Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations

Little is known about the causes of mortality in natural populations of threatened cactus species. In particular we focus on the endangered Astrophytum asterias in four populations where most individuals of the species are found. At two sites one of each vegetation type (Tamaulipan Thornscrub [MET]...

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Main Authors:	Martínez-Ávalos, José G., Golubov, Jordan, C. Mandujano, María, Jurado, Enrique
Format:	Online
Language:	eng
Published:	Universidad Autónoma de Tamaulipas 2008
Online Access:	https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/411
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spelling	oai:ojs.pkp.sfu.ca:article-4112017-11-17T19:03:44Z Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations Causas de mortalidad individual del “falso peyote” Astrophytum asterias (cactaceae); una cactácea amenazada: el efecto de daño de herbivoría en poblaciones mexicanas Martínez-Ávalos, José G. Golubov, Jordan C. Mandujano, María Jurado, Enrique cactaceae mortalidad Phytophtora infestans hongo patógeno Spermophilus mexicanus cerambycidae. cactaceae mortalidad Phytophtora infestans hongo patógeno Spermophilus mexicanus. Little is known about the causes of mortality in natural populations of threatened cactus species. In particular we focus on the endangered Astrophytum asterias in four populations where most individuals of the species are found. At two sites one of each vegetation type (Tamaulipan Thornscrub [MET] and Piedmont thornscrub [MS]) we measured individual mortality by three causes: the plant pathogen Phytophtora infestans, a cerambicideae beetle and the terrestrial squirrel Spermophilus mexicanus. We found that damage by the combination of pathogen and herbivore meant a reduction of more than 50% in population size. From these factors, the most important cause of death was S. mexicanus followed by the tenebrionid beetle in MET and P. infestans in MS. Mortality was concentrated in the small size categories, even though large size plants were also affected albeit to a lesser extent. More quantitative studies in field conditions are necessary to establish sound conservation efforts that could improve the recovery plans for this endangered plant species. El conocimiento sobre las causas de mortalidad en poblaciones naturales de cactáceas en peligro de extinción no está documentado. En particular en este estudio nos enfocamos en cuatro poblaciones de Astrophytum asterias en donde se encuentra el mayor número de individuos de esta especie. En dos tipos de vegetación en donde se encuentra A. asterias (matorral espinoso tamaulipeco [MET] y matorral submontano [MS]) medimos la mortalidad individual por tres causas: el fitopatógeno Phytophtora infestans, un cerambícido sp. y la ardilla terrestre Spermophilus mexicanus. Encontramos que el daño causado por la combinación de patógeno y herbívoro generó la reducción del 50% del tamaño de la población. De estos factores, la causa más importante fue mortalidad por S. mexicanus seguido del cerambícido en MET y P. infestans en MS. La mortalidad se concentró en los individuos de tamaño pequeño, aunque los individuos de tamaños grandes también fueron afectados. Se necesitan más estudios cuantitativos en condiciones naturales para establecer las causas de mortalidad y apuntalar los esfuerzos de conservación para mejorar los planes de manejo de esta especie amenazada. Universidad Autónoma de Tamaulipas 2008-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/411 CienciaUAT; Vol. 3 No. 1: July-September 2008; 70-74 CienciaUAT; Vol. 3 No. 1: Julio-Septiembre 2008; 70-74 2007-7858 2007-7521 eng https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/411/221
institution	CIENCIA UAT
collection	OJS
language	eng
format	Online
author	Martínez-Ávalos, José G. Golubov, Jordan C. Mandujano, María Jurado, Enrique
spellingShingle	Martínez-Ávalos, José G. Golubov, Jordan C. Mandujano, María Jurado, Enrique Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations
author_facet	Martínez-Ávalos, José G. Golubov, Jordan C. Mandujano, María Jurado, Enrique
author_sort	Martínez-Ávalos, José G.
title	Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations
title_short	Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations
title_full	Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations
title_fullStr	Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations
title_full_unstemmed	Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations
title_sort	causes of individual mortality of “false peyote” astrophytum asterias (cactaceae); a threatened cactaceae: the effect of damage by grazing in mexican populations
description	Little is known about the causes of mortality in natural populations of threatened cactus species. In particular we focus on the endangered Astrophytum asterias in four populations where most individuals of the species are found. At two sites one of each vegetation type (Tamaulipan Thornscrub [MET] and Piedmont thornscrub [MS]) we measured individual mortality by three causes: the plant pathogen Phytophtora infestans, a cerambicideae beetle and the terrestrial squirrel Spermophilus mexicanus. We found that damage by the combination of pathogen and herbivore meant a reduction of more than 50% in population size. From these factors, the most important cause of death was S. mexicanus followed by the tenebrionid beetle in MET and P. infestans in MS. Mortality was concentrated in the small size categories, even though large size plants were also affected albeit to a lesser extent. More quantitative studies in field conditions are necessary to establish sound conservation efforts that could improve the recovery plans for this endangered plant species.
publisher	Universidad Autónoma de Tamaulipas
publishDate	2008
url	https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/411
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Causes of individual mortality of “false peyote” Astrophytum asterias (cactaceae); a threatened Cactaceae: the effect of damage by grazing in Mexican populations

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