Bridging research and practice in conservation

Abstract Calls for biodiversity conservation practice to be more evidence based are growing, and we agree evidence use in conservation practice needs improvement. However, evidence‐based conservation will not be realized without improved access to evidence. In medicine, unlike in conservation, a well‐established and well‐funded layer of intermediary individuals and organizations engage with medical practitioners, synthesize primary research relevant to decision making, and make evidence easily accessible. These intermediaries prepare targeted evidence summaries and distribute them to practitioners faced with time‐sensitive and value‐laden decisions. To be effective, these intermediaries, who we refer to as evidence bridges, should identify research topics based on the priorities of practitioners; synthesize evidence; prepare and distribute easy‐to‐find and easy‐to‐use evidence summaries; and develop and maintain networks of connections with researchers and practitioners. Based on a review of the literature regarding evidence intermediaries in conservation and environmental management, as well as an anonymous questionnaire searching for such organizations, we found few intermediaries that met all these criteria. Few evidence bridges that do exist are unable to reach most conservation practitioners, which include resource managers in government and industry, conservation organizations, and farmers and other private landowners. We argue that the lack of evidence bridges from research to practitioners contributes to evidence complacency and limits the use of evidence in conservation action. Nevertheless, several existing organizations help reduce the gap between evidence and practice and could serve as a foundation for building additional components of evidence bridges in conservation. Although evidence bridges need expertise in research and evidence synthesis, they also require expertise in identifying and communicating with the community of practitioners most in need of clear and concise syntheses of evidence. Article Impact Statement: Evidence‐based conservation will not be realized without improved access to evidence. We call for intermediary evidence bridges.

de individuos y organizaciones intermediarias interactúan con los médicos, sintetizan las investigaciones primarias relevantes para la toma de decisiones y hacen que las evidencias sean de fácil acceso. Estos intermediarios preparan resúmenes de evidencias específicas y los distribuyen a los médicos que enfrentan decisiones urgentes y muy valiosas. Para que sean efectivos, estos intermediarios, a quienes nos referimos como puentes de evidencias, deben poder identificar los temas de estudio con base en las prioridades de los practicantes, sintetizar evidencias, preparar y distribuir resúmenes fáciles de encontrar y fáciles de usar, y desarrollar y mantener redes de conexiones con los investigadores y los practicantes. Con base en una revisión de la literatura correspondiente a los intermediarios de evidencias en la conservación y el manejo ambiental, así como en un cuestionario anónimo que busca a dichas organizaciones, encontramos a pocos intermediarios que cumplieran con estos criterios. Los pocos puentes de evidencias que existen no son capaces de llegar a la mayoría de los practicantes de la conservación, los cuales incluyen a los gestores de recursos en el gobierno y en la industria, a las organizaciones de conservación y a los agricultores y otros terratenientes privados. Argumentamos que la falta de puentes de evidencia entre los investigadores y los practicantes contribuye a la indulgencia de evidencias y limita el uso de evidencias en las acciones de conservación. Sin embargo, varias organizaciones existentes ayudan a reducir la brecha entre la evidencia y la práctica y podrían funcionar como base para la construcción de componentes adicionales para los puentes de evidencia en la conservación. Aunque los puentes de evidencias necesitan experiencia con la investigación y con la síntesis de evidencias, también requieren experiencia con la identificación de y comunicación con la comunidad de practicantes que más necesitan una síntesis clara y concisa de la evidencia. Salafsky et al. (2019) added their voices to a growing call for biodiversity conservation and environmental management (here-after conservation) to be more evidence-based (Nguyen et al., 2017;Pullin, 2012;Pullin & Knight, 2001;Pullin & Knight, 2003;Sutherland et al., 2004). Although we agree with Salafsky et al. (2019) that evaluation and use of evidence in conservation practice can be improved, evidence-based conservation cannot be realized without also improving awareness of and access to centralized, user-friendly syntheses of evidence. By evidence, we mean scientifically generated relevant information or knowledge used to assess hypotheses related to a question of interest (Salafsky et al., 2019). We suggest that easy access to user-friendly evidence is rare in conservation, contributing to knowledge-action gaps in which the available science is not widely used (Appendix S1). A lack of accessible evidence can lead to "evidence complacency" in which, despite the availability of evidence, it is not sought or used to make conservation decisions (Sutherland & Wordley, 2017). Salafsky et al. (2019) contrast decision making in conservation with decision making in medicine, arguing that in medicine, decisions are more strongly grounded in evidence. They suggest that this difference is largely because medicine is a more mature discipline, with well-defined situations, whereas conservation involves complex and messy situations. We agree that these are important factors, but here, we highlight an additional critical difference:--medicine has a well-established and well-funded layer of intermediary individuals and organizations that synthesize primary research and make it easily accessible to medical practitioners in ways that support time-sensitive decisions. These intermediaries prepare evidence summaries and syntheses, and distribute them in an appropriate manner to inform practitioners' decisions, thus facilitating direct access to evidence (see Figure 4 in Salafsky et al. [2019]). Hence, they form a bridge linking research conducted by scientists to the practitioners who need information to improve their actions (Haynes et al., 1995;Lomas, 1997b;Lomas, 2007). In the health professions, these intermediaries are known as knowledge translators.

