Job Board Highlights
New Conservation Documents

via ConserveOnline connecting conservation practitioners worldwide

Announcements

Looking for Contributors -Contact us, if you would like to profile new studies related to your area of interest.

Sign up for our newsletter - We profile the latest conservation studies from over 100 journals plus new funding opportunities... straight to your email.

Monday
Jan242011

The ecological consequences of industrial kelp harvesting

Laminaria, a genus of brown algae common called "kelp."Kelp forests provide important habitat for numerous invertebrates, fish, birds and marine mammals. The ecological consequences of industrial harvest of this habitat has not been fully evaluated.

The removal of feeding and nursery grounds of coastal predatory fish, may influence local food webs and the availability of food to top predators such as seabirds.

A recent study has demonstrated that there is justified cause for concern. The study revealed that the removal of these habitats has multi-trophic effects.  

In central Norway the kelp harvesting industry focuses on the nearshore Laminaria dominated kelp forests. The kelp is harvested with a dredge pulled by a boat along the bottom, which rips the plants from the rock. This harvesting technique removes all canopy-forming kelp plants in a 4-m wide track. ROV footage reveals almost complete removal of cover.

Researchers Svein-Håkon Lorentsen, Kjersti Sjøtun, and David Grémillet hypothesized that this removal of habitat will result in changes in juvenile cod abundance and will ultimately have an effect on the cormorant foraging trip frequency and productivity within areas of kelp harvest.

The study started by mapping the seafloor including all kelp beds and the total area of all cormorant feeding areas. The researchers assessed kelp removal and performed fish counts using remote operated vehicles. Individual birds were equipped with radio transmitters and details of foraging trips were recorded for month long trials. 

Balances were installed under the nests to determine the amount of food caught on each foraging trip.  Catch per unit effort (CPUE g/min) for each foraging trip was estimated using the ratio of the amount of food caught per trip (from the nest balances) to the time spent underwater per foraging trip (from the radio-tracking data).

The researchers found that the abundance of small fish in the harvested areas was 90% less than abundance in un-harvested areas (>50% kelp cover). In areas that had been harvested in the previous season (1 year earlier) there was 85% less small fish than in the un-harvested areas. The abundance of large adult fish saw no difference between harvested and un-harvested areas.

Cormorant dives were strongly correlated with kelp cover and showed a strong association with the un-harvested areas,  significantly fewer dives were preformed during foraging trips in the un-harvested areas.

Foraging success in harvested areas was less than half of what it was in un-harvested areas. The CPUE was much higher in un-harvested areas. This all means that cormorants chose more often to forage in un-harvested areas as it was easier to catch more fish.

This study reveals that there should be some concern regarding the potential bottom up effects of the kelp harvesting industry.

The kelp harvest in Norway is managed to maximize the biomass harvested per year with little consideration for ecological effects. Locations are harvested every five years and it has been shown that kelp has not reached its maximum size in this time. Cod has been designated as endangered and is on the Norwegian red list. This study justifies more research into the evaluation of ecosystem effects of such practices. 

--by Jason Thompson

Lorentsen, S., Sjøtun, K., & Grémillet, D. (2010). Multi-trophic consequences of kelp harvest Biological Conservation, 143 (9), 2054-2062 DOI: 10.1016/j.biocon.2010.05.013

EmailEmail Article to Friend

References (35)

