Salinity Characteristics of Rocky Cliff Pools Used as Breeding Habitat by Spotted Salamanders (Ambystoma maculatum)

IF 0.5 4区环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Northeastern Naturalist Pub Date : 2023-06-29 DOI:10.1656/045.030.0207

S. Ressel, Emma E. Damm, Wriley Hodge, Georgia Q. Lattig, Tess Moore, We REASoN, Judith A. Tunstad, Jasper White

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Abstract

Abstract - Ambystoma maculatum (Spotted Salamander) is a widely distributed species in the eastern United States whose aquatic breeding habitat has been well documented as being hydrologically diverse but always freshwater in chemical composition. On Mount Desert Island, ME, a population of Spotted Salamanders breed in an aggregation of pools located atop a coastal rock cliff that is subject to seawater intrusion from nearby wave action. We periodically measured salinity concentrations (in ppt) of 7 pools with the highest breeding activity from 2016 to 2021 to quantify pool salinities within and between 5 breeding seasons. Our findings confirm that this breeding habitat experiences sporadic and extreme bouts of salt intrusion from the adjacent ocean, causing salinity levels to vary markedly and unpredictably (0.1 ppt to 32.5 ppt) on a spatiotemporal scale. The presence of salamanders exhibiting apparent normal behavior in salinities greater than 12 ppt suggest an upper threshold of salt tolerance in this population that exceeds purported upper thresholds for the majority of amphibians studied to date. Future experimental work on this population holds great promise to deepen our understanding of the underlying mechanisms of salt tolerance in coastal populations of amphibians from both a physiological and evolutionary perspective.

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斑点蝾螈(Ambystoma maculatum)栖息地岩崖池的盐度特征

摘要斑点蝾螈(Ambystoma maculatum)是一种广泛分布于美国东部的物种，其水生繁殖栖息地已被充分记录为水文多样性，但化学成分总是淡水。在缅因州的芒特沙漠岛，一群斑点蝾螈在位于海岸岩石悬崖顶部的一群水池中繁殖，这些水池受到附近海浪作用的海水入侵。从2016年到2021年，我们定期测量了7个繁殖活动最活跃的水池的盐度浓度(ppt)，以量化5个繁殖季节内和之间的水池盐度。我们的研究结果证实，这一繁殖栖息地经历了来自邻近海洋的零星和极端的盐入侵，导致盐度水平在时空尺度上发生了不可预测的显著变化(0.1 ppt至32.5 ppt)。蝾螈在高于12 ppt的盐度下表现出明显的正常行为，这表明该种群的耐盐上限超过了迄今为止研究的大多数两栖动物的上限。未来对这一种群的实验工作有望从生理和进化的角度加深我们对沿海两栖动物种群耐盐性的潜在机制的理解。

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来源期刊

Northeastern Naturalist 环境科学-生态学

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： The Northeastern Naturalist covers all aspects of the natural history sciences of terrestrial, freshwater, and marine organisms and the environments of the northeastern portion of North America, roughly bounded from Virginia to Missouri, north to Minnesota and Nunavut, east to Newfoundland, and south back to Virginia. Manuscripts based on field studies outside of this region that provide information on species within this region may be considered at the Editor’s discretion. The journal welcomes manuscripts based on observations and research focused on the biology of terrestrial, freshwater, and marine organisms and communities as it relates to their life histories and their function within, use of, and adaptation to the environment and the habitats in which they are found, as well as on the ecology and conservation of species and habitats. Such studies may encompass measurements, surveys, and/or experiments in the field, under lab conditions, or utilizing museum and herbarium specimens. Subject areas include, but are not limited to, anatomy, behavior, biogeography, biology, conservation, evolution, ecology, genetics, parasitology, physiology, population biology, and taxonomy. Strict lab, modeling, and simulation studies on natural history aspects of the region, without any field component, will be considered for publication as long as the research has direct and clear significance to field naturalists and the manuscript discusses these implications.