INTRODUCTION
We included all knowledge translation professionals and activities under the term evidence bridges and suggest that these are generally absent or insufficient in conservation. We considered the need for widely recognized and easily accessible evidence bridges so that conservation practitioners can make timely and informed decisions about possible actions on the ground. In our view, conservation practitioners are analogous to medical practitioners and include resource managers in government or industry, conservation organizations, consultants, and farmers and other private landowners.
We examined the current use of evidence and major barriers to the use of that evidence in conservation; reviewed the key elements of knowledge translation and exchange in medicine and conservation; defined the key roles and properties required to form effective evidence bridges in conservation; contrasted evidence bridges with organizations that synthesize conservation evidence but are not fully formed, stand-alone evidence bridges; reviewed existing organizations that partially fulfill the role of evidence bridges in conservation and what they could do to become full evidence bridges; reviewed the roles of researchers and practitioners and why neither group is well equipped to form evidence bridges; examined the role of values in conservation decisions; and devised a model for how evidence bridges could be funded and how a possible college for conservation decision making could be the basis of a professional community to support evidence-based conservation.

CURRENT USE OF EVIDENCE IN CONSERVATION AND MAJOR BARRIERS
To examine the current status of evidence use in conservation, we reviewed the scientific literature for studies that used surveys or interviews to understand how conservation practitioners use evidence (Table 1; methods in Appendix S2). We found 19 relevant studies that, taken together, suggest that evidence, especially peer-reviewed science, is rarely the first or most widely used or the most valued source of knowledge or information considered in conservation decisions. The available studies were primarily limited to interviews of resource managers. Other kinds of practitioners, such as farmers and other private landowners, may access and use evidence differently in conservation decision making.
Decision-makers relied heavily on judgment and experience, including personal experience, anecdotes, and personal contacts with colleagues and experts--without clear links to evidence (Table 1). When evidence existed, it was often not in a form suitable for use by practitioners (Table 1). Using the typology developed by Walsh et al. (2019), we found the most common barriers to use of scientific evidence were accessibility of the evidence (12 studies); relevance and applicability of the evidence (4 studies); organizational capacity, resources, and finances (4 studies); time required to find and read evidence (3 studies); and researcher communication and dissemination skills (3 studies).
Several studies, through interviews with conservation practitioners, documented the need to identify and engage effective intermediaries to improve the exchange of evidence (Cvitanovic et al., 2016;Nguyen et al., 2018;Reed et al., 2014).

