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Facultative oligohaline habitat use in a mobile fish inferred from scale chemistry

机译：从规模化学推断流动性鱼类的兼性寡盐栖息地用途

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Reconstructing fish movements is critical to understand the diversity of habitats required to sustain mobile species. Chemical constituents in otoliths have been invaluable for the field of fish migration ecology to track natal origins and reconstruct lifetime movement patterns. However, alternative non-lethal structures, such as scales, are preferred for imperiled species to avoid mortality. We analyzed 29 individual scales from highly migratory and vulnerable Atlantic tarpon Megalops atlanticus (hereafter referred to as tarpon) in the Gulf of Mexico to identify migrations across salinity gradients and associated trophic shifts using paired measurements of elemental (Sr/Ca) and isotopic (delta C-13 and delta N-15) proxies. Although tarpon can inhabit freshwater, the specific patterns of facultative oligohaline habitat use are unknown. Individual scale-based salinity and diet histories were highly variable, with 4 contingents identified depending on the presence and sequence of movements. Scale salinity proxies (Sr/Ca and delta C-13) indicated that tarpon spent on average 42 +/- 34% of their scale-based life histories within oligohaline habitats. Trans haline movements were accompanied by shifts in delta N-15 that indicated putative trophic shifts between marine or estuarine and oligohaline food webs. Oligohaline habitat use is common yet individually facultative for tarpon. This information is critical to devise sustainable fisheries management plans that account for the full range of diverse habitats used by this species throughout its life. Chemical analyses of scales have the potential to be broadly informative about migrations and trophic interactions in species where lethal methods must be avoided.
机译：重建鱼类运动对于了解维持流动物种所需的生境多样性至关重要。耳石中的化学成分对于鱼类迁徙生态学领域追踪出生起源和重建终生运动模式具有不可估量的价值。但是，对于濒临灭绝的物种，优选使用其他非致命性结构（例如鳞片）以避免死亡。我们分析了来自墨西哥湾高度迁徙和脆弱的大西洋油Megalops atlanticus（以下简称油pon）的29个个体尺度，以通过元素（Sr / Ca）和同位素（δ）的成对测量来识别盐度梯度和相关营养移动的迁移。 C-13和增量N-15）代理。虽然塔彭可以栖息在淡水中，但尚不知道使用兼性寡盐栖息地的具体方式。基于个体比例的盐度和饮食历史变化很大，根据运动的存在和顺序确定了4个分队。规模盐度代理（Sr / Ca和δC-13）表明，鱼在寡盐生境中平均度过了基于规模的生活史的42 +/- 34％。跨盐运动伴随着N-15三角洲的变化，表明海洋或河口和寡盐食物网之间的假定营养变化。少盐碱生境的使用是常见的，但对于是有利的。这些信息对于制定可持续的渔业管理计划至关重要，该计划应考虑到该物种一生所使用的各种多样的生境。规模的化学分析有可能广泛地提供必须避免使用致命方法的物种中的迁移和营养相互作用的信息。

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