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Huang M, Chen Y, Zhou W, Wei F. Assessing the response of marine fish communities to climate change and fishing. Conserv Biol 2024:e14291. [PMID: 38745485 DOI: 10.1111/cobi.14291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 02/21/2024] [Accepted: 02/28/2024] [Indexed: 05/16/2024]
Abstract
Globally, marine fish communities are being altered by climate change and human disturbances. We examined data on global marine fish communities to assess changes in community-weighted mean temperature affinity (i.e., mean temperatures within geographic ranges), maximum length, and trophic levels, which, respectively, represent the physiological, morphological, and trophic characteristics of marine fish communities. Then, we explored the influence of climate change and fishing on these characteristics because of their long-term role in shaping fish communities, especially their interactive effects. We employed spatial linear mixed models to investigate their impacts on community-weighted mean trait values and on abundance of different fish lengths and trophic groups. Globally, we observed an initial increasing trend in the temperature affinity of marine fish communities, whereas the weighted mean length and trophic levels of fish communities showed a declining trend. However, these shift trends were not significant, likely due to the large variation in midlatitude communities. Fishing pressure increased fish communities' temperature affinity in regions experiencing climate warming. Furthermore, climate warming was associated with an increase in weighted mean length and trophic levels of fish communities. Low climate baseline temperature appeared to mitigate the effect of climate warming on temperature affinity and trophic levels. The effect of climate warming on the relative abundance of different trophic classes and size classes both exhibited a nonlinear pattern. The small and relatively large fish species may benefit from climate warming, whereas the medium and largest size groups may be disadvantaged. Our results highlight the urgency of establishing stepping-stone marine protected areas to facilitate the migration of fishes to habitats in a warming ocean. Moreover, reducing human disturbance is crucial to mitigate rapid tropicalization, particularly in vulnerable temperate regions.
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Affiliation(s)
- Mingpan Huang
- Center for Evolution and Conservation Biology, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Yiting Chen
- Center for Evolution and Conservation Biology, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
- Department of Ocean Science, Hong Kong University of Science and Technology, Hong Kong, China
| | - Wenliang Zhou
- Center for Evolution and Conservation Biology, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
| | - Fuwen Wei
- Center for Evolution and Conservation Biology, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Jiangxi Key Laboratory of Conservation Biology, College of Forestry, Jiangxi Agricultural University, Nanchang, China
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Wang Z, Chase JM, Xu W, Liu J, Wu D, Zhang A, Wang J, Luo Y, Yu M. Higher trophic levels and species with poorer dispersal traits are more susceptible to habitat loss on island fragments. Ecology 2024:e4300. [PMID: 38650396 DOI: 10.1002/ecy.4300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 12/07/2023] [Accepted: 01/22/2024] [Indexed: 04/25/2024]
Abstract
Ongoing habitat loss and fragmentation caused by human activities represent one of the greatest causes of biodiversity loss. However, the effects of habitat loss and fragmentation are not felt equally among species. Here, we examined how habitat loss influenced the diversity and abundance of species from different trophic levels, with different traits, by taking advantage of an inadvertent experiment that created habitat islands from a once continuous forest via the creation of the Thousand Island Lake, a large reservoir in China. On 28 of these islands with more than a 9000-fold difference in their area (0.12-1154 ha), we sampled plants, herbivorous insects, and predatory insects using effort-controlled sampling and analyses. This allowed us to discern whether any observed differences in species diversity were due to passive sampling alone or to demographic effects that disproportionately influenced some species relative to others. We found that while most metrics of sampling effort-controlled diversity increased with island area, the strength of the effect was exacerbated for species in higher trophic levels. When we more explicitly examined differences in species composition among islands, we found that the pairwise difference in species composition among islands was dominated by species turnover but that nestedness increased with differences in island area, indicating that some species are more likely to be absent from smaller islands. Furthermore, by examining trends of several dispersal-related traits of species, we found that species with lower dispersal propensity tended to be those that were lost from smaller islands, which was observed for herbivorous and predatory insects. Our results emphasize the importance of incorporating within-patch demographic effects, as well as the taxa and traits of species when understanding the influence of habitat loss on biodiversity.
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Affiliation(s)
- Zhonghan Wang
- MOE Key Laboratory of Biosystems Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Jonathan M Chase
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Department of Computer Science, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Wubing Xu
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Department of Computer Science, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Jinliang Liu
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Donghao Wu
- MOE Key Laboratory of Biosystems Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- School of Ecology, Sun Yat-sen University, Guangzhou, China
| | - Aiying Zhang
- MOE Key Laboratory of Biosystems Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- College of Life Sciences, China Jiliang University, Zhejiang, China
| | - Jirui Wang
- School of Agricultural and Food Science, Zhejiang Agriculture and Forestry University, Zhejiang, China
| | - Yuanyuan Luo
- College of Life Sciences, China Jiliang University, Zhejiang, China
| | - Mingjian Yu
- MOE Key Laboratory of Biosystems Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
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Yang X, Deng Y, Qin J, Luo K, Kang B, He X, Yan Y. Dietary Shifts in the Adaptation to Changing Marine Resources: Insights from a Decadal Study on Greater Lizardfish ( Saurida tumbil) in the Beibu Gulf, South China Sea. Animals (Basel) 2024; 14:798. [PMID: 38473183 DOI: 10.3390/ani14050798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 02/24/2024] [Accepted: 02/29/2024] [Indexed: 03/14/2024] Open
Abstract
Understanding dietary behavior during the individual development of marine predators and its temporal variations elucidates how species adapt to changes in marine resources. This is crucial for predicting marine predators' habitat selection and the natural population's responses to environmental changes. The authors conducted a comparative analysis of dietary shift strategies and trophic level variations in Greater lizardfish (Saurida tumbil) in the Beibu Gulf during two distinct periods (2010 and 2020) using stomach content and stable isotope analysis methods. Possible driving factors for these changes were also explored. Changes in the fishery community structure and the decline in the abundance of primary prey resources have led the S. tumbil population to diversify their prey species, utilize alternative resources, and expand their foraging space. However, the species' foraging strategy, characterized by chasing and preying on schooling and pelagic prey, promoted stability in their feeding behavior across spatial and temporal scales. The main prey items remained demersal and pelagic fish species, followed by cephalopods and crustaceans. Similar to other generalist fish species, ontogenetic dietary shifts (ODSs) indicated a partial transition towards larger prey items. However, the timing and magnitude of the ODSs varied between the two periods, reflecting life-history variations and adaptive adjustments to environmental changes. In comparison to 2010, the population's mean body length (BL) increased in 2020, and the proportion of the population feeding on pelagic-neritic prey significantly increased. However, the δ15N values were lower, indicating that the shift in the ecological niche of preferred prey from demersal to pelagic-neritic was the primary cause of the decrease in trophic levels. In the future, we will conduct further quantitative research integrating the spatiotemporal data of both predators and prey to clarify the relationships between marine predators' feeding behavior, trophic levels, and changes in prey community structure.