KNOWLEDGE TRANSLATION, KNOWLEDGE EXCHANGE, AND EVIDENCE INTERMEDIARIES
In the health professions, the term knowledge translation (Graham et al., 2006;Grimshaw et al., 2012) is generally used to describe the role of knowledge translators (or brokers)--evidence intermediaries who link research producers and end users. Formally, knowledge translation is defined, for example, by the Canadian Institutes of Health Research (https://cihr-irsc.gc.ca/e/ 193.html) as a dynamic and iterative process that includes synthesis, dissemination, exchange, and ethically sound application of knowledge to improve health, provide more effective health services and products, and strengthen the health care system (Graham et al., 2006;Straus et al., 2009).
The origins of knowledge translation can be traced to informal networks linking academic researchers with the German dye (late 1800s) and agricultural industries (1906) (Lomas, 2007). The concept of knowledge translation in health emerged in the 1990s, when knowledge producers "pushed" their research messages onto end-users (Peprah, 2020). Clinical epidemiologists, clinicians who see patients and do research, are considered the first medical knowledge brokers from this period (i.e., early 1990s) (Lomas 2007). Although the practice of knowledge Experience-based information sources, such as personal experience and direct exchange with colleagues and experts, are more important than evidence-based sources, such as guidelines, specialized journals, and textbooks targeted to professionals. Articles from international scientific journals are hardly ever consulted.
accessibility of the evidence; practitioner time to find and read evidence; relevance and applicability of the evidence *Major barriers to using scientific evidence were categorized according to the typology developed by Walsh et al. (2019). translation in health has recently expanded to more organizations and health professions, knowledge translators typically do the translation (synthesis), making first contact with practitioners and disseminating information to them (Lomas 2007). It is not often the other way around (i.e., practitioners initially engage with or seek out knowledge translators).
In conservation and environmental science, the similar concept of knowledge exchange has gained prominence. Fazey et al. (2012) define it as "processes that generate, share, and/or use knowledge through various methods appropriate to the context, purpose, and participants involved." Boundary organizations or spanners, bridging organizations, and knowledge brokers are all related FIGURE 1 Conceptualization of evidence bridges who identify research topics based on input from practitioners and facilitate the translation of research into conservation practice (e.g., forest management, sustainable fishing, water management, etc.) terms that are commonly applied but have varied meanings. As in medicine, the evidence intermediaries in conservation aim to enable effective knowledge exchange. However, conservation intermediaries (as opposed to those in medicine) are more varied and ill-defined (Bednarek et al., 2018;Crona & Parker, 2012;Gustafsson & Lidskog 2018) and, we argue, insufficient in number and underdeveloped in role and function for translating research into practice.

