liljesthröm, Gerardo Gustavo
title Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)
title_short Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)
title_full Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)
title_fullStr Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)
title_full_unstemmed Modeling population dynamics of yeast-like symbionts (Ascomycota: Pyrenomycetes: Clavicipitaceae) of the planthopper Delphacodes kuscheli (Hemiptera: Delphacidae)
title_sort modeling population dynamics of yeast-like symbionts (ascomycota: pyrenomycetes: clavicipitaceae) of the planthopper delphacodes kuscheli (hemiptera: delphacidae)
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/128570
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