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Affiliation(s)
- Xiaodong Yang
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China
| | - Yujian Deng
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China
| | - Jiao Qin
- Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang 524000, China
| | - Konglan Luo
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China
| | - Bin Kang
- Fisheries College, Ocean University of China, Qingdao 266003, China
| | - Xiongbo He
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China
- Guangdong Provincial Engineering and Technology Research Center of Far Sea Fisheries Management and Fishing of South China Sea, Guangdong Ocean University, Zhanjiang 524088, China
| | - Yunrong Yan
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China
- Guangdong Provincial Engineering and Technology Research Center of Far Sea Fisheries Management and Fishing of South China Sea, Guangdong Ocean University, Zhanjiang 524088, China
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Adkins J, Hammill E, Abdulwahab UA, Draper JP, Wolf JM, McClure CM, González Ortiz AA, Chavez EA, Atwood TB. Environmental variables drive spatial patterns of trophic diversity in mammals. Ecol Lett 2023; 26:1940-1950. [PMID: 37694760 DOI: 10.1111/ele.14306] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 08/23/2023] [Accepted: 08/29/2023] [Indexed: 09/12/2023]
Abstract
Understanding environmental drivers of species diversity has become increasingly important under climate change. Different trophic groups (predators, omnivores and herbivores) interact with their environments in fundamentally different ways and may therefore be influenced by different environmental drivers. Using random forest models, we identified drivers of terrestrial mammals' total and proportional species richness within trophic groups at a global scale. Precipitation seasonality was the most important predictor of richness for all trophic groups. Richness peaked at intermediate precipitation seasonality, indicating that moderate levels of environmental heterogeneity promote mammal richness. Gross primary production (GPP) was the most important correlate of the relative contribution of each trophic group to total species richness. The strong relationship with GPP demonstrates that basal-level resource availability influences how diversity is structured among trophic groups. Our findings suggest that environmental characteristics that influence resource temporal variability and abundance are important predictors of terrestrial mammal richness at a global scale.
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Affiliation(s)
- Jaron Adkins
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - Edd Hammill
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - Umarfarooq A Abdulwahab
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - John P Draper
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - J Marshall Wolf
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - Catherine M McClure
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - Adrián A González Ortiz
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - Emily A Chavez
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
| | - Trisha B Atwood
- The Department of Watershed Sciences and The Ecology Center, Utah State University, Logan, Utah, USA
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Du XY, Zhang PF, Gong SR, Liang YS, Huang YH, Li HS, Pang H. Discovery of a novel circulation route of free-living Serratiasymbiotica mediated by predatory ladybird beetles. FEMS Microbiol Ecol 2023; 99:fiad133. [PMID: 37852673 DOI: 10.1093/femsec/fiad133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/06/2023] [Accepted: 10/17/2023] [Indexed: 10/20/2023] Open
Abstract
Horizontal transmission of bacteria to varied hosts can maintain and even expand microbial niches. We previously found that the aphid gut bacterium Serratia symbiotica strain SsMj can be transmitted to ladybird beetles via predation, but whether the predator is a new host, a reservoir or a dead end of this bacterium is unknown. This study aims to provide a clear picture of SsMj circulation from aphids to plants and predators. We first found that SsMj in aphids and ladybirds was abundantly distributed not only in digestive tracts but also in droppings. We found no evidence for vertical transmission of SsMj to aphid offspring. Instead, we showed that it could be transmitted to conspecific aphids by sharing the same plant or contacting honeydews. The key finding of this study is that SsMj was transmitted from aphids to ladybirds through predation, while ladybirds could also transfer SsMj back to aphids, possibly through feces. Together, this evidence suggests that SsMj is able to survive in the digestive tracts and droppings of insects and to expand its host range with plants and predators as reservoirs.
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Affiliation(s)
- Xue-Yong Du
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
| | - Pei-Fang Zhang
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
| | - Sen-Rui Gong
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
| | - Yuan-Sen Liang
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
| | - Yu-Hao Huang
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
| | - Hao-Sen Li
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
| | - Hong Pang
- State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China
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Cagnolo L, Bernaschini L, Salvo A, Valladares G. Habitat area and edges affect the length of trophic chains in a fragmented forest. J Anim Ecol 2023; 92:2067-2077. [PMID: 37649437 DOI: 10.1111/1365-2656.13998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 08/02/2023] [Indexed: 09/01/2023]
Abstract
The food chain length represents how much energy reaches different trophic levels in food webs. Environmental changes derived from human activities have the potential to affect chain length. We explore how habitat area and edges affect chain length through: (1) a bottom-up effect of abundance ('pyramid hypothesis'); (2) the truncation of the highest trophic level ('trophic-rank hypothesis'); and (3) changes in species connectivity patterns ('connectivity hypothesis'). We built plant-leaf miner-parasitoid food webs in 19 remnants of a fragmented Chaco forest from central Argentina. On each remnant, we constructed food webs from different locations at the forest interior and edges. For each food web, we registered the abundance of species, the species richness of each trophic level, estimated the connectivity of their networks, and the average food chain length. We used structural equation models to evaluate the direct and indirect effects of habitat area and edge/interior location on food chain length mediated by species richness, abundance and connectivity. We found no direct effects of habitat area on chain length but chains were longer at forest edges than at their interior. The three mechanisms were supported by our results, although they showed different strengths. First, we found that the interior favours a bottom-up abundance effect from herbivores to parasitoids that positively affected chain length; second, we found that the forest area positively affects plant richness, which has a strong effect on the number of resources used by consumers, with a positive effect on chain length. Third, the remnant area and interior position favoured plant richness with a negative effect on the abundance of parasitoids, which had a positive effect on chain length. In general, the strongest effects on chain length were detected through changes in abundance rather than species richness although abundance was less affected by habitat fragmentation. We evaluated for the first time the effects of human-driven habitat fragmentation on the length of trophic chains in highly diverse plant-herbivore-parasitoid networks. Despite the loss of species, small habitat fragments and edges embedded in the agricultural matrix can support interaction networks, making them conservation targets in managed landscapes.
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Affiliation(s)
- Luciano Cagnolo
- Instituto Multidisciplinario de Biologı́a Vegetal, Universidad Nacional de Córdoba, Consejo Nacional de Investigaciones Cientı́ficas y Técnicas, Córdoba, Argentina
| | - Laura Bernaschini
- Instituto Multidisciplinario de Biologı́a Vegetal, Universidad Nacional de Córdoba, Consejo Nacional de Investigaciones Cientı́ficas y Técnicas, Córdoba, Argentina
| | - Adriana Salvo
- Instituto Multidisciplinario de Biologı́a Vegetal, Universidad Nacional de Córdoba, Consejo Nacional de Investigaciones Cientı́ficas y Técnicas, Córdoba, Argentina
| | - Graciela Valladares
- Instituto Multidisciplinario de Biologı́a Vegetal, Universidad Nacional de Córdoba, Consejo Nacional de Investigaciones Cientı́ficas y Técnicas, Córdoba, Argentina
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Gamon JA. Revisiting the carbon-biodiversity connection. Glob Chang Biol 2023; 29:5117-5119. [PMID: 37334465 DOI: 10.1111/gcb.16829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 06/01/2023] [Indexed: 06/20/2023]
Abstract
Ecosystem studies often consider the co-benefits of biodiversity and carbon sequestration, but these carbon-biodiversity links can be complex and multifaceted. Recent findings in forest ecosystems emphasize the importance of looking beyond single trophic levels and the more visible, above-ground portions to consider the full range of relationships between all ecosystem components when evaluating carbon sequestration potential. Simple engineered solutions to carbon storage based on monocultures that fail to consider all costs and benefits may be deceiving and lead to inappropriate management practices. Regenerating natural ecosystems may best enhance the co-benefits of carbon sequestration and biodiversity.
