Long‐term study of the reproductive timing of the Neotropical catfish Iheringichthys labrosus (Lütken, 1874): Influence of temperature and river discharge
| Autor: | Ivan González-Bergonzoni, Anahí López-Rodríguez, Giancarlo Tesitore, Samanta Stebniki, Joaquin Pais, Franco Teixeira de Mello, Nicolás Vidal, Ivana Silva, Alejandro D’Anatro |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Ecology Discharge 010604 marine biology & hydrobiology media_common.quotation_subject Context (language use) Fish reproduction Aquatic Science Biology 010603 evolutionary biology 01 natural sciences Latitude Gonadosomatic Index Neotropical fish Temperate climate Reproduction Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Ecology of Freshwater Fish. 29:334-345 |
| ISSN: | 1600-0633 0906-6691 |
| DOI: | 10.1111/eff.12518 |
| Popis: | Unravelling the effect of climate variability on species biology has been one of the main goals of ecological studies. Environmental factors such as river discharge and temperature have being proposed as triggers of reproductive cycle in fish. In temperate climates, fish reproduction is affected mainly by temperature, while is influenced by flood pulses in large tropical rivers. We evaluated the influence of temperature and river discharge as triggers of Iheringichthys labrosus’ reproduction. We studied the following reproductive variables: gonadosomatic index (GSI), hepatosomatic index (HSI) and condition factor (K). Females of I. labrosus were examined in a time series of ten years along three sites located in Lower Uruguay River at the beginning (last week of November‐first week of December, spring) and by the end of the reproductive period (middle‐end of April, autumn). Generalised linear models detected a positive effect of mean winter temperature and site on the spring mature female GSI. Site was significant in addition to the interaction between temperature and site. Moreover, the effect of winter temperature was stronger than water discharge in triggering reproductive timing of I. labrosus, contrary to the model proposed for other species in tropical systems. Additionally, a literature review suggested a latitudinal gradient on reproduction, occurring earlier and prolonged with decreasing latitude (and increasing temperature). In this study, we stated the effect of temperature on the life history in a Neotropical fish using a multifaceted approach, particularly important in the current context of global climate warming. |
| Databáze: | OpenAIRE |
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