KEY ROLES AND PROPERTIES OF EVIDENCE BRIDGES
Evidence bridges are knowledge brokers Farwig et al., 2017;Meyer, 2010) who facilitate the exchange of knowledge between and among researchers and practitioners (Figure 1). A set of key roles and properties for effective evidence bridges based on our review of evidence bridges in medicine and the knowledge broker literature is in Table 2.
Effective evidence bridges interact with primary researchers and practitioners and seek wide recognition and respect in the relevant practitioner communities. They provide existing evidence in easy-to-find and easy-to-use formats for practitioners. These include concise, targeted, and relevant tools, algorithms, synopses, and guidelines that address a wide range of practitioner-directed conservation goals, from local concerns (e.g., managing a wetland) to national or global issues (e.g., halting bird population declines, reducing pesticide use, or developing sustainable fisheries). They also consult practitioners regularly regarding their evidence needs and in doing so inform future research. They operate as a third party, independent of financial or other interests of researchers and decision-makers that could affect objective evidence synthesis and communication.
Evidence bridges are professional individuals or organizations with a mandate to act as intermediaries between science and practice (i.e., they support decisions of conservation practitioners regarding their actions). We distinguish evidence bridges from boundary spanners, who focus primarily on the sciencepolicy interface, often as mediators in disputes, posing potential solutions, and deciding on courses of action (Bednarek et al., 2018;Cash, 2001;Cash et al., 2003;Guston, 1999;Guston, 2001;Posner & Cvitanovic, 2019;Safford et al., 2017). We also distinguish evidence bridges from bridging organizations, which, like boundary spanners provide mediation, but also emphasize knowledge coproduction and comanagement and adaptive governance of resources (Berkes, 2009;Crona & Parker, 2012). In our view, evidence bridges do not negotiate between parties or resolve conflicts; dictate or recommend a particular course of action; or act as conservation advocates.
As in medicine, a conservation evidence bridge should synthesize evidence and collaborate with practitioners to identify their needs and translate science accordingly. Segan et al. (2011) note regarding the medical equivalents, "In addition to the organizations that compile reviews of evidence (e.g., Clinical Evidence, Cochrane Library [https://www.cochrane.org/]), a second set of institutions in medicine… are responsible for synthesizing information for decision making. These institutions consider the effectiveness of a given intervention and other factors that might affect investment in the intervention, such as its cost, availability of alternative interventions to achieve the same objective, and effect on the patient and society of not acting." It is this second set of institutions (or individuals) that is needed in conservation to supplement and complement the work of organizations that compile and review environmental Produce or assemble evidence summaries and tools that are practitioner-focused: directly useable by practitioners when making decisions on the ground (4,5,7) Update evidence summaries and tools regularly from the current state of knowledge (4) Produce or assemble evidence summaries and tools that are primarily noncommissioned and therefore independent of economic or other interests that may affect or reasonably be perceived to affect objectivity and independence (8) Produces evidence syntheses that are primarily non-commissioned, avoiding or restricting economic or other interests that may affect objectivity and independence Produce or assemble evidence summaries and tools that address a wide range of research topics that are based on the priorities of practitioners rather than those of the scientific community (7,9)

Disseminating evidence
Distribute evidence syntheses through face-to-face exchanges (12) Distributes evidence syntheses through face-to-face exchanges Distribute easy-to-find and easy-to-use evidence syntheses to practitioners (7,12,14) Distributes easy-to-find and easy-to-use evidence syntheses to practitioners

Networking
Develop and maintain networks of connections among and between researchers and practitioners, developing a mutual understanding of goals and cultures (3,5,6,7"13,14,17)

Develops and maintains networks of connections among and between researchers and practitioners
Consult practitioners regularly regarding their evidence needs and in doing so inform future research (5,7) Identify and communicate practitioner needs (based on the priorities of practitioners) for which research solutions are required to the research community (4,5,7) Build trust with a broad base of both research and practitioner communities to make evidence visible and widely sought (5,13,17) Promote a culture that values the use of the best available evidence in practice (2,3,5,13)

Operations
Operate as a neutral third party, independent of financial interests from researchers and decision-makers (2,15) Produces evidence syntheses that are primarily non-commissioned, avoiding or restricting economic or other interests that may affect objectivity and evidence, such as Conservation Evidence (CE) (https://www. conservationevidence.com/) and Collaboration for Environmental Evidence (CEE) (https://www.environmentalevidence. org/). Organizations like CE and CEE partially fulfill the role of evidence bridges in conservation but by themselves cannot be considered fully formed evidence bridges. Evidence bridges may either synthesize evidence independently or use syntheses from other organizations, but their essential role is to convert syntheses into timely and useable information for practitioners. This process is an effective way to translate knowledge (Elueze, 2015;Lomas, 2007;Traynor et al., 2014) to promote uptake of evidence (Nguyen et al., 2017). This process encourages practitioners to make decisions openly and transparently and primary researchers to produce practice-relevant (i.e., applied) evidence. Medical evidence bridges produce need assessments and write evidence-based clinical practice guidelines and summaries of empirical evidence. They develop and implement knowledge translation plans and strategic communications and dissemination plans to reach practitioners. Their overall mandate is to summarize, translate, and disseminate relevant evidence clearly and concisely to medical practitioners (Dicks et al., 2014;Haynes, 2001). The evidence is available in a quickly digestible form, minimizing the need for practitioners to hunt down evidence, thus increasing the likelihood that they will find and use it. Although medical practitioners may also struggle with the need for suitable evidence summaries (e.g., Bensing, 2000;Kahn et al., 2011;Scutchfield & Lamberth, 2010), we argue the gap in conservation is much greater.

