Life history variation in native and non-native fishes

我的研究将集中在两个入侵物种，南瓜太阳鱼和圆虾虎鱼的生活史和形态特征。我将确定引进的种群是否在非本地环境中表现出特殊的适应性，这种差异是否与物理或生物环境有关，以及它们是否已经成为这些引进种群的遗传组成的一部分。南瓜籽是在19世纪末引入欧洲的，并被认为是整个南欧大部分地区的入侵。 我将研究它的繁殖，形态和遗传学在本地和引进的范围，以确定本地和非本地人口之间的主要差异。 我还将对在共同环境中饲养的不同来源的南瓜籽进行实验，以解释在自然界中观察到的差异。圆虾虎鱼是最近的欧亚入侵者，已成为加拿大的一个严重问题。我将比较虾虎鱼的人口和生殖属性，他们是很好的建立与那些在其不断扩大的范围的边缘，以确定这种鱼是否成功地改变其生活史的战略，因为它变得更加成熟。我将确定是否范围扩大发生主要是通过迁移的少年或adulter.The拟议南瓜籽研究建立在17年的生活史调查本地和引进的人口，并提供了一个独特的机会来解释为什么水生物种是成功的入侵者在某些地区，而不是在其他地区。虾虎鱼的研究将填补我们对该物种在其非本土范围内的知识的一个主要空白，并可以解释入侵种群如何应对扩张的机会。

My research will focus on the life history and morphological characteristics of two invasive species, the pumpkinseed sunfish and the round goby. I will determine whether introduced populations show particular adaptations in non-native environments, whether such differences can be related to the physical or biological environment, and if they have become part of the genetic makeup of these introduced populations.The pumpkinseed was introduced in Europe in the late 1800's, and is considered invasive throughout much of southern Europe.  I will study its reproduction, morphology and genetics across the native and introduced range to identify major differences between native and non-native populations.  I will also conduct experiments with pumpkinseeds of different origins reared in a common environment in order to explain the differences observed in nature. The round goby is recent Eurasian invader that has become a serious problem in Canada. I will compare population and reproductive attributes of gobies where they are well established with those at the edge of their expanding range to determine whether this fish succeeds by changing its life history strategy as it becomes more established. I will determine whether range expansion occurs mainly through the migration of juveniles or adults.The proposed pumpkinseed research builds upon 17 years of life history investigations on native and introduced populations, and provides a unique opportunity to explain why aquatic species are successful invaders in some regions and not in others. The goby research would fill in a major gap in our knowledge of the species in its non-native range, and could explain how invasive populations respond to opportunities for expansion.