Mapping the habitat suitability of Ottelia species in Africa

doi:10.1016/j.pld.2021.12.006

Plant Diversity ›› 2022, Vol. 44 ›› Issue (05): 468-480.DOI: 10.1016/j.pld.2021.12.006

• Research paper • Previous Articles Next Articles

Mapping the habitat suitability of Ottelia species in Africa

Boniface K. Ngarega^a,b,c,d, John M. Nzei^a,b,c, Josphat K. Saina^a,b,c,d, Marwa Waseem A. Halmy^e, Jin-Ming Chen^a,b, Zhi-Zhong Li^a,b

a. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China;
b. Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan, 430074, China;
c. University of Chinese Academy of Sciences, Beijing, 100049, China;
d. Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, 666303, China;
e. Department of Environmental Sciences, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt

Received:2021-05-08 Revised:2021-12-28 Online:2022-10-14 Published:2022-09-25
Supported by:
We are grateful to John M.Ndung'u for early consultations on this study's statistical approach.In addition,we would like to thank Drs.Valerie F.Masocha (Xishuangbanna Tropical Botanical Garden) and Yeshitila Mekbib (Ethiopian Biodiversity Institute) for thought-provoking discussions regarding the study.Thanks are also due to the Kasanka trust for providing logistics during our fieldwork in Zambia.We acknowledge the Department of National Parks and Wildlife,Zambia,for the competent authority of permits during our fieldwork in Zambia.We thank the anonymous reviewers for their suggestions and comments on an earlier draft of our manuscript.This research was fundedfunded by the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB 31000000),the National Natural Science Foundation of China (Nos.32070253 and 32100186),and the Sino-Africa Joint Research Center (No.SAJC201322).

Mapping the habitat suitability of Ottelia species in Africa

Boniface K. Ngarega^a,b,c,d, John M. Nzei^a,b,c, Josphat K. Saina^a,b,c,d, Marwa Waseem A. Halmy^e, Jin-Ming Chen^a,b, Zhi-Zhong Li^a,b

a. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China;
b. Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan, 430074, China;
c. University of Chinese Academy of Sciences, Beijing, 100049, China;
d. Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, 666303, China;
e. Department of Environmental Sciences, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt

通讯作者: Zhi-Zhong Li,E-mail:lizhizhong@wbgcas.cn
基金资助:
We are grateful to John M.Ndung'u for early consultations on this study's statistical approach.In addition,we would like to thank Drs.Valerie F.Masocha (Xishuangbanna Tropical Botanical Garden) and Yeshitila Mekbib (Ethiopian Biodiversity Institute) for thought-provoking discussions regarding the study.Thanks are also due to the Kasanka trust for providing logistics during our fieldwork in Zambia.We acknowledge the Department of National Parks and Wildlife,Zambia,for the competent authority of permits during our fieldwork in Zambia.We thank the anonymous reviewers for their suggestions and comments on an earlier draft of our manuscript.This research was fundedfunded by the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB 31000000),the National Natural Science Foundation of China (Nos.32070253 and 32100186),and the Sino-Africa Joint Research Center (No.SAJC201322).

Abstract

Abstract: Understanding the influence of environmental covariates on plant distribution is critical, especially for aquatic plant species. Climate change is likely to alter the distribution of aquatic species. However, knowledge of this change on the burden of aquatic macroorganisms is often fraught with difficulty. Ottelia, a model genus for studying the evolution of the aquatic family Hydrocharitaceae, is mainly distributed in slow-flowing creeks, rivers, or lakes throughout pantropical regions in the world. Due to recent rapid climate changes, natural Ottelia populations have declined significantly. By modeling the effects of climate change on the distribution of Ottelia species and assessing the degree of niche similarity, we sought to identify high suitability regions and help formulate conservation strategies. The models use known background points to determine how environmental covariates vary spatially and produce continental maps of the distribution of the Ottelia species in Africa. Additionally, we estimated the possible influences of the optimistic and extreme pessimistic representative concentration pathways scenarios RCP 4.5 and RCP 8.5 for the 2050s. Our results show that the distinct distribution patterns of studied Ottelia species were influenced by topography (elevation) and climate (e.g., mean temperature of driest quarter, annual precipitation, and precipitation of the driest month). While there is a lack of accord in defining the limiting factors for the distribution of Ottelia species, it is clear that water-temperature conditions have promising effects when kept within optimal ranges. We also note that climate change will impact Ottelia by accelerating fragmentation and habitat loss. The assessment of niche overlap revealed that Ottelia cylindrica and O. verdickii had slightly more similar niches than the other Ottelia species. The present findings identify the need to enhance conservation efforts to safeguard natural Ottelia populations and provide a theoretical basis for the distribution of various Ottelia species in Africa.

Key words: African freshwater bodies, Climate change, Ecological niche modeling, Habitat suitability, Niche overlap

摘要： Understanding the influence of environmental covariates on plant distribution is critical, especially for aquatic plant species. Climate change is likely to alter the distribution of aquatic species. However, knowledge of this change on the burden of aquatic macroorganisms is often fraught with difficulty. Ottelia, a model genus for studying the evolution of the aquatic family Hydrocharitaceae, is mainly distributed in slow-flowing creeks, rivers, or lakes throughout pantropical regions in the world. Due to recent rapid climate changes, natural Ottelia populations have declined significantly. By modeling the effects of climate change on the distribution of Ottelia species and assessing the degree of niche similarity, we sought to identify high suitability regions and help formulate conservation strategies. The models use known background points to determine how environmental covariates vary spatially and produce continental maps of the distribution of the Ottelia species in Africa. Additionally, we estimated the possible influences of the optimistic and extreme pessimistic representative concentration pathways scenarios RCP 4.5 and RCP 8.5 for the 2050s. Our results show that the distinct distribution patterns of studied Ottelia species were influenced by topography (elevation) and climate (e.g., mean temperature of driest quarter, annual precipitation, and precipitation of the driest month). While there is a lack of accord in defining the limiting factors for the distribution of Ottelia species, it is clear that water-temperature conditions have promising effects when kept within optimal ranges. We also note that climate change will impact Ottelia by accelerating fragmentation and habitat loss. The assessment of niche overlap revealed that Ottelia cylindrica and O. verdickii had slightly more similar niches than the other Ottelia species. The present findings identify the need to enhance conservation efforts to safeguard natural Ottelia populations and provide a theoretical basis for the distribution of various Ottelia species in Africa.

关键词: African freshwater bodies, Climate change, Ecological niche modeling, Habitat suitability, Niche overlap

Boniface K. Ngarega, John M. Nzei, Josphat K. Saina, Marwa Waseem A. Halmy, Jin-Ming Chen, Zhi-Zhong Li. Mapping the habitat suitability of Ottelia species in Africa[J]. Plant Diversity, 2022, 44(05): 468-480.

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Mapping the habitat suitability of Ottelia species in Africa

Mapping the habitat suitability of Ottelia species in Africa

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