Lake BESS is looking forward to going to the 100th Ecological Society of America (ESA) annual meeting in Baltimore! We have a talk scheduled Friday August 14th 2015 during the session “COS 142: Habitat Structure, Fragmentation, Connectivity”.
This is a very exciting opportunity to present our work asking the question: Does connectivity increase resilience of biodiversity against eutrophication in networks of shallow lakes? Our talk will be the only one focusing on freshwater in an collection of oral papers otherwise dedicated to ecological connectivity.
We will be using aquatic plant surveys conducted between 1983 and 2014 in our two study areas: The Broads, England, UK, and the Upper Lough Erne area, Northern Ireland, UK, and we will identify the relative importance of:
connectivity between lakes,
local water chemistry
and other factors
to explain the aquatic vegetation patters in the two lake districts during two time periods.
The comprehensive programme of the conference is available here online program and our abstract can be read there.
The Lake BESS team has just spent four full days on the water to collect bryozoans statoblasts from 14 different Norfolk broads. You will find more information about our work on bryozoans in this previous post.
The aim of this sampling is to gather evidence regarding how connectivity between lakes influences the movement of aquatic biodiversity, in particular bryozoan population genetics.
We were extremely privileged to be shown around by Geoff Philips, who greatly facilitated this field work with his knowledge of the area and of the people managing The Broads – at the Broads Authority, the Norfolk Wildlife trust, etc.
Last summer, we collected similar samples from the Upper Lough Erne region, Northern Ireland. With this trip in the Broads we completed the sampling of bryozoans for our project. We used an Ekman grab from our boat to retrieve lake surface sediment, i.e. oozy mud.
But collecting the mud is only the first step of the sampling. Back on the shore, our bryozoans expert Beth screened the sediments through a microscope to pick out individuals statoblasts (the dormant phase of bryozoans measuring less than 1 mm in diameter). These individual statoblasts are going to be sent off for their DNA to be extracted.
We are expecting to find out that isolated broads have bryozoans population with more distinct genetics than those from broads connected to the river systems. But we are really not sure how the gene flow within the Broads will compare with that experienced within the Upper Lough Erne region, so we are looking forward to get our results – and we are hope to be surprised!
Many thanks for the many people who helped making this sampling possible!
Lakes are inspirational places for people enjoying outdoor activities and they are cherished by local communities and holiday-makers alike. However, lake ecosystems are threatened by environmental change and loss of biodiversity that can have cascading and catastrophic effects.
The LakeBESS project, run from the Environmental Change Research Centre (ECRC) at UCL, is focussed on two lake districts, the Broads in East Anglia and the Upper Lough Erne district in Northern Ireland.
We are looking into how biodiversity regulates ecological balance within lakes and would like to assess the consequences of biodiversity loss for the provision of ecosystem services. Ecosystem services from lakes are extremely diverse: recreation, tourism, water purification, flood prevention, provision of fish for anglers and fisheries and other supporting services such as carbon storage for climate mitigation.
Because of this variety, changes in lake ecological functioning may affect the different services in different ways, rendering best practices for restoration and management difficult to establish.
One aspect we are particularly interested to develop in LakeBESS is the importance of ecological connectivity between lakes for their biodiversity. Connectivity may be a major factor determining lake ecosystem resilience because it counter-balances the negative effect of local extinction by increasing species re-colonisation.
Another aspect of interest is the consequences of biological invasions by organisms such as zebra mussel and Canadian pondweed.
We have just started this project as part of the Biodiveristy, Ecosystem Services and Sustainablility (BESS) research programme funded by the UK Natural Environment Research Council (NERC).
Our team is composed of Carl Sayer, Helen Bennion, Jorge Salgado and Ambroise Baker at UCL, Tom Davidson at the University of Aarhus (Denmark), Beth Okamura at the Natural History Museum and Nigel Willby at Stirling University. We are looking forward to a field campaign this summer and to presenting the result of our work to the numerous stakeholders in both lake districts.
We also would love to hear your take on how changes in lakes, or in a particular lake, can affect people’s lives.