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Affiliation(s)
- John A Gamon
- School of Natural Resources, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
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Schuldt A, Liu X, Buscot F, Bruelheide H, Erfmeier A, He JS, Klein AM, Ma K, Scherer-Lorenzen M, Schmid B, Scholten T, Tang Z, Trogisch S, Wirth C, Wubet T, Staab M. Carbon-biodiversity relationships in a highly diverse subtropical forest. Glob Chang Biol 2023; 29:5321-5333. [PMID: 36970888 DOI: 10.1111/gcb.16697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 03/14/2023] [Indexed: 06/18/2023]
Abstract
Carbon-focused climate mitigation strategies are becoming increasingly important in forests. However, with ongoing biodiversity declines we require better knowledge of how much such strategies account for biodiversity. We particularly lack information across multiple trophic levels and on established forests, where the interplay between carbon stocks, stand age, and tree diversity might influence carbon-biodiversity relationships. Using a large dataset (>4600 heterotrophic species of 23 taxonomic groups) from secondary, subtropical forests, we tested how multitrophic diversity and diversity within trophic groups relate to aboveground, belowground, and total carbon stocks at different levels of tree species richness and stand age. Our study revealed that aboveground carbon, the key component of climate-based management, was largely unrelated to multitrophic diversity. By contrast, total carbon stocks-that is, including belowground carbon-emerged as a significant predictor of multitrophic diversity. Relationships were nonlinear and strongest for lower trophic levels, but nonsignificant for higher trophic level diversity. Tree species richness and stand age moderated these relationships, suggesting long-term regeneration of forests may be particularly effective in reconciling carbon and biodiversity targets. Our findings highlight that biodiversity benefits of climate-oriented management need to be evaluated carefully, and only maximizing aboveground carbon may fail to account for biodiversity conservation requirements.
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Affiliation(s)
- Andreas Schuldt
- Forest Nature Conservation, University of Göttingen, 37077, Göttingen, Germany
| | - Xiaojuan Liu
- State Key Laboratory of Vegetation and Environmental Change, Chinese Academy of Sciences, Institute of Botany, 100093, Beijing, China
| | - François Buscot
- Department of Soil Ecology, UFZ-Helmholtz Centre for Environmental Research, 06120, Halle (Saale), Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
| | - Helge Bruelheide
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, 06108, Halle (Saale), Germany
| | | | - Jin-Sheng He
- Institute of Ecology, College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes, Peking University, Beijing, 100871, China
| | - Alexandra-Maria Klein
- Nature Conservation and Landscape Ecology, University of Freiburg, 79106, Freiburg, Germany
| | - Keping Ma
- State Key Laboratory of Vegetation and Environmental Change, Chinese Academy of Sciences, Institute of Botany, 100093, Beijing, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
| | | | - Bernhard Schmid
- Department of Geography, Remote Sensing Laboratories, University of Zurich, 8057, Zurich, Switzerland
| | - Thomas Scholten
- Department of Geosciences, Soil Science and Geomorphology, University of Tübingen, 72070, Tübingen, Germany
| | - Zhiyao Tang
- Institute of Ecology, College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes, Peking University, Beijing, 100871, China
| | - Stefan Trogisch
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, 06108, Halle (Saale), Germany
| | - Christian Wirth
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
- Systematic Botany and Functional Biodiversity, University of Leipzig, 04103, Leipzig, Germany
| | - Tesfaye Wubet
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, 06120, Halle (Saale), Germany
| | - Michael Staab
- Ecological Networks, Technical University Darmstadt, 64287, Darmstadt, Germany
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Tomanović Ž, Kavallieratos NG, Ye Z, Nika EP, Petrović A, Vollhardt IMG, Vorburger C. Cereal Aphid Parasitoids in Europe (Hymenoptera: Braconidae: Aphidiinae): Taxonomy, Biodiversity, and Ecology. Insects 2022; 13:1142. [PMID: 36555052 PMCID: PMC9785021 DOI: 10.3390/insects13121142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/02/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Cereals are very common and widespread crops in Europe. Aphids are a diverse group of herbivorous pests on cereals and one of the most important limiting factors of cereal production. Here, we present an overview of knowledge about the taxonomy, biodiversity, and ecology of cereal aphid parasitoids in Europe, an important group of natural enemies contributing to cereal aphid control. We review the knowledge obtained from the integrative taxonomy of 26 cereal aphid primary parasitoid species, including two allochthonous species (Lysiphlebus testaceipes and Trioxys sunnysidensis) and two recently described species (Lipolexis labialis and Paralipsis brachycaudi). We further review 28 hyperparasitoid species belonging to three hymenopteran superfamilies and four families (Ceraphronoidea: Megaspillidae; Chalcidoidea: Pteromalidae, Encyrtidae; Cynipoidea: Figitidae). We also compile knowledge on the presence of secondary endosymbionts in cereal aphids, as these are expected to influence the community composition and biocontrol efficiency of cereal aphid parasitoids. To study aphid-parasitoid-hyperparasitoid food webs more effectively, we present two kinds of DNA-based approach: (i) diagnostic PCR (mainly multiplex PCR), and (ii) DNA sequence-based methods. Finally, we also review the effects of landscape complexity on the different trophic levels in the food webs of cereal aphids and their associated parasitoids, as well as the impacts of agricultural practices and environmental variation.
