Objective:To determine growth and reproduction biology of Philocheras trispinosus(P.trispinosus)with abundance of other caridean shrimps caught by beam trawl in the Southern Black Sea.Methods:Samplings were carried ou...Objective:To determine growth and reproduction biology of Philocheras trispinosus(P.trispinosus)with abundance of other caridean shrimps caught by beam trawl in the Southern Black Sea.Methods:Samplings were carried out monthly with a beam trawl of 2 m length and 15 mm cod-end mesh size between December 2012 and November 2013.All individuals were sampled between 1 and 40+m water depth from 146 hauls.Results:A total of 550 P.trispinosus,618 Palaemon adspersus,12 Palaemon serratus,11 Philocheras fasciatus and 10 Crangon crangon were sampled during the study period.The crangonid shrimps started appearing during the winter and spring and the number of individuals increased to reach their highest value in mid-winter and mid-spring.The seasonal von Bertalanffy growth parameters for P.trispinosus were estimated as L_(∞)=29.3 mm total length,K=0.860/year,t_(0)=–0.900 year,C=0.180,and t_(s)=0.010.The start of the slow growth period was at the beginning of July(WP=0.510).Ovigerous females appeared in the sampling area between January and April.Size at sexual maturity was estimated as 25.69 mm total length.Conclusions:The results supported the distribution and abundance of caridean shrimp species from the study area and the population dynamics of the most abundant shrimp species,P.trispinosus.The current study can be answered as baseline data prior to management strategies to ensure sustainable conservation of the shrimp species.展开更多
An increase in ecotourism adversely impacts many animals and contributes to biodiversity loss.To mitigate these impacts,we illustrate the application of a conservation behavior framework toward the development of a su...An increase in ecotourism adversely impacts many animals and contributes to biodiversity loss.To mitigate these impacts,we illustrate the application of a conservation behavior framework toward the development of a sustainable ecotourism management plan.In Ubon Ratchathani,Thailand,thousands of tourists annually come to see a unique mass migration of shrimps on land(referred to as"shrimp parading").Preliminary work suggests that this tourism has negatively impacted the shrimps.To reduce tourism-related impacts we studied:1)the decisions shrimps make when parading and 2)how shrimps respond to different light intensities and colors.We created an artificial stream and tested the conditions that influence parading by experimentally varying the presence of light and systematically manipulating water velocity(10,60,and 100cm/s).Additionally,we conducted an in situ experiment to study how shrimps respond to tourists'lights under three intensities(50,400,and 9,000 lux)and five colors(white,blue,green,orange,and red).We found most shrimps prefer to leave the river when it is dark and there is low water flow.Shrimps responded the least to red (λmax=630 nm>and orange(λmax=625 nm)light at 50 lux.These findings were used to develop a management plan by creating three different tourist zones,which maximize tourist needs and minimize the anthropogenic impacts on the shrimps.This work could be used as an example of the application of conservation behavior framework in developing management plan for sustainable ecotourism for other invertebrate taxa.展开更多
基金Supported by Recep Tayyip Erdoğan University with project number 2013.103.03.01.
文摘Objective:To determine growth and reproduction biology of Philocheras trispinosus(P.trispinosus)with abundance of other caridean shrimps caught by beam trawl in the Southern Black Sea.Methods:Samplings were carried out monthly with a beam trawl of 2 m length and 15 mm cod-end mesh size between December 2012 and November 2013.All individuals were sampled between 1 and 40+m water depth from 146 hauls.Results:A total of 550 P.trispinosus,618 Palaemon adspersus,12 Palaemon serratus,11 Philocheras fasciatus and 10 Crangon crangon were sampled during the study period.The crangonid shrimps started appearing during the winter and spring and the number of individuals increased to reach their highest value in mid-winter and mid-spring.The seasonal von Bertalanffy growth parameters for P.trispinosus were estimated as L_(∞)=29.3 mm total length,K=0.860/year,t_(0)=–0.900 year,C=0.180,and t_(s)=0.010.The start of the slow growth period was at the beginning of July(WP=0.510).Ovigerous females appeared in the sampling area between January and April.Size at sexual maturity was estimated as 25.69 mm total length.Conclusions:The results supported the distribution and abundance of caridean shrimp species from the study area and the population dynamics of the most abundant shrimp species,P.trispinosus.The current study can be answered as baseline data prior to management strategies to ensure sustainable conservation of the shrimp species.
基金This research was supported by the Department of Ecology and Evolutionary Biology at UCLA,Sigma Xi Grants-in-Aid of Research(GIAR)donation from Mr.Rerngchai Hongjamrassilp.
文摘An increase in ecotourism adversely impacts many animals and contributes to biodiversity loss.To mitigate these impacts,we illustrate the application of a conservation behavior framework toward the development of a sustainable ecotourism management plan.In Ubon Ratchathani,Thailand,thousands of tourists annually come to see a unique mass migration of shrimps on land(referred to as"shrimp parading").Preliminary work suggests that this tourism has negatively impacted the shrimps.To reduce tourism-related impacts we studied:1)the decisions shrimps make when parading and 2)how shrimps respond to different light intensities and colors.We created an artificial stream and tested the conditions that influence parading by experimentally varying the presence of light and systematically manipulating water velocity(10,60,and 100cm/s).Additionally,we conducted an in situ experiment to study how shrimps respond to tourists'lights under three intensities(50,400,and 9,000 lux)and five colors(white,blue,green,orange,and red).We found most shrimps prefer to leave the river when it is dark and there is low water flow.Shrimps responded the least to red (λmax=630 nm>and orange(λmax=625 nm)light at 50 lux.These findings were used to develop a management plan by creating three different tourist zones,which maximize tourist needs and minimize the anthropogenic impacts on the shrimps.This work could be used as an example of the application of conservation behavior framework in developing management plan for sustainable ecotourism for other invertebrate taxa.
