FIELD AND LABORATORY OBSERVATIONS ON MICROHABITAT SELECTION IN THE AMPHIBIOUS RED-SEA ROCKSKIPPER FISH, ALTICUS-KIRKI (FAMILY BLENNIIDAE)
FIELD AND LABORATORY OBSERVATIONS ON MICROHABITAT SELECTION IN THE AMPHIBIOUS RED-SEA ROCKSKIPPER FISH, ALTICUS-KIRKI (FAMILY BLENNIIDAE)
复制标题
DOI：
10.1080/10236249109378789
复制
发表时间：
1991-01-01
期刊：
影响因子：
--
通讯作者：
CHIN, HG
中科院分区：
文献类型：
--
作者：
BROWN, CR;GORDON, MS;CHIN, HG
的生理和行为特征的潮间两栖鱼，Alticus kirki，说明了一种适应性的模式，可能是重要的脊椎动物在泥盆纪时期的土地入侵。野外观测表明，Alticus是昼夜活动的，大部分活动时间都在水面上，但靠近潮汐变化的水线。它们的非生物环境很复杂，为它们提供了许多微生境的选择。它们不进行体温调节，可能永远不需要与蒸发的水分损失作斗争。它们自愿留在水温高达36°C和水盐度高达64 ppt的环境中。我们还进行了实验室实验，测试鱼对三个变量的特定生态显著范围的偏好：土地与水，温度和盐度。在给定的条件下，对土地与水的偏好很强，但当实验条件改变时，这种偏好也会改变。湿岩石与水（盐度0-50 ppt）的选择导致对岩石的偏好，90%的时间没有水接触。使用潮湿岩石的可比实验产生了相反的结果：90%的时间与水连续接触的偏好，包括62%的时间完全浸没。石弹涂鱼在26°C附近有一个狭窄的水热偏好范围。然而，在个体和动物群体之间观察到显著差异，群体选择略低的温度。与此相反，盐度偏好研究表明，这种动物几乎没有能力区分不同盐度的沃茨。动物自由进入盐度范围为0-60 ppt的沃茨。他们避免盐度超过70 ppt。它们对30-40 ppt范围内的进水表现出轻微的偏好。
The physiological and behavioral characteristics of the intertidal amphibious blenny,Alticus kirki, illustrate an adaptive pattern that could have been important in the invasion of the land by vertebrates during the Devonian period. Field observations show thatAlticusare diurnal and spend most of their active time out of water, above but near the tidally varying water line. Their abiotic environment is complex, providing them with many choices of microhabitat. They do not thermoregulate behaviorally and probably never need to contend with evaporative water losses. They voluntarily remain in water temperatures as high as 36°C and water salinities as high as 64 ppt. They prefer high light intensities.We also performed laboratory experiments testing the preferences of the fish for specific ecologically significant ranges of three variables: land vs water, temperature, and salinity. Preferences for land vs water were strong in given sets of conditions, but changed when experimental conditions changed. The choice of wet rocks vs water (salinity 0–50 ppt) resulted in preferences for the rocks, with no water contact, 90% of the time. Comparable experiments using moist rocks produced the opposite result: preferences for continuous contact with water 90% of the time, including full submersion 62% of the time. Rockskippers have a narrow aquatic thermal preference range near 26°C. A significant difference was observed, however, between individuals and groups of animals, groups choosing slightly lower temperatures. In contrast, salinity preference studies indicated little ability of the animal to discriminate between waters of different salinities. Animals freely entered waters of salinities ranging from 0–60 ppt. They avoided salinities above 70 ppt. They showed a slight preference for entering water in the 30–40 ppt range.