Featured Research

from universities, journals, and other organizations

Increased Irrigation In Wetland Linked To Reduction Of Tenebrionid Beetles

Date:
November 27, 2008
Source:
Plataforma SINC
Summary:
Hydrological changes over the past 24 years in the Mar Menor, including increased irrigation, are altering habitats and biological communities of the wetland area. Researchers have studied tenebrionid beetles and how their numbers have declined as a result of increased ground moisture and salinity.

Two of the most unusual species of carabid beetles from the Marina del Carmolí (Mar Menor).
Credit: Illustration: Julia Martínez

Hydrological changes over the past 24 years in the Mar Menor, including increased irrigation, are altering habitats and biological communities of the wetland area. Researchers from the University of Murcia and the Miguel Hernández University have studied tenebrionid beetles and how their numbers have declined as a result of increased ground moisture and salinity.

Researchers from Murcia and Alicante studied coleopterae (specifically carabid and tenebrionid beetles) in areas close to the Mar Menor from 1984 to 2003. Their research analysed changes in the species’ functional activity and structure, as well as in their response to changes in moisture and salinity levels in the coastal wetland area of Marina del Carmolí.

“The ecology and biodiversity of the hypersaline lagoon of the Mar Menor and its coastal wetlands are under threat from hydrological alterations caused by changes in land use within the basin, in particular increased irrigation,” SINC was told by Julia Martínez Fernández, a researcher from the University of Murcia’s Observatory on Sustainability in the Murcia Region.

In order to test the effects of irrigation, precipitation and the discontinuance of agriculture on these insects, the researchers took samples in 1984, 1992 and 2003. The results, published in the most recent issue of the Journal of Arid Environments, show that rises in the water table, increases in the length of periods during which the land is below water and of ground moisture levels have led to a decline in the abundance of tenebrionid beetles.

These beetles were used by the researchers as bio-indicators for arid systems. Tenebrionid beetles are a key link in the trophic chain of these ecosystems since they form the main foodstuff of numerous reptiles and birds. They were affected by the increase in ground moisture levels since they are better suited to semi-arid environments where they fulfil an important function as recyclers and “mobilisers of matter and energy in systems where microbial action is restricted”.

Changes in the make-up of species

Changes in hydrology and agricultural practices have led to an increase in carabid beetles, however, through the appearance of halophile (salinity tolerant) plants and halobiont plants, which grow in salty soils and only rarely in other locations, within the wetland area. Such plants were virtually absent between 1984 and 1992.

“The combination of the results obtained suggests that changing long-term trends in the water table and moisture conditions within the wetland are reflected by changes in the make-up of species,” said Martínez. The researcher added that the biggest impact on the wealth and diversity of species is due to “increases in moisture levels resulting from exceptionally rainy years, as well as successive changes derived from the discontinuance of farming”.

The changes being experienced within animal populations cannot be explained by variations in moisture or salinity alone, however. According to the researcher, the multi-faceted analysis revealed changes such as the existence of three groups of species. “The first of these are associated with more arid conditions (tenebrionids), the second are linked to greater homogeneity of moisture and salinity (carabids), and the third group is characterised by halobiont and halophile species, which are associated with permanently saline soils resulting from long-term changes in the water table.”

The appearance of this last group of salinity-tolerant plants has led to the introduction of species that are characteristic of unstable environments. The populations of animals that were to be found in 1984 were “species more typical of more stable environments”, said Martínez. She added that the increase in water from irrigation “is leading to a decline in the value of the habitats and in the uniqueness of the coastal wetlands of the Mar Menor, which make up protected areas that are even included in the Red Natura 2000 (network of natural areas of special environmental interest)”.

This study is part of a wider research programme looking into changes in the Mar Menor wetlands caused by changes in use of the basin, and their environmental implications.

 


Story Source:

The above story is based on materials provided by Plataforma SINC. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pardo et al. Assessment of hydrological alterations on wandering beetle assemblages (coleoptera: Carabidae and Tenebrionidae) in coastal wetlands of arid Mediterranean systems. Journal of Arid Environments, 2008; 72 (10): 1803 DOI: 10.1016/j.jaridenv.2008.05.005

Cite This Page:

Plataforma SINC. "Increased Irrigation In Wetland Linked To Reduction Of Tenebrionid Beetles." ScienceDaily. ScienceDaily, 27 November 2008. <www.sciencedaily.com/releases/2008/11/081114134952.htm>.
Plataforma SINC. (2008, November 27). Increased Irrigation In Wetland Linked To Reduction Of Tenebrionid Beetles. ScienceDaily. Retrieved April 25, 2014 from www.sciencedaily.com/releases/2008/11/081114134952.htm
Plataforma SINC. "Increased Irrigation In Wetland Linked To Reduction Of Tenebrionid Beetles." ScienceDaily. www.sciencedaily.com/releases/2008/11/081114134952.htm (accessed April 25, 2014).

Share This



More Plants & Animals News

Friday, April 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Fungus Killing Bats, Spreading in US

Deadly Fungus Killing Bats, Spreading in US

AP (Apr. 24, 2014) — A disease that has killed more than six million cave-dwelling bats in the United States is on the move and wildlife biologists are worried. White Nose Syndrome, discovered in New York in 2006, has now spread to 25 states. (April 24) Video provided by AP
Powered by NewsLook.com
Blood From World's Oldest Woman Suggests Life Limit

Blood From World's Oldest Woman Suggests Life Limit

Newsy (Apr. 24, 2014) — Scientists say for the extremely elderly, their stem cells might reach a state of exhaustion. This could limit one's life span. Video provided by Newsy
Powered by NewsLook.com
Raw: Kangaroo Rescued from Swimming Pool

Raw: Kangaroo Rescued from Swimming Pool

AP (Apr. 24, 2014) — A kangaroo was saved from drowning in a backyard suburban swimming pool in Australia's Victoria state on Thursday. Australian broadcaster Channel 7 showed footage of the kangaroo struggling to get out of the pool. (April 24) Video provided by AP
Powered by NewsLook.com
Could Marijuana Use Lead To Serious Heart Problems?

Could Marijuana Use Lead To Serious Heart Problems?

Newsy (Apr. 24, 2014) — A new study says marijuana use could lead to serious heart-related complications. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins