The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Gordon D Mcdonald - One of the best experts on this subject based on the ideXlab platform.
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the role of temperature in controlling Diel Activity in upstream migrant sea lampreys petromyzon marinus
Canadian Journal of Fisheries and Aquatic Sciences, 2008Co-Authors: Thomas R Binder, Gordon D McdonaldAbstract:This study used controlled laboratory conditions to directly assess the role of temperature in controlling Diel Activity in sexually immature, upstream migrant sea lampreys (Petromyzon marinus). Our results identified three separate temperature-induced changes to the normal nocturnal Activity pattern of lampreys: (i) at low temperature (7 °C), lampreys became inactive; (ii) at high temperatures (≥20 °C), the normal nocturnal peak in Activity was reduced and lampreys became active during the day; and (iii) rapid increases in temperature (7 or 8 °C over 4 h) stimulated transient daytime Activity that subsided once temperature stabilized. In addition, we found evidence that temperature directly influences other aspects of sea lampreys behaviour, specifically light avoidance and rheotaxis. We propose that temperature-induced changes in Diel Activity represent adaptive behaviour, increasing the probability of lampreys reaching the spawning grounds within the narrow thermal range for successful embryonic develo...
Ellen J Marsden - One of the best experts on this subject based on the ideXlab platform.
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Diel Activity of newly metamorphosed juvenile sea lamprey petromyzon marinus
PLOS ONE, 2019Co-Authors: Scott M. Miehls, Christopher M Holbrook, Ellen J MarsdenAbstract:Timing of Activity, especially for juvenile anadromous fishes undertaking long migrations can be critical for survival. River-resident larval sea lamprey metamorphose into juveniles and migrate from their larval stream habitats in fall through spring, but Diel timing of this migratory behavior is not well understood. Diel Activity was determined for newly metamorphosed sea lamprey using day/night net sampling and passive integrated transponder (PIT) telemetry in two natural streams and PIT telemetry in an artificial stream. Downstream migration was primarily nocturnal in all studies. All but one of 372 sea lamprey were captured during night sampling in the day/night net collections and all detections (N = 56) for the in-stream PIT telemetry occurred within a few hours after sunset. Most (81% of 48) tagged lamprey moved downstream during the first night following release and moved at speeds consistent with observed water velocities. During long-term observation of behavior in the artificial stream most sea lamprey movement occurred during the night with limited occurrence of movement during daylight hours. Understanding seasonal and Diel timing of downstream migration behavior may allow more effective management of sea lamprey for both conservation and control.
Thomas R Binder - One of the best experts on this subject based on the ideXlab platform.
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the role of temperature in controlling Diel Activity in upstream migrant sea lampreys petromyzon marinus
Canadian Journal of Fisheries and Aquatic Sciences, 2008Co-Authors: Thomas R Binder, Gordon D McdonaldAbstract:This study used controlled laboratory conditions to directly assess the role of temperature in controlling Diel Activity in sexually immature, upstream migrant sea lampreys (Petromyzon marinus). Our results identified three separate temperature-induced changes to the normal nocturnal Activity pattern of lampreys: (i) at low temperature (7 °C), lampreys became inactive; (ii) at high temperatures (≥20 °C), the normal nocturnal peak in Activity was reduced and lampreys became active during the day; and (iii) rapid increases in temperature (7 or 8 °C over 4 h) stimulated transient daytime Activity that subsided once temperature stabilized. In addition, we found evidence that temperature directly influences other aspects of sea lampreys behaviour, specifically light avoidance and rheotaxis. We propose that temperature-induced changes in Diel Activity represent adaptive behaviour, increasing the probability of lampreys reaching the spawning grounds within the narrow thermal range for successful embryonic develo...
Scott M. Miehls - One of the best experts on this subject based on the ideXlab platform.
