외래침입종이 자생종에 미치는 잠재적인 영향에 관하여 세계적인 관심이 증가하고 있음에도 그러한 침입의 결과들은 여전히 부족한 실정이다. 유럽좁쌀바구미(cabbage seedpod weevil, CSPW, Ceutorhynchus obstrictus)는 1990년대 초에 한반도에 침입하였다. 침입 후 20여 년 동안 관찰과 2010년 이후 중점적인 조사를 통해 유채 꽃에서 침입종인 유럽좁쌀바구미가 가장 우점을 이루고 있으며, 제주도와 울릉도를 포함한 남한 전역으로 확산되어 있다. 그의 확산은 자생종인 유채좁쌀바구미(rapseed weevil, RSW, C. albosuturalis)의 냉이 등 십자화과 잡초로 서식처 후퇴가 맞물려 일어나고 있다. 한편, 한반도와 제주도 사이에 위치한 여서도는 현재 그들의 비율이 약 1:1로 나타나고 있어 이 섬에는 유럽좁쌀바구미가 최근에 유입된 것으로 보인다. 자생종의 생태적 지위(ecological niche)가 외래침입종으로 대체되는 근본적인 기작은 확실하게 알 수 없 지만, 자원경쟁(exploitative competition)의 잠재적인 역할을 배제할 수는 없을 것이다. 자연생태계 내에서 외래침입종이 자생종을 신속하게 대체하고 있음을 확인한 이 결과는 앞으로 또 다른 외래종의 침입 방지 노력을 요구하고 있다.

Despite rising global concerns over the potential impacts of invasive alien species on indigenous species, the consequences of such introductions are lacking. The cabbage seedpod weevil (CSPW, C. obstrictus) was introduced into Korea in the early of 1990s. There was no genetic differences of COI sequences between populations of invasive CSPW, while was 1.1 % between populations of native rapeseed weevil (RSW, C. albosuturalis). It is tentatively considered that CSPW spread from once invasive population to the whole country. A large-scale survey in Korea reveals that, in about 20 years post-arrival, the invasive CSPW has become the most abundant on rape flowers and spread almost parts of South Korea including Is. Jeju and Is. Ulleung. Its spread is concurrent with the geographic retraction of the native RSW. However, Is. Yeoseo located between the mainland and Is. Jeju, was showed their ratio with 1:1. It suggests that the population of CSPW recently entered this island. Although the decline’s underlying mechanisms remain unknown, the potential roles of exploitative competition cannot be ruled out. Given that invasive weevil can rapidly replace native congeners, further introductions of other insect pests should be discouraged.

While the darkling beetle, Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae) is considered a pest of stored products, it does not pose a significant economic threat to this industry. The grains these beetles feed on are often already damaged. However, the beetle is considered the foremost premise pest in the poultry industry in many countries of the world. Recently, the darking beetle has also infested in broiler chicken houses of Korea. The problems caused by this pest are destroying their insulative capability, lowering chick’s overall performance and transmitting pathogenic organisms, and have been substantial economic losses to poultry producers. Therefore, we surveyed the status of infestation and damage of this pest in broiler chicken houses. Because there is no simple one step process that will completely eliminate darkling beetle populations from broiler facilities, we would like to outline further studies on the proper control measures.