Naslov
Mountain streams: Chuck Norris or Dejan Savićević?

Autori
Miliša, Marko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
The Book of Abstracts and Programme / Pešić, V ; Hadžiablahović, S - : Institute for Biodiversity and Ecology, 2017

ISBN
978-86-908743-7-8

Skup
7th International Symposium of Ecologists–ISEM7

Mjesto i datum
Sutomore, Crna Gora, 04.10.2017. - 07.10.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Quarry, siltation, stress, macroinvertebrates

Sažetak
Disturbances in nature are commonly caused by human activities. When mountain streams are in question, very few are as aggressive as obstructing the flow and contaminating the water. And quarrying does both. In this experiment we studied the effects of quarry-caused channel broadening and fine sediment input on benthic fauna of a typical Mountain stream in Medvednica mountain, Croatia. Abundances of non-insect macroinvertebrates was severely lowered downstream of the quarry. Diversity also decreased severely along the entire study reach. Insect fauna observed similar effects but they showed higher resilience as their numbers and diversity recovered some 3 km downstream of the quarry. However, the diversity and taxa balance was not fully recovered and Chironomidae dominated the assemblages downstream. When focusing on the most sensitive taxa (mayflies, stoneflies and caddisflies) the effect was overwhelming on both the late and early instars with more than ¾ loss. At the 3 km site they did recover to app ⅓ and ½ for abundances of early and late instars respectively in comparison with the control site. We found that siltation (covering the bed), significantly increased temperature and pH value and decreased oxygen content were the cause of these effects. Mountains streams are hence sensitive as a fine ‘fantasista’ in football in their immediate response but also very resilient as an action hero, especially since the surrounding mountain areas are always able to provide the sources of recovery.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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