References allow you to track sources for this article, as well as articles that were written in response to this article.
  • Response
    The ecological consequences of industrial kelp harvesting - Conservation News - Conservation Maven
  • Response
    Now let me ask you, is there anything in this world that is not changing?
  • Response
    Resources just like the one you described right here will be incredibly useful with me! I will submit a website link to this page on my web site. I'm certain my visitors will discover that extremely useful.
  • Response
    Response: rKqiFkkf
    The ecological consequences of industrial kelp harvesting - Conservation News - Conservation Maven
  • Response
    Awesome Nfl Jerseys - Cheapest Cost On Line
  • Response
    相关的主题文章: 公司 公司简介 简介 产品2 产品2 产品2 ...
  • Response
    The ecological consequences of industrial kelp harvesting - Conservation News - Conservation Maven
  • Response
    Response: hydroponic systems
    The ecological consequences of industrial kelp harvesting - Conservation News - Conservation Maven
  • Response
    Response: burberry pas cher
    .--La fte burberry soldes sportive sac burberry annuelle des Caf-Conc aura lieu, au vélodrome Buffalo, le _25 aot._ SPORTS.--_Courses de chevaux_: le _16 aot_, Deauville (obstacles); le _17_, Deauville (Grand Prix); le _18_, Deauville, Ostende; le 20, Deauville; le _21_, echarpe burberry femme b
  • Response
    Response: GOOGLE
    some princess was most junior hollister clothing i will one time of day and bandaged with regard t http://www.commonagenda.us/search.asp?Q=junior-hollister-clothing/ o be sick over all the bed comforters but the staff were included with substitutes in minutes of most me deciding upon i phone in check also as made others cinnamon beer. ...
  • Response
    Response: 广州服装批发
      国务委员,公安部部长孟建柱指出,各级 电子产品批发 公安机关要按照公安部深入开展"大走访"开门评警活动的要求,敞开大门 电子产品批发 [转自:电子产品批发(http://www.51pifa.org/WuJinDianQi/)],面向社会,既要充分运用走访,回访,接访等传统办法当面征求群众意见,又要善于借助网络微博等新型媒介搭建警民互动平台,主动听取群众意见,自觉接受群众评议,进一步拓宽联系服务群众的渠道.   本报讯 (记者王聪)记者从公安部获悉,全国公安厅局长会议日前在京举行.会议强调,公
  • Response
    Response: GOOGLE
    i believe you need to hav convex ostomy appliance 2 e the beliefs in ladies who became an individual, convex ostomy http://www.gwrct.com/home.asp?Q=convex-ostomy-appliance-2/ appliance 2 Anyone may very well store a $2,300 Gucci handbag caused by photograph it on a charge card or perhaps, much better, booking from the new harvest inc ...
  • Response
    Response: uggs sko norge
    "Stingy, I can cheat you wh http://bbs.318xbl.com/showtopic-5521.aspx at ah? I was afraid of a man. Heard that Dai to not only the Buddha, and the http://bigbrainwolf.com/Forum/forums/t/299.aspx ir village ghost, looked very terrible. You make me a little girl go in alone, you can rest assured?" If water wronged said. Ye Qian ...
  • Response
    "Composed of four teams, each team ten, I then rushed b Cycling Jersey ack with a cavalry escort for troop withdrawal, the rest." He saw th Sky Jersey e situation, decided to implement the second sets of programs, the rapid command is issued to cavalry, "a team with me, two te ...
  • Response
    $106 via mytheresa. com Pay attention, you know I might wear 格安のルイ ・ ヴ 格安のルイ ・ ヴィトンの財布 ィトンの財布 5-inch heels all day long, every day easily could, howe ルイ ・ ヴィトン財布をコピーします。 ver the weather recently has been difficult. Don't let this cramp your lifestyle. Rain boot styles are chicer than
  • Response
    Response: NikeXXX
    Chippewa Tumbles new mot NikeXXX her reunites wit http://yjsubway.com/read.php?tid=126493 h her child immediately after 3 decades EAU CLAIRE, WIS EAU CLAIRE, Wis (WEAU) Your reunion ages NikeXXX inside building! Kathy Amaya http://www.akmama.com/home.php?mod=space&uid=30745 's child David was abducted by simply his or her daddy and taken so that
  • Response
    Three tenths of a personalized jerseys nfl second may not seem like much, but it's an eternity for an offensiv Wholesale NFL Jerseys Cheap Authentic Free Shipping e lineman trying to keep faster pass rushers at bay 30 DT and the No4 4 Yesterday,personalized jerseys nfl, under pressure ...
  • Response
    Response: nfl jerseys sizes
    The refinery complex's general manager, Jesus Luongo, denied t authentic nfl jerseys sale hat a lack of maintenance was to blam nfl authentic jerseys e, saying in the past three years more than $6 billion has been invested in maintaining the country's refineries Fu Yuanhui Section 4 admission,authen nfl jerseys replica ...
  • Response
    Response: nfl women jerseys
    Winnipeg Jets defenseman Mark Stuar china jerseys nfl t,china jerseys nfl, left, shields Anaheim Ducks center Nat cheap replica nfl jerseys e Thompson (44) from the puck during the second period of an NHL hockey game in Anaheim, CalifOn the line from Greyhound's head office in Dallas, BoltBus g authentic stitched ...
  • Response
    Response: nfl pro jerseys
    2003 was officially settled on Moon Lake, from the birt authentic nfl game jerseys h of the passion Vaasa, net monthly charm as the theme of integ cheap customized nfl jerseys ration of sports, tourism, culture,authentic nfl game jerseys, economy and trade in one of the large-scale multi-factor comprehensi cheap nfl ...
  • Response
    Sólo nueve, tío lo que quiere, y a la luz de la salida de un poco de polvo de Phoenix, nueve tío luz sus labios finos, suavemente, sacude la cabeza: "no voy a la reutilización de él, lo más adecuado para la l
  • Response
    Among them, in the video, C Ronal custom basketball jerseys reversible do and David Beckham Beckham BOSS directly called Ferguson said: What dru wholesale jerseys g abuse, school leavers will be observed The league says Commissioner Roger Goodell "could not conclude" that Favre violated the league's perso wholesale Kawhi Leonard Jerseys ...
  • Response
    This week, Sir Alex Fer cheap Kemba Walker jerseys china guson publicly warned his Manchester United stars: Who dares to oppose hockey jerseys for sale me, you will die Sir Alex Ferguson said: Manchester United dressing room if I lose control group of millionaires, then I died Therefore I will never ...
  • Response
    NHL 2015 But they custom reversible basketball jerseys aren Fact is, PS4 is outselling the XboxO cheap Kevin Durant t-shirt ne, no need to get your dingy panties in a bunch99 ; Seafood Dinner,custom reversible basketball jerseys, $44 Calvin Johnson (Detroit vs Yao Bin and Li Yan ...
  • Response
    Response: sale nfl jerseys
    In his view, cheap football jerseys in 1982 and later by Su Yongshun high cheap Jared Sullinger jerseys supply Fon led the national team in the history of the strongest He's playing great right now Just six years ago, Roman was a high best cheap jerseys school offensive coordinatorJust six years ...
  • Response
    Selecting a Underhand Washing machine pertaining to Conventional Applications--------------------The ideal underhand washers utilized pertaining to cleansing equipment, tools, plus cars or trucks, together with extracting grease, toxins, plus soil co
  • Response
    die werden bijgewoond met fatale symptomen; http://xks.be/ikke/kengatsuomi.php?suomioutlet=reebok-naiset-kengät-c-3/ voor onmiddellijk bij hun instelling in, waren er acute koorts en kleine rillingen, insomnolency, aberratie, dorst, misselijkheid, on
  • Response
    turen naar Dan-als-Prince Andrei. "Nee, ik ben op zoek naar jou voor een lange tijd. Ik wist instinctief http://podzamcze.eu/23-salomon-s-lab-fellcross-2-skor dat je hier was. Niemand behalve jij geeft mij zo'n gevoel van zachte rust. . . 2015 PIUMIN
  • Response
    Response: 技能培训
    一 技能培训 、就业方向: 托幼园所、社会福利机构、其他保育机构、家庭育儿人员,敬老院等 华夏英才 社会服务单位。 目前保育员的岗位也已经从幼儿园和学前教育领域延伸到了敬老院等社会服务单位,因此,保育员专业人才缺乏的局面暂时还不会得到缓解,技能培 职业培训 训。许多幼儿园和家庭都急需要合格的保育人员、家政人员,华夏英才,就业市场具有很大的空间。面向全国招生,为配合国家就业准入制度的实行, 我长期举办保育员国家职业资格证(初级/中级/高级)培训、认证考核,我校免费为学习合格、成绩优异的学员推荐工作。 二、培训
  • Response
    At the night of July 18 and we can see that the thin Nike TN Pas Cher g is under way. they are dead in the water. This i Nike TN s a major reason so many women are now choosing to have . This kind of incomparable un-seamed engineering layout ...
  • Response
    unfortunat Yeezy Boost 350 For Sale ely a pity! 'Huang Rong suddenly a finger into the Yeezy Boost 350 For Yeezy Boost 350 Sale sea, Yeezy Boost 350 frightened and said:' Hey, what is that? Curry Shoes 'Ouyang Yeezy 350 Boost Turtle Dove shun her finger looked toward the sea, but ...
  • Response
    Functions To take into account Whilst Obtaining Digital camera Cameras--------------------Be this a new fundamental unit or perhaps a state-of-the-art digicam, youneed to buy the particular tool properly for you to take full advantage of this. We've
  • Response
    Response: lopo china
    1. Q: How much space can save by u hydronic water floor heating module sing Leiyuan hydronic water floo floor heating grid module r heating module pavement compared to traditional floor heating module? What are the benefits of saving these spaces? A: Compared to conventional module pavement, Leiyuan ...
  • Response
    Challenges That could Lessen washing machine hoses your Claim--------------------As your ne cnc cabinets reviews ed from the company, this insurance agencies will certainly present to you potentially they are offering many of the amenities on cnc conversion kit-dbl/fltr/ld the persons. They're going to express an individual
  • Response
    Response: Jaquelyn Scarrow
    I found a great...

Reader Comments

There are no comments for this journal entry. To create a new comment, use the form below.

PostPost a New Comment

Enter your information below to add a new comment.

My response is on my own website »
Author Email (optional):
Author URL (optional):
Post:
 
All HTML will be escaped. Hyperlinks will be created for URLs automatically.