Darling River Hardyhead Predicted Distribution in Hunter River Catchment NSW 2015

## **Abstract** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\n\n\nThe predicted current distribution of Darling River Hardyhead (Craterocephalus amniculus) in the Hunter River catchment, NSW. All available records of the species were collated and assessed for accuracy. For current distribution, only records after 1 January 1994 were used. Within the framework of the Australian Hydrological Geospatial Fabric V2 surface hydrology network, the records were associated with attributes from the National Environmental Stream Attributes Database. Modelling the current geographic distribution of each listed threatened freshwater aquatic species or population was undertaken using MaxEnt 3.3.3; a widely used species distribution modelling program that utilises presence records to generate probabilities of occurrence based on a suite of environmental variables quantified across the area of interest.\n\n## **Dataset History** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\n\n\nThe Darling River Hardyhead (Craterocephalus amniculus)is a small-bodied native fish that occurs in the upper tributaries of the Darling River near the Queensland-New South Wales border. A small population also occurs in the Hunter River catchment.TheHunterRiver catchment population is endangered- http://www.dpi.nsw.gov.au/fisheries/species-protection/conservation/what-current/endangered-populations/darling-river-hardyhead.The methods used to create the predicted current distribution of Darling River Hardyhead (Craterocephalus amniculus) are described fully in: NSW Department of Primary Industries (2015), NSW Fish Community Status 2015 - Final Report.\n\n\n\nThe predicted current distribution ofDarling River Hardyhead (Craterocephalus amniculus) in the HunterRiver catchment,NSW. All available records of the species were collated and assessed for accuracy. For current distribution, only records after 1 January 1994 were used. Within the framework of the Australian Hydrological Geospatial Fabric V2 surface hydrology network, the records were associated with attributes from the National Environmental Stream Attributes Database.Modelling the current geographic distribution of each listed threatened freshwater aquatic species or population was undertaken using MaxEnt 3.3.3; a widely used species distribution modelling program that utilises presence records to generate probabilities of occurrence based on a suite of environmental variables quantified across the area of interest.\n\n\n\nThe Australian Hydrological Geospatial Fabric V2 surface hydrology network (Geofabric) is a fully connected and directed stream network based a 9 second DEM. It allocates a unique stream segment number to each river reach in Australia. The Environmental Attributes Database is a set of lookup tables supplying attributes describing the natural and anthropogenic characteristics of the stream and catchment environment that was developed by the Australian National University (ANU) in 2011 and updated in 2012. The data is supplied as part of the supplementary Geofabric products which is associated with the 9 second DEM derived streams and the National Catchment Boundaries based on 250k scale stream network. 30 Stream variables were assessed for the modelling.\n\n\n\nMaxEnt 3.3.3 is a widely used species distribution modelling program that utilises presence records to generate probabilities of occurrence based on a suite of environmental variables quantified across the area of interest. It was used to model the current geographic distribution of each listed threatened freshwater aquatic species or population. We utilised logistic output to plot the predicted distribution of each species. This output equates to a probability that the species will be observed in each river reach, given the environmental conditions that exist there relative to the environmental conditions where the species is known to occur. For this mapping, above 33% probability was considered predicted presence. In addition, predicted separate populations were connected by manual interpretation. The predicted values for each river reach were converted from the Geofabric framework to the higher resolution 2013 NSW Strahler Stream Order Hydroline.\n\n## **Dataset Citation** \n\nNSW Department of Primary Industries (2015) Darling River Hardyhead Predicted Distribution in Hunter River Catchment NSW 2015. Bioregional Assessment Source Dataset. Viewed 13 March 2019, http://data.bioregionalassessments.gov.au/dataset/643c6228-6435-4f5a-9f09-5f53efe234d2.

**摘要**

本数据集及其元数据声明由第三方提供给生物区域评估计划（Bioregional Assessment Programme），并按原始提供的形式在此呈现。

新南威尔士州亨特河流域内达令河硬头鱼（Darling River Hardyhead，Craterocephalus amniculus）的当前潜在分布预测。研究人员整理了该物种的所有可用记录并对其准确性进行评估。针对当前分布的分析，仅采用1994年1月1日之后的记录。在澳大利亚水文地理空间织物V2（Australian Hydrological Geospatial Fabric V2）地表水文网络框架下，将记录与国家河流环境属性数据库（National Environmental Stream Attributes Database）的属性进行关联。针对每一种列入保护名录的濒危淡水水生物种或种群，采用MaxEnt 3.3.3开展当前地理分布建模；该工具是一款广泛使用的物种分布建模程序，通过利用物种出现记录，基于研究区域内量化的一系列环境变量生成物种出现概率。

## **数据集历史**

本数据集及其元数据声明由第三方提供给生物区域评估计划，并按原始提供的形式在此呈现。

达令河硬头鱼（Craterocephalus amniculus）是一种小型本土鱼类，分布于达令河靠近昆士兰州-新南威尔士州边界的上游支流。另有一小种群栖息于亨特河流域。该亨特河流域种群已被列为濒危物种，详见：http://www.dpi.nsw.gov.au/fisheries/species-protection/conservation/what-current/endangered-populations/darling-river-hardyhead。用于构建达令河硬头鱼当前潜在分布预测的方法已在以下文献中详细说明：新南威尔士州初级产业部（2015），《2015年新南威尔士州鱼类群落现状——最终报告》。

新南威尔士州亨特河流域内达令河硬头鱼的当前潜在分布预测。研究人员整理了该物种的所有可用记录并对其准确性进行评估。针对当前分布的分析，仅采用1994年1月1日之后的记录。在澳大利亚水文地理空间织物V2地表水文网络框架下，将记录与国家河流环境属性数据库的属性进行关联。针对每一种列入保护名录的濒危淡水水生物种或种群，采用MaxEnt 3.3.3开展当前地理分布建模；该工具是一款广泛使用的物种分布建模程序，通过利用物种出现记录，基于研究区域内量化的一系列环境变量生成物种出现概率。

澳大利亚水文地理空间织物V2地表水文网络（Geofabric）是基于9秒分辨率数字高程模型（Digital Elevation Model, DEM）构建的全连通有向河网，为澳大利亚内的每一个河段分配唯一的河段编号。国家河流环境属性数据库是一套查找表，用于描述河流与流域环境的自然及人为特征，由澳大利亚国立大学（Australian National University, ANU）于2011年开发并于2012年更新。该数据作为补充性Geofabric产品的一部分提供，配套基于9秒DEM生成的河网以及基于25万比例尺河网绘制的国家流域边界。本次建模共评估了30个河流变量。

MaxEnt 3.3.3是一款广泛使用的物种分布建模程序，通过利用物种出现记录，基于研究区域内量化的一系列环境变量生成物种出现概率。本次研究采用该工具对每一种列入保护名录的濒危淡水水生物种或种群的当前地理分布进行建模。我们使用逻辑回归输出结果来绘制各物种的潜在分布，该输出结果对应于：在某一河段的环境条件相对于该物种已知出现地的环境条件的前提下，该河段观测到该物种的概率。本次制图中，概率高于33%的河段被视为潜在适生区。此外，通过人工解译将预测得到的孤立种群进行连接。将Geofabric框架下的各河段预测值转换为更高分辨率的2013年新南威尔士州斯特拉勒河级序水系线图层。

## **数据集引用**

新南威尔士州初级产业部（2015）：《新南威尔士州亨特河流域达令河硬头鱼潜在分布预测 2015》，生物区域评估源数据集。2019年3月13日查阅，http://data.bioregionalassessments.gov.au/dataset/643c6228-6435-4f5a-9f09-5f53efe234d2。