[Mitarbeiter.zoologie] Online now in One Earth: A quarter of known bee species haven’t appeared in public records in over two decades

Mo Feb 22 09:46:42 CET 2021

dear julia,

i have now read the paper, although quickly.

the way i understand is that yes, what the authors assessed is whether species have detected or not. but they also provide arguments to justify that they have reasons to believe that, if a species is detecetd less, than this might be due to the fact that it became rarer: “We reasoned that if bees have been experiencing a global decline in the last few decades, then a generalized decrease in population size and range would result in increased rarity, diminished chance of observation and collection, and consequently, a diminished number of total species being observed and recorded worldwide each year.”.

they also say that they are aware of the biases implicit in their methods, but they discuss also how to deal with them: “This approach assumes that none of the artifactual trends caused by potential observation biases in the data are stronger than the real trends in bee diversity. Thus, we also assess the potential influence of some sources of bias and sug- gest how improving data collection and sharing could alleviate bias and reduce uncertainty.” Something they do in various part of the article, in relation to specific problems.

the fact that richness goes down, while number of overall records goes up, might indicate that decrease in richness is not due to the fact that people are less active collecting.

as mentioned, i have read it quickly. From what i have read I am overall convinced that what they found was real and not an artefact (or at least not completely). I have decided to be, at the moment, satisfied with it. But of course, if we are interested in going deeper in the merit of the methods they used to claim what they claim, then maybe one of our literature semins should be devoted to it.