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Affiliation(s)
- Željko Tomanović
- Faculty of Biology, Institute of Zoology, University of Belgrade, 16 Studentski trg, 11000 Belgrade, Serbia
- Serbian Academy of Sciences and Arts, Knez Mihailova 35, 11000 Belgrade, Serbia
| | - Nickolas G. Kavallieratos
- Laboratory of Agricultural Zoology and Entomology, Department of Crop Science, Agricultural University of Athens, 75 Iera Odos Str., 11855 Athens, Greece
| | - Zhengpei Ye
- Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Xueyuan Road 4, Haikou 571101, China
| | - Erifili P. Nika
- Laboratory of Agricultural Zoology and Entomology, Department of Crop Science, Agricultural University of Athens, 75 Iera Odos Str., 11855 Athens, Greece
| | - Andjeljko Petrović
- Faculty of Biology, Institute of Zoology, University of Belgrade, 16 Studentski trg, 11000 Belgrade, Serbia
| | - Ines M. G. Vollhardt
- Agroecology, Department of Crop Science, Georg-August University Göttingen, Grisebachstrasse 6, 37077 Göttingen, Germany
| | - Christoph Vorburger
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland
- Institute of Integrative Biology, Department of Environmental Systems Science, ETH Zürich, 8092 Zürich, Switzerland
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Feller AF, Seehausen O. Genetic architecture of adaptive radiation across two trophic levels. Proc Biol Sci 2022; 289:20220377. [PMID: 35506225 PMCID: PMC9065965 DOI: 10.1098/rspb.2022.0377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Evolution of trophic diversity is a hallmark of adaptive radiation. Yet, transitions between carnivory and herbivory are rare in young adaptive radiations. Haplochromine cichlid fish of the African Great Lakes are exceptional in this regard. Lake Victoria was colonized by an insectivorous generalist and in less than 20 000 years, several clades of specialized herbivores evolved. Carnivorous versus herbivorous lifestyles in cichlids require many different adaptations in functional morphology, physiology and behaviour. Ecological transitions in either direction thus require many traits to change in a concerted fashion, which could be facilitated if genomic regions underlying these traits were physically linked or pleiotropic. However, linkage/pleiotropy could also constrain evolvability. To investigate components of the genetic architecture of a suite of traits that distinguish invertivores from algae scrapers, we performed quantitative trait locus (QTL) mapping using a second-generation hybrid cross. While we found indications of linkage/pleiotropy within trait complexes, QTLs for distinct traits were distributed across several unlinked genomic regions. Thus, a mixture of independently segregating variation and some pleiotropy may underpin the rapid trophic transitions. We argue that the emergence and maintenance of associations between the different genomic regions underpinning co-adapted traits that evolved and persist against some gene flow required reproductive isolation.
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Affiliation(s)
- Anna F. Feller
- Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, 3012 Bern, Switzerland,Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry (CEEB), Eawag Swiss Federal Institute of Aquatic Science and Technology, Seestrasse 79, 6047 Kastanienbaum, Switzerland
| | - Ole Seehausen
- Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, 3012 Bern, Switzerland,Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry (CEEB), Eawag Swiss Federal Institute of Aquatic Science and Technology, Seestrasse 79, 6047 Kastanienbaum, Switzerland
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11
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Engel E, Lau D, Godoy WAC, Pasini MPB, Malaquias JB, Santos CDR, Pivato J, Pereira PRVDS. Oscillation, synchrony, and multi-factor patterns between cereal aphids and parasitoid populations in southern Brazil. Bull Entomol Res 2022; 112:143-150. [PMID: 34486961 DOI: 10.1017/s0007485321000729] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In different parts of the world, aphid populations and their natural enemies are influenced by landscapes and climate. In the Neotropical region, few long-term studies have been conducted, maintaining a gap for comprehension of the effect of meteorological variables on aphid population patterns and their parasitoids in field conditions. This study describes the general patterns of oscillation in cereal winged aphids and their parasitoids, selecting meteorological variables and evaluating their effects on these insects. Aphids exhibit two annual peaks, one in summer-fall transition and the other in winter-spring transition. For parasitoids, the highest annual peak takes place during winter and a second peak occurs in winter-spring transition. Temperature was the principal meteorological regulator of population fluctuation in winged aphids and parasitoids during the year. The favorable temperature range is not the same for aphids and parasitoids. For aphids, temperature increase resulted in population growth, with maximum positive effect at 25°C. Temperature also positively influenced parasitoid populations, but the growth was asymptotic around 20°C. Although rainfall showed no regulatory function on aphid seasonality, it influenced the final number of insects over the year. The response of aphids and parasitoids to temperature has implications for trophic compatibility and regulation of their populations. Such functions should be taken into account in predictive models.
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Affiliation(s)
- Eduardo Engel
- Department of Entomology and Acarology, Laboratory of Ecology and Forest Entomology, University of São Paulo, ESALQ, Piracicaba, São Paulo, Brazil
| | - Douglas Lau
- Brazilian Agricultural Research Corporation (Embrapa Trigo), Passo Fundo, Rio Grande do Sul, Brazil
| | - Wesley A C Godoy
- Department of Entomology and Acarology, Laboratory of Ecology and Forest Entomology, University of São Paulo, ESALQ, Piracicaba, São Paulo, Brazil
| | - Mauricio P B Pasini
- Laboratory of Entomology, University of Cruz Alta-Unicruz, Cruz Alta, Rio Grande do Sul, Brazil
| | - José B Malaquias
- Department of Biostatistics, Institute of Biosciences - IBB, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Carlos D R Santos
- Faculty of Agronomy, Postgraduate Program in Plant Science, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brasil
| | - Juliana Pivato
- Faculty of Agronomy, Postgraduate Program in Plant Science, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brasil
| | - Paulo R V da S Pereira
- Brazilian Agricultural Research Corporation (Embrapa Florestas), Colombo, Paraná, Brazil
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12
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Jensen JK, Jayousi S, von Post M, Isaksson C, Persson AS. Contrasting effects of tree origin and urbanization on invertebrate abundance and tree phenology. Ecol Appl 2022; 32:e2491. [PMID: 34757670 DOI: 10.1002/eap.2491] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 04/28/2021] [Accepted: 06/04/2021] [Indexed: 06/13/2023]
Abstract
The ongoing wide-scale introduction of nonnative plants across the world may negatively influence native invertebrate fauna, due to a lack of coevolved traits related to the novel plants, e.g., unique phytochemicals or shifted phenology. Nonnative plants, specifically trees, are common in urban environments, areas that already pose novel habitats to plants and wildlife through a wide array of anthropogenic factors. For example, impervious surfaces contribute to increased ambient temperatures, the so-called urban heat island effect (UHI), which can affect local plant phenology. Yet, few studies have simultaneously studied the effects of urbanization and tree species origin on urban invertebrate communities. We measured the city-level UHI and phenology of nine native and seven nonnative tree species in five city-center parks in southern Sweden, as well as four common native species in a rural control forest. We quantified the abundance of invertebrates on a subset of native and nonnative tree species through shake sampling, sticky traps, and frass collection. In the urban environment, nonnative trees hosted significantly fewer invertebrates compared to native trees. Furthermore, the nonnative trees had a delayed phenology compared to native species, while the peak of caterpillars associated with the subset of trees surveyed for this measure was significantly earlier compared to that of the native species studied. The effect of tree species origin on urban invertebrate abundance was of a greater magnitude (effect size) than the effect of urbanization on invertebrate abundance in native tree hosts. Hence, the results indicate that the impact of nonnative vegetation may be a stronger driver of invertebrate declines in urban areas than other factors. As the effect of species origin on tree phenology was at a level comparable to the urban effect, increasing prevalence of nonnative vegetation can potentially obscure effects of urbanization on phenology in large-scale studies, as well as induce mismatches to invertebrate populations. Since parks harbor a large proportion of urban biodiversity, native trees play a crucial role in such habitats and should not be considered replaceable by nonnative species in terms of conservation value.
