시즌 2-21. 한국가재와 끈거머리지렁이의 공생

[이원영]

http://file.ssenhosting.com/data1/west210/24jan2016.mp3

위의 주소로 다운로드 받으실 수 있습니다~.

안녕하세요, 이원영입니다.

한동안 남극세종기지의 인터넷 연결이 잘 안되어서 업로드에 시간이 걸렸네요.

이틀째 강풍이 불고 있는데, 내일쯤부턴 좀 괜찮아질거라는 예보가 있어서 기다리고 있습니다.

펭귄새끼들은 이제 많이 컸어요. 

슬슬 둥지를 나와 새끼들끼리 모여서 공동유치원을 만들고 있습니다.

저도 이제 슬슬 한국에 갈 때가 되어 가네요.

지난회에 출연하셔서 말라리아 모기에 대해 말씀해주신 박경민 연구원을 다시 모시고 이번엔 가재에 대해 이야기를 해보았습니다.

저도 가재를 키웠던 경험이 있고, 박경민 연구원도 대학원에서 가재를 사육했던 적이 있다고 해서 가재에 관한 논문을 골라봤습니다.

가재를 많이 키우긴 했는데, 어떻게 키워야 할지도 잘 모르고 정보도 부족해서 오래 키우진 못했던 기억이 납니다.

2008년도에 Oecologia에서 나온 논문이구요, JH Lee, TW Kim, JC Choe 세분이 이화여대에 계실 때 하신 실험논문입니다. 가재에 붙어있는 끈거머리지렁이가 가재와 어떻게 공생관계를 이루면서 성장에 영향을 주는지에 대한 내용입니다.

논문의 pdf 파일은 저작권 문제도 있고 해서, 교신저자인 김태원 박사님 홈페이지에 나와 있는 링크만 걸어놓을께요.

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtYXJsb3Zlcjd8Z3g6MjhlMzAzMGExYmQ5YjllZQ

재밌게 들어주세요.^^

아래는 이번주 논문에 대한 김태원 박사님의 영문 설명입니다. (https://sites.google.com/site/marlover7/other-crustaceans/symbiosis-between-crayfish-and-branchiobdellids)

Symbiosis between crayfish and branchiobdellids

Nature of symbiosis between species could be regarded as mutualism, commensalism, and parasitism depending on cost and benefit of host and co-occuring species. Freshwater crayfish have tiny worms called branchiobdellids on their body coinhabiting for considerable amount of time. 

An undergrad student of Seoul National Univeristy, Juhyung Lee, and I were curious about the outcome of  interaction between freshwater crayfish Cambraroide similis and branchiobdellids. Branchiobdellids did not influence growth rate or morality when cultured under low fouling pressure. However, the growth rate of crafish with branchiobdellids significantly increasesd under higher fouling pressure. The interaction between crayfish and branchobdellids could shift from commensalism to mutualism when fouling pressure of water increases (Lee et al. 2009). This is the one of outstanding studies that have an implication that the outcome of symbiosis could change depending on the changing environments.  

 

 

   

아래는 원문 초록입니다.

Abstract

A growing body of evidence suggests that the costs and benefits involved in cleaning interactions can vary over space and time depending on the environmental conditions. However, whether the same cleaners actually induce variable net outcomes in terms of host fitness remains unclear to date. Branchiobdellid annelids are generally regarded as commensals or rarely parasites of their freshwater crayfish hosts, but a recent study suggests that they may also function as cleaning organisms. Under natural conditions, crayfish can experience fouling of the exposed surfaces of their exoskeletons and their gills (e.g., epibiosis) by various epibionts and particles of organic debris, and branchiobdellids graze on these sources of fouling. Here, we examined the extent to which variation in fouling pressure in the environment alters the outcome of the interaction between branchiobdellids and their crayfish host Cambaroide similis. A series of manipulations were performed in artificial environments designed to simulate either high or low fouling pressure. We used crayfish growth rates and mortality as direct measurements of the net costs and benefits of cleaning. Branchiobdellids had no significant effect on crayfish growth or mortality when cultured under low fouling pressure. However, their presence had a significant positive impact on host growth rates when cultured under high fouling pressure. These results suggest that the relationship between crayfish and branchiobdellids can fluctuate between commensalism and mutualism depending mainly on the environmental fouling pressure. We hypothesize that the outcome of cleaning interactions may largely depend on the factors directly related to the need for cleaning, such as parasite loads or fouling pressure.

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