ciao

antonella

> On 17. Feb 2021, at 17:48, Julia Osterman <jul.osterman at gmail.com> wrote:
> 
> Hi Antonella and all. 
> Just wanted to mention that it is Not exactly what is said in the study, I think, please correct me If I am wrong. Species richness measured per year declined by 25% since 1990 which does Not mean that 25% of the species were Not recorded at all since then. They are Not löst but might be Sampled less often. 
> Julia 
> 
> Antonella Soro <antonella.soro at zoologie.uni-halle.de <mailto:antonella.soro at zoologie.uni-halle.de>> schrieb am Mi., 17. Feb. 2021, 16:26:
> dear all,
> 
> just received the email below.
> 
> it might be of interest to many
> 
> ciao
> 
> a
> 
> 
>> Begin forwarded message:
>> 
>> From: "One Earth- Cell Press" <update at cellpress.email.elsevier.com <mailto:update at cellpress.email.elsevier.com>>
>> Subject: Online now in One Earth: A quarter of known bee species haven’t appeared in public records in over two decades
>> Date: 17. February 2021 at 15:52:40 CET
>> To: <antonella.soro at zoologie.uni-halle.de <mailto:antonella.soro at zoologie.uni-halle.de>>
>> Reply-To: "no-reply" <feedback at cell.com <mailto:feedback at cell.com>>
>> 
>> Can't see this email properly? Click here to view an online version <http://t.cellpress.email.elsevier.com/r/?id=hdf0d2bb%2Cd9bf2fd%2Cd3e33cd&utm_campaign=STMJ_130852_SC&utm_medium=email&utm_acid=77630403&SIS_ID=&dgcid=STMJ_130852_SC&CMX_ID=&utm_in=DM120643&utm_source=AC_&p1=%40MJH6rlcPw64XctD5w8gYAcRu6pCNchs5dCdgVWM7aWk%3D&s=HayKV1Dl4Bi0bPY5_jgpNPUoPXq6lsh--jtbDn9HbAg>
>>  <http://t.cellpress.email.elsevier.com/r/?id=hdf0d2bb%2Cd9bf2fd%2Cd3e33ce&utm_campaign=STMJ_130852_SC&utm_medium=email&utm_acid=77630403&SIS_ID=&dgcid=STMJ_130852_SC&CMX_ID=&utm_in=DM120643&utm_source=AC_&s=aTxSZ4kLz1DxAs4EiL_NFgkwksPH6NH8XrE0rC315bA>
>>  <http://t.cellpress.email.elsevier.com/r/?id=hdf0d2bb%2Cd9bf2fd%2Cd3e33cf&utm_campaign=STMJ_130852_SC&utm_medium=email&utm_acid=77630403&SIS_ID=&dgcid=STMJ_130852_SC&CMX_ID=&utm_in=DM120643&utm_source=AC_&s=Sm1_fdhgbRAs70RY05-3XLsl4v5toPGRccWcMr7vppQ>
>> 
>>  	This photo shows a giant Patagonian bumblebee (Bombus dahlbomii). Credit: Eduardo E. Zattara
>> Worldwide occurrence records suggest a global decline in bee species richness
>> 
>> There are over 20,000 species of wild bee, and they are fundamental to the reproduction of wild plant species and to the pollination of 85% of food crops. Decline in the abundance and diversity of bees is well established at the local level, but few large-scale, global analyses exist to assess the current state of bee diversity worldwide.
>> 
>> A study led by Eduardo E. Zattara from the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) in Argentina analyzed historical occurrence data from the Global Biodiversity Information Facility and found that since the 1990s, up to 25% of reported bee species are no longer being reported in global records. While this does not mean that these species are all extinct, it might indicate that these species have become rare enough that no one is observing them in nature.
>>  
>> Read the article <http://t.cellpress.email.elsevier.com/r/?id=hdf0d2bb%2Cd9bf2fd%2Cd3e33d0&utm_campaign=STMJ_130852_SC&utm_medium=email&utm_acid=77630403&SIS_ID=&dgcid=STMJ_130852_SC&CMX_ID=&utm_in=DM120643&utm_source=AC_&s=eTwDnUI25mmkz3l4HvBJxB9Ow9ce7a7C62T3eu_LdTg>
>>  
>>  	Check out the Q&A from the author, Eduardo E. Zattara, a biologist at the Pollination Ecology Group from the Institute for Research on Biodiversity and the Environment (CONICET-Universidad Nacional del Comahue). He also holds an appointment at the Smithsonian Institution, where he researches phylogeny and regeneration of ribbon worms, and in the Department of Biology at University of Indiana.
>> 
>> Why is assessing bee decline so important?
>> 
>> “We have to remember that ‘bee’ doesn't just mean honeybees, even though honeybees are the most cultivated species. Our society's footprint impacts wild bees as well, which provide ecosystem services we depend on. Something bad is happening to the bees, and something needs to be done. We cannot wait until we have absolute certainty because we rarely get there in natural sciences. The next step is prodding policymakers into action while we still have time. The bees cannot wait.”
>> 
>> What surprised you about your findings?
>> 
>> “With citizen science and the ability to share data, records are going up exponentially, but the number of species reported in these records has been going down steadily since the 1950s and then sharply since the 1990s. It’s not a bee cataclysm yet, but what we can say is that wild bees are not exactly thriving.”
>> 
>> What would your colleagues take away from this work?
>> 
>> “It's not really about how certain the numbers are here. It's more about the trend. It's about confirming what’s been shown to happen locally is going on globally. And about the fact that much better certainty will only be achieved as more data are shared with public databases.”
>>  
>> Read the article <http://t.cellpress.email.elsevier.com/r/?id=hdf0d2bb%2Cd9bf2fd%2Cd3e33d1&utm_campaign=STMJ_130852_SC&utm_medium=email&utm_acid=77630403&SIS_ID=&dgcid=STMJ_130852_SC&CMX_ID=&utm_in=DM120643&utm_source=AC_&s=Y3K5Ll4Zp9dz0HSxDZmSmXD2ftUE10tG603cgshSS3I>
>>  
>> Highlights from the study 
>> 
>> •	This is the first large-scale global analysis of bee diversity decline, contrasting with existing studies at the local level.
>> 
>> •	Analysis of public occurrence reports of over 20,000 bee species shows a steady decline in the number of reported species since the 1950s and a sharp decline since the 1990s.
>> 
>> •	Decline in number of reported species since the 1990s averaged at 25%. However, it was not evenly distributed among bee families, ranging from 17% for halictid bees to as high as 41% for family Melittidae.
>>  
>>  <http://t.cellpress.email.elsevier.com/r/?id=hdf0d2bb%2Cd9bf2fd%2Cd3e33d2&utm_campaign=STMJ_130852_SC&utm_medium=email&utm_acid=77630403&SIS_ID=&dgcid=STMJ_130852_SC&CMX_ID=&utm_in=DM120643&utm_source=AC_&s=tgqAuw5lQjIJgxhqzw3t4BaDH886KHujOgPYN7SIqJk>	One Earth is the home for high-quality research that seeks to understand and address today's environmental grand challenges, publishing research across the spectrum of environmental change and sustainability science. One Earth aspires to break down barriers between disciplines and stimulate the cross-pollination of ideas with a platform that unites communities, fosters dialogue, and encourages transformative research.
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