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Affiliation(s)
- Johan Kjellberg Jensen
- Department of Biology, Lund University, Sölvegatan 37, Lund, 223 62, Sweden
- Centre for Environmental and Climate Science (CEC), Lund University, Sölvegatan 37, Lund, 223 62, Sweden
| | - Sherin Jayousi
- Department of Biology, Lund University, Sölvegatan 37, Lund, 223 62, Sweden
| | - Maria von Post
- Department of Biology, Lund University, Sölvegatan 37, Lund, 223 62, Sweden
| | - Caroline Isaksson
- Department of Biology, Lund University, Sölvegatan 37, Lund, 223 62, Sweden
| | - Anna S Persson
- Centre for Environmental and Climate Science (CEC), Lund University, Sölvegatan 37, Lund, 223 62, Sweden
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13
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Wu NC, Rubin AM, Seebacher F. Endocrine disruption from plastic pollution and warming interact to increase the energetic cost of growth in a fish. Proc Biol Sci 2022; 289:20212077. [PMID: 35078359 PMCID: PMC8790379 DOI: 10.1098/rspb.2021.2077] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Energetic cost of growth determines how much food-derived energy is needed to produce a given amount of new biomass and thereby influences energy transduction between trophic levels. Growth and development are regulated by hormones and are therefore sensitive to changes in temperature and environmental endocrine disruption. Here, we show that the endocrine disruptor bisphenol A (BPA) at an environmentally relevant concentration (10 µgl-1) decreased fish (Danio rerio) size at 30°C water temperature. Under the same conditions, it significantly increased metabolic rates and the energetic cost of growth across development. By contrast, BPA decreased the cost of growth at cooler temperatures (24°C). BPA-mediated changes in cost of growth were not associated with mitochondrial efficiency (P/O ratios (i.e. adenosine diphosphate (ADP) used/oxygen consumed) and respiratory control ratios) although BPA did increase mitochondrial proton leak. In females, BPA decreased age at maturity at 24°C but increased it at 30°C, and it decreased the gonadosomatic index suggesting reduced investment into reproduction. Our data reveal a potentially serious emerging problem: increasing water temperatures resulting from climate warming together with endocrine disruption from plastic pollution can impact animal growth efficiency, and hence the dynamics and resilience of animal populations and the services these provide.
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Affiliation(s)
- Nicholas C. Wu
- School of Life and Environmental Sciences A08, The University of Sydney, Sydney, NSW 2006, Australia
| | - Alexander M. Rubin
- School of Life and Environmental Sciences A08, The University of Sydney, Sydney, NSW 2006, Australia
| | - Frank Seebacher
- School of Life and Environmental Sciences A08, The University of Sydney, Sydney, NSW 2006, Australia
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14
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Ammar Y, Niiranen S, Otto SA, Möllmann C, Finsinger W, Blenckner T. The rise of novelty in marine ecosystems: The Baltic Sea case. Glob Chang Biol 2021; 27:1485-1499. [PMID: 33438266 PMCID: PMC7985865 DOI: 10.1111/gcb.15503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/29/2020] [Accepted: 12/11/2020] [Indexed: 06/12/2023]
Abstract
Global environmental changes have accelerated at an unprecedented rate in recent decades due to human activities. As a consequence, the incidence of novel abiotic conditions and biotic communities, which have been continuously emerging in the Earth system, has rapidly risen. Despite growing attention to the incidence and challenges posed by novelty in terrestrial ecosystems, novelty has not yet been quantified in marine ecosystems. Here, we measured for the rate of novelty (RoN) in abiotic conditions and community structure for three trophic levels, i.e., phytoplankton, zooplankton, and fish, in a large marine system - the Baltic Sea. We measured RoN as the degree of dissimilarity relative to a specific spatial and temporal baseline, and contrasted this with the rate of change as a measure of within-basin change over time. We found that over the past 35 years abiotic and biotic RoN showed complex dynamics varying in time and space, depending on the baseline conditions. RoN in abiotic conditions was smaller in the open Central Baltic Sea than in the Kattegat and the more enclosed Gulf of Bothnia, Gulf of Riga, and Gulf of Finland in the north. We found a similar spatial pattern for biotic assemblages, which resulted from changes in composition and stock size. We identified sea-surface temperature and salinity as key drivers of RoN in biotic communities. Hence, future environmental changes that are expected to affect the biogeochemistry of the Baltic Sea, may favor the rise of biotic novelty. Our results highlighted the need for a deeper understanding of novelty development in marine ecosystems, including interactions between species and trophic levels, ecosystem functioning under novel abiotic conditions, and considering novelty in future management interventions.
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Affiliation(s)
- Yosr Ammar
- Stockholm Resilience CentreStockholm UniversityStockholmSweden
| | - Susa Niiranen
- Stockholm Resilience CentreStockholm UniversityStockholmSweden
| | - Saskia A. Otto
- Institute of Marine Ecosystem and Fishery ScienceCenter for Earth System Research and SustainabilityUniversity of HamburgHamburgGermany
| | - Christian Möllmann
- Institute of Marine Ecosystem and Fishery ScienceCenter for Earth System Research and SustainabilityUniversity of HamburgHamburgGermany
| | - Walter Finsinger
- ISEM, University of Montpellier, CNRS, IRD, EPHEMontpellierFrance
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15
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Wang B, Wu L, Chen D, Wu Y, Hu S, Li L, Bai Y. Grazing simplifies soil micro-food webs and decouples their relationships with ecosystem functions in grasslands. Glob Chang Biol 2020; 26:960-970. [PMID: 31529564 DOI: 10.1111/gcb.14841] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 09/02/2019] [Indexed: 06/10/2023]
Abstract
Livestock grazing often alters aboveground and belowground communities of grasslands and their mediated carbon (C) and nitrogen (N) cycling processes at the local scale. Yet, few have examined whether grazing-induced changes in soil food webs and their ecosystem functions can be extrapolated to a regional scale. We investigated how large herbivore grazing affects soil micro-food webs (microbes and nematodes) and ecosystem functions (soil C and N mineralization), using paired grazed and ungrazed plots at 10 locations across the Mongolian Plateau. Our results showed that grazing not only affected plant variables (e.g., biomass and C and N concentrations), but also altered soil substrates (e.g., C and N contents) and soil environment (e.g., soil pH and bulk density). Grazing had strong bottom-up effects on soil micro-food webs, leading to more pronounced decreases at higher trophic levels (nematodes) than at lower trophic levels (microbes). Structural equation modeling showed that changes in plant biomass and soil environment dominated grazing effects on microbes, while nematodes were mainly influenced by changes in plant biomass and soil C and N contents; the grazing effects, however, differed greatly among functional groups in the soil micro-food webs. Grazing reduced soil C and N mineralization rates via changes in plant biomass, soil C and N contents, and soil environment across grasslands on the Mongolian Plateau. Spearman's rank correlation analysis also showed that grazing reduced the correlations between functional groups in soil micro-food webs and then weakened the correlation between soil micro-food webs and soil C and N mineralization. These results suggest that changes in soil micro-food webs resulting from livestock grazing are poor predictors of soil C and N processes at regional scale, and that the relationships between soil food webs and ecosystem functions depend on spatial scales and land-use changes.
