Breen Christopher J, Cahill Abigail E
Biology Department, Albion College, Albion, Michigan, USA.
PeerJ. 2021 Nov 9;9:e12378. doi: 10.7717/peerj.12378. eCollection 2021.
Inland salt marshes are a rare habitat in North America. Little is known about the invertebrates in these habitats and their ability to cope with the brackish conditions of the marsh. We studied the population growth of ostracods found in an inland salt marsh (Maple River salt marsh) and of copepods found in the wetland habitat immediately adjacent to the freshwater Kalamazoo River. By studying these species in water from both habitats, we aimed to find out if they performed differently in the two habitats. We also tested in water from the two habitats due to the history of spp. as model organisms. We found that copepods performed better in water taken from the Maple River salt marsh, and the ostracods and performed equally well in either water. This was unexpected, since ostracods are found in the salt marsh and copepods in the freshwater area. As a second experiment, we tested the invertebrates in pairwise interactions. In water from the Kalamazoo River, ostracods outperformed the other two species, but there was no difference between and copepods. No species outperformed the other in salt marsh water. Our results show no local adaptation to salinity, suggesting that ostracods and copepods may be limited in their respective distributions by dispersal limitation or habitat suitability.
内陆盐沼是北美一种稀有的栖息地。对于这些栖息地中的无脊椎动物以及它们应对盐沼微咸环境的能力，人们了解甚少。我们研究了在内陆盐沼（枫河盐沼）中发现的介形虫以及紧邻淡水卡拉马祖河的湿地栖息地中发现的桡足类动物的种群增长情况。通过在来自这两种栖息地的水中研究这些物种，我们旨在弄清楚它们在这两种栖息地中的表现是否有所不同。由于 spp. 作为模式生物的历史，我们还在来自这两种栖息地的水中进行了测试。我们发现桡足类动物在取自枫河盐沼的水中表现更好，而介形虫和 在两种水中的表现相当。这是出乎意料的，因为介形虫存在于盐沼中，而桡足类动物存在于淡水区域。作为第二个实验，我们在成对相互作用中测试了这些无脊椎动物。在来自卡拉马祖河的水中，介形虫的表现优于其他两个物种，但 和桡足类动物之间没有差异。在盐沼水中没有一个物种的表现优于其他物种。我们的结果表明没有对盐度的局部适应性，这表明介形虫和桡足类动物在其各自分布中可能受到扩散限制或栖息地适宜性的限制。
