| 来源类型 | Article |
| 规范类型 | 其他 |
| DOI | 10.1093/conphys/cox010 |
| Effects of ambient oxygen and size-selective mortality on growth and maturation in guppies. | |
| Diaz Pauli B; Kolding J; Jeyakanth G; Heino M | |
| 发表日期 | 2017 |
| 出处 | Conservation Physiology 5 (1): 1-13 |
| 出版年 | 2017 |
| 语种 | 英语 |
| 摘要 | Growth, onset of maturity and investment in reproduction are key traits for understanding variation in life-history strategies. Many environmental factors affect variation in these traits, but for fish, hypoxia and size-dependent mortality have become increasingly important because of human activities, such as increased nutrient enrichment (eutrophication), climate warming and selective fishing. Here, we study experimentally the effect of oxygen availability on maturation and growth in guppies (Poecilia reticulata) from two different selected lines, one subjected to positive and the other negative size-dependent fishing. This is the first study to assess the effects of both reduced ambient oxygen and size-dependent mortality in fish. We show that reduced ambient oxygen led to stunting, early maturation and high reproductive investment. Likewise, lineages that had been exposed to high mortality of larger-sized individuals displayed earlier maturation at smaller size, greater investment in reproduction and faster growth. These life-history changes were particularly evident for males. The widely reported trends towards earlier maturation in wild fish populations are often interpreted as resulting from size-selective fishing. Our results highlight that reduced ambient oxygen, which has received little experimental investigation to date, can lead to similar phenotypic changes. Thus, changes in ambient oxygen levels can be a confounding factor that occurs in parallel with fishing, complicating the causal interpretation of changes in life-history traits. We believe that better disentangling of the effects of these two extrinsic factors, which increasingly affect many freshwater and marine ecosystems, is important for making more informed management decisions. |
| 主题 | Evolution and Ecology (EEP) |
| 关键词 | Eutrophication, fishing selection, hypoxia, life history, Poecilia reticulata, water management |
| URL | http://pure.iiasa.ac.at/id/eprint/14541/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/130875 |
| 推荐引用方式 GB/T 7714 | Diaz Pauli B,Kolding J,Jeyakanth G,et al. Effects of ambient oxygen and size-selective mortality on growth and maturation in guppies.. 2017. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| cox010.pdf（469KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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