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Affiliation(s)
- Bing Wang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Liji Wu
- College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China
| | - Dima Chen
- College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
| | - Ying Wu
- Laboratory of Ecology and Evolutionary Biology, Yunnan University, Kunming, China
| | - Shuijin Hu
- Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Linghao Li
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yongfei Bai
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
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16
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Cairns J, Koskinen K, Penttinen R, Patinen T, Hartikainen A, Jokela R, Ruusulehto L, Viitamäki S, Mattila S, Hiltunen T, Jalasvuori M. Black Queen Evolution and Trophic Interactions Determine Plasmid Survival after the Disruption of the Conjugation Network. mSystems 2018; 3:e00104-18. [PMID: 30320219 DOI: 10.1128/mSystems.00104-18] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 08/30/2018] [Indexed: 01/21/2023] Open
Abstract
Bacterial antibiotic resistance is often a part of mobile genetic elements that move from one bacterium to another. By interfering with the horizontal movement and the maintenance of these elements, it is possible to remove the resistance from the population. Here, we show that a so-called plasmid-dependent bacteriophage causes the initially resistant bacterial population to become susceptible to antibiotics. However, this effect is efficiently countered when the system also contains a predator that feeds on bacteria. Moreover, when the environment contains antibiotics, the survival of resistance is dependent on the resistance mechanism. When bacteria can help their contemporaries to degrade antibiotics, resistance is maintained by only a fraction of the community. On the other hand, when bacteria cannot help others, then all bacteria remain resistant. The concentration of the antibiotic played a less notable role than the antibiotic used. This report shows that the survival of antibiotic resistance in bacterial communities represents a complex process where many factors present in real-life systems define whether or not resistance is actually lost. Mobile genetic elements such as conjugative plasmids are responsible for antibiotic resistance phenotypes in many bacterial pathogens. The ability to conjugate, the presence of antibiotics, and ecological interactions all have a notable role in the persistence of plasmids in bacterial populations. Here, we set out to investigate the contribution of these factors when the conjugation network was disturbed by a plasmid-dependent bacteriophage. Phage alone effectively caused the population to lose plasmids, thus rendering them susceptible to antibiotics. Leakiness of the antibiotic resistance mechanism allowing Black Queen evolution (i.e. a “race to the bottom”) was a more significant factor than the antibiotic concentration (lethal vs sublethal) in determining plasmid prevalence. Interestingly, plasmid loss was also prevented by protozoan predation. These results show that outcomes of attempts to resensitize bacterial communities by disrupting the conjugation network are highly dependent on ecological factors and resistance mechanisms. IMPORTANCE Bacterial antibiotic resistance is often a part of mobile genetic elements that move from one bacterium to another. By interfering with the horizontal movement and the maintenance of these elements, it is possible to remove the resistance from the population. Here, we show that a so-called plasmid-dependent bacteriophage causes the initially resistant bacterial population to become susceptible to antibiotics. However, this effect is efficiently countered when the system also contains a predator that feeds on bacteria. Moreover, when the environment contains antibiotics, the survival of resistance is dependent on the resistance mechanism. When bacteria can help their contemporaries to degrade antibiotics, resistance is maintained by only a fraction of the community. On the other hand, when bacteria cannot help others, then all bacteria remain resistant. The concentration of the antibiotic played a less notable role than the antibiotic used. This report shows that the survival of antibiotic resistance in bacterial communities represents a complex process where many factors present in real-life systems define whether or not resistance is actually lost.
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17
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Stoner DC, Sexton JO, Choate DM, Nagol J, Bernales HH, Sims SA, Ironside KE, Longshore KM, Edwards TC. Climatically driven changes in primary production propagate through trophic levels. Glob Chang Biol 2018; 24:4453-4463. [PMID: 30088318 DOI: 10.1111/gcb.14364] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 07/05/2018] [Accepted: 04/19/2018] [Indexed: 06/08/2023]
Abstract
Climate and land-use change are the major drivers of global biodiversity loss. Their effects are particularly acute for wide-ranging consumers, but little is known about how these factors interact to affect the abundance of large carnivores and their herbivore prey. We analyzed population densities of a primary and secondary consumer (mule deer, Odocoileus hemionus, and mountain lion, Puma concolor) across a climatic gradient in western North America by combining satellite-based maps of plant productivity with estimates of animal abundance and foraging area derived from Global Positioning Systems telemetry data (GPS). Mule deer density exhibited a positive, linear relationship with plant productivity (r2 = 0.58), varying by a factor of 18 across the climate-vegetation gradient (range: 38-697 individuals/100 km2 ). Mountain lion home range size decreased in response to increasing primary productivity and consequent changes in the abundance of their herbivore prey (range: 20-450 km2 ). This pattern resulted in a strong, positive association between plant productivity and mountain lion density (r2 = 0.67). Despite varying densities, the ratio of prey to predator remained constant across the climatic gradient (mean ± SE = 363 ± 29 mule deer/mountain lion), suggesting that the determinacy of the effect of primary productivity on consumer density was conserved across trophic levels. As droughts and longer term climate changes reduce the suitability of marginal habitats, consumer home ranges will expand in order for individuals to meet basic nutritional requirements. These changes portend decreases in the abundance of large-bodied, wide-ranging wildlife through climatically driven reductions in carrying capacity, as well as increased human-wildlife interactions stemming from anthropogenic land use and habitat fragmentation.
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Affiliation(s)
- David C Stoner
- Department of Wildland Resources, Utah State University, Logan, Utah
| | - Joseph O Sexton
- Global Land Cover Facility, Department of Geographical Sciences, University of Maryland, College Park, Maryland
- terraPulse, Inc., North Potomac, Maryland
| | - David M Choate
- School of Life Sciences, University of Nevada, Las Vegas, Nevada
| | - Jyothy Nagol
- Global Land Cover Facility, Department of Geographical Sciences, University of Maryland, College Park, Maryland
| | | | - Steven A Sims
- Department of Wildland Resources, Utah State University, Logan, Utah
| | - Kirsten E Ironside
- U.S. Geological Survey, Southwest Biological Science Center, Flagstaff, Arizona
| | - Kathleen M Longshore
- U.S. Geological Survey, Western Ecological Research Center, Las Vegas Field Station, Henderson, Nevada
| | - Thomas C Edwards
- Department of Wildland Resources, Utah State University, Logan, Utah
- U.S. Geological Survey, Utah Cooperative Fish and Wildlife Research Unit, Quinney College of Natural Resources, Utah State University, Logan, Utah
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18
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Abstract
The body of work relating to the gut microbiota of fish is dwarfed by that on humans and mammals. However, it is a field that has had historical interest and has grown significantly along with the expansion of the aquaculture industry and developments in microbiome research. Research is now moving quickly in this field. Much recent focus has been on nutritional manipulation and modification of the gut microbiota to meet the needs of fish farming, while trying to maintain host health and welfare. However, the diversity amongst fish means that baseline data from wild fish and a clear understanding of the role that specific gut microbiota play is still lacking. We review here the factors shaping marine fish gut microbiota and highlight gaps in the research.