CONTRASTING EVIDENCE BRIDGES WITH ORGANIZATIONS THAT SYNTHESIZE CONSERVATION EVIDENCE
We contrasted evidence bridges with 2 existing organizations that compile and review conservation evidence. The CEE publishes systematic reviews, systematic maps, and meta-analyses. These syntheses are generally either commissioned or driven by scientists. In contrast, an evidence bridge would synthesize research on topics selected through broad-based consultation with a community of practitioners. In medicine, commissioned syntheses are the exception, and stakeholders help to define review questions. There is little evidence regarding the use of CEE by conservation practitioners. Few systematic reviews in conservation and environmental management contain conclusions that would be considered practical for on-theground management interventions (Cook et al., 2013b). In contrast, one of the primary medical intermediaries, Cochrane, has over 10,000 members and 31,000 contributors, including health care professionals and patients from over 130 countries (Cassels, 2013;Cochrane Library, 2020;von Elm et al., 2013).
Conservation Evidence maintains a growing database of "subject-wide evidence syntheses" (i.e., searchable synopses [Sutherland & Wordley, 2018]) that has been integrated into several practitioner-focused resources and decision-support tools by "evidence champions" (Sutherland et al., 2019), such as the IUCN Red List, the National Biodiversity Network, and Conservation Management System software [CMSi]. However, as with CEE, CE does not select topics based on consultation with practitioners and currently lacks evidence of its effectiveness . At present, the only study documenting its use by practitioners indicates that it influenced choices of management in favor of more effective interventions (Walsh et al., 2015).
These conservation evidence organizations do an excellent job of synthesizing and summarizing information. But they only partially fulfill the role of evidence bridges in conservation (Appendix S6). They could broaden their roles as fully formed evidence bridges by increasing engagement with practitioners to source synthesis topics and delivering targeted synthesis products to practitioners. This would likely involve partnering with, hiring, or establishing dedicated knowledge brokers.

ORGANIZATIONS THAT PARTIALLY FILL THE ROLE OF EVIDENCE BRIDGES
We found few organizations that might meet all the criteria (Appendix S6) for evidence bridges in conservation (Table 2). In this search, we reviewed literature on evidence intermediaries in conservation (Appendix S3). We also shared an anonymous questionnaire on Twitter in July-August 2020, which was seen 5780 times and had 193 interactions (Appendix S4). Some organizations synthesize evidence but do not generally source topics from practitioners or distribute syntheses through direct exchanges with practitioners (e.g., CEE and CE). Other organizations work with practitioners but do not produce practitionerfocused evidence syntheses and tools (e.g., National Environmental Science Program Threatened Species Recovery Hub [https://www.nespthreatenedspecies.edu.au/]). Some evidence bridging work is contributing to conservation efforts, but it is unrecognized, often unplanned (Meyer, 2010), and only reaches a limited set of practitioners. Our review confirmed observations of other authors that the infrastructure that fully bridges evidence from researchers to practitioners still needs substantial development in conservation (Dicks et al., 2014;Farwig et al., 2017;Segan et al., 2011).
It was outside of the scope of this review to describe every organization in conservation and environmental management for its evidence-bridging capacity and acknowledge that there is a growing recognition of the need and increasing inhouse capacity for synthesis work within government agencies. For example, Parks Canada (https://www.pc.gc.ca/en/index) (Government of Canada) recently established a knowledge mobilization group, which we identified through personal contacts and which we would likely not have been aware had we not been Canadian (personal communication). Nevertheless, based on our review, we conclude that actual evidence bridges are generally very difficult to find in conservation, suggesting that their number is currently insufficient to form a readily accessible broad-based resource for conservation practitioners.
Despite this, we found 4 organizations that fulfill the criteria for evidence bridges (FRI Research [https://friresearch.ca/], Electric Power Research Institute [https://www.epri.com/], National Council for Air and Stream Improvement [NCASI] [https://www.ncasi.org/], and Rights-of-Way as Habitat Working Group [http://rightofway.erc.uic.edu/]) that provide examples of how evidence bridges can influence conservation practice. For example, NCASI identifies and prioritizes environmental issues related to forest products based on input from industry advisory panels. Individuals within NCASI synthesize forestry science results for practitioners in the forest-product sector. Their successes in fostering use of evidence in practice, and the successes of the other organizations in Appendix S6, provide a model for evidence bridges in other sectors (Appendix S5).