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Diel Activity of newly metamorphosed juvenile sea lamprey petromyzon marinus
PLOS ONE, 2019Co-Authors: Scott M. Miehls, Christopher M Holbrook, Ellen J MarsdenAbstract:Timing of Activity, especially for juvenile anadromous fishes undertaking long migrations can be critical for survival. River-resident larval sea lamprey metamorphose into juveniles and migrate from their larval stream habitats in fall through spring, but Diel timing of this migratory behavior is not well understood. Diel Activity was determined for newly metamorphosed sea lamprey using day/night net sampling and passive integrated transponder (PIT) telemetry in two natural streams and PIT telemetry in an artificial stream. Downstream migration was primarily nocturnal in all studies. All but one of 372 sea lamprey were captured during night sampling in the day/night net collections and all detections (N = 56) for the in-stream PIT telemetry occurred within a few hours after sunset. Most (81% of 48) tagged lamprey moved downstream during the first night following release and moved at speeds consistent with observed water velocities. During long-term observation of behavior in the artificial stream most sea lamprey movement occurred during the night with limited occurrence of movement during daylight hours. Understanding seasonal and Diel timing of downstream migration behavior may allow more effective management of sea lamprey for both conservation and control.
Nicolas Larranaga - One of the best experts on this subject based on the ideXlab platform.
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Density-dependent Diel Activity in stream-dwelling Arctic charr Salvelinus alpinus.
Ecology and Evolution, 2016Co-Authors: Amy Fingerle, Nicolas Larranaga, Stefán Ó. SteingrímssonAbstract:: Intraspecific competition plays a significant role in shaping how animals use and share habitats in space and time. However, the way individuals may modify their Diel Activity in response to increased competition has received limited attention. We used juvenile (age 1+) Arctic charr Salvelinus alpinus to test the prediction that individuals at high population density are more active and distribute their foraging Activity over a greater portion of the 24-h cycle than individuals at low population density. Individually tagged fish were stocked in seminatural stream enclosures at low (2 fish/m(2)) and high (6 fish/m(2)) density. During each of two 2-week experimental rounds, Activity of all fish within each enclosure was recorded every 3 h over seven 24-h cycles. At high density, fish were more active and distributed their Activity over a greater portion of the 24-h cycle, with increased Activity particularly at crepuscular times. Fluctuations in ecological conditions (e.g., water temperature and light intensity) also affected Activity. Fish at high density grew as fast as fish at low density. This study demonstrates that individuals exhibit a degree of behavioral flexibility in their response to changes in ecological conditions and suggests that intraspecific competition can cause animals to modify temporal aspects of their Activity to gain access to resources and maintain growth.
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shelter availability alters Diel Activity and space use in a stream fish
Behavioral Ecology, 2015Co-Authors: Nicolas Larranaga, Stefán Ó. SteingrímssonAbstract:Shelters are a key component of animal population ecology, as they provide protection from predators and promote visual isolation among competitors. From a behavioral perspective, how shelter availability affects the way individuals allocate their Activity in space has been extensively documented. However, how shelters affect the distribution of Activity in time (i.e., Diel Activity) has been less studied in natural conditions. Here, we report results from a field study that used stream enclosures with either high or low shelter availability and stream-dwelling juvenile Arctic charr as a model species. We collected repeated measurements of individual Activity 8 times a day (every 3h) for six 24-h periods during a span of 9 days. In shelter-limited enclosures, fish were more active, became diurnal, and were active over a wider span of time each day, compared with fish with access to abundant shelters. In addition, fish were more aggregated and attacked prey over shorter distances and at lower rate when shelters were limited. Body mass did not affect individual Activity rates, but smaller individuals extended their Activity over longer periods, possibly as a result of interference competition, and were more isolated. Growth rates were similar across treatments and were positively correlated with individual Activity rates and the average distance to the nearest competitor. However, additional nonmeasured effects on fitness may occur, such as increased predation risk associated with daytime feeding and extended Activity in shelter-limited conditions.