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Affiliation(s)
- Sian Egerton
- School of Microbiology, University College Cork, Cork, Ireland.,School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland
| | - Sarah Culloty
- School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland.,Environmental Research Institute, University College Cork, Cork, Ireland
| | - Jason Whooley
- Bio-marine Ingredients Ireland Ltd., Killybegs, Ireland
| | - Catherine Stanton
- Teagasc Research Centre, Fermoy, Ireland.,APC Microbiome Ireland, Teagasc and University College Cork, Cork, Ireland
| | - R Paul Ross
- School of Microbiology, University College Cork, Cork, Ireland.,Teagasc Research Centre, Fermoy, Ireland.,APC Microbiome Ireland, Teagasc and University College Cork, Cork, Ireland
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19
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Abstract
The natural, prehuman abundance of most large predators is unknown because of the lack of historical data and a limited understanding of the natural factors that control their populations. Determining the supportable predator biomass at a given location (that is, the predator carrying capacity) would help managers to optimize protection and would provide site-specific recovery goals. We assess the relationship between predatory reef fish biomass and several anthropogenic and environmental variables at 39 reefs across the Caribbean to (i) estimate their roles determining local predator biomass and (ii) determine site-specific recovery potential if fishing was eliminated. We show that predatory reef fish biomass tends to be higher in marine reserves but is strongly negatively related to human activities, especially coastal development. However, human activities and natural factors, including reef complexity and prey abundance, explain more than 50% of the spatial variation in predator biomass. Comparing site-specific predator carrying capacities to field observations, we infer that current predatory reef fish biomass is 60 to 90% lower than the potential supportable biomass in most sites, even within most marine reserves. We also found that the scope for recovery varies among reefs by at least an order of magnitude. This suggests that we could underestimate unfished biomass at sites that provide ideal conditions for predators or greatly overestimate that of seemingly predator-depleted sites that may have never supported large predator populations because of suboptimal environmental conditions.
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Affiliation(s)
- Abel Valdivia
- Center for Biological Diversity, 1212 Broadway Suite 800, Oakland, CA 94612, USA
- Corresponding author.
| | - Courtney Ellen Cox
- National Museum of Natural History, 1000 Constitution Avenue Northwest, Washington, DC 20560, USA
| | - John Francis Bruno
- Department of Biology, University of North Carolina at Chapel Hill, Wilson Hall, 120 South Road, Chapel Hill, NC 27599, USA
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20
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Samplonius JM, Kappers EF, Brands S, Both C. Phenological mismatch and ontogenetic diet shifts interactively affect offspring condition in a passerine. J Anim Ecol 2016; 85:1255-64. [PMID: 27263989 DOI: 10.1111/1365-2656.12554] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 05/18/2016] [Indexed: 11/30/2022]
Abstract
Climate change may cause phenological asynchrony between trophic levels, which can lead to mismatched reproduction in animals. Although indirect effects of mismatch on fitness are well described, direct effects on parental prey choice are not. Moreover, direct effects of prey variation on offspring condition throughout their early development are understudied. Here, we used camera trap data collected over 2 years to study the effects of trophic mismatch and nestling age on prey choice in pied flycatchers (Ficedula hypoleuca). Furthermore, we studied the effect of mismatch and variation in nestling diet on offspring condition. Both experimentally induced and natural mismatches with the caterpillar peak negatively affected absolute and relative numbers of caterpillars and offspring condition (mass, tarsus and wing length) and positively affected absolute and relative numbers of flying insects in the nestling diet. Feeding more flying insects was negatively correlated with nestling day 12 mass. Both descriptive and experimental data showed preferential feeding of spiders when nestlings were <7 days old. Receiving more spiders during this phase was positively correlated with tarsus growth. These results highlight the need for a more inclusive framework to study phenological mismatch in nature. The general focus on only one prey type, the rarity of studies that measure environmental abundance of prey, and the lack of timing experiments in dietary studies currently hamper understanding of the actual trophic interactions that affect fitness under climate change.
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Affiliation(s)
- Jelmer M Samplonius
- Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, P.O. Box 11103, 9700CC, Groningen, The Netherlands
| | - Elena F Kappers
- Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, P.O. Box 11103, 9700CC, Groningen, The Netherlands
| | - Stef Brands
- Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, P.O. Box 11103, 9700CC, Groningen, The Netherlands
| | - Christiaan Both
- Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, P.O. Box 11103, 9700CC, Groningen, The Netherlands
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21
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Paterson JT, Rotella JJ, Arrigo KR, Garrott RA. Tight coupling of primary production and marine mammal reproduction in the Southern Ocean. Proc Biol Sci 2016; 282:20143137. [PMID: 25854885 DOI: 10.1098/rspb.2014.3137] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Polynyas are areas of open water surrounded by sea ice and are important sources of primary production in high-latitude marine ecosystems. The magnitude of annual primary production in polynyas is controlled by the amount of exposure to solar radiation and sensitivity to changes in sea-ice extent. The degree of coupling between primary production and production by upper trophic-level consumers in these environments is not well understood, which prevents reliable predictions about population trajectories for species at higher trophic levels under potential future climate scenarios. In this study, we find a strong, positive relationship between annual primary production in an Antarctic polynya and pup production by ice-dependent Weddell seals. The timing of the relationship suggests reproductive effort increases to take advantage of high primary production occurring in the months after the birth pulse. Though the proximate causal mechanism is unknown, our results indicate tight coupling between organisms at disparate trophic levels on a short timescale, deepen our understanding of marine ecosystem processes, and raise interesting questions about why such coupling exists and what implications it has for understanding high-latitude ecosystems.
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Affiliation(s)
| | - Jay J Rotella
- Department of Ecology, Montana State University, Bozeman, MT 59717, USA
| | - Kevin R Arrigo
- Department of Environmental Earth System Science, Stanford University, Stanford, CA 94305-4216, USA
| | - Robert A Garrott
- Department of Ecology, Montana State University, Bozeman, MT 59717, USA
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22
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Stevens VM, Whitmee S, Le Galliard JF, Clobert J, Böhning-Gaese K, Bonte D, Brändle M, Matthias Dehling D, Hof C, Trochet A, Baguette M. A comparative analysis of dispersal syndromes in terrestrial and semi-terrestrial animals. Ecol Lett 2014; 17:1039-52. [PMID: 24915998 DOI: 10.1111/ele.12303] [Citation(s) in RCA: 172] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 03/04/2014] [Accepted: 05/05/2014] [Indexed: 11/30/2022]
Abstract
Dispersal, the behaviour ensuring gene flow, tends to covary with a number of morphological, ecological and behavioural traits. While species-specific dispersal behaviours are the product of each species' unique evolutionary history, there may be distinct interspecific patterns of covariation between dispersal and other traits ('dispersal syndromes') due to their shared evolutionary history or shared environments. Using dispersal, phylogeny and trait data for 15 terrestrial and semi-terrestrial animal Orders (> 700 species), we tested for the existence and consistency of dispersal syndromes across species. At this taxonomic scale, dispersal increased linearly with body size in omnivores, but decreased above a critical length in herbivores and carnivores. Species life history and ecology significantly influenced patterns of covariation, with higher phylogenetic signal of dispersal in aerial dispersers compared with ground dwellers and stronger evidence for dispersal syndromes in aerial dispersers and ectotherms, compared with ground dwellers and endotherms. Our results highlight the complex role of dispersal in the evolution of species life-history strategies: good dispersal ability was consistently associated with high fecundity and survival, and in aerial dispersers it was associated with early maturation. We discuss the consequences of these findings for species evolution and range shifts in response to future climate change.