LIMITATIONS IN THE ROLES OF RESEARCHERS AND PRACTITIONERS
Neither primary researchers nor practitioners are well equipped to form evidence bridges themselves because of their different roles, skill sets, incentives, and constraints. Several authors argue that conservation researchers themselves should build evidence bridges to conservation practitioners (e.g., Arlettaz et al., 2010;Fabian et al., 2019;Laurance et al., 2012;Pullin & Knight, 2012;Rose, 2015) and even have an ethical responsibility to do so (Lacey et al., 2015). They argue that if researchers would communicate their work in user-friendly ways, it would be more readily taken up and used by practitioners. Although we agree this can succeed in specific situations, it is not a general solution to the overall goal of improving the use of evidence in conservation decisions. Primary researchers are specialists in conducting research and publishing in the peer-reviewed scientific literature. They generally lack strong links with practitioners who could use their work. Relying on primary researchers to build evidence bridges is problematic because the varying incentives provided by potential funding opportunities, citation rates, and media scores, such as Altmetric, make it difficult for individual researchers to provide independent and unbiased syntheses of the evidence (Martinson et al., 2009). We suggest that evidence bridges would help "relieve scientists from a task which they are not trained for and which they may be reluctant to do" (Farwig et al., 2017).
It is equally unrealistic to expect practitioners to form evidence bridges by seeking out and synthesizing the evidence needed for their particular problem. Conservation practitioners are highly diverse, ranging from individual landowners, to industrial employees, to government managers, with widely varying needs and skill sets. They are highly constrained by funding and especially by time (Cvitanovic et al., 2014;Nguyen et al., 2018;Pullin & Knight 2005;Walsh et al., 2015). Moreover, the conservation literature is vast. Few practitioners have the training or the time to distill the relevant and scientifically credible information they need. In many cases, practitioners feel overloaded by information, without the means to synthesize it into coherent evidence (e.g., Girling & Gibbs 2019;Safford et al., 2017). Nakagawa et al. (2020) stated, "it has been nearly impossible to keep up with the deluge of information made available to support…our daily decisions." Evidence bridges would screen, evaluate, translate, and convey the existing science, thus allowing practitioners to use evidence rather than ignoring it because it is confusing (Table 1). Evidence bridges would also add value by facilitating interactions between practitioners and researchers.

ROLE OF VALUES IN CONSERVATION DECISIONS
Conservation decisions usually involve multiple players with multiple competing objectives and values, which affect and may override the use of evidence, especially if it is hard to find. Values are, therefore, a fundamental component of conservation decision making, influencing conservation effectiveness (Buschke et al., 2019;Johnson et al., 2015;Toomey et al., 2017). Practitioners may also apply their own tacit knowledge, based on their intuition or experience, when making decisions (Table 1) (Hulme, 2014;Roux et al., 2006). Basing decisions exclusively on values or tacit knowledge can lead to conflict (examples in Redpath et al. [2013]) and biased and inappropriate decisions (Dicks et al., 2014). However, decisions that do not account for values may uphold "a perception of the disconnected ivory tower of science" (Rose, 2018).
Evidence bridges can help navigate this challenge because they engage with practitioners. As a result, they are aware of the values influencing decisions. A key benefit of evidence bridges, like boundary organizations, is then their capacity to cross the divide between evidence and values (Guston, 1999). This can also happen in some specific situations where practitioners and scientists work directly together. For example, scientists and land managers incorporated evidence and values to determine the most effective method for restoring habitat for flatwood salamanders (Ambystoma cingulatum) in Florida (O'Donnell et al., 2017). However, this is the exception in conservation decision making (Table 1). Evidence bridges would help build relationships between conservation practitioners and researchers systematically.

