Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China
<p>Abstract</p> <p>Background</p> <p>The most recent strategy for schistosomiasis control in the People's Republic of China aims to reduce the likelihood of environmental contamination of schistosome eggs. Despite considerable progress, it is believed that achievem...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2011-07-01
|
| Series: | Parasites & Vectors |
| Online Access: | http://www.parasitesandvectors.com/content/4/1/133 |
| _version_ | 1818020811902025728 |
|---|---|
| author | Qiu Dong-Chuan Zhong Bo Wu Feng Sun Le-Ping Zhou Xiao-Nong Yang Guo-Jing Utzinger Jürg Bradshaw Corey JA |
| author_facet | Qiu Dong-Chuan Zhong Bo Wu Feng Sun Le-Ping Zhou Xiao-Nong Yang Guo-Jing Utzinger Jürg Bradshaw Corey JA |
| author_sort | Qiu Dong-Chuan |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>The most recent strategy for schistosomiasis control in the People's Republic of China aims to reduce the likelihood of environmental contamination of schistosome eggs. Despite considerable progress, it is believed that achievements would be further consolidated with additional intermediate host snail control measures. We provide an empirical framework for discerning the relative contribution of intrinsic effects (density feedback) from other extrinsic drivers of snail population dynamics.</p> <p>Methods</p> <p>We set up experiments in two study locations to collect reproduction data of <it>Oncomelania hupensis</it>, the intermediate host snail of <it>Schistosoma japonicum</it>. We applied a set of four population dynamic models that have been widely used to study phenomenological time-series data to examine the properties of demographic density feedback patterns from abundance data. We also contrasted the obtained results with the component feedback of density on survival rate to determine whether adult survival was the principal driver of the demographic feedback observed.</p> <p>Results</p> <p>Demographic density feedback models (Ricker- and Gompertz-logistic) accounted for > 99% of Akaike's information criterion model weight, with the Gompertz ranking highest in all <it>O. hupensis </it>population groups. We found some evidence for stronger compensatory feedback in the <it>O. hupensis </it>population from Sichuan compared to a Jiangsu population. Survival rates revealed strong component feedback, but the log-linear relationships (i.e. Gompertz) had less support in the demographic feedback analysis.</p> <p>Conclusions</p> <p>Our findings indicate that integrated schistosomiasis control measures must continue to reduce parasite abundance further because intermediate host snail populations tend to grow exponentially at low densities, especially <it>O. hupensis </it>populations in mountainous regions. We conclude that density feedback in adult survival is the principal component contribution to the demographic phenomenon observed in the population fitness (<it>r</it>)-abundance relationship.</p> |
| first_indexed | 2024-04-14T08:10:26Z |
| format | Article |
| id | doaj.art-e3c5f0ffcd2647bea0ee75556551f0a3 |
| institution | Directory Open Access Journal |
| issn | 1756-3305 |
| language | English |
| last_indexed | 2024-04-14T08:10:26Z |
| publishDate | 2011-07-01 |
| publisher | BMC |
| record_format | Article |
| series | Parasites & Vectors |
| spelling | doaj.art-e3c5f0ffcd2647bea0ee75556551f0a32022-12-22T02:04:34ZengBMCParasites & Vectors1756-33052011-07-014113310.1186/1756-3305-4-133Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in ChinaQiu Dong-ChuanZhong BoWu FengSun Le-PingZhou Xiao-NongYang Guo-JingUtzinger JürgBradshaw Corey JA<p>Abstract</p> <p>Background</p> <p>The most recent strategy for schistosomiasis control in the People's Republic of China aims to reduce the likelihood of environmental contamination of schistosome eggs. Despite considerable progress, it is believed that achievements would be further consolidated with additional intermediate host snail control measures. We provide an empirical framework for discerning the relative contribution of intrinsic effects (density feedback) from other extrinsic drivers of snail population dynamics.</p> <p>Methods</p> <p>We set up experiments in two study locations to collect reproduction data of <it>Oncomelania hupensis</it>, the intermediate host snail of <it>Schistosoma japonicum</it>. We applied a set of four population dynamic models that have been widely used to study phenomenological time-series data to examine the properties of demographic density feedback patterns from abundance data. We also contrasted the obtained results with the component feedback of density on survival rate to determine whether adult survival was the principal driver of the demographic feedback observed.</p> <p>Results</p> <p>Demographic density feedback models (Ricker- and Gompertz-logistic) accounted for > 99% of Akaike's information criterion model weight, with the Gompertz ranking highest in all <it>O. hupensis </it>population groups. We found some evidence for stronger compensatory feedback in the <it>O. hupensis </it>population from Sichuan compared to a Jiangsu population. Survival rates revealed strong component feedback, but the log-linear relationships (i.e. Gompertz) had less support in the demographic feedback analysis.</p> <p>Conclusions</p> <p>Our findings indicate that integrated schistosomiasis control measures must continue to reduce parasite abundance further because intermediate host snail populations tend to grow exponentially at low densities, especially <it>O. hupensis </it>populations in mountainous regions. We conclude that density feedback in adult survival is the principal component contribution to the demographic phenomenon observed in the population fitness (<it>r</it>)-abundance relationship.</p>http://www.parasitesandvectors.com/content/4/1/133 |
| spellingShingle | Qiu Dong-Chuan Zhong Bo Wu Feng Sun Le-Ping Zhou Xiao-Nong Yang Guo-Jing Utzinger Jürg Bradshaw Corey JA Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China Parasites & Vectors |
| title | Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China |
| title_full | Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China |
| title_fullStr | Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China |
| title_full_unstemmed | Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China |
| title_short | Compensatory density feedback of <it>Oncomelania hupensis </it>populations in two different environmental settings in China |
| title_sort | compensatory density feedback of it oncomelania hupensis it populations in two different environmental settings in china |
| url | http://www.parasitesandvectors.com/content/4/1/133 |
| work_keys_str_mv | AT qiudongchuan compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT zhongbo compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT wufeng compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT sunleping compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT zhouxiaonong compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT yangguojing compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT utzingerjurg compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina AT bradshawcoreyja compensatorydensityfeedbackofitoncomelaniahupensisitpopulationsintwodifferentenvironmentalsettingsinchina |