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Affiliation(s)
- Virginie M Stevens
- CNRS USR 2936 Station d'Ecologie Expérimentale de Moulis. Route du CNRS, 09200, Moulis, France
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23
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Diogo H, Pereira JG. Assessing the potential biological implications of recreational inshore fisheries on sub-tidal fish communities of Azores (north-east Atlantic Ocean) using catch and effort data. J Fish Biol 2014; 84:952-970. [PMID: 24665895 DOI: 10.1111/jfb.12336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 01/08/2014] [Accepted: 01/08/2014] [Indexed: 06/03/2023]
Abstract
Recreational inshore fishing activities practiced on Faial and Pico Islands (Azorean archipelago) were surveyed between October 2004 and September 2005. Recreational inshore fishers employ three main methods of fishing (shore angling, spear fishing and intertidal collecting). The method that demanded the highest fishing effort (number of fishing operations) was shore angling, followed by intertidal collecting and spear fishing. Shore angling produced the highest diversity of catch composition (38), which is in part explained by the seven fishing techniques used by shore anglers. The estimates of annual catch were higher for shore angling than spear fishing (51·2 and 6·3 t) even though they were lower than commercial artisanal fishing (442 t). The weighted mean trophic level and vulnerability index values in the fish catch were higher for spear fishing (3·4 and 50·9) than for shore angling (3·1 and 44·5). Cumulative pressure by different recreational fishing activities was detected on species already subject to a heavy pressure from Azorean commercial fishing, and on vulnerable and top-predator species. There are important biological and ecological implications whereby fishery managers should implement additional regulations such as prohibiting catches of the most vulnerable species.
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Affiliation(s)
- H Diogo
- University of Azores, Department of Oceanography and Fisheries, Rua Prof. Doutor Frederico Machado, 9901-862 Horta, Portugal
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24
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Hosseini M, Nabavi SMB, Parsa Y. Bioaccumulation of trace mercury in trophic levels of benthic, benthopelagic, pelagic fish species, and sea birds from Arvand River, Iran. Biol Trace Elem Res 2013; 156:175-80. [PMID: 24174062 PMCID: PMC3844145 DOI: 10.1007/s12011-013-9841-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Accepted: 10/02/2013] [Indexed: 11/01/2022]
Abstract
In this study, concentration of mercury was determined in the trophic levels of benthic, benthopelagic, pelagic fish species, and river birds from Arvand River, located in the Khuzestan province in the lowlands of southwestern Iran at the head of the Persian Gulf. The order of mercury concentrations in tissues of the fish species was as follows: liver>gill>muscle and in tissues of the kingfisher species was as follows: feather>liver>kidney>muscle. Therefore, liver in fish and feather in kingfisher exhibited higher mercury concentration than the other tissues. There was a positive correlation between mercury concentrations in fish and kingfisher species with size of its food items. We expected to see higher mercury levels in tissues of female species because they are larger and can eat larger food items. The results of this study show that the highest mean mercury level were found in the kingfisher (Anas crecca), followed by benthic (Epinephelus diacanthus), benthopelagic (Chanos chanos), and pelagic fish (Strongylura strongylura). Mean value of mercury in fish species, S. strongylura were (0.61 μg g(-1) dry weight), C. chanos (0.45 μg g(-1) dry weight), E. diacanthus (0.87 μg g(-1) dry weight), and in kingfisher species A. crecca was (2.64 μg g(-1) dry weight). Significant correlation between mercury concentration in fish and kingfisher may be related to high variability of mercury in the fish.
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Affiliation(s)
- Mehdi Hosseini
- Department of Marine Biology, Faculty of Biological Science, Shahid Beheshti University, P.O. Box: 669, Tehran, Iran,
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25
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Pulgar J, Poblete E, Alvarez M, Morales JP, Aranda B, Aldana M, Pulgar VM. Can upwelling signals be detected in intertidal fishes of different trophic levels? J Fish Biol 2013; 83:1407-1415. [PMID: 24117929 DOI: 10.1111/jfb.12220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 07/30/2013] [Indexed: 06/02/2023]
Abstract
For intertidal fishes belonging to three species, the herbivore Scartichthys viridis (Blenniidae), the omnivore Girella laevifrons (Kyphosidae) and the carnivore Graus nigra (Kyphosidae), mass and body size relationships were higher in individuals from an upwelling zone compared with those from a non-upwelling zone. RNA:DNA were higher in the herbivores and omnivores from the upwelling zone. Higher biomass and RNA:DNA in the upwelling intertidal fishes may be a consequence of an increased exposure to higher nutrient availability, suggesting that increased physiological conditioning in vertebrates from upwelling areas can be detected and measured using intertidal fishes of different trophic levels.
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Affiliation(s)
- J Pulgar
- Departamento de Ecología & Biodiversidad, República 470, piso 3, Universidad Andres Bello, Santiago, Chile
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26
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Vedder O, Bouwhuis S, Sheldon BC. The contribution of an avian top predator to selection in prey species. J Anim Ecol 2013; 83:99-106. [PMID: 24028434 DOI: 10.1111/1365-2656.12114] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 06/15/2013] [Indexed: 11/28/2022]
Abstract
Natural selection can vary in magnitude, form and direction, yet the causes of selection, and of variation in selection, are poorly understood. We quantified the effect of a key predator (Eurasian sparrowhawks) on selection on fledging body mass in two bird species (blue tits and great tits). By partitioning selection into within- and between-brood components, we were able to separate individual from brood-level effects of fledging mass on predation probability and recruitment. In blue tits, selection on fledging mass by sparrowhawk predation was nonsignificant and could not explain selection to recruitment. In contrast, in great tits, sparrowhawk predation selected for increased fledging mass at the individual level and could explain 73% of individual-level selection on fledging mass to recruitment. Moreover, in great tits, individual-level selection on fledging mass was significantly stronger in years in which sparrowhawks were present compared to years when sparrowhawks were absent. Selection at the brood level was independent of sparrowhawk presence. These results provide compelling evidence that sparrowhawk predation acts as an important causal agent of selection on fledging mass in great tits but not in blue tits. Variation in predation pressure can therefore account for variation in selection, but specific patterns may not be easily generalized across species.
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Affiliation(s)
- Oscar Vedder
- Department of Zoology, Edward Grey Institute, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK
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Abstract
Aposematism (warning) signaling is a common defensive mechanism toward predatory or herbivorous animals, i.e., interactions between different trophic levels. I propose that it should be considered at least as a working hypothesis that chemical aposematism operates between certain host plants and their plant predators, parasitic plants, and that although they are also plants, they belong to a higher trophic level. Specific host plant genotypes emit known repelling chemical signals toward parasitic plants, which reduce the level of, slow the directional parasite growth (attack) toward the signaling hosts, or even cause parasitic plants to grow away from them in response to these chemicals. Chemical host aposematism toward parasitic plants may be a common but overlooked defense from parasitic plants.
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