MODEL FOR CREATING EVIDENCE BRIDGES IN CONSERVATION
In medicine, "where evidence-based clinical practice is now routine" (Dicks et al., 2014), evidence bridges include not only government health departments but also independent regulatory bodies (e.  (Lomas, 2007).
Medicine is a much larger (and older) field than conservation and much more heavily funded. In medicine, some evidence bridges are charitable organizations (e.g., Cochrane), and some are funded by governments either within government agencies (e.g., Canadian Institutes of Health Research, Agency for Healthcare Research and Quality [https://www.ahrq.gov/]) or at arm's length (e.g., Centre for Effective Practice [https: //cep.health/]). The latter organizations may also be partly privately funded. Some are housed at a university (e.g., Machealth [https://machealth.ca/]). In some cases, the practitioners using the evidence pay the evidence bridge for access via membership fees or dues (e.g., UpToDate [https://www.uptodate. com/home], Lexicomp [https://www.wolterskluwercdi.com/ lexicomp-online/]).
In principle, all these funding sources could also be used for evidence bridges in conservation. One funding source that creates particular challenges in medicine is industry funding, such as from pharmaceutical companies. This compromises objectivity in evidence synthesis and therefore the ability of the evidence bridge to perform its central role of providing the best, most up-to-date evidence to practitioners. In conservation, a similar challenge would arise if, for example, substantial funding for an evidence bridge were obtained from natural resource extraction industries. Thus, funding sources that compromise independence and transparency should be avoided or restricted.
Given the diversity of different issues faced in conservation, and the lack of dedicated funding, a single evidence-bridging organization for all conservation decision making will not be practical. One approach to build consistency in evidence bridges would be to develop a college for conservation decision making modeled after the College of Physicians and Surgeons. Such a college could bring together and form a clearinghouse for conservation evidence bridges. There are several ways to develop such a college, potentially based on an existing organization. For example, the CEE could be a good starting point for such a professional community (Posner & Cvitanovic, 2019) of conservation evidence bridges. It already has a distributed set of centers (Lomas et al., 2007). A natural extension would be to extend its evidence synthesis activities to include evidence-bridging activities. Each center could reach out to a broad segment of conservation practitioners, and the organizations with whom they network, to identify research topics most in need of evidence synthesis. Evidence bridges within the college could adopt synthesis standards developed by CEE, as well as communication and delivery standards. Certification could be used to ensure quality of evidence bridges in meeting practitioner needs in evidence synthesis (Farwig et al., 2017).
A college for conservation decision making could track which practitioners need evidence regarding which issues and which evidence bridges are synthesizing evidence for which broad issues. A college for conservation decision making could then direct practitioners to evidence bridges and direct evidence bridges to groups of practitioners in need of evidence. For example, a practitioner within the forest-product sector could contact the evidence college and then be directed to an evidence bridge such as NCASI. The college would also serve to identify common evidence gaps across evidence bridges to avoid repetition and redundancy.

CONCLUSION
We argue that full evidence bridges from research to practice are lacking and sorely needed in conservation. Such evidence bridges need to interact with practitioners to determine evidence needs and provide summarized, up-to-date, highly visible, and accessible evidence directly to practitioners for onthe-ground decision making. Several organizations help reduce the gap between evidence and practice and could serve as a platform for building additional components of evidence bridges in conservation. Evidence bridges require expertise in research and evidence synthesis but also expertise in communicating with conservation practitioners in need of evidence. We believe that professional societies, such as the Society for Conservation Biology (https://conbio.org/), Ecological Society of America (https://www.esa.org/), and British Ecological Society (https://www.britishecologicalsociety.org/), have an opportunity to play a leadership role in identifying and encouraging development of an appropriate model, such as a college for conservation decision making, to fill this gap.